src/third_party/WebKit/Source/core/page/EventHandler.cpp

   1 /*
   2  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
   3  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
   4  * Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  16  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  18  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  19  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  22  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  23  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  25  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include "config.h"
  29 #include "core/page/EventHandler.h"
  30
  31 #include "bindings/core/v8/ExceptionStatePlaceholder.h"
  32 #include "core/HTMLNames.h"
  33 #include "core/InputTypeNames.h"
  34 #include "core/SVGNames.h"
  35 #include "core/clipboard/DataObject.h"
  36 #include "core/clipboard/DataTransfer.h"
  37 #include "core/dom/Document.h"
  38 #include "core/dom/DocumentMarkerController.h"
  39 #include "core/dom/Fullscreen.h"
  40 #include "core/dom/NodeRenderingTraversal.h"
  41 #include "core/dom/TouchList.h"
  42 #include "core/dom/shadow/ShadowRoot.h"
  43 #include "core/editing/Editor.h"
  44 #include "core/editing/FrameSelection.h"
  45 #include "core/editing/TextIterator.h"
  46 #include "core/editing/htmlediting.h"
  47 #include "core/events/DOMWindowEventQueue.h"
  48 #include "core/events/EventPath.h"
  49 #include "core/events/KeyboardEvent.h"
  50 #include "core/events/MouseEvent.h"
  51 #include "core/events/TextEvent.h"
  52 #include "core/events/TouchEvent.h"
  53 #include "core/events/WheelEvent.h"
  54 #include "core/fetch/ImageResource.h"
  55 #include "core/frame/EventHandlerRegistry.h"
  56 #include "core/frame/FrameView.h"
  57 #include "core/frame/LocalFrame.h"
  58 #include "core/frame/Settings.h"
  59 #include "core/html/HTMLDialogElement.h"
  60 #include "core/html/HTMLFrameElementBase.h"
  61 #include "core/html/HTMLFrameSetElement.h"
  62 #include "core/html/HTMLInputElement.h"
  63 #include "core/inspector/InspectorController.h"
  64 #include "core/loader/FrameLoader.h"
  65 #include "core/loader/FrameLoaderClient.h"
  66 #include "core/page/AutoscrollController.h"
  67 #include "core/page/BackForwardClient.h"
  68 #include "core/page/Chrome.h"
  69 #include "core/page/ChromeClient.h"
  70 #include "core/page/DragController.h"
  71 #include "core/page/DragState.h"
  72 #include "core/page/EditorClient.h"
  73 #include "core/page/FocusController.h"
  74 #include "core/page/FrameTree.h"
  75 #include "core/page/Page.h"
  76 #include "core/page/SpatialNavigation.h"
  77 #include "core/page/TouchAdjustment.h"
  78 #include "core/rendering/HitTestRequest.h"
  79 #include "core/rendering/HitTestResult.h"
  80 #include "core/rendering/RenderFlowThread.h"
  81 #include "core/rendering/RenderLayer.h"
  82 #include "core/rendering/RenderTextControlSingleLine.h"
  83 #include "core/rendering/RenderView.h"
  84 #include "core/rendering/RenderWidget.h"
  85 #include "core/rendering/style/RenderStyle.h"
  86 #include "core/svg/SVGDocumentExtensions.h"
  87 #include "platform/PlatformGestureEvent.h"
  88 #include "platform/PlatformKeyboardEvent.h"
  89 #include "platform/PlatformTouchEvent.h"
  90 #include "platform/PlatformWheelEvent.h"
  91 #include "platform/RuntimeEnabledFeatures.h"
  92 #include "platform/TraceEvent.h"
  93 #include "platform/WindowsKeyboardCodes.h"
  94 #include "platform/geometry/FloatPoint.h"
  95 #include "platform/graphics/Image.h"
  96 #include "platform/heap/Handle.h"
  97 #include "platform/scroll/ScrollAnimator.h"
  98 #include "platform/scroll/Scrollbar.h"
  99 #include "wtf/Assertions.h"
 100 #include "wtf/CurrentTime.h"
 101 #include "wtf/StdLibExtras.h"
 102 #include "wtf/TemporaryChange.h"
 103
 104 namespace blink {
 105
 106 using namespace HTMLNames;
 107
 108 // The link drag hysteresis is much larger than the others because there
 109 // needs to be enough space to cancel the link press without starting a link drag,
 110 // and because dragging links is rare.
 111 static const int LinkDragHysteresis = 40;
 112 static const int ImageDragHysteresis = 5;
 113 static const int TextDragHysteresis = 3;
 114 static const int GeneralDragHysteresis = 3;
 115
 116 // The amount of time to wait before sending a fake mouse event, triggered
 117 // during a scroll. The short interval is used if the content responds to the mouse events quickly enough,
 118 // otherwise the long interval is used.
 119 static const double fakeMouseMoveShortInterval = 0.1;
 120 static const double fakeMouseMoveLongInterval = 0.250;
 121
 122 // The amount of time to wait for a cursor update on style and layout changes
 123 // Set to 50Hz, no need to be faster than common screen refresh rate
 124 static const double cursorUpdateInterval = 0.02;
 125
 126 static const int maximumCursorSize = 128;
 127
 128 // It's pretty unlikely that a scale of less than one would ever be used. But all we really
 129 // need to ensure here is that the scale isn't so small that integer overflow can occur when
 130 // dividing cursor sizes (limited above) by the scale.
 131 static const double minimumCursorScale = 0.001;
 132
 133 // The minimum amount of time an element stays active after a ShowPress
 134 // This is roughly 9 frames, which should be long enough to be noticeable.
 135 static const double minimumActiveInterval = 0.15;
 136
 137 #if OS(MACOSX)
 138 static const double TextDragDelay = 0.15;
 139 #else
 140 static const double TextDragDelay = 0.0;
 141 #endif
 142
 143 enum NoCursorChangeType { NoCursorChange };
 144
 145 class OptionalCursor {
 146 public:
 147     OptionalCursor(NoCursorChangeType) : m_isCursorChange(false) { }
 148     OptionalCursor(const Cursor& cursor) : m_isCursorChange(true), m_cursor(cursor) { }
 149
 150     bool isCursorChange() const { return m_isCursorChange; }
 151     const Cursor& cursor() const { ASSERT(m_isCursorChange); return m_cursor; }
 152
 153 private:
 154     bool m_isCursorChange;
 155     Cursor m_cursor;
 156 };
 157
 158 class MaximumDurationTracker {
 159 public:
 160     explicit MaximumDurationTracker(double *maxDuration)
 161         : m_maxDuration(maxDuration)
 162         , m_start(monotonicallyIncreasingTime())
 163     {
 164     }
 165
 166     ~MaximumDurationTracker()
 167     {
 168         *m_maxDuration = max(*m_maxDuration, monotonicallyIncreasingTime() - m_start);
 169     }
 170
 171 private:
 172     double* m_maxDuration;
 173     double m_start;
 174 };
 175
 176 static inline ScrollGranularity wheelGranularityToScrollGranularity(unsigned deltaMode)
 177 {
 178     switch (deltaMode) {
 179     case WheelEvent::DOM_DELTA_PAGE:
 180         return ScrollByPage;
 181     case WheelEvent::DOM_DELTA_LINE:
 182         return ScrollByLine;
 183     case WheelEvent::DOM_DELTA_PIXEL:
 184         return ScrollByPixel;
 185     default:
 186         return ScrollByPixel;
 187     }
 188 }
 189
 190 // Refetch the event target node if it is removed or currently is the shadow node inside an <input> element.
 191 // If a mouse event handler changes the input element type to one that has a widget associated,
 192 // we'd like to EventHandler::handleMousePressEvent to pass the event to the widget and thus the
 193 // event target node can't still be the shadow node.
 194 static inline bool shouldRefetchEventTarget(const MouseEventWithHitTestResults& mev)
 195 {
 196     Node* targetNode = mev.innerNode();
 197     if (!targetNode || !targetNode->parentNode())
 198         return true;
 199     return targetNode->isShadowRoot() && isHTMLInputElement(*toShadowRoot(targetNode)->host());
 200 }
 201
 202 EventHandler::EventHandler(LocalFrame* frame)
 203     : m_frame(frame)
 204     , m_mousePressed(false)
 205     , m_capturesDragging(false)
 206     , m_mouseDownMayStartSelect(false)
 207     , m_mouseDownMayStartDrag(false)
 208     , m_mouseDownWasSingleClickInSelection(false)
 209     , m_selectionInitiationState(HaveNotStartedSelection)
 210     , m_hoverTimer(this, &EventHandler::hoverTimerFired)
 211     , m_cursorUpdateTimer(this, &EventHandler::cursorUpdateTimerFired)
 212     , m_mouseDownMayStartAutoscroll(false)
 213     , m_mouseDownWasInSubframe(false)
 214     , m_fakeMouseMoveEventTimer(this, &EventHandler::fakeMouseMoveEventTimerFired)
 215     , m_svgPan(false)
 216     , m_resizeScrollableArea(0)
 217     , m_eventHandlerWillResetCapturingMouseEventsNode(0)
 218     , m_clickCount(0)
 219     , m_shouldOnlyFireDragOverEvent(false)
 220     , m_mousePositionIsUnknown(true)
 221     , m_mouseDownTimestamp(0)
 222     , m_widgetIsLatched(false)
 223     , m_touchPressed(false)
 224     , m_scrollGestureHandlingNode(nullptr)
 225     , m_lastGestureScrollOverWidget(false)
 226     , m_maxMouseMovedDuration(0)
 227     , m_didStartDrag(false)
 228     , m_longTapShouldInvokeContextMenu(false)
 229     , m_activeIntervalTimer(this, &EventHandler::activeIntervalTimerFired)
 230     , m_lastShowPressTimestamp(0)
 231 {
 232 }
 233
 234 EventHandler::~EventHandler()
 235 {
 236     ASSERT(!m_fakeMouseMoveEventTimer.isActive());
 237 }
 238
 239 void EventHandler::trace(Visitor* visitor)
 240 {
 241 #if ENABLE(OILPAN)
 242     visitor->trace(m_mousePressNode);
 243     visitor->trace(m_capturingMouseEventsNode);
 244     visitor->trace(m_nodeUnderMouse);
 245     visitor->trace(m_lastNodeUnderMouse);
 246     visitor->trace(m_lastMouseMoveEventSubframe);
 247     visitor->trace(m_clickNode);
 248     visitor->trace(m_dragTarget);
 249     visitor->trace(m_frameSetBeingResized);
 250     visitor->trace(m_latchedWheelEventNode);
 251     visitor->trace(m_previousWheelScrolledNode);
 252     visitor->trace(m_targetForTouchID);
 253     visitor->trace(m_touchSequenceDocument);
 254     visitor->trace(m_scrollGestureHandlingNode);
 255     visitor->trace(m_previousGestureScrolledNode);
 256     visitor->trace(m_lastDeferredTapElement);
 257 #endif
 258 }
 259
 260 DragState& EventHandler::dragState()
 261 {
 262     DEFINE_STATIC_LOCAL(OwnPtrWillBePersistent<DragState>, state, (adoptPtrWillBeNoop(new DragState())));
 263     return *state;
 264 }
 265
 266 void EventHandler::clear()
 267 {
 268     m_hoverTimer.stop();
 269     m_cursorUpdateTimer.stop();
 270     m_fakeMouseMoveEventTimer.stop();
 271     m_activeIntervalTimer.stop();
 272     m_resizeScrollableArea = 0;
 273     m_nodeUnderMouse = nullptr;
 274     m_lastNodeUnderMouse = nullptr;
 275     m_lastMouseMoveEventSubframe = nullptr;
 276     m_lastScrollbarUnderMouse = nullptr;
 277     m_clickCount = 0;
 278     m_clickNode = nullptr;
 279     m_frameSetBeingResized = nullptr;
 280     m_dragTarget = nullptr;
 281     m_shouldOnlyFireDragOverEvent = false;
 282     m_mousePositionIsUnknown = true;
 283     m_lastKnownMousePosition = IntPoint();
 284     m_lastKnownMouseGlobalPosition = IntPoint();
 285     m_lastMouseDownUserGestureToken.clear();
 286     m_mousePressNode = nullptr;
 287     m_mousePressed = false;
 288     m_capturesDragging = false;
 289     m_capturingMouseEventsNode = nullptr;
 290     m_latchedWheelEventNode = nullptr;
 291     m_previousWheelScrolledNode = nullptr;
 292     m_targetForTouchID.clear();
 293     m_touchSequenceDocument.clear();
 294     m_touchSequenceUserGestureToken.clear();
 295     m_scrollGestureHandlingNode = nullptr;
 296     m_lastGestureScrollOverWidget = false;
 297     m_previousGestureScrolledNode = nullptr;
 298     m_scrollbarHandlingScrollGesture = nullptr;
 299     m_maxMouseMovedDuration = 0;
 300     m_didStartDrag = false;
 301     m_touchPressed = false;
 302     m_mouseDownMayStartSelect = false;
 303     m_mouseDownMayStartDrag = false;
 304     m_lastShowPressTimestamp = 0;
 305     m_lastDeferredTapElement = nullptr;
 306 }
 307
 308 void EventHandler::nodeWillBeRemoved(Node& nodeToBeRemoved)
 309 {
 310     if (!nodeToBeRemoved.containsIncludingShadowDOM(m_clickNode.get()))
 311         return;
 312     if (nodeToBeRemoved.isInShadowTree()) {
 313         m_clickNode = nodeToBeRemoved.parentOrShadowHostNode();
 314     } else {
 315         // We don't dispatch click events if the mousedown node is removed
 316         // before a mouseup event. It is compatible with IE and Firefox.
 317         m_clickNode = nullptr;
 318     }
 319 }
 320
 321 static void setSelectionIfNeeded(FrameSelection& selection, const VisibleSelection& newSelection)
 322 {
 323     if (selection.selection() != newSelection)
 324         selection.setSelection(newSelection);
 325 }
 326
 327 static inline bool dispatchSelectStart(Node* node)
 328 {
 329     if (!node || !node->renderer())
 330         return true;
 331
 332     return node->dispatchEvent(Event::createCancelableBubble(EventTypeNames::selectstart));
 333 }
 334
 335 static VisibleSelection expandSelectionToRespectUserSelectAll(Node* targetNode, const VisibleSelection& selection)
 336 {
 337     Node* rootUserSelectAll = Position::rootUserSelectAllForNode(targetNode);
 338     if (!rootUserSelectAll)
 339         return selection;
 340
 341     VisibleSelection newSelection(selection);
 342     newSelection.setBase(positionBeforeNode(rootUserSelectAll).upstream(CanCrossEditingBoundary));
 343     newSelection.setExtent(positionAfterNode(rootUserSelectAll).downstream(CanCrossEditingBoundary));
 344
 345     return newSelection;
 346 }
 347
 348 bool EventHandler::updateSelectionForMouseDownDispatchingSelectStart(Node* targetNode, const VisibleSelection& selection, TextGranularity granularity)
 349 {
 350     if (Position::nodeIsUserSelectNone(targetNode))
 351         return false;
 352
 353     if (!dispatchSelectStart(targetNode))
 354         return false;
 355
 356     if (selection.isRange())
 357         m_selectionInitiationState = ExtendedSelection;
 358     else {
 359         granularity = CharacterGranularity;
 360         m_selectionInitiationState = PlacedCaret;
 361     }
 362
 363     m_frame->selection().setNonDirectionalSelectionIfNeeded(selection, granularity);
 364
 365     return true;
 366 }
 367
 368 void EventHandler::selectClosestWordFromHitTestResult(const HitTestResult& result, AppendTrailingWhitespace appendTrailingWhitespace)
 369 {
 370     Node* innerNode = result.innerNode();
 371     VisibleSelection newSelection;
 372
 373     if (innerNode && innerNode->renderer()) {
 374         VisiblePosition pos(innerNode->renderer()->positionForPoint(result.localPoint()));
 375         if (pos.isNotNull()) {
 376             newSelection = VisibleSelection(pos);
 377             newSelection.expandUsingGranularity(WordGranularity);
 378         }
 379
 380         if (appendTrailingWhitespace == ShouldAppendTrailingWhitespace && newSelection.isRange())
 381             newSelection.appendTrailingWhitespace();
 382
 383         updateSelectionForMouseDownDispatchingSelectStart(innerNode, expandSelectionToRespectUserSelectAll(innerNode, newSelection), WordGranularity);
 384     }
 385 }
 386
 387 void EventHandler::selectClosestMisspellingFromHitTestResult(const HitTestResult& result, AppendTrailingWhitespace appendTrailingWhitespace)
 388 {
 389     Node* innerNode = result.innerNode();
 390     VisibleSelection newSelection;
 391
 392     if (innerNode && innerNode->renderer()) {
 393         VisiblePosition pos(innerNode->renderer()->positionForPoint(result.localPoint()));
 394         Position start = pos.deepEquivalent();
 395         Position end = pos.deepEquivalent();
 396         if (pos.isNotNull()) {
 397             DocumentMarkerVector markers = innerNode->document().markers().markersInRange(makeRange(pos, pos).get(), DocumentMarker::MisspellingMarkers());
 398             if (markers.size() == 1) {
 399                 start.moveToOffset(markers[0]->startOffset());
 400                 end.moveToOffset(markers[0]->endOffset());
 401                 newSelection = VisibleSelection(start, end);
 402             }
 403         }
 404
 405         if (appendTrailingWhitespace == ShouldAppendTrailingWhitespace && newSelection.isRange())
 406             newSelection.appendTrailingWhitespace();
 407
 408         updateSelectionForMouseDownDispatchingSelectStart(innerNode, expandSelectionToRespectUserSelectAll(innerNode, newSelection), WordGranularity);
 409     }
 410 }
 411
 412 void EventHandler::selectClosestWordFromMouseEvent(const MouseEventWithHitTestResults& result)
 413 {
 414     if (m_mouseDownMayStartSelect) {
 415         selectClosestWordFromHitTestResult(result.hitTestResult(),
 416             (result.event().clickCount() == 2 && m_frame->editor().isSelectTrailingWhitespaceEnabled()) ? ShouldAppendTrailingWhitespace : DontAppendTrailingWhitespace);
 417     }
 418 }
 419
 420 void EventHandler::selectClosestMisspellingFromMouseEvent(const MouseEventWithHitTestResults& result)
 421 {
 422     if (m_mouseDownMayStartSelect) {
 423         selectClosestMisspellingFromHitTestResult(result.hitTestResult(),
 424             (result.event().clickCount() == 2 && m_frame->editor().isSelectTrailingWhitespaceEnabled()) ? ShouldAppendTrailingWhitespace : DontAppendTrailingWhitespace);
 425     }
 426 }
 427
 428 void EventHandler::selectClosestWordOrLinkFromMouseEvent(const MouseEventWithHitTestResults& result)
 429 {
 430     if (!result.hitTestResult().isLiveLink())
 431         return selectClosestWordFromMouseEvent(result);
 432
 433     Node* innerNode = result.innerNode();
 434
 435     if (innerNode && innerNode->renderer() && m_mouseDownMayStartSelect) {
 436         VisibleSelection newSelection;
 437         Element* URLElement = result.hitTestResult().URLElement();
 438         VisiblePosition pos(innerNode->renderer()->positionForPoint(result.localPoint()));
 439         if (pos.isNotNull() && pos.deepEquivalent().deprecatedNode()->isDescendantOf(URLElement))
 440             newSelection = VisibleSelection::selectionFromContentsOfNode(URLElement);
 441
 442         updateSelectionForMouseDownDispatchingSelectStart(innerNode, expandSelectionToRespectUserSelectAll(innerNode, newSelection), WordGranularity);
 443     }
 444 }
 445
 446 bool EventHandler::handleMousePressEventDoubleClick(const MouseEventWithHitTestResults& event)
 447 {
 448     TRACE_EVENT0("blink", "EventHandler::handleMousePressEventDoubleClick");
 449
 450     if (event.event().button() != LeftButton)
 451         return false;
 452
 453     if (m_frame->selection().isRange()) {
 454         // A double-click when range is already selected
 455         // should not change the selection.  So, do not call
 456         // selectClosestWordFromMouseEvent, but do set
 457         // m_beganSelectingText to prevent handleMouseReleaseEvent
 458         // from setting caret selection.
 459         m_selectionInitiationState = ExtendedSelection;
 460     } else {
 461         selectClosestWordFromMouseEvent(event);
 462     }
 463     return true;
 464 }
 465
 466 bool EventHandler::handleMousePressEventTripleClick(const MouseEventWithHitTestResults& event)
 467 {
 468     TRACE_EVENT0("blink", "EventHandler::handleMousePressEventTripleClick");
 469
 470     if (event.event().button() != LeftButton)
 471         return false;
 472
 473     Node* innerNode = event.innerNode();
 474     if (!(innerNode && innerNode->renderer() && m_mouseDownMayStartSelect))
 475         return false;
 476
 477     VisibleSelection newSelection;
 478     VisiblePosition pos(innerNode->renderer()->positionForPoint(event.localPoint()));
 479     if (pos.isNotNull()) {
 480         newSelection = VisibleSelection(pos);
 481         newSelection.expandUsingGranularity(ParagraphGranularity);
 482     }
 483
 484     return updateSelectionForMouseDownDispatchingSelectStart(innerNode, expandSelectionToRespectUserSelectAll(innerNode, newSelection), ParagraphGranularity);
 485 }
 486
 487 static int textDistance(const Position& start, const Position& end)
 488 {
 489     RefPtrWillBeRawPtr<Range> range = Range::create(*start.document(), start, end);
 490     return TextIterator::rangeLength(range.get(), true);
 491 }
 492
 493 bool EventHandler::handleMousePressEventSingleClick(const MouseEventWithHitTestResults& event)
 494 {
 495     TRACE_EVENT0("blink", "EventHandler::handleMousePressEventSingleClick");
 496
 497     m_frame->document()->updateLayoutIgnorePendingStylesheets();
 498     Node* innerNode = event.innerNode();
 499     if (!(innerNode && innerNode->renderer() && m_mouseDownMayStartSelect))
 500         return false;
 501
 502     // Extend the selection if the Shift key is down, unless the click is in a link.
 503     bool extendSelection = event.event().shiftKey() && !event.isOverLink();
 504
 505     // Don't restart the selection when the mouse is pressed on an
 506     // existing selection so we can allow for text dragging.
 507     if (FrameView* view = m_frame->view()) {
 508         LayoutPoint vPoint = view->windowToContents(event.event().position());
 509         if (!extendSelection && m_frame->selection().contains(vPoint)) {
 510             m_mouseDownWasSingleClickInSelection = true;
 511             return false;
 512         }
 513     }
 514
 515     VisiblePosition visiblePos(innerNode->renderer()->positionForPoint(event.localPoint()));
 516     if (visiblePos.isNull())
 517         visiblePos = VisiblePosition(firstPositionInOrBeforeNode(innerNode), DOWNSTREAM);
 518     Position pos = visiblePos.deepEquivalent();
 519
 520     VisibleSelection newSelection = m_frame->selection().selection();
 521     TextGranularity granularity = CharacterGranularity;
 522
 523     if (extendSelection && newSelection.isCaretOrRange()) {
 524         VisibleSelection selectionInUserSelectAll(expandSelectionToRespectUserSelectAll(innerNode, VisibleSelection(VisiblePosition(pos))));
 525         if (selectionInUserSelectAll.isRange()) {
 526             if (comparePositions(selectionInUserSelectAll.start(), newSelection.start()) < 0)
 527                 pos = selectionInUserSelectAll.start();
 528             else if (comparePositions(newSelection.end(), selectionInUserSelectAll.end()) < 0)
 529                 pos = selectionInUserSelectAll.end();
 530         }
 531
 532         if (!m_frame->editor().behavior().shouldConsiderSelectionAsDirectional()) {
 533             if (pos.isNotNull()) {
 534                 // See <rdar://problem/3668157> REGRESSION (Mail): shift-click deselects when selection
 535                 // was created right-to-left
 536                 Position start = newSelection.start();
 537                 Position end = newSelection.end();
 538                 int distanceToStart = textDistance(start, pos);
 539                 int distanceToEnd = textDistance(pos, end);
 540                 if (distanceToStart <= distanceToEnd)
 541                     newSelection = VisibleSelection(end, pos);
 542                 else
 543                     newSelection = VisibleSelection(start, pos);
 544             }
 545         } else
 546             newSelection.setExtent(pos);
 547
 548         if (m_frame->selection().granularity() != CharacterGranularity) {
 549             granularity = m_frame->selection().granularity();
 550             newSelection.expandUsingGranularity(m_frame->selection().granularity());
 551         }
 552     } else {
 553         newSelection = expandSelectionToRespectUserSelectAll(innerNode, VisibleSelection(visiblePos));
 554     }
 555
 556     // Updating the selection is considered side-effect of the event and so it doesn't impact the handled state.
 557     updateSelectionForMouseDownDispatchingSelectStart(innerNode, newSelection, granularity);
 558     return false;
 559 }
 560
 561 static inline bool canMouseDownStartSelect(Node* node)
 562 {
 563     if (!node || !node->renderer())
 564         return true;
 565
 566     if (!node->canStartSelection())
 567         return false;
 568
 569     return true;
 570 }
 571
 572 bool EventHandler::handleMousePressEvent(const MouseEventWithHitTestResults& event)
 573 {
 574     TRACE_EVENT0("blink", "EventHandler::handleMousePressEvent");
 575
 576     // Reset drag state.
 577     dragState().m_dragSrc = nullptr;
 578
 579     cancelFakeMouseMoveEvent();
 580
 581     m_frame->document()->updateLayoutIgnorePendingStylesheets();
 582
 583     if (ScrollView* scrollView = m_frame->view()) {
 584         if (scrollView->isPointInScrollbarCorner(event.event().position()))
 585             return false;
 586     }
 587
 588     bool singleClick = event.event().clickCount() <= 1;
 589
 590     // If we got the event back, that must mean it wasn't prevented,
 591     // so it's allowed to start a drag or selection if it wasn't in a scrollbar.
 592     m_mouseDownMayStartSelect = canMouseDownStartSelect(event.innerNode()) && !event.scrollbar();
 593
 594     m_mouseDownMayStartDrag = singleClick;
 595
 596     m_mouseDownWasSingleClickInSelection = false;
 597
 598     m_mouseDown = event.event();
 599
 600     if (event.isOverWidget() && passWidgetMouseDownEventToWidget(event))
 601         return true;
 602
 603     if (m_frame->document()->isSVGDocument() && m_frame->document()->accessSVGExtensions().zoomAndPanEnabled()) {
 604         if (event.event().shiftKey() && singleClick) {
 605             m_svgPan = true;
 606             m_frame->document()->accessSVGExtensions().startPan(m_frame->view()->windowToContents(event.event().position()));
 607             return true;
 608         }
 609     }
 610
 611     // We don't do this at the start of mouse down handling,
 612     // because we don't want to do it until we know we didn't hit a widget.
 613     if (singleClick)
 614         focusDocumentView();
 615
 616     Node* innerNode = event.innerNode();
 617
 618     m_mousePressNode = innerNode;
 619     m_dragStartPos = event.event().position();
 620
 621     bool swallowEvent = false;
 622     m_mousePressed = true;
 623
 624     if (event.event().clickCount() == 2)
 625         swallowEvent = handleMousePressEventDoubleClick(event);
 626     else if (event.event().clickCount() >= 3)
 627         swallowEvent = handleMousePressEventTripleClick(event);
 628     else
 629         swallowEvent = handleMousePressEventSingleClick(event);
 630
 631     m_mouseDownMayStartAutoscroll = m_mouseDownMayStartSelect
 632         || (m_mousePressNode && m_mousePressNode->renderBox() && m_mousePressNode->renderBox()->canBeProgramaticallyScrolled());
 633
 634     return swallowEvent;
 635 }
 636
 637 bool EventHandler::handleMouseDraggedEvent(const MouseEventWithHitTestResults& event)
 638 {
 639     TRACE_EVENT0("blink", "EventHandler::handleMouseDraggedEvent");
 640
 641     if (!m_mousePressed)
 642         return false;
 643
 644     if (handleDrag(event, ShouldCheckDragHysteresis))
 645         return true;
 646
 647     Node* targetNode = event.innerNode();
 648     if (event.event().button() != LeftButton || !targetNode)
 649         return false;
 650
 651     RenderObject* renderer = targetNode->renderer();
 652     if (!renderer) {
 653         Node* parent = NodeRenderingTraversal::parent(targetNode);
 654         if (!parent)
 655             return false;
 656
 657         renderer = parent->renderer();
 658         if (!renderer || !renderer->isListBox())
 659             return false;
 660     }
 661
 662     m_mouseDownMayStartDrag = false;
 663
 664     if (m_mouseDownMayStartAutoscroll && !panScrollInProgress()) {
 665         if (AutoscrollController* controller = autoscrollController()) {
 666             controller->startAutoscrollForSelection(renderer);
 667             m_mouseDownMayStartAutoscroll = false;
 668         }
 669     }
 670
 671     if (m_selectionInitiationState != ExtendedSelection) {
 672         HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active);
 673         HitTestResult result(m_mouseDownPos);
 674         m_frame->document()->renderView()->hitTest(request, result);
 675
 676         updateSelectionForMouseDrag(result);
 677     }
 678     updateSelectionForMouseDrag(event.hitTestResult());
 679     return true;
 680 }
 681
 682 void EventHandler::updateSelectionForMouseDrag()
 683 {
 684     FrameView* view = m_frame->view();
 685     if (!view)
 686         return;
 687     RenderView* renderer = m_frame->contentRenderer();
 688     if (!renderer)
 689         return;
 690
 691     HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active | HitTestRequest::Move);
 692     HitTestResult result(view->windowToContents(m_lastKnownMousePosition));
 693     renderer->hitTest(request, result);
 694     updateSelectionForMouseDrag(result);
 695 }
 696
 697 void EventHandler::updateSelectionForMouseDrag(const HitTestResult& hitTestResult)
 698 {
 699     if (!m_mouseDownMayStartSelect)
 700         return;
 701
 702     Node* target = hitTestResult.innerNode();
 703     if (!target)
 704         return;
 705
 706     VisiblePosition targetPosition = m_frame->selection().selection().visiblePositionRespectingEditingBoundary(hitTestResult.localPoint(), target);
 707     // Don't modify the selection if we're not on a node.
 708     if (targetPosition.isNull())
 709         return;
 710
 711     // Restart the selection if this is the first mouse move. This work is usually
 712     // done in handleMousePressEvent, but not if the mouse press was on an existing selection.
 713     VisibleSelection newSelection = m_frame->selection().selection();
 714
 715     // Special case to limit selection to the containing block for SVG text.
 716     // FIXME: Isn't there a better non-SVG-specific way to do this?
 717     if (Node* selectionBaseNode = newSelection.base().deprecatedNode())
 718         if (RenderObject* selectionBaseRenderer = selectionBaseNode->renderer())
 719             if (selectionBaseRenderer->isSVGText())
 720                 if (target->renderer()->containingBlock() != selectionBaseRenderer->containingBlock())
 721                     return;
 722
 723     if (m_selectionInitiationState == HaveNotStartedSelection && !dispatchSelectStart(target))
 724         return;
 725
 726     if (m_selectionInitiationState != ExtendedSelection) {
 727         // Always extend selection here because it's caused by a mouse drag
 728         m_selectionInitiationState = ExtendedSelection;
 729         newSelection = VisibleSelection(targetPosition);
 730     }
 731
 732     if (RuntimeEnabledFeatures::userSelectAllEnabled()) {
 733         Node* rootUserSelectAllForMousePressNode = Position::rootUserSelectAllForNode(m_mousePressNode.get());
 734         if (rootUserSelectAllForMousePressNode && rootUserSelectAllForMousePressNode == Position::rootUserSelectAllForNode(target)) {
 735             newSelection.setBase(positionBeforeNode(rootUserSelectAllForMousePressNode).upstream(CanCrossEditingBoundary));
 736             newSelection.setExtent(positionAfterNode(rootUserSelectAllForMousePressNode).downstream(CanCrossEditingBoundary));
 737         } else {
 738             // Reset base for user select all when base is inside user-select-all area and extent < base.
 739             if (rootUserSelectAllForMousePressNode && comparePositions(target->renderer()->positionForPoint(hitTestResult.localPoint()), m_mousePressNode->renderer()->positionForPoint(m_dragStartPos)) < 0)
 740                 newSelection.setBase(positionAfterNode(rootUserSelectAllForMousePressNode).downstream(CanCrossEditingBoundary));
 741
 742             Node* rootUserSelectAllForTarget = Position::rootUserSelectAllForNode(target);
 743             if (rootUserSelectAllForTarget && m_mousePressNode->renderer() && comparePositions(target->renderer()->positionForPoint(hitTestResult.localPoint()), m_mousePressNode->renderer()->positionForPoint(m_dragStartPos)) < 0)
 744                 newSelection.setExtent(positionBeforeNode(rootUserSelectAllForTarget).upstream(CanCrossEditingBoundary));
 745             else if (rootUserSelectAllForTarget && m_mousePressNode->renderer())
 746                 newSelection.setExtent(positionAfterNode(rootUserSelectAllForTarget).downstream(CanCrossEditingBoundary));
 747             else
 748                 newSelection.setExtent(targetPosition);
 749         }
 750     } else {
 751         newSelection.setExtent(targetPosition);
 752     }
 753
 754     if (m_frame->selection().granularity() != CharacterGranularity)
 755         newSelection.expandUsingGranularity(m_frame->selection().granularity());
 756
 757     m_frame->selection().setNonDirectionalSelectionIfNeeded(newSelection, m_frame->selection().granularity(),
 758         FrameSelection::AdjustEndpointsAtBidiBoundary);
 759 }
 760
 761 bool EventHandler::handleMouseReleaseEvent(const MouseEventWithHitTestResults& event)
 762 {
 763     AutoscrollController* controller = autoscrollController();
 764     if (controller && controller->autoscrollInProgress())
 765         stopAutoscroll();
 766
 767     // Used to prevent mouseMoveEvent from initiating a drag before
 768     // the mouse is pressed again.
 769     m_mousePressed = false;
 770     m_capturesDragging = false;
 771     m_mouseDownMayStartDrag = false;
 772     m_mouseDownMayStartSelect = false;
 773     m_mouseDownMayStartAutoscroll = false;
 774     m_mouseDownWasInSubframe = false;
 775
 776     bool handled = false;
 777
 778     // Clear the selection if the mouse didn't move after the last mouse
 779     // press and it's not a context menu click.  We do this so when clicking
 780     // on the selection, the selection goes away.  However, if we are
 781     // editing, place the caret.
 782     if (m_mouseDownWasSingleClickInSelection && m_selectionInitiationState != ExtendedSelection
 783             && m_dragStartPos == event.event().position()
 784             && m_frame->selection().isRange()
 785             && event.event().button() != RightButton) {
 786         VisibleSelection newSelection;
 787         Node* node = event.innerNode();
 788         bool caretBrowsing = m_frame->settings() && m_frame->settings()->caretBrowsingEnabled();
 789         if (node && node->renderer() && (caretBrowsing || node->hasEditableStyle())) {
 790             VisiblePosition pos = VisiblePosition(node->renderer()->positionForPoint(event.localPoint()));
 791             newSelection = VisibleSelection(pos);
 792         }
 793
 794         setSelectionIfNeeded(m_frame->selection(), newSelection);
 795
 796         handled = true;
 797     }
 798
 799     m_frame->selection().notifyRendererOfSelectionChange(UserTriggered);
 800
 801     m_frame->selection().selectFrameElementInParentIfFullySelected();
 802
 803     if (event.event().button() == MiddleButton && !event.isOverLink()) {
 804         // Ignore handled, since we want to paste to where the caret was placed anyway.
 805         handled = handlePasteGlobalSelection(event.event()) || handled;
 806     }
 807
 808     return handled;
 809 }
 810
 811 #if OS(WIN)
 812
 813 void EventHandler::startPanScrolling(RenderObject* renderer)
 814 {
 815     if (!renderer->isBox())
 816         return;
 817     AutoscrollController* controller = autoscrollController();
 818     if (!controller)
 819         return;
 820     controller->startPanScrolling(toRenderBox(renderer), lastKnownMousePosition());
 821     invalidateClick();
 822 }
 823
 824 #endif // OS(WIN)
 825
 826 AutoscrollController* EventHandler::autoscrollController() const
 827 {
 828     if (Page* page = m_frame->page())
 829         return &page->autoscrollController();
 830     return 0;
 831 }
 832
 833 bool EventHandler::panScrollInProgress() const
 834 {
 835     return autoscrollController() && autoscrollController()->panScrollInProgress();
 836 }
 837
 838 HitTestResult EventHandler::hitTestResultAtPoint(const LayoutPoint& point, HitTestRequest::HitTestRequestType hitType, const LayoutSize& padding)
 839 {
 840     TRACE_EVENT0("blink", "EventHandler::hitTestResultAtPoint");
 841
 842     // We always send hitTestResultAtPoint to the main frame if we have one,
 843     // otherwise we might hit areas that are obscured by higher frames.
 844     if (m_frame->page()) {
 845         LocalFrame* mainFrame = m_frame->localFrameRoot();
 846         if (mainFrame && m_frame != mainFrame) {
 847             FrameView* frameView = m_frame->view();
 848             FrameView* mainView = mainFrame->view();
 849             if (frameView && mainView) {
 850                 IntPoint mainFramePoint = mainView->rootViewToContents(frameView->contentsToRootView(roundedIntPoint(point)));
 851                 return mainFrame->eventHandler().hitTestResultAtPoint(mainFramePoint, hitType, padding);
 852             }
 853         }
 854     }
 855
 856     HitTestResult result(point, padding.height(), padding.width(), padding.height(), padding.width());
 857
 858     // RenderView::hitTest causes a layout, and we don't want to hit that until the first
 859     // layout because until then, there is nothing shown on the screen - the user can't
 860     // have intentionally clicked on something belonging to this page. Furthermore,
 861     // mousemove events before the first layout should not lead to a premature layout()
 862     // happening, which could show a flash of white.
 863     // See also the similar code in Document::prepareMouseEvent.
 864     if (!m_frame->contentRenderer() || !m_frame->view() || !m_frame->view()->didFirstLayout())
 865         return result;
 866
 867     // hitTestResultAtPoint is specifically used to hitTest into all frames, thus it always allows child frame content.
 868     HitTestRequest request(hitType | HitTestRequest::AllowChildFrameContent);
 869     m_frame->contentRenderer()->hitTest(request, result);
 870     if (!request.readOnly())
 871         m_frame->document()->updateHoverActiveState(request, result.innerElement());
 872
 873     return result;
 874 }
 875
 876 void EventHandler::stopAutoscroll()
 877 {
 878     if (AutoscrollController* controller = autoscrollController())
 879         controller->stopAutoscroll();
 880 }
 881
 882 Node* EventHandler::mousePressNode() const
 883 {
 884     return m_mousePressNode.get();
 885 }
 886
 887 bool EventHandler::scroll(ScrollDirection direction, ScrollGranularity granularity, Node* startNode, Node** stopNode, float delta, IntPoint absolutePoint)
 888 {
 889     if (!delta)
 890         return false;
 891
 892     Node* node = startNode;
 893
 894     if (!node)
 895         node = m_frame->document()->focusedElement();
 896
 897     if (!node)
 898         node = m_mousePressNode.get();
 899
 900     if (!node || !node->renderer())
 901         return false;
 902
 903     RenderBox* curBox = node->renderer()->enclosingBox();
 904     while (curBox && !curBox->isRenderView()) {
 905         ScrollDirection physicalDirection = toPhysicalDirection(
 906             direction, curBox->isHorizontalWritingMode(), curBox->style()->isFlippedBlocksWritingMode());
 907
 908         // If we're at the stopNode, we should try to scroll it but we shouldn't bubble past it
 909         bool shouldStopBubbling = stopNode && *stopNode && curBox->node() == *stopNode;
 910         bool didScroll = curBox->scroll(physicalDirection, granularity, delta);
 911
 912         if (didScroll && stopNode)
 913             *stopNode = curBox->node();
 914
 915         if (didScroll || shouldStopBubbling) {
 916             setFrameWasScrolledByUser();
 917             return true;
 918         }
 919
 920         curBox = curBox->containingBlock();
 921     }
 922
 923     return false;
 924 }
 925
 926 bool EventHandler::bubblingScroll(ScrollDirection direction, ScrollGranularity granularity, Node* startingNode)
 927 {
 928     // The layout needs to be up to date to determine if we can scroll. We may be
 929     // here because of an onLoad event, in which case the final layout hasn't been performed yet.
 930     m_frame->document()->updateLayoutIgnorePendingStylesheets();
 931     if (scroll(direction, granularity, startingNode))
 932         return true;
 933     LocalFrame* frame = m_frame;
 934     FrameView* view = frame->view();
 935     if (view && view->scroll(direction, granularity))
 936         return true;
 937     Frame* parentFrame = frame->tree().parent();
 938     if (!parentFrame || !parentFrame->isLocalFrame())
 939         return false;
 940     // FIXME: Broken for OOPI.
 941     return toLocalFrame(parentFrame)->eventHandler().bubblingScroll(direction, granularity, m_frame->deprecatedLocalOwner());
 942 }
 943
 944 IntPoint EventHandler::lastKnownMousePosition() const
 945 {
 946     return m_lastKnownMousePosition;
 947 }
 948
 949 static LocalFrame* subframeForTargetNode(Node* node)
 950 {
 951     if (!node)
 952         return 0;
 953
 954     RenderObject* renderer = node->renderer();
 955     if (!renderer || !renderer->isWidget())
 956         return 0;
 957
 958     // FIXME: This explicit check is needed only until RemoteFrames have RemoteFrameViews.
 959     if (isHTMLFrameElementBase(node) && toHTMLFrameElementBase(node)->contentFrame() && toHTMLFrameElementBase(node)->contentFrame()->isRemoteFrameTemporary())
 960         return 0;
 961
 962     Widget* widget = toRenderWidget(renderer)->widget();
 963     if (!widget || !widget->isFrameView())
 964         return 0;
 965
 966     return &toFrameView(widget)->frame();
 967 }
 968
 969 static LocalFrame* subframeForHitTestResult(const MouseEventWithHitTestResults& hitTestResult)
 970 {
 971     if (!hitTestResult.isOverWidget())
 972         return 0;
 973     return subframeForTargetNode(hitTestResult.innerNode());
 974 }
 975
 976 static bool isSubmitImage(Node* node)
 977 {
 978     return isHTMLInputElement(node) && toHTMLInputElement(node)->type() == InputTypeNames::image;
 979 }
 980
 981 bool EventHandler::useHandCursor(Node* node, bool isOverLink)
 982 {
 983     if (!node)
 984         return false;
 985
 986     return ((isOverLink || isSubmitImage(node)) && !node->hasEditableStyle());
 987 }
 988
 989 void EventHandler::cursorUpdateTimerFired(Timer<EventHandler>*)
 990 {
 991     ASSERT(m_frame);
 992     ASSERT(m_frame->document());
 993
 994     updateCursor();
 995 }
 996
 997 void EventHandler::updateCursor()
 998 {
 999     if (m_mousePositionIsUnknown)
1000         return;
1001
1002     FrameView* view = m_frame->view();
1003     if (!view || !view->shouldSetCursor())
1004         return;
1005
1006     RenderView* renderView = view->renderView();
1007     if (!renderView)
1008         return;
1009
1010     m_frame->document()->updateLayout();
1011
1012     HitTestRequest request(HitTestRequest::ReadOnly);
1013     HitTestResult result(view->windowToContents(m_lastKnownMousePosition));
1014     renderView->hitTest(request, result);
1015
1016     OptionalCursor optionalCursor = selectCursor(result);
1017     if (optionalCursor.isCursorChange()) {
1018         m_currentMouseCursor = optionalCursor.cursor();
1019         view->setCursor(m_currentMouseCursor);
1020     }
1021 }
1022
1023 OptionalCursor EventHandler::selectCursor(const HitTestResult& result)
1024 {
1025     if (m_resizeScrollableArea && m_resizeScrollableArea->inResizeMode())
1026         return NoCursorChange;
1027
1028     Page* page = m_frame->page();
1029     if (!page)
1030         return NoCursorChange;
1031 #if OS(WIN)
1032     if (panScrollInProgress())
1033         return NoCursorChange;
1034 #endif
1035
1036     Node* node = result.innerPossiblyPseudoNode();
1037     if (!node)
1038         return selectAutoCursor(result, node, iBeamCursor());
1039
1040     RenderObject* renderer = node->renderer();
1041     RenderStyle* style = renderer ? renderer->style() : 0;
1042
1043     if (renderer) {
1044         Cursor overrideCursor;
1045         switch (renderer->getCursor(roundedIntPoint(result.localPoint()), overrideCursor)) {
1046         case SetCursorBasedOnStyle:
1047             break;
1048         case SetCursor:
1049             return overrideCursor;
1050         case DoNotSetCursor:
1051             return NoCursorChange;
1052         }
1053     }
1054
1055     if (style && style->cursors()) {
1056         const CursorList* cursors = style->cursors();
1057         for (unsigned i = 0; i < cursors->size(); ++i) {
1058             StyleImage* styleImage = (*cursors)[i].image();
1059             if (!styleImage)
1060                 continue;
1061             ImageResource* cachedImage = styleImage->cachedImage();
1062             if (!cachedImage)
1063                 continue;
1064             float scale = styleImage->imageScaleFactor();
1065             // Get hotspot and convert from logical pixels to physical pixels.
1066             IntPoint hotSpot = (*cursors)[i].hotSpot();
1067             hotSpot.scale(scale, scale);
1068             IntSize size = cachedImage->imageForRenderer(renderer)->size();
1069             if (cachedImage->errorOccurred())
1070                 continue;
1071             // Limit the size of cursors (in UI pixels) so that they cannot be
1072             // used to cover UI elements in chrome.
1073             size.scale(1 / scale);
1074             if (size.width() > maximumCursorSize || size.height() > maximumCursorSize)
1075                 continue;
1076
1077             Image* image = cachedImage->imageForRenderer(renderer);
1078             // Ensure no overflow possible in calculations above.
1079             if (scale < minimumCursorScale)
1080                 continue;
1081             return Cursor(image, hotSpot, scale);
1082         }
1083     }
1084
1085     switch (style ? style->cursor() : CURSOR_AUTO) {
1086     case CURSOR_AUTO: {
1087         bool horizontalText = !style || style->isHorizontalWritingMode();
1088         const Cursor& iBeam = horizontalText ? iBeamCursor() : verticalTextCursor();
1089         return selectAutoCursor(result, node, iBeam);
1090     }
1091     case CURSOR_CROSS:
1092         return crossCursor();
1093     case CURSOR_POINTER:
1094         return handCursor();
1095     case CURSOR_MOVE:
1096         return moveCursor();
1097     case CURSOR_ALL_SCROLL:
1098         return moveCursor();
1099     case CURSOR_E_RESIZE:
1100         return eastResizeCursor();
1101     case CURSOR_W_RESIZE:
1102         return westResizeCursor();
1103     case CURSOR_N_RESIZE:
1104         return northResizeCursor();
1105     case CURSOR_S_RESIZE:
1106         return southResizeCursor();
1107     case CURSOR_NE_RESIZE:
1108         return northEastResizeCursor();
1109     case CURSOR_SW_RESIZE:
1110         return southWestResizeCursor();
1111     case CURSOR_NW_RESIZE:
1112         return northWestResizeCursor();
1113     case CURSOR_SE_RESIZE:
1114         return southEastResizeCursor();
1115     case CURSOR_NS_RESIZE:
1116         return northSouthResizeCursor();
1117     case CURSOR_EW_RESIZE:
1118         return eastWestResizeCursor();
1119     case CURSOR_NESW_RESIZE:
1120         return northEastSouthWestResizeCursor();
1121     case CURSOR_NWSE_RESIZE:
1122         return northWestSouthEastResizeCursor();
1123     case CURSOR_COL_RESIZE:
1124         return columnResizeCursor();
1125     case CURSOR_ROW_RESIZE:
1126         return rowResizeCursor();
1127     case CURSOR_TEXT:
1128         return iBeamCursor();
1129     case CURSOR_WAIT:
1130         return waitCursor();
1131     case CURSOR_HELP:
1132         return helpCursor();
1133     case CURSOR_VERTICAL_TEXT:
1134         return verticalTextCursor();
1135     case CURSOR_CELL:
1136         return cellCursor();
1137     case CURSOR_CONTEXT_MENU:
1138         return contextMenuCursor();
1139     case CURSOR_PROGRESS:
1140         return progressCursor();
1141     case CURSOR_NO_DROP:
1142         return noDropCursor();
1143     case CURSOR_ALIAS:
1144         return aliasCursor();
1145     case CURSOR_COPY:
1146         return copyCursor();
1147     case CURSOR_NONE:
1148         return noneCursor();
1149     case CURSOR_NOT_ALLOWED:
1150         return notAllowedCursor();
1151     case CURSOR_DEFAULT:
1152         return pointerCursor();
1153     case CURSOR_ZOOM_IN:
1154         return zoomInCursor();
1155     case CURSOR_ZOOM_OUT:
1156         return zoomOutCursor();
1157     case CURSOR_WEBKIT_GRAB:
1158         return grabCursor();
1159     case CURSOR_WEBKIT_GRABBING:
1160         return grabbingCursor();
1161     }
1162     return pointerCursor();
1163 }
1164
1165 OptionalCursor EventHandler::selectAutoCursor(const HitTestResult& result, Node* node, const Cursor& iBeam)
1166 {
1167     bool editable = (node && node->hasEditableStyle());
1168
1169     if (useHandCursor(node, result.isOverLink()))
1170         return handCursor();
1171
1172     bool inResizer = false;
1173     RenderObject* renderer = node ? node->renderer() : 0;
1174     if (renderer && m_frame->view()) {
1175         RenderLayer* layer = renderer->enclosingLayer();
1176         inResizer = layer->scrollableArea() && layer->scrollableArea()->isPointInResizeControl(result.roundedPointInMainFrame(), ResizerForPointer);
1177     }
1178
1179     // During selection, use an I-beam no matter what we're over.
1180     // If a drag may be starting or we're capturing mouse events for a particular node, don't treat this as a selection.
1181     if (m_mousePressed && m_mouseDownMayStartSelect
1182         && !m_mouseDownMayStartDrag
1183         && m_frame->selection().isCaretOrRange()
1184         && !m_capturingMouseEventsNode) {
1185         return iBeam;
1186     }
1187
1188     if ((editable || (renderer && renderer->isText() && node->canStartSelection())) && !inResizer && !result.scrollbar())
1189         return iBeam;
1190     return pointerCursor();
1191 }
1192
1193 static LayoutPoint documentPointForWindowPoint(LocalFrame* frame, const IntPoint& windowPoint)
1194 {
1195     FrameView* view = frame->view();
1196     // FIXME: Is it really OK to use the wrong coordinates here when view is 0?
1197     // Historically the code would just crash; this is clearly no worse than that.
1198     return view ? view->windowToContents(windowPoint) : windowPoint;
1199 }
1200
1201 bool EventHandler::handleMousePressEvent(const PlatformMouseEvent& mouseEvent)
1202 {
1203     TRACE_EVENT0("blink", "EventHandler::handleMousePressEvent");
1204
1205     RefPtr<FrameView> protector(m_frame->view());
1206
1207     UserGestureIndicator gestureIndicator(DefinitelyProcessingUserGesture);
1208     m_frame->localFrameRoot()->eventHandler().m_lastMouseDownUserGestureToken = gestureIndicator.currentToken();
1209
1210     cancelFakeMouseMoveEvent();
1211     if (m_eventHandlerWillResetCapturingMouseEventsNode)
1212         m_capturingMouseEventsNode = nullptr;
1213     m_mousePressed = true;
1214     m_capturesDragging = true;
1215     setLastKnownMousePosition(mouseEvent);
1216     m_mouseDownTimestamp = mouseEvent.timestamp();
1217     m_mouseDownMayStartDrag = false;
1218     m_mouseDownMayStartSelect = false;
1219     m_mouseDownMayStartAutoscroll = false;
1220     if (FrameView* view = m_frame->view())
1221         m_mouseDownPos = view->windowToContents(mouseEvent.position());
1222     else {
1223         invalidateClick();
1224         return false;
1225     }
1226     m_mouseDownWasInSubframe = false;
1227
1228     HitTestRequest request(HitTestRequest::Active);
1229     // Save the document point we generate in case the window coordinate is invalidated by what happens
1230     // when we dispatch the event.
1231     LayoutPoint documentPoint = documentPointForWindowPoint(m_frame, mouseEvent.position());
1232     MouseEventWithHitTestResults mev = m_frame->document()->prepareMouseEvent(request, documentPoint, mouseEvent);
1233
1234     if (!mev.innerNode()) {
1235         invalidateClick();
1236         return false;
1237     }
1238
1239     m_mousePressNode = mev.innerNode();
1240
1241     RefPtrWillBeRawPtr<LocalFrame> subframe = subframeForHitTestResult(mev);
1242     if (subframe && passMousePressEventToSubframe(mev, subframe.get())) {
1243         // Start capturing future events for this frame.  We only do this if we didn't clear
1244         // the m_mousePressed flag, which may happen if an AppKit widget entered a modal event loop.
1245         m_capturesDragging = subframe->eventHandler().capturesDragging();
1246         if (m_mousePressed && m_capturesDragging) {
1247             m_capturingMouseEventsNode = mev.innerNode();
1248             m_eventHandlerWillResetCapturingMouseEventsNode = true;
1249         }
1250         invalidateClick();
1251         return true;
1252     }
1253
1254 #if OS(WIN)
1255     // We store whether pan scrolling is in progress before calling stopAutoscroll()
1256     // because it will set m_autoscrollType to NoAutoscroll on return.
1257     bool isPanScrollInProgress = panScrollInProgress();
1258     stopAutoscroll();
1259     if (isPanScrollInProgress) {
1260         // We invalidate the click when exiting pan scrolling so that we don't inadvertently navigate
1261         // away from the current page (e.g. the click was on a hyperlink). See <rdar://problem/6095023>.
1262         invalidateClick();
1263         return true;
1264     }
1265 #endif
1266
1267     m_clickCount = mouseEvent.clickCount();
1268     m_clickNode = mev.innerNode()->isTextNode() ?  NodeRenderingTraversal::parent(mev.innerNode()) : mev.innerNode();
1269
1270     if (FrameView* view = m_frame->view()) {
1271         RenderLayer* layer = mev.innerNode()->renderer() ? mev.innerNode()->renderer()->enclosingLayer() : 0;
1272         IntPoint p = view->windowToContents(mouseEvent.position());
1273         if (layer && layer->scrollableArea() && layer->scrollableArea()->isPointInResizeControl(p, ResizerForPointer)) {
1274             m_resizeScrollableArea = layer->scrollableArea();
1275             m_resizeScrollableArea->setInResizeMode(true);
1276             m_offsetFromResizeCorner = m_resizeScrollableArea->offsetFromResizeCorner(p);
1277             invalidateClick();
1278             return true;
1279         }
1280     }
1281
1282     m_frame->selection().setCaretBlinkingSuspended(true);
1283
1284     bool swallowEvent = !dispatchMouseEvent(EventTypeNames::mousedown, mev.innerNode(), m_clickCount, mouseEvent, true);
1285     // m_selectionInitiationState is initialized after dispatching mousedown event in order not to keep the selection by DOM APIs
1286     // Because we can't give the user the chance to handle the selection by user action like dragging if we keep the selection in case of mousedown.
1287     // FireFox also has the same behavior and it's more compatible with other browsers.
1288     m_selectionInitiationState = HaveNotStartedSelection;
1289     swallowEvent = swallowEvent || handleMouseFocus(mouseEvent);
1290     m_capturesDragging = !swallowEvent || mev.scrollbar();
1291
1292     // If the hit testing originally determined the event was in a scrollbar, refetch the MouseEventWithHitTestResults
1293     // in case the scrollbar widget was destroyed when the mouse event was handled.
1294     if (mev.scrollbar()) {
1295         const bool wasLastScrollBar = mev.scrollbar() == m_lastScrollbarUnderMouse.get();
1296         HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active);
1297         mev = m_frame->document()->prepareMouseEvent(request, documentPoint, mouseEvent);
1298         if (wasLastScrollBar && mev.scrollbar() != m_lastScrollbarUnderMouse.get())
1299             m_lastScrollbarUnderMouse = nullptr;
1300     }
1301
1302     if (swallowEvent) {
1303         // scrollbars should get events anyway, even disabled controls might be scrollable
1304         passMousePressEventToScrollbar(mev);
1305     } else {
1306         if (shouldRefetchEventTarget(mev)) {
1307             HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active);
1308             mev = m_frame->document()->prepareMouseEvent(request, documentPoint, mouseEvent);
1309         }
1310
1311         if (passMousePressEventToScrollbar(mev))
1312             swallowEvent = true;
1313         else
1314             swallowEvent = handleMousePressEvent(mev);
1315     }
1316
1317     return swallowEvent;
1318 }
1319
1320 static RenderLayer* layerForNode(Node* node)
1321 {
1322     if (!node)
1323         return 0;
1324
1325     RenderObject* renderer = node->renderer();
1326     if (!renderer)
1327         return 0;
1328
1329     RenderLayer* layer = renderer->enclosingLayer();
1330     if (!layer)
1331         return 0;
1332
1333     return layer;
1334 }
1335
1336 ScrollableArea* EventHandler::associatedScrollableArea(const RenderLayer* layer) const
1337 {
1338     if (RenderLayerScrollableArea* scrollableArea = layer->scrollableArea()) {
1339         if (scrollableArea->scrollsOverflow())
1340             return scrollableArea;
1341     }
1342
1343     return 0;
1344 }
1345
1346 bool EventHandler::handleMouseMoveEvent(const PlatformMouseEvent& event)
1347 {
1348     TRACE_EVENT0("blink", "EventHandler::handleMouseMoveEvent");
1349
1350     RefPtr<FrameView> protector(m_frame->view());
1351     MaximumDurationTracker maxDurationTracker(&m_maxMouseMovedDuration);
1352
1353     HitTestResult hoveredNode = HitTestResult(LayoutPoint());
1354     bool result = handleMouseMoveOrLeaveEvent(event, &hoveredNode);
1355
1356     Page* page = m_frame->page();
1357     if (!page)
1358         return result;
1359
1360     if (RenderLayer* layer = layerForNode(hoveredNode.innerNode())) {
1361         if (ScrollableArea* layerScrollableArea = associatedScrollableArea(layer))
1362             layerScrollableArea->mouseMovedInContentArea();
1363     }
1364
1365     if (FrameView* frameView = m_frame->view())
1366         frameView->mouseMovedInContentArea();
1367
1368     hoveredNode.setToShadowHostIfInUserAgentShadowRoot();
1369     page->chrome().mouseDidMoveOverElement(hoveredNode, event.modifierFlags());
1370     page->chrome().setToolTip(hoveredNode);
1371
1372     return result;
1373 }
1374
1375 void EventHandler::handleMouseLeaveEvent(const PlatformMouseEvent& event)
1376 {
1377     TRACE_EVENT0("blink", "EventHandler::handleMouseLeaveEvent");
1378
1379     RefPtr<FrameView> protector(m_frame->view());
1380     handleMouseMoveOrLeaveEvent(event);
1381 }
1382
1383 bool EventHandler::handleMouseMoveOrLeaveEvent(const PlatformMouseEvent& mouseEvent, HitTestResult* hoveredNode, bool onlyUpdateScrollbars)
1384 {
1385     ASSERT(m_frame);
1386     ASSERT(m_frame->view());
1387
1388     setLastKnownMousePosition(mouseEvent);
1389
1390     if (m_hoverTimer.isActive())
1391         m_hoverTimer.stop();
1392
1393     m_cursorUpdateTimer.stop();
1394
1395     cancelFakeMouseMoveEvent();
1396
1397     if (m_svgPan) {
1398         m_frame->document()->accessSVGExtensions().updatePan(m_frame->view()->windowToContents(m_lastKnownMousePosition));
1399         return true;
1400     }
1401
1402     if (m_frameSetBeingResized)
1403         return !dispatchMouseEvent(EventTypeNames::mousemove, m_frameSetBeingResized.get(), 0, mouseEvent, false);
1404
1405     // Send events right to a scrollbar if the mouse is pressed.
1406     if (m_lastScrollbarUnderMouse && m_mousePressed) {
1407         m_lastScrollbarUnderMouse->mouseMoved(mouseEvent);
1408         return true;
1409     }
1410
1411     // Mouse events simulated from touch should not hit-test again.
1412     ASSERT(!mouseEvent.fromTouch());
1413
1414     HitTestRequest::HitTestRequestType hitType = HitTestRequest::Move;
1415     if (m_mousePressed)
1416         hitType |= HitTestRequest::Active;
1417     else if (onlyUpdateScrollbars) {
1418         // Mouse events should be treated as "read-only" if we're updating only scrollbars. This
1419         // means that :hover and :active freeze in the state they were in, rather than updating
1420         // for nodes the mouse moves while the window is not key (which will be the case if
1421         // onlyUpdateScrollbars is true).
1422         hitType |= HitTestRequest::ReadOnly;
1423     }
1424
1425     // Treat any mouse move events as readonly if the user is currently touching the screen.
1426     if (m_touchPressed)
1427         hitType |= HitTestRequest::Active | HitTestRequest::ReadOnly;
1428     HitTestRequest request(hitType);
1429     MouseEventWithHitTestResults mev = prepareMouseEvent(request, mouseEvent);
1430     if (hoveredNode)
1431         *hoveredNode = mev.hitTestResult();
1432
1433     Scrollbar* scrollbar = 0;
1434
1435     if (m_resizeScrollableArea && m_resizeScrollableArea->inResizeMode())
1436         m_resizeScrollableArea->resize(mouseEvent, m_offsetFromResizeCorner);
1437     else {
1438         if (!scrollbar)
1439             scrollbar = mev.scrollbar();
1440
1441         updateLastScrollbarUnderMouse(scrollbar, !m_mousePressed);
1442         if (onlyUpdateScrollbars)
1443             return true;
1444     }
1445
1446     bool swallowEvent = false;
1447     RefPtrWillBeRawPtr<LocalFrame> newSubframe = m_capturingMouseEventsNode.get() ? subframeForTargetNode(m_capturingMouseEventsNode.get()) : subframeForHitTestResult(mev);
1448
1449     // We want mouseouts to happen first, from the inside out.  First send a move event to the last subframe so that it will fire mouseouts.
1450     if (m_lastMouseMoveEventSubframe && m_lastMouseMoveEventSubframe->tree().isDescendantOf(m_frame) && m_lastMouseMoveEventSubframe != newSubframe)
1451         passMouseMoveEventToSubframe(mev, m_lastMouseMoveEventSubframe.get());
1452
1453     if (newSubframe) {
1454         // Update over/out state before passing the event to the subframe.
1455         updateMouseEventTargetNode(mev.innerNode(), mouseEvent, true);
1456
1457         // Event dispatch in updateMouseEventTargetNode may have caused the subframe of the target
1458         // node to be detached from its FrameView, in which case the event should not be passed.
1459         if (newSubframe->view())
1460             swallowEvent |= passMouseMoveEventToSubframe(mev, newSubframe.get(), hoveredNode);
1461     } else {
1462         if (scrollbar && !m_mousePressed)
1463             scrollbar->mouseMoved(mouseEvent); // Handle hover effects on platforms that support visual feedback on scrollbar hovering.
1464         if (FrameView* view = m_frame->view()) {
1465             OptionalCursor optionalCursor = selectCursor(mev.hitTestResult());
1466             if (optionalCursor.isCursorChange()) {
1467                 m_currentMouseCursor = optionalCursor.cursor();
1468                 view->setCursor(m_currentMouseCursor);
1469             }
1470         }
1471     }
1472
1473     m_lastMouseMoveEventSubframe = newSubframe;
1474
1475     if (swallowEvent)
1476         return true;
1477
1478     swallowEvent = !dispatchMouseEvent(EventTypeNames::mousemove, mev.innerNode(), 0, mouseEvent, true);
1479     if (!swallowEvent)
1480         swallowEvent = handleMouseDraggedEvent(mev);
1481
1482     return swallowEvent;
1483 }
1484
1485 void EventHandler::invalidateClick()
1486 {
1487     m_clickCount = 0;
1488     m_clickNode = nullptr;
1489 }
1490
1491 static Node* parentForClickEvent(const Node& node)
1492 {
1493     // IE doesn't dispatch click events for mousedown/mouseup events across form
1494     // controls.
1495     if (node.isHTMLElement() && toHTMLElement(node).isInteractiveContent())
1496         return 0;
1497     return NodeRenderingTraversal::parent(&node);
1498 }
1499
1500 bool EventHandler::handleMouseReleaseEvent(const PlatformMouseEvent& mouseEvent)
1501 {
1502     TRACE_EVENT0("blink", "EventHandler::handleMouseReleaseEvent");
1503
1504     RefPtr<FrameView> protector(m_frame->view());
1505
1506     m_frame->selection().setCaretBlinkingSuspended(false);
1507
1508     OwnPtr<UserGestureIndicator> gestureIndicator;
1509
1510     if (m_frame->localFrameRoot()->eventHandler().m_lastMouseDownUserGestureToken)
1511         gestureIndicator = adoptPtr(new UserGestureIndicator(m_frame->localFrameRoot()->eventHandler().m_lastMouseDownUserGestureToken.release()));
1512     else
1513         gestureIndicator = adoptPtr(new UserGestureIndicator(DefinitelyProcessingUserGesture));
1514
1515 #if OS(WIN)
1516     if (Page* page = m_frame->page())
1517         page->autoscrollController().handleMouseReleaseForPanScrolling(m_frame, mouseEvent);
1518 #endif
1519
1520     m_mousePressed = false;
1521     setLastKnownMousePosition(mouseEvent);
1522
1523     if (m_svgPan) {
1524         m_svgPan = false;
1525         m_frame->document()->accessSVGExtensions().updatePan(m_frame->view()->windowToContents(m_lastKnownMousePosition));
1526         return true;
1527     }
1528
1529     if (m_frameSetBeingResized)
1530         return !dispatchMouseEvent(EventTypeNames::mouseup, m_frameSetBeingResized.get(), m_clickCount, mouseEvent, false);
1531
1532     if (m_lastScrollbarUnderMouse) {
1533         invalidateClick();
1534         m_lastScrollbarUnderMouse->mouseUp(mouseEvent);
1535         bool setUnder = false;
1536         return !dispatchMouseEvent(EventTypeNames::mouseup, m_lastNodeUnderMouse.get(), m_clickCount, mouseEvent, setUnder);
1537     }
1538
1539     // Mouse events simulated from touch should not hit-test again.
1540     ASSERT(!mouseEvent.fromTouch());
1541
1542     HitTestRequest::HitTestRequestType hitType = HitTestRequest::Release;
1543     HitTestRequest request(hitType);
1544     MouseEventWithHitTestResults mev = prepareMouseEvent(request, mouseEvent);
1545     LocalFrame* subframe = m_capturingMouseEventsNode.get() ? subframeForTargetNode(m_capturingMouseEventsNode.get()) : subframeForHitTestResult(mev);
1546     if (m_eventHandlerWillResetCapturingMouseEventsNode)
1547         m_capturingMouseEventsNode = nullptr;
1548     if (subframe && passMouseReleaseEventToSubframe(mev, subframe))
1549         return true;
1550
1551     bool swallowMouseUpEvent = !dispatchMouseEvent(EventTypeNames::mouseup, mev.innerNode(), m_clickCount, mouseEvent, false);
1552
1553     bool contextMenuEvent = mouseEvent.button() == RightButton;
1554 #if OS(MACOSX)
1555     // FIXME: The Mac port achieves the same behavior by checking whether the context menu is currently open in WebPage::mouseEvent(). Consider merging the implementations.
1556     if (mouseEvent.button() == LeftButton && mouseEvent.modifiers() & PlatformEvent::CtrlKey)
1557         contextMenuEvent = true;
1558 #endif
1559
1560     bool swallowClickEvent = false;
1561     if (m_clickCount > 0 && !contextMenuEvent && mev.innerNode() && m_clickNode) {
1562         if (Node* clickTargetNode = mev.innerNode()->commonAncestor(*m_clickNode, parentForClickEvent))
1563             swallowClickEvent = !dispatchMouseEvent(EventTypeNames::click, clickTargetNode, m_clickCount, mouseEvent, true);
1564     }
1565
1566     if (m_resizeScrollableArea) {
1567         m_resizeScrollableArea->setInResizeMode(false);
1568         m_resizeScrollableArea = 0;
1569     }
1570
1571     bool swallowMouseReleaseEvent = false;
1572     if (!swallowMouseUpEvent)
1573         swallowMouseReleaseEvent = handleMouseReleaseEvent(mev);
1574
1575     invalidateClick();
1576
1577     return swallowMouseUpEvent || swallowClickEvent || swallowMouseReleaseEvent;
1578 }
1579
1580 bool EventHandler::handlePasteGlobalSelection(const PlatformMouseEvent& mouseEvent)
1581 {
1582     // If the event was a middle click, attempt to copy global selection in after
1583     // the newly set caret position.
1584     //
1585     // This code is called from either the mouse up or mouse down handling. There
1586     // is some debate about when the global selection is pasted:
1587     //   xterm: pastes on up.
1588     //   GTK: pastes on down.
1589     //   Qt: pastes on up.
1590     //   Firefox: pastes on up.
1591     //   Chromium: pastes on up.
1592     //
1593     // There is something of a webcompat angle to this well, as highlighted by
1594     // crbug.com/14608. Pages can clear text boxes 'onclick' and, if we paste on
1595     // down then the text is pasted just before the onclick handler runs and
1596     // clears the text box. So it's important this happens after the event
1597     // handlers have been fired.
1598     if (mouseEvent.type() != PlatformEvent::MouseReleased)
1599         return false;
1600
1601     if (!m_frame->page())
1602         return false;
1603     Frame* focusFrame = m_frame->page()->focusController().focusedOrMainFrame();
1604     // Do not paste here if the focus was moved somewhere else.
1605     if (m_frame == focusFrame && m_frame->editor().behavior().supportsGlobalSelection())
1606         return m_frame->editor().command("PasteGlobalSelection").execute();
1607
1608     return false;
1609 }
1610
1611
1612 bool EventHandler::dispatchDragEvent(const AtomicString& eventType, Node* dragTarget, const PlatformMouseEvent& event, DataTransfer* dataTransfer)
1613 {
1614     FrameView* view = m_frame->view();
1615
1616     // FIXME: We might want to dispatch a dragleave even if the view is gone.
1617     if (!view)
1618         return false;
1619
1620     RefPtrWillBeRawPtr<MouseEvent> me = MouseEvent::create(eventType,
1621         true, true, m_frame->document()->domWindow(),
1622         0, event.globalPosition().x(), event.globalPosition().y(), event.position().x(), event.position().y(),
1623         event.movementDelta().x(), event.movementDelta().y(),
1624         event.ctrlKey(), event.altKey(), event.shiftKey(), event.metaKey(),
1625         0, nullptr, dataTransfer);
1626
1627     dragTarget->dispatchEvent(me.get(), IGNORE_EXCEPTION);
1628     return me->defaultPrevented();
1629 }
1630
1631 static bool targetIsFrame(Node* target, LocalFrame*& frame)
1632 {
1633     if (!isHTMLFrameElementBase(target))
1634         return false;
1635
1636     // Cross-process drag and drop is not yet supported.
1637     if (toHTMLFrameElementBase(target)->contentFrame() && !toHTMLFrameElementBase(target)->contentFrame()->isLocalFrame())
1638         return false;
1639
1640     frame = toLocalFrame(toHTMLFrameElementBase(target)->contentFrame());
1641     return true;
1642 }
1643
1644 static bool findDropZone(Node* target, DataTransfer* dataTransfer)
1645 {
1646     Element* element = target->isElementNode() ? toElement(target) : target->parentElement();
1647     for (; element; element = element->parentElement()) {
1648         bool matched = false;
1649         AtomicString dropZoneStr = element->fastGetAttribute(webkitdropzoneAttr);
1650
1651         if (dropZoneStr.isEmpty())
1652             continue;
1653
1654         UseCounter::count(element->document(), UseCounter::PrefixedHTMLElementDropzone);
1655
1656         dropZoneStr = dropZoneStr.lower();
1657
1658         SpaceSplitString keywords(dropZoneStr, false);
1659         if (keywords.isNull())
1660             continue;
1661
1662         DragOperation dragOperation = DragOperationNone;
1663         for (unsigned i = 0; i < keywords.size(); i++) {
1664             DragOperation op = convertDropZoneOperationToDragOperation(keywords[i]);
1665             if (op != DragOperationNone) {
1666                 if (dragOperation == DragOperationNone)
1667                     dragOperation = op;
1668             } else {
1669                 matched = matched || dataTransfer->hasDropZoneType(keywords[i].string());
1670             }
1671
1672             if (matched && dragOperation != DragOperationNone)
1673                 break;
1674         }
1675         if (matched) {
1676             dataTransfer->setDropEffect(convertDragOperationToDropZoneOperation(dragOperation));
1677             return true;
1678         }
1679     }
1680     return false;
1681 }
1682
1683 bool EventHandler::updateDragAndDrop(const PlatformMouseEvent& event, DataTransfer* dataTransfer)
1684 {
1685     bool accept = false;
1686
1687     if (!m_frame->view())
1688         return false;
1689
1690     HitTestRequest request(HitTestRequest::ReadOnly);
1691     MouseEventWithHitTestResults mev = prepareMouseEvent(request, event);
1692
1693     // Drag events should never go to text nodes (following IE, and proper mouseover/out dispatch)
1694     RefPtrWillBeRawPtr<Node> newTarget = mev.innerNode();
1695     if (newTarget && newTarget->isTextNode())
1696         newTarget = NodeRenderingTraversal::parent(newTarget.get());
1697
1698     if (AutoscrollController* controller = autoscrollController())
1699         controller->updateDragAndDrop(newTarget.get(), event.position(), event.timestamp());
1700
1701     if (m_dragTarget != newTarget) {
1702         // FIXME: this ordering was explicitly chosen to match WinIE. However,
1703         // it is sometimes incorrect when dragging within subframes, as seen with
1704         // LayoutTests/fast/events/drag-in-frames.html.
1705         //
1706         // Moreover, this ordering conforms to section 7.9.4 of the HTML 5 spec. <http://dev.w3.org/html5/spec/Overview.html#drag-and-drop-processing-model>.
1707         LocalFrame* targetFrame;
1708         if (targetIsFrame(newTarget.get(), targetFrame)) {
1709             if (targetFrame)
1710                 accept = targetFrame->eventHandler().updateDragAndDrop(event, dataTransfer);
1711         } else if (newTarget) {
1712             // As per section 7.9.4 of the HTML 5 spec., we must always fire a drag event before firing a dragenter, dragleave, or dragover event.
1713             if (dragState().m_dragSrc) {
1714                 // for now we don't care if event handler cancels default behavior, since there is none
1715                 dispatchDragSrcEvent(EventTypeNames::drag, event);
1716             }
1717             accept = dispatchDragEvent(EventTypeNames::dragenter, newTarget.get(), event, dataTransfer);
1718             if (!accept)
1719                 accept = findDropZone(newTarget.get(), dataTransfer);
1720         }
1721
1722         if (targetIsFrame(m_dragTarget.get(), targetFrame)) {
1723             if (targetFrame)
1724                 accept = targetFrame->eventHandler().updateDragAndDrop(event, dataTransfer);
1725         } else if (m_dragTarget) {
1726             dispatchDragEvent(EventTypeNames::dragleave, m_dragTarget.get(), event, dataTransfer);
1727         }
1728
1729         if (newTarget) {
1730             // We do not explicitly call dispatchDragEvent here because it could ultimately result in the appearance that
1731             // two dragover events fired. So, we mark that we should only fire a dragover event on the next call to this function.
1732             m_shouldOnlyFireDragOverEvent = true;
1733         }
1734     } else {
1735         LocalFrame* targetFrame;
1736         if (targetIsFrame(newTarget.get(), targetFrame)) {
1737             if (targetFrame)
1738                 accept = targetFrame->eventHandler().updateDragAndDrop(event, dataTransfer);
1739         } else if (newTarget) {
1740             // Note, when dealing with sub-frames, we may need to fire only a dragover event as a drag event may have been fired earlier.
1741             if (!m_shouldOnlyFireDragOverEvent && dragState().m_dragSrc) {
1742                 // for now we don't care if event handler cancels default behavior, since there is none
1743                 dispatchDragSrcEvent(EventTypeNames::drag, event);
1744             }
1745             accept = dispatchDragEvent(EventTypeNames::dragover, newTarget.get(), event, dataTransfer);
1746             if (!accept)
1747                 accept = findDropZone(newTarget.get(), dataTransfer);
1748             m_shouldOnlyFireDragOverEvent = false;
1749         }
1750     }
1751     m_dragTarget = newTarget;
1752
1753     return accept;
1754 }
1755
1756 void EventHandler::cancelDragAndDrop(const PlatformMouseEvent& event, DataTransfer* dataTransfer)
1757 {
1758     LocalFrame* targetFrame;
1759     if (targetIsFrame(m_dragTarget.get(), targetFrame)) {
1760         if (targetFrame)
1761             targetFrame->eventHandler().cancelDragAndDrop(event, dataTransfer);
1762     } else if (m_dragTarget.get()) {
1763         if (dragState().m_dragSrc)
1764             dispatchDragSrcEvent(EventTypeNames::drag, event);
1765         dispatchDragEvent(EventTypeNames::dragleave, m_dragTarget.get(), event, dataTransfer);
1766     }
1767     clearDragState();
1768 }
1769
1770 bool EventHandler::performDragAndDrop(const PlatformMouseEvent& event, DataTransfer* dataTransfer)
1771 {
1772     LocalFrame* targetFrame;
1773     bool preventedDefault = false;
1774     if (targetIsFrame(m_dragTarget.get(), targetFrame)) {
1775         if (targetFrame)
1776             preventedDefault = targetFrame->eventHandler().performDragAndDrop(event, dataTransfer);
1777     } else if (m_dragTarget.get()) {
1778         preventedDefault = dispatchDragEvent(EventTypeNames::drop, m_dragTarget.get(), event, dataTransfer);
1779     }
1780     clearDragState();
1781     return preventedDefault;
1782 }
1783
1784 void EventHandler::clearDragState()
1785 {
1786     stopAutoscroll();
1787     m_dragTarget = nullptr;
1788     m_capturingMouseEventsNode = nullptr;
1789     m_shouldOnlyFireDragOverEvent = false;
1790 }
1791
1792 void EventHandler::setCapturingMouseEventsNode(PassRefPtrWillBeRawPtr<Node> n)
1793 {
1794     m_capturingMouseEventsNode = n;
1795     m_eventHandlerWillResetCapturingMouseEventsNode = false;
1796 }
1797
1798 MouseEventWithHitTestResults EventHandler::prepareMouseEvent(const HitTestRequest& request, const PlatformMouseEvent& mev)
1799 {
1800     ASSERT(m_frame);
1801     ASSERT(m_frame->document());
1802
1803     return m_frame->document()->prepareMouseEvent(request, documentPointForWindowPoint(m_frame, mev.position()), mev);
1804 }
1805
1806 void EventHandler::updateMouseEventTargetNode(Node* targetNode, const PlatformMouseEvent& mouseEvent, bool fireMouseOverOut)
1807 {
1808     Node* result = targetNode;
1809
1810     // If we're capturing, we always go right to that node.
1811     if (m_capturingMouseEventsNode)
1812         result = m_capturingMouseEventsNode.get();
1813     else {
1814         // If the target node is a text node, dispatch on the parent node - rdar://4196646
1815         if (result && result->isTextNode())
1816             result = NodeRenderingTraversal::parent(result);
1817     }
1818     m_nodeUnderMouse = result;
1819
1820     // Fire mouseout/mouseover if the mouse has shifted to a different node.
1821     if (fireMouseOverOut) {
1822         RenderLayer* layerForLastNode = layerForNode(m_lastNodeUnderMouse.get());
1823         RenderLayer* layerForNodeUnderMouse = layerForNode(m_nodeUnderMouse.get());
1824         Page* page = m_frame->page();
1825
1826         if (m_lastNodeUnderMouse && (!m_nodeUnderMouse || m_nodeUnderMouse->document() != m_frame->document())) {
1827             // The mouse has moved between frames.
1828             if (LocalFrame* frame = m_lastNodeUnderMouse->document().frame()) {
1829                 if (FrameView* frameView = frame->view())
1830                     frameView->mouseExitedContentArea();
1831             }
1832         } else if (page && (layerForLastNode && (!layerForNodeUnderMouse || layerForNodeUnderMouse != layerForLastNode))) {
1833             // The mouse has moved between layers.
1834             if (ScrollableArea* scrollableAreaForLastNode = associatedScrollableArea(layerForLastNode))
1835                 scrollableAreaForLastNode->mouseExitedContentArea();
1836         }
1837
1838         if (m_nodeUnderMouse && (!m_lastNodeUnderMouse || m_lastNodeUnderMouse->document() != m_frame->document())) {
1839             // The mouse has moved between frames.
1840             if (LocalFrame* frame = m_nodeUnderMouse->document().frame()) {
1841                 if (FrameView* frameView = frame->view())
1842                     frameView->mouseEnteredContentArea();
1843             }
1844         } else if (page && (layerForNodeUnderMouse && (!layerForLastNode || layerForNodeUnderMouse != layerForLastNode))) {
1845             // The mouse has moved between layers.
1846             if (ScrollableArea* scrollableAreaForNodeUnderMouse = associatedScrollableArea(layerForNodeUnderMouse))
1847                 scrollableAreaForNodeUnderMouse->mouseEnteredContentArea();
1848         }
1849
1850         if (m_lastNodeUnderMouse && m_lastNodeUnderMouse->document() != m_frame->document()) {
1851             m_lastNodeUnderMouse = nullptr;
1852             m_lastScrollbarUnderMouse = nullptr;
1853         }
1854
1855         if (m_lastNodeUnderMouse != m_nodeUnderMouse) {
1856             // send mouseout event to the old node
1857             if (m_lastNodeUnderMouse)
1858                 m_lastNodeUnderMouse->dispatchMouseEvent(mouseEvent, EventTypeNames::mouseout, 0, m_nodeUnderMouse.get());
1859             // send mouseover event to the new node
1860             if (m_nodeUnderMouse)
1861                 m_nodeUnderMouse->dispatchMouseEvent(mouseEvent, EventTypeNames::mouseover, 0, m_lastNodeUnderMouse.get());
1862         }
1863         m_lastNodeUnderMouse = m_nodeUnderMouse;
1864     }
1865 }
1866
1867 // The return value means 'continue default handling.'
1868 bool EventHandler::dispatchMouseEvent(const AtomicString& eventType, Node* targetNode, int clickCount, const PlatformMouseEvent& mouseEvent, bool setUnder)
1869 {
1870     updateMouseEventTargetNode(targetNode, mouseEvent, setUnder);
1871     return !m_nodeUnderMouse || m_nodeUnderMouse->dispatchMouseEvent(mouseEvent, eventType, clickCount);
1872 }
1873
1874 // The return value means 'swallow event' (was handled), as for other handle* functions.
1875 bool EventHandler::handleMouseFocus(const PlatformMouseEvent& mouseEvent)
1876 {
1877     // If clicking on a frame scrollbar, do not mess up with content focus.
1878     if (FrameView* view = m_frame->view()) {
1879         if (view->scrollbarAtWindowPoint(mouseEvent.position()))
1880             return false;
1881     }
1882
1883     // The layout needs to be up to date to determine if an element is focusable.
1884     m_frame->document()->updateLayoutIgnorePendingStylesheets();
1885
1886     Element* element = 0;
1887     if (m_nodeUnderMouse)
1888         element = m_nodeUnderMouse->isElementNode() ? toElement(m_nodeUnderMouse) : m_nodeUnderMouse->parentOrShadowHostElement();
1889     for (; element; element = element->parentOrShadowHostElement()) {
1890         if (element->isFocusable() && element->focused())
1891             return false;
1892         if (element->isMouseFocusable())
1893             break;
1894     }
1895     ASSERT(!element || element->isMouseFocusable());
1896
1897     // To fix <rdar://problem/4895428> Can't drag selected ToDo, we don't focus
1898     // a node on mouse down if it's selected and inside a focused node. It will
1899     // be focused if the user does a mouseup over it, however, because the
1900     // mouseup will set a selection inside it, which will call
1901     // FrameSelection::setFocusedNodeIfNeeded.
1902     if (element
1903         && m_frame->selection().isRange()
1904         && m_frame->selection().toNormalizedRange()->compareNode(element, IGNORE_EXCEPTION) == Range::NODE_INSIDE
1905         && element->isDescendantOf(m_frame->document()->focusedElement()))
1906         return false;
1907
1908     // Only change the focus when clicking scrollbars if it can transfered to a
1909     // mouse focusable node.
1910     if (!element && isInsideScrollbar(mouseEvent.position()))
1911         return true;
1912
1913     if (Page* page = m_frame->page()) {
1914         // If focus shift is blocked, we eat the event. Note we should never
1915         // clear swallowEvent if the page already set it (e.g., by canceling
1916         // default behavior).
1917         if (element) {
1918             if (!page->focusController().setFocusedElement(element, m_frame, FocusTypeMouse))
1919                 return true;
1920         } else {
1921             // We call setFocusedElement even with !element in order to blur
1922             // current focus element when a link is clicked; this is expected by
1923             // some sites that rely on onChange handlers running from form
1924             // fields before the button click is processed.
1925             if (!page->focusController().setFocusedElement(0, m_frame))
1926                 return true;
1927         }
1928     }
1929
1930     return false;
1931 }
1932
1933 bool EventHandler::isInsideScrollbar(const IntPoint& windowPoint) const
1934 {
1935     if (RenderView* renderView = m_frame->contentRenderer()) {
1936         HitTestRequest request(HitTestRequest::ReadOnly);
1937         HitTestResult result(windowPoint);
1938         renderView->hitTest(request, result);
1939         return result.scrollbar();
1940     }
1941
1942     return false;
1943 }
1944
1945 bool EventHandler::handleWheelEvent(const PlatformWheelEvent& event)
1946 {
1947 #define RETURN_WHEEL_EVENT_HANDLED() \
1948     { \
1949         setFrameWasScrolledByUser(); \
1950         return true; \
1951     }
1952
1953     Document* doc = m_frame->document();
1954
1955     if (!doc->renderView())
1956         return false;
1957
1958     RefPtr<FrameView> protector(m_frame->view());
1959
1960     FrameView* view = m_frame->view();
1961     if (!view)
1962         return false;
1963
1964     LayoutPoint vPoint = view->windowToContents(event.position());
1965
1966     HitTestRequest request(HitTestRequest::ReadOnly);
1967     HitTestResult result(vPoint);
1968     doc->renderView()->hitTest(request, result);
1969
1970     Node* node = result.innerNode();
1971     // Wheel events should not dispatch to text nodes.
1972     if (node && node->isTextNode())
1973         node = NodeRenderingTraversal::parent(node);
1974
1975     bool isOverWidget;
1976     if (event.useLatchedEventNode()) {
1977         if (!m_latchedWheelEventNode) {
1978             m_latchedWheelEventNode = node;
1979             m_widgetIsLatched = result.isOverWidget();
1980         } else
1981             node = m_latchedWheelEventNode.get();
1982
1983         isOverWidget = m_widgetIsLatched;
1984     } else {
1985         if (m_latchedWheelEventNode)
1986             m_latchedWheelEventNode = nullptr;
1987         if (m_previousWheelScrolledNode)
1988             m_previousWheelScrolledNode = nullptr;
1989
1990         isOverWidget = result.isOverWidget();
1991     }
1992
1993     if (node) {
1994         // Figure out which view to send the event to.
1995         RenderObject* target = node->renderer();
1996
1997         if (isOverWidget && target && target->isWidget()) {
1998             Widget* widget = toRenderWidget(target)->widget();
1999             if (widget && passWheelEventToWidget(event, widget))
2000                 RETURN_WHEEL_EVENT_HANDLED();
2001         }
2002
2003         if (node && !node->dispatchWheelEvent(event))
2004             RETURN_WHEEL_EVENT_HANDLED();
2005     }
2006
2007     // We do another check on the frame view because the event handler can run JS which results in the frame getting destroyed.
2008     view = m_frame->view();
2009     if (!view || !view->wheelEvent(event))
2010         return false;
2011
2012     RETURN_WHEEL_EVENT_HANDLED();
2013
2014 #undef RETURN_WHEEL_EVENT_HANDLED
2015 }
2016
2017 void EventHandler::defaultWheelEventHandler(Node* startNode, WheelEvent* wheelEvent)
2018 {
2019     if (!startNode || !wheelEvent)
2020         return;
2021
2022     // Ctrl + scrollwheel is reserved for triggering zoom in/out actions in Chromium.
2023     if (wheelEvent->ctrlKey())
2024         return;
2025
2026     Node* stopNode = m_previousWheelScrolledNode.get();
2027     ScrollGranularity granularity = wheelGranularityToScrollGranularity(wheelEvent->deltaMode());
2028
2029     // Break up into two scrolls if we need to.  Diagonal movement on
2030     // a MacBook pro is an example of a 2-dimensional mouse wheel event (where both deltaX and deltaY can be set).
2031     if (scroll(ScrollRight, granularity, startNode, &stopNode, wheelEvent->deltaX(), roundedIntPoint(wheelEvent->absoluteLocation())))
2032         wheelEvent->setDefaultHandled();
2033
2034     if (scroll(ScrollDown, granularity, startNode, &stopNode, wheelEvent->deltaY(), roundedIntPoint(wheelEvent->absoluteLocation())))
2035         wheelEvent->setDefaultHandled();
2036
2037     if (!m_latchedWheelEventNode)
2038         m_previousWheelScrolledNode = stopNode;
2039 }
2040
2041 bool EventHandler::handleGestureShowPress()
2042 {
2043     m_lastShowPressTimestamp = WTF::currentTime();
2044
2045     FrameView* view = m_frame->view();
2046     if (!view)
2047         return false;
2048     if (ScrollAnimator* scrollAnimator = view->existingScrollAnimator())
2049         scrollAnimator->cancelAnimations();
2050     const FrameView::ScrollableAreaSet* areas = view->scrollableAreas();
2051     if (!areas)
2052         return false;
2053     for (FrameView::ScrollableAreaSet::const_iterator it = areas->begin(); it != areas->end(); ++it) {
2054         ScrollableArea* sa = *it;
2055         ScrollAnimator* animator = sa->existingScrollAnimator();
2056         if (animator)
2057             animator->cancelAnimations();
2058     }
2059     return false;
2060 }
2061
2062 bool EventHandler::handleGestureEvent(const PlatformGestureEvent& gestureEvent)
2063 {
2064     // Propagation to inner frames is handled below this function.
2065     ASSERT(m_frame == m_frame->localFrameRoot());
2066
2067     // Scrolling-related gesture events invoke EventHandler recursively for each frame down
2068     // the chain, doing a single-frame hit-test per frame. This matches handleWheelEvent.
2069     // FIXME: Add a test that traverses this path, e.g. for devtools overlay.
2070     if (gestureEvent.isScrollEvent())
2071         return handleGestureScrollEvent(gestureEvent);
2072
2073     // Hit test across all frames and do touch adjustment as necessary for the event type.
2074     GestureEventWithHitTestResults targetedEvent = targetGestureEvent(gestureEvent);
2075
2076     return handleGestureEvent(targetedEvent);
2077 }
2078
2079 bool EventHandler::handleGestureEvent(const GestureEventWithHitTestResults& targetedEvent)
2080 {
2081     TRACE_EVENT0("input", "EventHandler::handleGestureEvent");
2082
2083     // Propagation to inner frames is handled below this function.
2084     ASSERT(m_frame == m_frame->localFrameRoot());
2085
2086     // Non-scrolling related gesture events do a single cross-frame hit-test and jump
2087     // directly to the inner most frame. This matches handleMousePressEvent etc.
2088     ASSERT(!targetedEvent.event().isScrollEvent());
2089
2090     // Route to the correct frame.
2091     if (LocalFrame* innerFrame = targetedEvent.hitTestResult().innerNodeFrame())
2092         return innerFrame->eventHandler().handleGestureEventInFrame(targetedEvent);
2093
2094     // No hit test result, handle in root instance. Perhaps we should just return false instead?
2095     return handleGestureEventInFrame(targetedEvent);
2096 }
2097
2098 bool EventHandler::handleGestureEventInFrame(const GestureEventWithHitTestResults& targetedEvent)
2099 {
2100     ASSERT(!targetedEvent.event().isScrollEvent());
2101
2102     RefPtrWillBeRawPtr<Node> eventTarget = targetedEvent.hitTestResult().innerNode();
2103     RefPtr<Scrollbar> scrollbar = targetedEvent.hitTestResult().scrollbar();
2104     const PlatformGestureEvent& gestureEvent = targetedEvent.event();
2105
2106     if (scrollbar) {
2107         bool eventSwallowed = scrollbar->gestureEvent(gestureEvent);
2108         if (gestureEvent.type() == PlatformEvent::GestureTapDown && eventSwallowed)
2109             m_scrollbarHandlingScrollGesture = scrollbar;
2110         if (eventSwallowed)
2111             return true;
2112     }
2113
2114     if (eventTarget && eventTarget->dispatchGestureEvent(gestureEvent))
2115         return true;
2116
2117     switch (gestureEvent.type()) {
2118     case PlatformEvent::GestureTap:
2119         return handleGestureTap(targetedEvent);
2120     case PlatformEvent::GestureShowPress:
2121         return handleGestureShowPress();
2122     case PlatformEvent::GestureLongPress:
2123         return handleGestureLongPress(targetedEvent);
2124     case PlatformEvent::GestureLongTap:
2125         return handleGestureLongTap(targetedEvent);
2126     case PlatformEvent::GestureTwoFingerTap:
2127         return sendContextMenuEventForGesture(targetedEvent);
2128     case PlatformEvent::GestureTapDown:
2129     case PlatformEvent::GesturePinchBegin:
2130     case PlatformEvent::GesturePinchEnd:
2131     case PlatformEvent::GesturePinchUpdate:
2132     case PlatformEvent::GestureTapDownCancel:
2133     case PlatformEvent::GestureTapUnconfirmed:
2134         break;
2135     default:
2136         ASSERT_NOT_REACHED();
2137     }
2138
2139     return false;
2140 }
2141
2142 bool EventHandler::handleGestureScrollEvent(const PlatformGestureEvent& gestureEvent)
2143 {
2144     TRACE_EVENT0("input", "EventHandler::handleGestureScrollEvent");
2145
2146     RefPtrWillBeRawPtr<Node> eventTarget = nullptr;
2147     RefPtr<Scrollbar> scrollbar;
2148     if (gestureEvent.type() != PlatformEvent::GestureScrollBegin) {
2149         scrollbar = m_scrollbarHandlingScrollGesture.get();
2150         eventTarget = m_scrollGestureHandlingNode.get();
2151     }
2152
2153     if (!eventTarget) {
2154         Document* document = m_frame->document();
2155         if (!document->renderView())
2156             return false;
2157
2158         FrameView* view = m_frame->view();
2159         LayoutPoint viewPoint = view->windowToContents(gestureEvent.position());
2160         HitTestRequest request(HitTestRequest::ReadOnly);
2161         HitTestResult result(viewPoint);
2162         document->renderView()->hitTest(request, result);
2163
2164         eventTarget = result.innerNode();
2165
2166         m_lastGestureScrollOverWidget = result.isOverWidget();
2167         m_scrollGestureHandlingNode = eventTarget;
2168         m_previousGestureScrolledNode = nullptr;
2169
2170         if (!scrollbar)
2171             scrollbar = result.scrollbar();
2172     }
2173
2174     if (scrollbar) {
2175         bool eventSwallowed = scrollbar->gestureEvent(gestureEvent);
2176         if (gestureEvent.type() == PlatformEvent::GestureScrollEnd
2177             || gestureEvent.type() == PlatformEvent::GestureFlingStart
2178             || !eventSwallowed) {
2179             m_scrollbarHandlingScrollGesture = nullptr;
2180         }
2181         if (eventSwallowed)
2182             return true;
2183     }
2184
2185     if (eventTarget) {
2186         bool eventSwallowed = handleScrollGestureOnResizer(eventTarget.get(), gestureEvent);
2187         if (!eventSwallowed)
2188             eventSwallowed = eventTarget->dispatchGestureEvent(gestureEvent);
2189         if (eventSwallowed)
2190             return true;
2191     }
2192
2193     switch (gestureEvent.type()) {
2194     case PlatformEvent::GestureScrollBegin:
2195         return handleGestureScrollBegin(gestureEvent);
2196     case PlatformEvent::GestureScrollUpdate:
2197     case PlatformEvent::GestureScrollUpdateWithoutPropagation:
2198         return handleGestureScrollUpdate(gestureEvent);
2199     case PlatformEvent::GestureScrollEnd:
2200         return handleGestureScrollEnd(gestureEvent);
2201     case PlatformEvent::GestureFlingStart:
2202     case PlatformEvent::GesturePinchBegin:
2203     case PlatformEvent::GesturePinchEnd:
2204     case PlatformEvent::GesturePinchUpdate:
2205         return false;
2206     default:
2207         ASSERT_NOT_REACHED();
2208         return false;
2209     }
2210 }
2211
2212 bool EventHandler::handleGestureTap(const GestureEventWithHitTestResults& targetedEvent)
2213 {
2214     RefPtr<FrameView> protector(m_frame->view());
2215     const PlatformGestureEvent& gestureEvent = targetedEvent.event();
2216     HitTestRequest::HitTestRequestType hitType = getHitTypeForGestureType(gestureEvent.type());
2217
2218     UserGestureIndicator gestureIndicator(DefinitelyProcessingUserGesture);
2219
2220     unsigned modifierFlags = 0;
2221     if (gestureEvent.altKey())
2222         modifierFlags |= PlatformEvent::AltKey;
2223     if (gestureEvent.ctrlKey())
2224         modifierFlags |= PlatformEvent::CtrlKey;
2225     if (gestureEvent.metaKey())
2226         modifierFlags |= PlatformEvent::MetaKey;
2227     if (gestureEvent.shiftKey())
2228         modifierFlags |= PlatformEvent::ShiftKey;
2229     PlatformEvent::Modifiers modifiers = static_cast<PlatformEvent::Modifiers>(modifierFlags);
2230
2231     HitTestResult currentHitTest = targetedEvent.hitTestResult();
2232
2233     // We use the adjusted position so the application isn't surprised to see a event with
2234     // co-ordinates outside the target's bounds.
2235     IntPoint adjustedPoint = m_frame->view()->windowToContents(gestureEvent.position());
2236
2237     PlatformMouseEvent fakeMouseMove(adjustedPoint, gestureEvent.globalPosition(),
2238         NoButton, PlatformEvent::MouseMoved, /* clickCount */ 0,
2239         modifiers, PlatformMouseEvent::FromTouch, gestureEvent.timestamp());
2240     dispatchMouseEvent(EventTypeNames::mousemove, currentHitTest.innerNode(), 0, fakeMouseMove, true);
2241
2242     // Do a new hit-test in case the mousemove event changed the DOM.
2243     // Note that if the original hit test wasn't over an element (eg. was over a scrollbar) we
2244     // don't want to re-hit-test because it may be in the wrong frame (and there's no way the page
2245     // could have seen the event anyway).
2246     // FIXME: Use a hit-test cache to avoid unnecessary hit tests. http://crbug.com/398920
2247     if (currentHitTest.innerNode())
2248         currentHitTest = hitTestResultInFrame(m_frame, adjustedPoint, hitType);
2249     m_clickNode = currentHitTest.innerNode();
2250     if (m_clickNode && m_clickNode->isTextNode())
2251         m_clickNode = NodeRenderingTraversal::parent(m_clickNode.get());
2252
2253     PlatformMouseEvent fakeMouseDown(adjustedPoint, gestureEvent.globalPosition(),
2254         LeftButton, PlatformEvent::MousePressed, gestureEvent.tapCount(),
2255         modifiers, PlatformMouseEvent::FromTouch,  gestureEvent.timestamp());
2256     bool swallowMouseDownEvent = !dispatchMouseEvent(EventTypeNames::mousedown, currentHitTest.innerNode(), gestureEvent.tapCount(), fakeMouseDown, true);
2257     if (!swallowMouseDownEvent)
2258         swallowMouseDownEvent = handleMouseFocus(fakeMouseDown);
2259     if (!swallowMouseDownEvent)
2260         swallowMouseDownEvent = handleMousePressEvent(MouseEventWithHitTestResults(fakeMouseDown, currentHitTest));
2261
2262     // FIXME: Use a hit-test cache to avoid unnecessary hit tests. http://crbug.com/398920
2263     if (currentHitTest.innerNode())
2264         currentHitTest = hitTestResultInFrame(m_frame, adjustedPoint, hitType);
2265     PlatformMouseEvent fakeMouseUp(adjustedPoint, gestureEvent.globalPosition(),
2266         LeftButton, PlatformEvent::MouseReleased, gestureEvent.tapCount(),
2267         modifiers, PlatformMouseEvent::FromTouch,  gestureEvent.timestamp());
2268     bool swallowMouseUpEvent = !dispatchMouseEvent(EventTypeNames::mouseup, currentHitTest.innerNode(), gestureEvent.tapCount(), fakeMouseUp, false);
2269
2270     bool swallowClickEvent = false;
2271     if (m_clickNode) {
2272         if (currentHitTest.innerNode()) {
2273             Node* clickTargetNode = currentHitTest.innerNode()->commonAncestor(*m_clickNode, parentForClickEvent);
2274             swallowClickEvent = !dispatchMouseEvent(EventTypeNames::click, clickTargetNode, gestureEvent.tapCount(), fakeMouseUp, true);
2275         }
2276         m_clickNode = nullptr;
2277     }
2278
2279     if (!swallowMouseUpEvent)
2280         swallowMouseUpEvent = handleMouseReleaseEvent(MouseEventWithHitTestResults(fakeMouseUp, currentHitTest));
2281
2282     return swallowMouseDownEvent | swallowMouseUpEvent | swallowClickEvent;
2283 }
2284
2285 bool EventHandler::handleGestureLongPress(const GestureEventWithHitTestResults& targetedEvent)
2286 {
2287     const PlatformGestureEvent& gestureEvent = targetedEvent.event();
2288     IntPoint adjustedPoint = gestureEvent.position();
2289
2290     // FIXME: Ideally we should try to remove the extra mouse-specific hit-tests here (re-using the
2291     // supplied HitTestResult), but that will require some overhaul of the touch drag-and-drop code
2292     // and LongPress is such a special scenario that it's unlikely to matter much in practice.
2293
2294     m_longTapShouldInvokeContextMenu = false;
2295     if (m_frame->settings() && m_frame->settings()->touchDragDropEnabled() && m_frame->view()) {
2296         PlatformMouseEvent mouseDownEvent(adjustedPoint, gestureEvent.globalPosition(), LeftButton, PlatformEvent::MousePressed, 1,
2297             gestureEvent.shiftKey(), gestureEvent.ctrlKey(), gestureEvent.altKey(), gestureEvent.metaKey(), PlatformMouseEvent::FromTouch, WTF::currentTime());
2298         m_mouseDown = mouseDownEvent;
2299
2300         PlatformMouseEvent mouseDragEvent(adjustedPoint, gestureEvent.globalPosition(), LeftButton, PlatformEvent::MouseMoved, 1,
2301             gestureEvent.shiftKey(), gestureEvent.ctrlKey(), gestureEvent.altKey(), gestureEvent.metaKey(), PlatformMouseEvent::FromTouch, WTF::currentTime());
2302         HitTestRequest request(HitTestRequest::ReadOnly);
2303         MouseEventWithHitTestResults mev = prepareMouseEvent(request, mouseDragEvent);
2304         m_didStartDrag = false;
2305         m_mouseDownMayStartDrag = true;
2306         dragState().m_dragSrc = nullptr;
2307         m_mouseDownPos = m_frame->view()->windowToContents(mouseDragEvent.position());
2308         RefPtr<FrameView> protector(m_frame->view());
2309         handleDrag(mev, DontCheckDragHysteresis);
2310         if (m_didStartDrag) {
2311             m_longTapShouldInvokeContextMenu = true;
2312             return true;
2313         }
2314     }
2315 #if OS(ANDROID)
2316     bool shouldLongPressSelectWord = true;
2317 #else
2318     bool shouldLongPressSelectWord = m_frame->settings() && m_frame->settings()->touchEditingEnabled();
2319 #endif
2320     if (shouldLongPressSelectWord) {
2321         IntPoint hitTestPoint = m_frame->view()->windowToContents(gestureEvent.position());
2322         HitTestResult result = hitTestResultAtPoint(hitTestPoint);
2323         Node* innerNode = result.innerNode();
2324         if (!result.isLiveLink() && innerNode && (innerNode->isContentEditable() || innerNode->isTextNode())) {
2325             selectClosestWordFromHitTestResult(result, DontAppendTrailingWhitespace);
2326             if (m_frame->selection().isRange()) {
2327                 focusDocumentView();
2328                 return true;
2329             }
2330         }
2331     }
2332     return sendContextMenuEventForGesture(targetedEvent);
2333 }
2334
2335 bool EventHandler::handleGestureLongTap(const GestureEventWithHitTestResults& targetedEvent)
2336 {
2337 #if !OS(ANDROID)
2338     if (m_longTapShouldInvokeContextMenu) {
2339         m_longTapShouldInvokeContextMenu = false;
2340         return sendContextMenuEventForGesture(targetedEvent);
2341     }
2342 #endif
2343     return false;
2344 }
2345
2346 bool EventHandler::handleScrollGestureOnResizer(Node* eventTarget, const PlatformGestureEvent& gestureEvent) {
2347     if (gestureEvent.type() == PlatformEvent::GestureScrollBegin) {
2348         RenderLayer* layer = eventTarget->renderer() ? eventTarget->renderer()->enclosingLayer() : 0;
2349         IntPoint p = m_frame->view()->windowToContents(gestureEvent.position());
2350         if (layer && layer->scrollableArea() && layer->scrollableArea()->isPointInResizeControl(p, ResizerForTouch)) {
2351             m_resizeScrollableArea = layer->scrollableArea();
2352             m_resizeScrollableArea->setInResizeMode(true);
2353             m_offsetFromResizeCorner = m_resizeScrollableArea->offsetFromResizeCorner(p);
2354             return true;
2355         }
2356     } else if (gestureEvent.type() == PlatformEvent::GestureScrollUpdate ||
2357                gestureEvent.type() == PlatformEvent::GestureScrollUpdateWithoutPropagation) {
2358         if (m_resizeScrollableArea && m_resizeScrollableArea->inResizeMode()) {
2359             m_resizeScrollableArea->resize(gestureEvent, m_offsetFromResizeCorner);
2360             return true;
2361         }
2362     } else if (gestureEvent.type() == PlatformEvent::GestureScrollEnd) {
2363         if (m_resizeScrollableArea && m_resizeScrollableArea->inResizeMode()) {
2364             m_resizeScrollableArea->setInResizeMode(false);
2365             m_resizeScrollableArea = 0;
2366             return false;
2367         }
2368     }
2369
2370     return false;
2371 }
2372
2373 bool EventHandler::passScrollGestureEventToWidget(const PlatformGestureEvent& gestureEvent, RenderObject* renderer)
2374 {
2375     ASSERT(gestureEvent.isScrollEvent());
2376
2377     if (!m_lastGestureScrollOverWidget)
2378         return false;
2379
2380     if (!renderer || !renderer->isWidget())
2381         return false;
2382
2383     Widget* widget = toRenderWidget(renderer)->widget();
2384
2385     if (!widget || !widget->isFrameView())
2386         return false;
2387
2388     return toFrameView(widget)->frame().eventHandler().handleGestureScrollEvent(gestureEvent);
2389 }
2390
2391 bool EventHandler::handleGestureScrollEnd(const PlatformGestureEvent& gestureEvent) {
2392     RefPtrWillBeRawPtr<Node> node = m_scrollGestureHandlingNode;
2393     clearGestureScrollNodes();
2394
2395     if (node)
2396         passScrollGestureEventToWidget(gestureEvent, node->renderer());
2397
2398     return false;
2399 }
2400
2401 bool EventHandler::handleGestureScrollBegin(const PlatformGestureEvent& gestureEvent)
2402 {
2403     Document* document = m_frame->document();
2404     if (!document->renderView())
2405         return false;
2406
2407     FrameView* view = m_frame->view();
2408     if (!view)
2409         return false;
2410
2411     // If there's no renderer on the node, send the event to the nearest ancestor with a renderer.
2412     // Needed for <option> and <optgroup> elements so we can touch scroll <select>s
2413     while (m_scrollGestureHandlingNode && !m_scrollGestureHandlingNode->renderer())
2414         m_scrollGestureHandlingNode = m_scrollGestureHandlingNode->parentOrShadowHostNode();
2415
2416     if (!m_scrollGestureHandlingNode)
2417         return false;
2418
2419     passScrollGestureEventToWidget(gestureEvent, m_scrollGestureHandlingNode->renderer());
2420
2421     return true;
2422 }
2423
2424 bool EventHandler::handleGestureScrollUpdate(const PlatformGestureEvent& gestureEvent)
2425 {
2426     FloatSize delta(gestureEvent.deltaX(), gestureEvent.deltaY());
2427     if (delta.isZero())
2428         return false;
2429
2430     const float scaleFactor = m_frame->pageZoomFactor();
2431     delta.scale(1 / scaleFactor, 1 / scaleFactor);
2432
2433     Node* node = m_scrollGestureHandlingNode.get();
2434     if (!node)
2435         return sendScrollEventToView(gestureEvent, delta);
2436
2437     // Ignore this event if the targeted node does not have a valid renderer.
2438     RenderObject* renderer = node->renderer();
2439     if (!renderer)
2440         return false;
2441
2442     RefPtr<FrameView> protector(m_frame->view());
2443
2444     Node* stopNode = 0;
2445     bool scrollShouldNotPropagate = gestureEvent.type() == PlatformEvent::GestureScrollUpdateWithoutPropagation;
2446
2447     // Try to send the event to the correct view.
2448     if (passScrollGestureEventToWidget(gestureEvent, renderer)) {
2449         if(scrollShouldNotPropagate)
2450               m_previousGestureScrolledNode = m_scrollGestureHandlingNode;
2451
2452         return true;
2453     }
2454
2455     if (scrollShouldNotPropagate)
2456         stopNode = m_previousGestureScrolledNode.get();
2457
2458     // First try to scroll the closest scrollable RenderBox ancestor of |node|.
2459     ScrollGranularity granularity = ScrollByPixel;
2460     bool horizontalScroll = scroll(ScrollLeft, granularity, node, &stopNode, delta.width());
2461     bool verticalScroll = scroll(ScrollUp, granularity, node, &stopNode, delta.height());
2462
2463     if (scrollShouldNotPropagate)
2464         m_previousGestureScrolledNode = stopNode;
2465
2466     if (horizontalScroll || verticalScroll) {
2467         setFrameWasScrolledByUser();
2468         return true;
2469     }
2470
2471     // Otherwise try to scroll the view.
2472     return sendScrollEventToView(gestureEvent, delta);
2473 }
2474
2475 bool EventHandler::sendScrollEventToView(const PlatformGestureEvent& gestureEvent, const FloatSize& scaledDelta)
2476 {
2477     FrameView* view = m_frame->view();
2478     if (!view)
2479         return false;
2480
2481     const float tickDivisor = static_cast<float>(WheelEvent::TickMultiplier);
2482     IntPoint point(gestureEvent.position().x(), gestureEvent.position().y());
2483     IntPoint globalPoint(gestureEvent.globalPosition().x(), gestureEvent.globalPosition().y());
2484     PlatformWheelEvent syntheticWheelEvent(point, globalPoint,
2485         scaledDelta.width(), scaledDelta.height(),
2486         scaledDelta.width() / tickDivisor, scaledDelta.height() / tickDivisor,
2487         ScrollByPixelWheelEvent,
2488         gestureEvent.shiftKey(), gestureEvent.ctrlKey(), gestureEvent.altKey(), gestureEvent.metaKey());
2489     syntheticWheelEvent.setHasPreciseScrollingDeltas(true);
2490
2491     bool scrolledFrame = view->wheelEvent(syntheticWheelEvent);
2492     if (scrolledFrame)
2493         setFrameWasScrolledByUser();
2494
2495     return scrolledFrame;
2496 }
2497
2498 void EventHandler::clearGestureScrollNodes()
2499 {
2500     m_scrollGestureHandlingNode = nullptr;
2501     m_previousGestureScrolledNode = nullptr;
2502 }
2503
2504 bool EventHandler::isScrollbarHandlingGestures() const
2505 {
2506     return m_scrollbarHandlingScrollGesture.get();
2507 }
2508
2509 bool EventHandler::shouldApplyTouchAdjustment(const PlatformGestureEvent& event) const
2510 {
2511     if (m_frame->settings() && !m_frame->settings()->touchAdjustmentEnabled())
2512         return false;
2513     return !event.area().isEmpty();
2514 }
2515
2516 bool EventHandler::bestClickableNodeForHitTestResult(const HitTestResult& result, IntPoint& targetPoint, Node*& targetNode)
2517 {
2518     // FIXME: Unify this with the other best* functions which are very similar.
2519
2520     TRACE_EVENT0("input", "EventHandler::bestClickableNodeForHitTestResult");
2521     ASSERT(result.isRectBasedTest());
2522
2523     // If the touch is over a scrollbar, don't adjust the touch point since touch adjustment only takes into account
2524     // DOM nodes so a touch over a scrollbar will be adjusted towards nearby nodes. This leads to things like textarea
2525     // scrollbars being untouchable.
2526     if (result.scrollbar())
2527         return false;
2528
2529     IntPoint touchCenter = m_frame->view()->contentsToWindow(result.roundedPointInMainFrame());
2530     IntRect touchRect = m_frame->view()->contentsToWindow(result.hitTestLocation().boundingBox());
2531
2532     WillBeHeapVector<RefPtrWillBeMember<Node>, 11> nodes;
2533     copyToVector(result.rectBasedTestResult(), nodes);
2534
2535     // FIXME: the explicit Vector conversion copies into a temporary and is wasteful.
2536     return findBestClickableCandidate(targetNode, targetPoint, touchCenter, touchRect, WillBeHeapVector<RefPtrWillBeMember<Node> > (nodes));
2537 }
2538
2539 bool EventHandler::bestContextMenuNodeForHitTestResult(const HitTestResult& result, IntPoint& targetPoint, Node*& targetNode)
2540 {
2541     ASSERT(result.isRectBasedTest());
2542     IntPoint touchCenter = m_frame->view()->contentsToWindow(result.roundedPointInMainFrame());
2543     IntRect touchRect = m_frame->view()->contentsToWindow(result.hitTestLocation().boundingBox());
2544     WillBeHeapVector<RefPtrWillBeMember<Node>, 11> nodes;
2545     copyToVector(result.rectBasedTestResult(), nodes);
2546
2547     // FIXME: the explicit Vector conversion copies into a temporary and is wasteful.
2548     return findBestContextMenuCandidate(targetNode, targetPoint, touchCenter, touchRect, WillBeHeapVector<RefPtrWillBeMember<Node> >(nodes));
2549 }
2550
2551 bool EventHandler::bestZoomableAreaForTouchPoint(const IntPoint& touchCenter, const IntSize& touchRadius, IntRect& targetArea, Node*& targetNode)
2552 {
2553     IntPoint hitTestPoint = m_frame->view()->windowToContents(touchCenter);
2554     HitTestResult result = hitTestResultAtPoint(hitTestPoint, HitTestRequest::ReadOnly | HitTestRequest::Active, touchRadius);
2555
2556     IntRect touchRect(touchCenter - touchRadius, touchRadius + touchRadius);
2557     WillBeHeapVector<RefPtrWillBeMember<Node>, 11> nodes;
2558     copyToVector(result.rectBasedTestResult(), nodes);
2559
2560     // FIXME: the explicit Vector conversion copies into a temporary and is wasteful.
2561     return findBestZoomableArea(targetNode, targetArea, touchCenter, touchRect, WillBeHeapVector<RefPtrWillBeMember<Node> >(nodes));
2562 }
2563
2564 GestureEventWithHitTestResults EventHandler::targetGestureEvent(const PlatformGestureEvent& gestureEvent, bool readOnly)
2565 {
2566     TRACE_EVENT0("input", "EventHandler::targetGestureEvent");
2567
2568     ASSERT(m_frame == m_frame->localFrameRoot());
2569     // Scrolling events get hit tested per frame (like wheel events do).
2570     ASSERT(!gestureEvent.isScrollEvent());
2571
2572     HitTestRequest::HitTestRequestType hitType = getHitTypeForGestureType(gestureEvent.type());
2573     double activeInterval = 0;
2574     bool shouldKeepActiveForMinInterval = false;
2575     if (readOnly) {
2576         hitType |= HitTestRequest::ReadOnly;
2577     } else if (gestureEvent.type() == PlatformEvent::GestureTap) {
2578         // If the Tap is received very shortly after ShowPress, we want to
2579         // delay clearing of the active state so that it's visible to the user
2580         // for at least a couple of frames.
2581         activeInterval = WTF::currentTime() - m_lastShowPressTimestamp;
2582         shouldKeepActiveForMinInterval = m_lastShowPressTimestamp && activeInterval < minimumActiveInterval;
2583         if (shouldKeepActiveForMinInterval)
2584             hitType |= HitTestRequest::ReadOnly;
2585     }
2586
2587     // Perform the rect-based hit-test (or point-based if adjustment is disabled). Note that
2588     // we don't yet apply hover/active state here because we need to resolve touch adjustment
2589     // first so that we apply hover/active it to the final adjusted node.
2590     IntPoint hitTestPoint = m_frame->view()->windowToContents(gestureEvent.position());
2591     LayoutSize padding;
2592     if (shouldApplyTouchAdjustment(gestureEvent)) {
2593         padding = gestureEvent.area();
2594         padding.scale(1.f / 2);
2595     }
2596     HitTestResult hitTestResult = hitTestResultAtPoint(hitTestPoint, hitType | HitTestRequest::ReadOnly, padding);
2597
2598     // Adjust the location of the gesture to the most likely nearby node, as appropriate for the
2599     // type of event.
2600     PlatformGestureEvent adjustedEvent = gestureEvent;
2601     applyTouchAdjustment(&adjustedEvent, &hitTestResult);
2602
2603     // Do a new hit-test at the (adjusted) gesture co-ordinates. This is necessary because
2604     // rect-based hit testing and touch adjustment sometimes return a different node than
2605     // what a point-based hit test would return for the same point.
2606     // FIXME: Fix touch adjustment to avoid the need for a redundant hit test. http://crbug.com/398914
2607     if (shouldApplyTouchAdjustment(gestureEvent)) {
2608         LocalFrame* hitFrame = hitTestResult.innerNodeFrame();
2609         if (!hitFrame)
2610             hitFrame = m_frame;
2611         hitTestResult = hitTestResultInFrame(hitFrame, hitFrame->view()->windowToContents(adjustedEvent.position()), hitType | HitTestRequest::ReadOnly);
2612     }
2613
2614     // If we did a rect-based hit test it must be resolved to the best single node by now to
2615     // ensure consumers don't accidentally use one of the other candidates.
2616     ASSERT(!hitTestResult.isRectBasedTest());
2617
2618     // Now apply hover/active state to the final target.
2619     // FIXME: This is supposed to send mouseenter/mouseleave events, but doesn't because we
2620     // aren't passing a PlatformMouseEvent.
2621     HitTestRequest request(hitType | HitTestRequest::AllowChildFrameContent);
2622     if (!request.readOnly())
2623         m_frame->document()->updateHoverActiveState(request, hitTestResult.innerElement());
2624
2625     if (shouldKeepActiveForMinInterval) {
2626         m_lastDeferredTapElement = hitTestResult.innerElement();
2627         m_activeIntervalTimer.startOneShot(minimumActiveInterval - activeInterval, FROM_HERE);
2628     }
2629
2630     return GestureEventWithHitTestResults(adjustedEvent, hitTestResult);
2631 }
2632
2633 HitTestRequest::HitTestRequestType EventHandler::getHitTypeForGestureType(PlatformEvent::Type type)
2634 {
2635     HitTestRequest::HitTestRequestType hitType = HitTestRequest::TouchEvent;
2636     switch (type) {
2637     case PlatformEvent::GestureShowPress:
2638     case PlatformEvent::GestureTapUnconfirmed:
2639         return hitType | HitTestRequest::Active;
2640     case PlatformEvent::GestureTapDownCancel:
2641         // A TapDownCancel received when no element is active shouldn't really be changing hover state.
2642         if (!m_frame->document()->activeHoverElement())
2643             hitType |= HitTestRequest::ReadOnly;
2644         return hitType | HitTestRequest::Release;
2645     case PlatformEvent::GestureTap:
2646         return hitType | HitTestRequest::Release;
2647     case PlatformEvent::GestureTapDown:
2648     case PlatformEvent::GestureLongPress:
2649     case PlatformEvent::GestureLongTap:
2650     case PlatformEvent::GestureTwoFingerTap:
2651         // FIXME: Shouldn't LongTap and TwoFingerTap clear the Active state?
2652         return hitType | HitTestRequest::Active | HitTestRequest::ReadOnly;
2653     default:
2654         ASSERT_NOT_REACHED();
2655         return hitType | HitTestRequest::Active | HitTestRequest::ReadOnly;
2656     }
2657 }
2658
2659 void EventHandler::applyTouchAdjustment(PlatformGestureEvent* gestureEvent, HitTestResult* hitTestResult)
2660 {
2661     if (!shouldApplyTouchAdjustment(*gestureEvent))
2662         return;
2663
2664     Node* adjustedNode = 0;
2665     IntPoint adjustedPoint = gestureEvent->position();
2666     IntSize radius = gestureEvent->area();
2667     radius.scale(1.f / 2);
2668     bool adjusted = false;
2669     switch (gestureEvent->type()) {
2670     case PlatformEvent::GestureTap:
2671     case PlatformEvent::GestureTapUnconfirmed:
2672     case PlatformEvent::GestureTapDown:
2673     case PlatformEvent::GestureShowPress:
2674         adjusted = bestClickableNodeForHitTestResult(*hitTestResult, adjustedPoint, adjustedNode);
2675         break;
2676     case PlatformEvent::GestureLongPress:
2677     case PlatformEvent::GestureLongTap:
2678     case PlatformEvent::GestureTwoFingerTap:
2679         adjusted = bestContextMenuNodeForHitTestResult(*hitTestResult, adjustedPoint, adjustedNode);
2680         break;
2681     default:
2682         ASSERT_NOT_REACHED();
2683     }
2684
2685     // Update the hit-test result to be a point-based result instead of a rect-based result.
2686     // FIXME: We should do this even when no candidate matches the node filter. crbug.com/398914
2687     if (adjusted) {
2688         hitTestResult->resolveRectBasedTest(adjustedNode, m_frame->view()->windowToContents(adjustedPoint));
2689         gestureEvent->applyTouchAdjustment(adjustedPoint);
2690     }
2691 }
2692
2693 bool EventHandler::sendContextMenuEvent(const PlatformMouseEvent& event)
2694 {
2695     Document* doc = m_frame->document();
2696     FrameView* v = m_frame->view();
2697     if (!v)
2698         return false;
2699
2700     // Clear mouse press state to avoid initiating a drag while context menu is up.
2701     m_mousePressed = false;
2702     LayoutPoint viewportPos = v->windowToContents(event.position());
2703     HitTestRequest request(HitTestRequest::Active);
2704     MouseEventWithHitTestResults mev = doc->prepareMouseEvent(request, viewportPos, event);
2705
2706     if (!m_frame->selection().contains(viewportPos)
2707         && !mev.scrollbar()
2708         // FIXME: In the editable case, word selection sometimes selects content that isn't underneath the mouse.
2709         // If the selection is non-editable, we do word selection to make it easier to use the contextual menu items
2710         // available for text selections.  But only if we're above text.
2711         && (m_frame->selection().isContentEditable() || (mev.innerNode() && mev.innerNode()->isTextNode()))) {
2712         m_mouseDownMayStartSelect = true; // context menu events are always allowed to perform a selection
2713
2714         if (mev.hitTestResult().isMisspelled())
2715             selectClosestMisspellingFromMouseEvent(mev);
2716         else if (m_frame->editor().behavior().shouldSelectOnContextualMenuClick())
2717             selectClosestWordOrLinkFromMouseEvent(mev);
2718     }
2719
2720     return !dispatchMouseEvent(EventTypeNames::contextmenu, mev.innerNode(), 0, event, false);
2721 }
2722
2723 bool EventHandler::sendContextMenuEventForKey()
2724 {
2725     FrameView* view = m_frame->view();
2726     if (!view)
2727         return false;
2728
2729     Document* doc = m_frame->document();
2730     if (!doc)
2731         return false;
2732
2733     // Clear mouse press state to avoid initiating a drag while context menu is up.
2734     m_mousePressed = false;
2735
2736     static const int kContextMenuMargin = 1;
2737
2738 #if OS(WIN)
2739     int rightAligned = ::GetSystemMetrics(SM_MENUDROPALIGNMENT);
2740 #else
2741     int rightAligned = 0;
2742 #endif
2743     IntPoint location;
2744
2745     Element* focusedElement = doc->focusedElement();
2746     FrameSelection& selection = m_frame->selection();
2747     Position start = selection.selection().start();
2748     bool shouldTranslateToRootView = true;
2749
2750     if (start.deprecatedNode() && (selection.rootEditableElement() || selection.isRange())) {
2751         RefPtrWillBeRawPtr<Range> selectionRange = selection.toNormalizedRange();
2752         IntRect firstRect = m_frame->editor().firstRectForRange(selectionRange.get());
2753
2754         int x = rightAligned ? firstRect.maxX() : firstRect.x();
2755         // In a multiline edit, firstRect.maxY() would endup on the next line, so -1.
2756         int y = firstRect.maxY() ? firstRect.maxY() - 1 : 0;
2757         location = IntPoint(x, y);
2758     } else if (focusedElement) {
2759         IntRect clippedRect = focusedElement->boundsInRootViewSpace();
2760         location = IntPoint(clippedRect.center());
2761     } else {
2762         location = IntPoint(
2763             rightAligned ? view->contentsWidth() - kContextMenuMargin : kContextMenuMargin,
2764             kContextMenuMargin);
2765         shouldTranslateToRootView = false;
2766     }
2767
2768     m_frame->view()->setCursor(pointerCursor());
2769
2770     IntPoint position = shouldTranslateToRootView ? view->contentsToRootView(location) : location;
2771     IntPoint globalPosition = view->hostWindow()->rootViewToScreen(IntRect(position, IntSize())).location();
2772
2773     Node* targetNode = doc->focusedElement();
2774     if (!targetNode)
2775         targetNode = doc;
2776
2777     // Use the focused node as the target for hover and active.
2778     HitTestResult result(position);
2779     result.setInnerNode(targetNode);
2780     doc->updateHoverActiveState(HitTestRequest::Active, result.innerElement());
2781
2782     // The contextmenu event is a mouse event even when invoked using the keyboard.
2783     // This is required for web compatibility.
2784
2785 #if OS(WIN)
2786     PlatformEvent::Type eventType = PlatformEvent::MouseReleased;
2787 #else
2788     PlatformEvent::Type eventType = PlatformEvent::MousePressed;
2789 #endif
2790
2791     PlatformMouseEvent mouseEvent(position, globalPosition, RightButton, eventType, 1, false, false, false, false, PlatformMouseEvent::RealOrIndistinguishable, WTF::currentTime());
2792
2793     handleMousePressEvent(mouseEvent);
2794     return sendContextMenuEvent(mouseEvent);
2795 }
2796
2797 bool EventHandler::sendContextMenuEventForGesture(const GestureEventWithHitTestResults& targetedEvent)
2798 {
2799 #if OS(WIN)
2800     PlatformEvent::Type eventType = PlatformEvent::MouseReleased;
2801 #else
2802     PlatformEvent::Type eventType = PlatformEvent::MousePressed;
2803 #endif
2804
2805     PlatformMouseEvent mouseEvent(targetedEvent.event().position(), targetedEvent.event().globalPosition(), RightButton, eventType, 1, false, false, false, false, PlatformMouseEvent::FromTouch, WTF::currentTime());
2806     // To simulate right-click behavior, we send a right mouse down and then
2807     // context menu event.
2808     // FIXME: Send HitTestResults to avoid redundant hit tests.
2809     handleMousePressEvent(mouseEvent);
2810     return sendContextMenuEvent(mouseEvent);
2811     // We do not need to send a corresponding mouse release because in case of
2812     // right-click, the context menu takes capture and consumes all events.
2813 }
2814
2815 void EventHandler::scheduleHoverStateUpdate()
2816 {
2817     if (!m_hoverTimer.isActive())
2818         m_hoverTimer.startOneShot(0, FROM_HERE);
2819 }
2820
2821 void EventHandler::scheduleCursorUpdate()
2822 {
2823     if (!m_cursorUpdateTimer.isActive())
2824         m_cursorUpdateTimer.startOneShot(cursorUpdateInterval, FROM_HERE);
2825 }
2826
2827 void EventHandler::dispatchFakeMouseMoveEventSoon()
2828 {
2829     if (m_mousePressed)
2830         return;
2831
2832     if (m_mousePositionIsUnknown)
2833         return;
2834
2835     Settings* settings = m_frame->settings();
2836     if (settings && !settings->deviceSupportsMouse())
2837         return;
2838
2839     // If the content has ever taken longer than fakeMouseMoveShortInterval we
2840     // reschedule the timer and use a longer time. This will cause the content
2841     // to receive these moves only after the user is done scrolling, reducing
2842     // pauses during the scroll.
2843     if (m_maxMouseMovedDuration > fakeMouseMoveShortInterval) {
2844         if (m_fakeMouseMoveEventTimer.isActive())
2845             m_fakeMouseMoveEventTimer.stop();
2846         m_fakeMouseMoveEventTimer.startOneShot(fakeMouseMoveLongInterval, FROM_HERE);
2847     } else {
2848         if (!m_fakeMouseMoveEventTimer.isActive())
2849             m_fakeMouseMoveEventTimer.startOneShot(fakeMouseMoveShortInterval, FROM_HERE);
2850     }
2851 }
2852
2853 void EventHandler::dispatchFakeMouseMoveEventSoonInQuad(const FloatQuad& quad)
2854 {
2855     FrameView* view = m_frame->view();
2856     if (!view)
2857         return;
2858
2859     if (!quad.containsPoint(view->windowToContents(m_lastKnownMousePosition)))
2860         return;
2861
2862     dispatchFakeMouseMoveEventSoon();
2863 }
2864
2865 void EventHandler::fakeMouseMoveEventTimerFired(Timer<EventHandler>* timer)
2866 {
2867     ASSERT_UNUSED(timer, timer == &m_fakeMouseMoveEventTimer);
2868     ASSERT(!m_mousePressed);
2869
2870     Settings* settings = m_frame->settings();
2871     if (settings && !settings->deviceSupportsMouse())
2872         return;
2873
2874     FrameView* view = m_frame->view();
2875     if (!view)
2876         return;
2877
2878     if (!m_frame->page() || !m_frame->page()->focusController().isActive())
2879         return;
2880
2881     // Don't dispatch a synthetic mouse move event if the mouse cursor is not visible to the user.
2882     if (!isCursorVisible())
2883         return;
2884
2885     bool shiftKey;
2886     bool ctrlKey;
2887     bool altKey;
2888     bool metaKey;
2889     PlatformKeyboardEvent::getCurrentModifierState(shiftKey, ctrlKey, altKey, metaKey);
2890     PlatformMouseEvent fakeMouseMoveEvent(m_lastKnownMousePosition, m_lastKnownMouseGlobalPosition, NoButton, PlatformEvent::MouseMoved, 0, shiftKey, ctrlKey, altKey, metaKey, PlatformMouseEvent::RealOrIndistinguishable, currentTime());
2891     handleMouseMoveEvent(fakeMouseMoveEvent);
2892 }
2893
2894 void EventHandler::cancelFakeMouseMoveEvent()
2895 {
2896     m_fakeMouseMoveEventTimer.stop();
2897 }
2898
2899 bool EventHandler::isCursorVisible() const
2900 {
2901     return m_frame->page()->isCursorVisible();
2902 }
2903
2904 void EventHandler::setResizingFrameSet(HTMLFrameSetElement* frameSet)
2905 {
2906     m_frameSetBeingResized = frameSet;
2907 }
2908
2909 void EventHandler::resizeScrollableAreaDestroyed()
2910 {
2911     ASSERT(m_resizeScrollableArea);
2912     m_resizeScrollableArea = 0;
2913 }
2914
2915 void EventHandler::hoverTimerFired(Timer<EventHandler>*)
2916 {
2917     m_hoverTimer.stop();
2918
2919     ASSERT(m_frame);
2920     ASSERT(m_frame->document());
2921
2922     if (RenderView* renderer = m_frame->contentRenderer()) {
2923         if (FrameView* view = m_frame->view()) {
2924             HitTestRequest request(HitTestRequest::Move);
2925             HitTestResult result(view->windowToContents(m_lastKnownMousePosition));
2926             renderer->hitTest(request, result);
2927             m_frame->document()->updateHoverActiveState(request, result.innerElement());
2928         }
2929     }
2930 }
2931
2932 void EventHandler::activeIntervalTimerFired(Timer<EventHandler>*)
2933 {
2934     m_activeIntervalTimer.stop();
2935
2936     if (m_frame
2937         && m_frame->document()
2938         && m_lastDeferredTapElement) {
2939         // FIXME: Enable condition when http://crbug.com/226842 lands
2940         // m_lastDeferredTapElement.get() == m_frame->document()->activeElement()
2941         HitTestRequest request(HitTestRequest::TouchEvent | HitTestRequest::Release);
2942         m_frame->document()->updateHoverActiveState(request, m_lastDeferredTapElement.get());
2943     }
2944     m_lastDeferredTapElement = nullptr;
2945 }
2946
2947 void EventHandler::notifyElementActivated()
2948 {
2949     // Since another element has been set to active, stop current timer and clear reference.
2950     if (m_activeIntervalTimer.isActive())
2951         m_activeIntervalTimer.stop();
2952     m_lastDeferredTapElement = nullptr;
2953 }
2954
2955 void EventHandler::notifySelectionChanged()
2956 {
2957     m_selectionInitiationState = ExtendedSelection;
2958 }
2959
2960 bool EventHandler::handleAccessKey(const PlatformKeyboardEvent& evt)
2961 {
2962     // FIXME: Ignoring the state of Shift key is what neither IE nor Firefox do.
2963     // IE matches lower and upper case access keys regardless of Shift key state - but if both upper and
2964     // lower case variants are present in a document, the correct element is matched based on Shift key state.
2965     // Firefox only matches an access key if Shift is not pressed, and does that case-insensitively.
2966     ASSERT(!(accessKeyModifiers() & PlatformEvent::ShiftKey));
2967     if ((evt.modifiers() & ~PlatformEvent::ShiftKey) != accessKeyModifiers())
2968         return false;
2969     String key = evt.unmodifiedText();
2970     Element* elem = m_frame->document()->getElementByAccessKey(key.lower());
2971     if (!elem)
2972         return false;
2973     elem->accessKeyAction(false);
2974     return true;
2975 }
2976
2977 bool EventHandler::isKeyEventAllowedInFullScreen(Fullscreen* fullscreen, const PlatformKeyboardEvent& keyEvent) const
2978 {
2979     if (fullscreen->webkitFullScreenKeyboardInputAllowed())
2980         return true;
2981
2982     if (keyEvent.type() == PlatformKeyboardEvent::Char) {
2983         if (keyEvent.text().length() != 1)
2984             return false;
2985         UChar character = keyEvent.text()[0];
2986         return character == ' ';
2987     }
2988
2989     int keyCode = keyEvent.windowsVirtualKeyCode();
2990     return (keyCode >= VK_BACK && keyCode <= VK_CAPITAL)
2991         || (keyCode >= VK_SPACE && keyCode <= VK_DELETE)
2992         || (keyCode >= VK_OEM_1 && keyCode <= VK_OEM_PLUS)
2993         || (keyCode >= VK_MULTIPLY && keyCode <= VK_OEM_8);
2994 }
2995
2996 bool EventHandler::keyEvent(const PlatformKeyboardEvent& initialKeyEvent)
2997 {
2998     RefPtr<FrameView> protector(m_frame->view());
2999
3000     ASSERT(m_frame->document());
3001     if (Fullscreen* fullscreen = Fullscreen::fromIfExists(*m_frame->document())) {
3002         if (fullscreen->webkitCurrentFullScreenElement() && !isKeyEventAllowedInFullScreen(fullscreen, initialKeyEvent)) {
3003             UseCounter::count(*m_frame->document(), UseCounter::KeyEventNotAllowedInFullScreen);
3004             return false;
3005         }
3006     }
3007
3008     if (initialKeyEvent.windowsVirtualKeyCode() == VK_CAPITAL)
3009         capsLockStateMayHaveChanged();
3010
3011 #if OS(WIN)
3012     if (panScrollInProgress()) {
3013         // If a key is pressed while the panScroll is in progress then we want to stop
3014         if (initialKeyEvent.type() == PlatformEvent::KeyDown || initialKeyEvent.type() == PlatformEvent::RawKeyDown)
3015             stopAutoscroll();
3016
3017         // If we were in panscroll mode, we swallow the key event
3018         return true;
3019     }
3020 #endif
3021
3022     // Check for cases where we are too early for events -- possible unmatched key up
3023     // from pressing return in the location bar.
3024     RefPtrWillBeRawPtr<Node> node = eventTargetNodeForDocument(m_frame->document());
3025     if (!node)
3026         return false;
3027
3028     UserGestureIndicator gestureIndicator(DefinitelyProcessingUserGesture);
3029
3030     // In IE, access keys are special, they are handled after default keydown processing, but cannot be canceled - this is hard to match.
3031     // On Mac OS X, we process them before dispatching keydown, as the default keydown handler implements Emacs key bindings, which may conflict
3032     // with access keys. Then we dispatch keydown, but suppress its default handling.
3033     // On Windows, WebKit explicitly calls handleAccessKey() instead of dispatching a keypress event for WM_SYSCHAR messages.
3034     // Other platforms currently match either Mac or Windows behavior, depending on whether they send combined KeyDown events.
3035     bool matchedAnAccessKey = false;
3036     if (initialKeyEvent.type() == PlatformEvent::KeyDown)
3037         matchedAnAccessKey = handleAccessKey(initialKeyEvent);
3038
3039     // FIXME: it would be fair to let an input method handle KeyUp events before DOM dispatch.
3040     if (initialKeyEvent.type() == PlatformEvent::KeyUp || initialKeyEvent.type() == PlatformEvent::Char)
3041         return !node->dispatchKeyEvent(initialKeyEvent);
3042
3043     PlatformKeyboardEvent keyDownEvent = initialKeyEvent;
3044     if (keyDownEvent.type() != PlatformEvent::RawKeyDown)
3045         keyDownEvent.disambiguateKeyDownEvent(PlatformEvent::RawKeyDown);
3046     RefPtrWillBeRawPtr<KeyboardEvent> keydown = KeyboardEvent::create(keyDownEvent, m_frame->document()->domWindow());
3047     if (matchedAnAccessKey)
3048         keydown->setDefaultPrevented(true);
3049     keydown->setTarget(node);
3050
3051     if (initialKeyEvent.type() == PlatformEvent::RawKeyDown) {
3052         node->dispatchEvent(keydown, IGNORE_EXCEPTION);
3053         // If frame changed as a result of keydown dispatch, then return true to avoid sending a subsequent keypress message to the new frame.
3054         bool changedFocusedFrame = m_frame->page() && m_frame != m_frame->page()->focusController().focusedOrMainFrame();
3055         return keydown->defaultHandled() || keydown->defaultPrevented() || changedFocusedFrame;
3056     }
3057
3058     node->dispatchEvent(keydown, IGNORE_EXCEPTION);
3059     // If frame changed as a result of keydown dispatch, then return early to avoid sending a subsequent keypress message to the new frame.
3060     bool changedFocusedFrame = m_frame->page() && m_frame != m_frame->page()->focusController().focusedOrMainFrame();
3061     bool keydownResult = keydown->defaultHandled() || keydown->defaultPrevented() || changedFocusedFrame;
3062     if (keydownResult)
3063         return keydownResult;
3064
3065     // Focus may have changed during keydown handling, so refetch node.
3066     // But if we are dispatching a fake backward compatibility keypress, then we pretend that the keypress happened on the original node.
3067     node = eventTargetNodeForDocument(m_frame->document());
3068     if (!node)
3069         return false;
3070
3071     PlatformKeyboardEvent keyPressEvent = initialKeyEvent;
3072     keyPressEvent.disambiguateKeyDownEvent(PlatformEvent::Char);
3073     if (keyPressEvent.text().isEmpty())
3074         return keydownResult;
3075     RefPtrWillBeRawPtr<KeyboardEvent> keypress = KeyboardEvent::create(keyPressEvent, m_frame->document()->domWindow());
3076     keypress->setTarget(node);
3077     if (keydownResult)
3078         keypress->setDefaultPrevented(true);
3079     node->dispatchEvent(keypress, IGNORE_EXCEPTION);
3080
3081     return keydownResult || keypress->defaultPrevented() || keypress->defaultHandled();
3082 }
3083
3084 static FocusType focusDirectionForKey(const AtomicString& keyIdentifier)
3085 {
3086     DEFINE_STATIC_LOCAL(AtomicString, Down, ("Down", AtomicString::ConstructFromLiteral));
3087     DEFINE_STATIC_LOCAL(AtomicString, Up, ("Up", AtomicString::ConstructFromLiteral));
3088     DEFINE_STATIC_LOCAL(AtomicString, Left, ("Left", AtomicString::ConstructFromLiteral));
3089     DEFINE_STATIC_LOCAL(AtomicString, Right, ("Right", AtomicString::ConstructFromLiteral));
3090
3091     FocusType retVal = FocusTypeNone;
3092
3093     if (keyIdentifier == Down)
3094         retVal = FocusTypeDown;
3095     else if (keyIdentifier == Up)
3096         retVal = FocusTypeUp;
3097     else if (keyIdentifier == Left)
3098         retVal = FocusTypeLeft;
3099     else if (keyIdentifier == Right)
3100         retVal = FocusTypeRight;
3101
3102     return retVal;
3103 }
3104
3105 void EventHandler::defaultKeyboardEventHandler(KeyboardEvent* event)
3106 {
3107     if (event->type() == EventTypeNames::keydown) {
3108         // Clear caret blinking suspended state to make sure that caret blinks
3109         // when we type again after long pressing on an empty input field.
3110         if (m_frame && m_frame->selection().isCaretBlinkingSuspended())
3111             m_frame->selection().setCaretBlinkingSuspended(false);
3112
3113         m_frame->editor().handleKeyboardEvent(event);
3114         if (event->defaultHandled())
3115             return;
3116         if (event->keyIdentifier() == "U+0009")
3117             defaultTabEventHandler(event);
3118         else if (event->keyIdentifier() == "U+0008")
3119             defaultBackspaceEventHandler(event);
3120         else if (event->keyIdentifier() == "U+001B")
3121             defaultEscapeEventHandler(event);
3122         else {
3123             FocusType type = focusDirectionForKey(AtomicString(event->keyIdentifier()));
3124             if (type != FocusTypeNone)
3125                 defaultArrowEventHandler(type, event);
3126         }
3127     }
3128     if (event->type() == EventTypeNames::keypress) {
3129         m_frame->editor().handleKeyboardEvent(event);
3130         if (event->defaultHandled())
3131             return;
3132         if (event->charCode() == ' ')
3133             defaultSpaceEventHandler(event);
3134     }
3135 }
3136
3137 bool EventHandler::dragHysteresisExceeded(const FloatPoint& floatDragViewportLocation) const
3138 {
3139     return dragHysteresisExceeded(flooredIntPoint(floatDragViewportLocation));
3140 }
3141
3142 bool EventHandler::dragHysteresisExceeded(const IntPoint& dragViewportLocation) const
3143 {
3144     FrameView* view = m_frame->view();
3145     if (!view)
3146         return false;
3147     IntPoint dragLocation = view->windowToContents(dragViewportLocation);
3148     IntSize delta = dragLocation - m_mouseDownPos;
3149
3150     int threshold = GeneralDragHysteresis;
3151     switch (dragState().m_dragType) {
3152     case DragSourceActionSelection:
3153         threshold = TextDragHysteresis;
3154         break;
3155     case DragSourceActionImage:
3156         threshold = ImageDragHysteresis;
3157         break;
3158     case DragSourceActionLink:
3159         threshold = LinkDragHysteresis;
3160         break;
3161     case DragSourceActionDHTML:
3162         break;
3163     case DragSourceActionNone:
3164         ASSERT_NOT_REACHED();
3165     }
3166
3167     return abs(delta.width()) >= threshold || abs(delta.height()) >= threshold;
3168 }
3169
3170 void EventHandler::clearDragDataTransfer()
3171 {
3172     if (dragState().m_dragDataTransfer) {
3173         dragState().m_dragDataTransfer->clearDragImage();
3174         dragState().m_dragDataTransfer->setAccessPolicy(DataTransferNumb);
3175     }
3176 }
3177
3178 void EventHandler::dragSourceEndedAt(const PlatformMouseEvent& event, DragOperation operation)
3179 {
3180     // Send a hit test request so that RenderLayer gets a chance to update the :hover and :active pseudoclasses.
3181     HitTestRequest request(HitTestRequest::Release);
3182     prepareMouseEvent(request, event);
3183
3184     if (dragState().m_dragSrc) {
3185         dragState().m_dragDataTransfer->setDestinationOperation(operation);
3186         // for now we don't care if event handler cancels default behavior, since there is none
3187         dispatchDragSrcEvent(EventTypeNames::dragend, event);
3188     }
3189     clearDragDataTransfer();
3190     dragState().m_dragSrc = nullptr;
3191     // In case the drag was ended due to an escape key press we need to ensure
3192     // that consecutive mousemove events don't reinitiate the drag and drop.
3193     m_mouseDownMayStartDrag = false;
3194 }
3195
3196 void EventHandler::updateDragStateAfterEditDragIfNeeded(Element* rootEditableElement)
3197 {
3198     // If inserting the dragged contents removed the drag source, we still want to fire dragend at the root editble element.
3199     if (dragState().m_dragSrc && !dragState().m_dragSrc->inDocument())
3200         dragState().m_dragSrc = rootEditableElement;
3201 }
3202
3203 // returns if we should continue "default processing", i.e., whether eventhandler canceled
3204 bool EventHandler::dispatchDragSrcEvent(const AtomicString& eventType, const PlatformMouseEvent& event)
3205 {
3206     return !dispatchDragEvent(eventType, dragState().m_dragSrc.get(), event, dragState().m_dragDataTransfer.get());
3207 }
3208
3209 bool EventHandler::handleDrag(const MouseEventWithHitTestResults& event, CheckDragHysteresis checkDragHysteresis)
3210 {
3211     ASSERT(event.event().type() == PlatformEvent::MouseMoved);
3212     // Callers must protect the reference to FrameView, since this function may dispatch DOM
3213     // events, causing page/FrameView to go away.
3214     ASSERT(m_frame);
3215     ASSERT(m_frame->view());
3216     if (!m_frame->page())
3217         return false;
3218
3219     if (event.event().button() != LeftButton || event.event().type() != PlatformEvent::MouseMoved) {
3220         // If we allowed the other side of the bridge to handle a drag
3221         // last time, then m_mousePressed might still be set. So we
3222         // clear it now to make sure the next move after a drag
3223         // doesn't look like a drag.
3224         m_mousePressed = false;
3225         return false;
3226     }
3227
3228     if (m_mouseDownMayStartDrag) {
3229         HitTestRequest request(HitTestRequest::ReadOnly);
3230         HitTestResult result(m_mouseDownPos);
3231         m_frame->contentRenderer()->hitTest(request, result);
3232         Node* node = result.innerNode();
3233         if (node) {
3234             DragController::SelectionDragPolicy selectionDragPolicy = event.event().timestamp() - m_mouseDownTimestamp < TextDragDelay
3235                 ? DragController::DelayedSelectionDragResolution
3236                 : DragController::ImmediateSelectionDragResolution;
3237             dragState().m_dragSrc = m_frame->page()->dragController().draggableNode(m_frame, node, m_mouseDownPos, selectionDragPolicy, dragState().m_dragType);
3238         } else {
3239             dragState().m_dragSrc = nullptr;
3240         }
3241
3242         if (!dragState().m_dragSrc)
3243             m_mouseDownMayStartDrag = false; // no element is draggable
3244     }
3245
3246     if (!m_mouseDownMayStartDrag)
3247         return !mouseDownMayStartSelect() && !m_mouseDownMayStartAutoscroll;
3248
3249     // We are starting a text/image/url drag, so the cursor should be an arrow
3250     // FIXME <rdar://7577595>: Custom cursors aren't supported during drag and drop (default to pointer).
3251     m_frame->view()->setCursor(pointerCursor());
3252
3253     if (checkDragHysteresis == ShouldCheckDragHysteresis && !dragHysteresisExceeded(event.event().position()))
3254         return true;
3255
3256     // Once we're past the hysteresis point, we don't want to treat this gesture as a click
3257     invalidateClick();
3258
3259     if (!tryStartDrag(event)) {
3260         // Something failed to start the drag, clean up.
3261         clearDragDataTransfer();
3262         dragState().m_dragSrc = nullptr;
3263     }
3264
3265     m_mouseDownMayStartDrag = false;
3266     // Whether or not the drag actually started, no more default handling (like selection).
3267     return true;
3268 }
3269
3270 bool EventHandler::tryStartDrag(const MouseEventWithHitTestResults& event)
3271 {
3272     // The DataTransfer would only be non-empty if we missed a dragEnd.
3273     // Clear it anyway, just to make sure it gets numbified.
3274     clearDragDataTransfer();
3275
3276     dragState().m_dragDataTransfer = createDraggingDataTransfer();
3277
3278     // Check to see if this a DOM based drag, if it is get the DOM specified drag
3279     // image and offset
3280     if (dragState().m_dragType == DragSourceActionDHTML) {
3281         if (RenderObject* renderer = dragState().m_dragSrc->renderer()) {
3282             FloatPoint absPos = renderer->localToAbsolute(FloatPoint(), UseTransforms);
3283             IntSize delta = m_mouseDownPos - roundedIntPoint(absPos);
3284             dragState().m_dragDataTransfer->setDragImageElement(dragState().m_dragSrc.get(), IntPoint(delta));
3285         } else {
3286             // The renderer has disappeared, this can happen if the onStartDrag handler has hidden
3287             // the element in some way. In this case we just kill the drag.
3288             return false;
3289         }
3290     }
3291
3292     DragController& dragController = m_frame->page()->dragController();
3293     if (!dragController.populateDragDataTransfer(m_frame, dragState(), m_mouseDownPos))
3294         return false;
3295
3296     // If dispatching dragstart brings about another mouse down -- one way
3297     // this will happen is if a DevTools user breaks within a dragstart
3298     // handler and then clicks on the suspended page -- the drag state is
3299     // reset. Hence, need to check if this particular drag operation can
3300     // continue even if dispatchEvent() indicates no (direct) cancellation.
3301     // Do that by checking if m_dragSrc is still set.
3302     m_mouseDownMayStartDrag = dispatchDragSrcEvent(EventTypeNames::dragstart, m_mouseDown)
3303         && !m_frame->selection().isInPasswordField() && dragState().m_dragSrc;
3304
3305     // Invalidate clipboard here against anymore pasteboard writing for security. The drag
3306     // image can still be changed as we drag, but not the pasteboard data.
3307     dragState().m_dragDataTransfer->setAccessPolicy(DataTransferImageWritable);
3308
3309     if (m_mouseDownMayStartDrag) {
3310         // Dispatching the event could cause Page to go away. Make sure it's still valid before trying to use DragController.
3311         m_didStartDrag = m_frame->page() && dragController.startDrag(m_frame, dragState(), event.event(), m_mouseDownPos);
3312         // FIXME: This seems pretty useless now. The gesture code uses this as a signal for
3313         // whether or not the drag started, but perhaps it can simply use the return value from
3314         // handleDrag(), even though it doesn't mean exactly the same thing.
3315         if (m_didStartDrag)
3316             return true;
3317         // Drag was canned at the last minute - we owe m_dragSrc a DRAGEND event
3318         dispatchDragSrcEvent(EventTypeNames::dragend, event.event());
3319     }
3320
3321     return false;
3322 }
3323
3324 bool EventHandler::handleTextInputEvent(const String& text, Event* underlyingEvent, TextEventInputType inputType)
3325 {
3326     // Platforms should differentiate real commands like selectAll from text input in disguise (like insertNewline),
3327     // and avoid dispatching text input events from keydown default handlers.
3328     ASSERT(!underlyingEvent || !underlyingEvent->isKeyboardEvent() || toKeyboardEvent(underlyingEvent)->type() == EventTypeNames::keypress);
3329
3330     if (!m_frame)
3331         return false;
3332
3333     EventTarget* target;
3334     if (underlyingEvent)
3335         target = underlyingEvent->target();
3336     else
3337         target = eventTargetNodeForDocument(m_frame->document());
3338     if (!target)
3339         return false;
3340
3341     RefPtrWillBeRawPtr<TextEvent> event = TextEvent::create(m_frame->domWindow(), text, inputType);
3342     event->setUnderlyingEvent(underlyingEvent);
3343
3344     target->dispatchEvent(event, IGNORE_EXCEPTION);
3345     return event->defaultHandled();
3346 }
3347
3348 void EventHandler::defaultTextInputEventHandler(TextEvent* event)
3349 {
3350     if (m_frame->editor().handleTextEvent(event))
3351         event->setDefaultHandled();
3352 }
3353
3354 void EventHandler::defaultSpaceEventHandler(KeyboardEvent* event)
3355 {
3356     ASSERT(event->type() == EventTypeNames::keypress);
3357
3358     if (event->ctrlKey() || event->metaKey() || event->altKey())
3359         return;
3360
3361     ScrollDirection direction = event->shiftKey() ? ScrollBlockDirectionBackward : ScrollBlockDirectionForward;
3362     if (scroll(direction, ScrollByPage)) {
3363         event->setDefaultHandled();
3364         return;
3365     }
3366
3367     FrameView* view = m_frame->view();
3368     if (!view)
3369         return;
3370
3371     if (view->scroll(direction, ScrollByPage))
3372         event->setDefaultHandled();
3373 }
3374
3375 void EventHandler::defaultBackspaceEventHandler(KeyboardEvent* event)
3376 {
3377     ASSERT(event->type() == EventTypeNames::keydown);
3378
3379     if (event->ctrlKey() || event->metaKey() || event->altKey())
3380         return;
3381
3382     if (!m_frame->editor().behavior().shouldNavigateBackOnBackspace())
3383         return;
3384
3385     Page* page = m_frame->page();
3386     if (!page || !page->mainFrame()->isLocalFrame())
3387         return;
3388     bool handledEvent = page->deprecatedLocalMainFrame()->loader().client()->navigateBackForward(event->shiftKey() ? 1 : -1);
3389     if (handledEvent)
3390         event->setDefaultHandled();
3391 }
3392
3393 void EventHandler::defaultArrowEventHandler(FocusType focusType, KeyboardEvent* event)
3394 {
3395     ASSERT(event->type() == EventTypeNames::keydown);
3396
3397     if (event->ctrlKey() || event->metaKey() || event->shiftKey())
3398         return;
3399
3400     Page* page = m_frame->page();
3401     if (!page)
3402         return;
3403
3404     if (!isSpatialNavigationEnabled(m_frame))
3405         return;
3406
3407     // Arrows and other possible directional navigation keys can be used in design
3408     // mode editing.
3409     if (m_frame->document()->inDesignMode())
3410         return;
3411
3412     if (page->focusController().advanceFocus(focusType))
3413         event->setDefaultHandled();
3414 }
3415
3416 void EventHandler::defaultTabEventHandler(KeyboardEvent* event)
3417 {
3418     ASSERT(event->type() == EventTypeNames::keydown);
3419
3420     // We should only advance focus on tabs if no special modifier keys are held down.
3421     if (event->ctrlKey() || event->metaKey())
3422         return;
3423
3424     Page* page = m_frame->page();
3425     if (!page)
3426         return;
3427     if (!page->tabKeyCyclesThroughElements())
3428         return;
3429
3430     FocusType focusType = event->shiftKey() ? FocusTypeBackward : FocusTypeForward;
3431
3432     // Tabs can be used in design mode editing.
3433     if (m_frame->document()->inDesignMode())
3434         return;
3435
3436     if (page->focusController().advanceFocus(focusType))
3437         event->setDefaultHandled();
3438 }
3439
3440 void EventHandler::defaultEscapeEventHandler(KeyboardEvent* event)
3441 {
3442     if (HTMLDialogElement* dialog = m_frame->document()->activeModalDialog())
3443         dialog->dispatchEvent(Event::createCancelable(EventTypeNames::cancel));
3444 }
3445
3446 void EventHandler::capsLockStateMayHaveChanged()
3447 {
3448     if (Element* element = m_frame->document()->focusedElement()) {
3449         if (RenderObject* r = element->renderer()) {
3450             if (r->isTextField())
3451                 toRenderTextControlSingleLine(r)->capsLockStateMayHaveChanged();
3452         }
3453     }
3454 }
3455
3456 void EventHandler::setFrameWasScrolledByUser()
3457 {
3458     if (FrameView* view = m_frame->view())
3459         view->setWasScrolledByUser(true);
3460 }
3461
3462 bool EventHandler::passMousePressEventToScrollbar(MouseEventWithHitTestResults& mev)
3463 {
3464     Scrollbar* scrollbar = mev.scrollbar();
3465     updateLastScrollbarUnderMouse(scrollbar, true);
3466
3467     if (!scrollbar || !scrollbar->enabled())
3468         return false;
3469     setFrameWasScrolledByUser();
3470     scrollbar->mouseDown(mev.event());
3471     return true;
3472 }
3473
3474 // If scrollbar (under mouse) is different from last, send a mouse exited. Set
3475 // last to scrollbar if setLast is true; else set last to 0.
3476 void EventHandler::updateLastScrollbarUnderMouse(Scrollbar* scrollbar, bool setLast)
3477 {
3478     if (m_lastScrollbarUnderMouse != scrollbar) {
3479         // Send mouse exited to the old scrollbar.
3480         if (m_lastScrollbarUnderMouse)
3481             m_lastScrollbarUnderMouse->mouseExited();
3482
3483         // Send mouse entered if we're setting a new scrollbar.
3484         if (scrollbar && setLast)
3485             scrollbar->mouseEntered();
3486
3487         m_lastScrollbarUnderMouse = setLast ? scrollbar : 0;
3488     }
3489 }
3490
3491 static const AtomicString& eventNameForTouchPointState(PlatformTouchPoint::State state)
3492 {
3493     switch (state) {
3494     case PlatformTouchPoint::TouchReleased:
3495         return EventTypeNames::touchend;
3496     case PlatformTouchPoint::TouchCancelled:
3497         return EventTypeNames::touchcancel;
3498     case PlatformTouchPoint::TouchPressed:
3499         return EventTypeNames::touchstart;
3500     case PlatformTouchPoint::TouchMoved:
3501         return EventTypeNames::touchmove;
3502     case PlatformTouchPoint::TouchStationary:
3503         // TouchStationary state is not converted to touch events, so fall through to assert.
3504     default:
3505         ASSERT_NOT_REACHED();
3506         return emptyAtom;
3507     }
3508 }
3509
3510 HitTestResult EventHandler::hitTestResultInFrame(LocalFrame* frame, const LayoutPoint& point, HitTestRequest::HitTestRequestType hitType)
3511 {
3512     HitTestResult result(point);
3513
3514     if (!frame || !frame->contentRenderer())
3515         return result;
3516     if (frame->view()) {
3517         IntRect rect = frame->view()->visibleContentRect(IncludeScrollbars);
3518         if (!rect.contains(roundedIntPoint(point)))
3519             return result;
3520     }
3521     frame->contentRenderer()->hitTest(HitTestRequest(hitType), result);
3522     return result;
3523 }
3524
3525 bool EventHandler::handleTouchEvent(const PlatformTouchEvent& event)
3526 {
3527     TRACE_EVENT0("blink", "EventHandler::handleTouchEvent");
3528
3529     const Vector<PlatformTouchPoint>& points = event.touchPoints();
3530
3531     unsigned i;
3532     bool freshTouchEvents = true;
3533     bool allTouchReleased = true;
3534     for (i = 0; i < points.size(); ++i) {
3535         const PlatformTouchPoint& point = points[i];
3536         if (point.state() != PlatformTouchPoint::TouchPressed)
3537             freshTouchEvents = false;
3538         if (point.state() != PlatformTouchPoint::TouchReleased && point.state() != PlatformTouchPoint::TouchCancelled)
3539             allTouchReleased = false;
3540     }
3541     if (freshTouchEvents) {
3542         // Ideally we'd ASSERT !m_touchSequenceDocument here since we should
3543         // have cleared the active document when we saw the last release. But we
3544         // have some tests that violate this, ClusterFuzz could trigger it, and
3545         // there may be cases where the browser doesn't reliably release all
3546         // touches. http://crbug.com/345372 tracks this.
3547         m_touchSequenceDocument.clear();
3548         m_touchSequenceUserGestureToken.clear();
3549     }
3550
3551     OwnPtr<UserGestureIndicator> gestureIndicator;
3552
3553     if (m_touchSequenceUserGestureToken)
3554         gestureIndicator = adoptPtr(new UserGestureIndicator(m_touchSequenceUserGestureToken.release()));
3555     else
3556         gestureIndicator = adoptPtr(new UserGestureIndicator(DefinitelyProcessingUserGesture));
3557
3558     m_touchSequenceUserGestureToken = gestureIndicator->currentToken();
3559
3560     ASSERT(m_frame->view());
3561     if (m_touchSequenceDocument && (!m_touchSequenceDocument->frame() || !m_touchSequenceDocument->frame()->view())) {
3562         // If the active touch document has no frame or view, it's probably being destroyed
3563         // so we can't dispatch events.
3564         return false;
3565     }
3566
3567     // First do hit tests for any new touch points.
3568     for (i = 0; i < points.size(); ++i) {
3569         const PlatformTouchPoint& point = points[i];
3570
3571         // Touch events implicitly capture to the touched node, and don't change
3572         // active/hover states themselves (Gesture events do). So we only need
3573         // to hit-test on touchstart, and it can be read-only.
3574         if (point.state() == PlatformTouchPoint::TouchPressed) {
3575             HitTestRequest::HitTestRequestType hitType = HitTestRequest::TouchEvent | HitTestRequest::ReadOnly | HitTestRequest::Active;
3576             LayoutPoint pagePoint = roundedLayoutPoint(m_frame->view()->windowToContents(point.pos()));
3577             HitTestResult result;
3578             if (!m_touchSequenceDocument) {
3579                 result = hitTestResultAtPoint(pagePoint, hitType);
3580             } else if (m_touchSequenceDocument->frame()) {
3581                 LayoutPoint framePoint = roundedLayoutPoint(m_touchSequenceDocument->frame()->view()->windowToContents(point.pos()));
3582                 result = hitTestResultInFrame(m_touchSequenceDocument->frame(), framePoint, hitType);
3583             } else
3584                 continue;
3585
3586             Node* node = result.innerNode();
3587             if (!node)
3588                 continue;
3589
3590             // Touch events should not go to text nodes
3591             if (node->isTextNode())
3592                 node = NodeRenderingTraversal::parent(node);
3593
3594             if (!m_touchSequenceDocument) {
3595                 // Keep track of which document should receive all touch events
3596                 // in the active sequence. This must be a single document to
3597                 // ensure we don't leak Nodes between documents.
3598                 m_touchSequenceDocument = &(result.innerNode()->document());
3599                 ASSERT(m_touchSequenceDocument->frame()->view());
3600             }
3601
3602             // Ideally we'd ASSERT(!m_targetForTouchID.contains(point.id())
3603             // since we shouldn't get a touchstart for a touch that's already
3604             // down. However EventSender allows this to be violated and there's
3605             // some tests that take advantage of it. There may also be edge
3606             // cases in the browser where this happens.
3607             // See http://crbug.com/345372.
3608             m_targetForTouchID.set(point.id(), node);
3609
3610             TouchAction effectiveTouchAction = computeEffectiveTouchAction(*node);
3611             if (effectiveTouchAction != TouchActionAuto)
3612                 m_frame->page()->chrome().client().setTouchAction(effectiveTouchAction);
3613         }
3614     }
3615
3616     m_touchPressed = !allTouchReleased;
3617
3618     // If there's no document receiving touch events, or no handlers on the
3619     // document set to receive the events, then we can skip all the rest of
3620     // this work.
3621     if (!m_touchSequenceDocument || !m_touchSequenceDocument->frameHost() || !m_touchSequenceDocument->frameHost()->eventHandlerRegistry().hasEventHandlers(EventHandlerRegistry::TouchEvent) || !m_touchSequenceDocument->frame()) {
3622         if (allTouchReleased) {
3623             m_touchSequenceDocument.clear();
3624             m_touchSequenceUserGestureToken.clear();
3625         }
3626         return false;
3627     }
3628
3629     // Build up the lists to use for the 'touches', 'targetTouches' and
3630     // 'changedTouches' attributes in the JS event. See
3631     // http://www.w3.org/TR/touch-events/#touchevent-interface for how these
3632     // lists fit together.
3633
3634     // Holds the complete set of touches on the screen.
3635     RefPtrWillBeRawPtr<TouchList> touches = TouchList::create();
3636
3637     // A different view on the 'touches' list above, filtered and grouped by
3638     // event target. Used for the 'targetTouches' list in the JS event.
3639     typedef WillBeHeapHashMap<EventTarget*, RefPtrWillBeMember<TouchList> > TargetTouchesHeapMap;
3640     TargetTouchesHeapMap touchesByTarget;
3641
3642     // Array of touches per state, used to assemble the 'changedTouches' list.
3643     typedef WillBeHeapHashSet<RefPtrWillBeMember<EventTarget> > EventTargetSet;
3644     struct {
3645         // The touches corresponding to the particular change state this struct
3646         // instance represents.
3647         RefPtrWillBeMember<TouchList> m_touches;
3648         // Set of targets involved in m_touches.
3649         EventTargetSet m_targets;
3650     } changedTouches[PlatformTouchPoint::TouchStateEnd];
3651
3652     for (i = 0; i < points.size(); ++i) {
3653         const PlatformTouchPoint& point = points[i];
3654         PlatformTouchPoint::State pointState = point.state();
3655         RefPtrWillBeRawPtr<EventTarget> touchTarget = nullptr;
3656
3657         if (pointState == PlatformTouchPoint::TouchReleased || pointState == PlatformTouchPoint::TouchCancelled) {
3658             // The target should be the original target for this touch, so get
3659             // it from the hashmap. As it's a release or cancel we also remove
3660             // it from the map.
3661             touchTarget = m_targetForTouchID.take(point.id());
3662         } else {
3663             // No hittest is performed on move or stationary, since the target
3664             // is not allowed to change anyway.
3665             touchTarget = m_targetForTouchID.get(point.id());
3666         }
3667
3668         LocalFrame* targetFrame = 0;
3669         bool knownTarget = false;
3670         if (touchTarget) {
3671             Document& doc = touchTarget->toNode()->document();
3672             // If the target node has moved to a new document while it was being touched,
3673             // we can't send events to the new document because that could leak nodes
3674             // from one document to another. See http://crbug.com/394339.
3675             if (&doc == m_touchSequenceDocument.get()) {
3676                 targetFrame = doc.frame();
3677                 knownTarget = true;
3678             }
3679         }
3680         if (!knownTarget) {
3681             // If we don't have a target registered for the point it means we've
3682             // missed our opportunity to do a hit test for it (due to some
3683             // optimization that prevented blink from ever seeing the
3684             // touchstart), or that the touch started outside the active touch
3685             // sequence document. We should still include the touch in the
3686             // Touches list reported to the application (eg. so it can
3687             // differentiate between a one and two finger gesture), but we won't
3688             // actually dispatch any events for it. Set the target to the
3689             // Document so that there's some valid node here. Perhaps this
3690             // should really be LocalDOMWindow, but in all other cases the target of
3691             // a Touch is a Node so using the window could be a breaking change.
3692             // Since we know there was no handler invoked, the specific target
3693             // should be completely irrelevant to the application.
3694             touchTarget = m_touchSequenceDocument;
3695             targetFrame = m_touchSequenceDocument->frame();
3696         }
3697         ASSERT(targetFrame);
3698
3699         // pagePoint should always be relative to the target elements
3700         // containing frame.
3701         FloatPoint pagePoint = targetFrame->view()->windowToContents(point.pos());
3702
3703         float scaleFactor = 1.0f / targetFrame->pageZoomFactor();
3704
3705         FloatPoint adjustedPagePoint = pagePoint.scaledBy(scaleFactor);
3706         FloatSize adjustedRadius = point.radius().scaledBy(scaleFactor);
3707
3708         RefPtrWillBeRawPtr<Touch> touch = Touch::create(
3709             targetFrame, touchTarget.get(), point.id(), point.screenPos(), adjustedPagePoint, adjustedRadius, point.rotationAngle(), point.force());
3710
3711         // Ensure this target's touch list exists, even if it ends up empty, so
3712         // it can always be passed to TouchEvent::Create below.
3713         TargetTouchesHeapMap::iterator targetTouchesIterator = touchesByTarget.find(touchTarget.get());
3714         if (targetTouchesIterator == touchesByTarget.end()) {
3715             touchesByTarget.set(touchTarget.get(), TouchList::create());
3716             targetTouchesIterator = touchesByTarget.find(touchTarget.get());
3717         }
3718
3719         // touches and targetTouches should only contain information about
3720         // touches still on the screen, so if this point is released or
3721         // cancelled it will only appear in the changedTouches list.
3722         if (pointState != PlatformTouchPoint::TouchReleased && pointState != PlatformTouchPoint::TouchCancelled) {
3723             touches->append(touch);
3724             targetTouchesIterator->value->append(touch);
3725         }
3726
3727         // Now build up the correct list for changedTouches.
3728         // Note that  any touches that are in the TouchStationary state (e.g. if
3729         // the user had several points touched but did not move them all) should
3730         // never be in the changedTouches list so we do not handle them
3731         // explicitly here. See https://bugs.webkit.org/show_bug.cgi?id=37609
3732         // for further discussion about the TouchStationary state.
3733         if (pointState != PlatformTouchPoint::TouchStationary && knownTarget) {
3734             ASSERT(pointState < PlatformTouchPoint::TouchStateEnd);
3735             if (!changedTouches[pointState].m_touches)
3736                 changedTouches[pointState].m_touches = TouchList::create();
3737             changedTouches[pointState].m_touches->append(touch);
3738             changedTouches[pointState].m_targets.add(touchTarget);
3739         }
3740     }
3741     if (allTouchReleased) {
3742         m_touchSequenceDocument.clear();
3743         m_touchSequenceUserGestureToken.clear();
3744     }
3745
3746     // Now iterate the changedTouches list and m_targets within it, sending
3747     // events to the targets as required.
3748     bool swallowedEvent = false;
3749     for (unsigned state = 0; state != PlatformTouchPoint::TouchStateEnd; ++state) {
3750         if (!changedTouches[state].m_touches)
3751             continue;
3752
3753         const AtomicString& stateName(eventNameForTouchPointState(static_cast<PlatformTouchPoint::State>(state)));
3754         const EventTargetSet& targetsForState = changedTouches[state].m_targets;
3755         for (EventTargetSet::const_iterator it = targetsForState.begin(); it != targetsForState.end(); ++it) {
3756             EventTarget* touchEventTarget = it->get();
3757             RefPtrWillBeRawPtr<TouchEvent> touchEvent = TouchEvent::create(
3758                 touches.get(), touchesByTarget.get(touchEventTarget), changedTouches[state].m_touches.get(),
3759                 stateName, touchEventTarget->toNode()->document().domWindow(),
3760                 event.ctrlKey(), event.altKey(), event.shiftKey(), event.metaKey(), event.cancelable());
3761             touchEventTarget->toNode()->dispatchTouchEvent(touchEvent.get());
3762             swallowedEvent = swallowedEvent || touchEvent->defaultPrevented() || touchEvent->defaultHandled();
3763         }
3764     }
3765
3766     return swallowedEvent;
3767 }
3768
3769 TouchAction EventHandler::intersectTouchAction(TouchAction action1, TouchAction action2)
3770 {
3771     if (action1 == TouchActionNone || action2 == TouchActionNone)
3772         return TouchActionNone;
3773     if (action1 == TouchActionAuto)
3774         return action2;
3775     if (action2 == TouchActionAuto)
3776         return action1;
3777     if (!(action1 & action2))
3778         return TouchActionNone;
3779     return action1 & action2;
3780 }
3781
3782 TouchAction EventHandler::computeEffectiveTouchAction(const Node& node)
3783 {
3784     // Start by permitting all actions, then walk the elements supporting
3785     // touch-action from the target node up to the nearest scrollable ancestor
3786     // and exclude any prohibited actions.
3787     TouchAction effectiveTouchAction = TouchActionAuto;
3788     for (const Node* curNode = &node; curNode; curNode = NodeRenderingTraversal::parent(curNode)) {
3789         if (RenderObject* renderer = curNode->renderer()) {
3790             if (renderer->supportsTouchAction()) {
3791                 TouchAction action = renderer->style()->touchAction();
3792                 effectiveTouchAction = intersectTouchAction(action, effectiveTouchAction);
3793                 if (effectiveTouchAction == TouchActionNone)
3794                     break;
3795             }
3796
3797             // If we've reached an ancestor that supports a touch action, search no further.
3798             if (renderer->isBox() && toRenderBox(renderer)->scrollsOverflow())
3799                 break;
3800         }
3801     }
3802     return effectiveTouchAction;
3803 }
3804
3805 void EventHandler::setLastKnownMousePosition(const PlatformMouseEvent& event)
3806 {
3807     m_mousePositionIsUnknown = false;
3808     m_lastKnownMousePosition = event.position();
3809     m_lastKnownMouseGlobalPosition = event.globalPosition();
3810 }
3811
3812 bool EventHandler::passMousePressEventToSubframe(MouseEventWithHitTestResults& mev, LocalFrame* subframe)
3813 {
3814     // If we're clicking into a frame that is selected, the frame will appear
3815     // greyed out even though we're clicking on the selection.  This looks
3816     // really strange (having the whole frame be greyed out), so we deselect the
3817     // selection.
3818     IntPoint p = m_frame->view()->windowToContents(mev.event().position());
3819     if (m_frame->selection().contains(p)) {
3820         VisiblePosition visiblePos(
3821             mev.innerNode()->renderer()->positionForPoint(mev.localPoint()));
3822         VisibleSelection newSelection(visiblePos);
3823         m_frame->selection().setSelection(newSelection);
3824     }
3825
3826     subframe->eventHandler().handleMousePressEvent(mev.event());
3827     return true;
3828 }
3829
3830 bool EventHandler::passMouseMoveEventToSubframe(MouseEventWithHitTestResults& mev, LocalFrame* subframe, HitTestResult* hoveredNode)
3831 {
3832     if (m_mouseDownMayStartDrag && !m_mouseDownWasInSubframe)
3833         return false;
3834     subframe->eventHandler().handleMouseMoveOrLeaveEvent(mev.event(), hoveredNode);
3835     return true;
3836 }
3837
3838 bool EventHandler::passMouseReleaseEventToSubframe(MouseEventWithHitTestResults& mev, LocalFrame* subframe)
3839 {
3840     subframe->eventHandler().handleMouseReleaseEvent(mev.event());
3841     return true;
3842 }
3843
3844 bool EventHandler::passWheelEventToWidget(const PlatformWheelEvent& wheelEvent, Widget* widget)
3845 {
3846     // We can sometimes get a null widget!  EventHandlerMac handles a null
3847     // widget by returning false, so we do the same.
3848     if (!widget)
3849         return false;
3850
3851     // If not a FrameView, then probably a plugin widget.  Those will receive
3852     // the event via an EventTargetNode dispatch when this returns false.
3853     if (!widget->isFrameView())
3854         return false;
3855
3856     return toFrameView(widget)->frame().eventHandler().handleWheelEvent(wheelEvent);
3857 }
3858
3859 bool EventHandler::passWidgetMouseDownEventToWidget(const MouseEventWithHitTestResults& event)
3860 {
3861     // Figure out which view to send the event to.
3862     if (!event.innerNode() || !event.innerNode()->renderer() || !event.innerNode()->renderer()->isWidget())
3863         return false;
3864     return false;
3865 }
3866
3867 PassRefPtrWillBeRawPtr<DataTransfer> EventHandler::createDraggingDataTransfer() const
3868 {
3869     return DataTransfer::create(DataTransfer::DragAndDrop, DataTransferWritable, DataObject::create());
3870 }
3871
3872 void EventHandler::focusDocumentView()
3873 {
3874     Page* page = m_frame->page();
3875     if (!page)
3876         return;
3877     page->focusController().focusDocumentView(m_frame);
3878 }
3879
3880 unsigned EventHandler::accessKeyModifiers()
3881 {
3882 #if OS(MACOSX)
3883     return PlatformEvent::CtrlKey | PlatformEvent::AltKey;
3884 #else
3885     return PlatformEvent::AltKey;
3886 #endif
3887 }
3888
3889 } // namespace blink