src/third_party/WebKit/Source/core/html/shadow/SpinButtonElement.cpp

   1 /*
   2  * Copyright (C) 2006, 2008, 2010 Apple Inc. All rights reserved.
   3  * Copyright (C) 2010 Google Inc. All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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  21  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  22  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include "config.h"
  28 #include "core/html/shadow/SpinButtonElement.h"
  29
  30 #include "HTMLNames.h"
  31 #include "core/events/MouseEvent.h"
  32 #include "core/events/ThreadLocalEventNames.h"
  33 #include "core/events/WheelEvent.h"
  34 #include "core/html/shadow/ShadowElementNames.h"
  35 #include "core/page/Chrome.h"
  36 #include "core/page/EventHandler.h"
  37 #include "core/frame/Frame.h"
  38 #include "core/page/Page.h"
  39 #include "core/rendering/RenderBox.h"
  40 #include "platform/scroll/ScrollbarTheme.h"
  41
  42 namespace WebCore {
  43
  44 using namespace HTMLNames;
  45
  46 inline SpinButtonElement::SpinButtonElement(Document& document, SpinButtonOwner& spinButtonOwner)
  47     : HTMLDivElement(document)
  48     , m_spinButtonOwner(&spinButtonOwner)
  49     , m_capturing(false)
  50     , m_upDownState(Indeterminate)
  51     , m_pressStartingState(Indeterminate)
  52     , m_repeatingTimer(this, &SpinButtonElement::repeatingTimerFired)
  53 {
  54 }
  55
  56 PassRefPtr<SpinButtonElement> SpinButtonElement::create(Document& document, SpinButtonOwner& spinButtonOwner)
  57 {
  58     RefPtr<SpinButtonElement> element = adoptRef(new SpinButtonElement(document, spinButtonOwner));
  59     element->setShadowPseudoId(AtomicString("-webkit-inner-spin-button", AtomicString::ConstructFromLiteral));
  60     element->setAttribute(idAttr, ShadowElementNames::spinButton());
  61     return element.release();
  62 }
  63
  64 void SpinButtonElement::detach(const AttachContext& context)
  65 {
  66     releaseCapture();
  67     HTMLDivElement::detach(context);
  68 }
  69
  70 void SpinButtonElement::defaultEventHandler(Event* event)
  71 {
  72     if (!event->isMouseEvent()) {
  73         if (!event->defaultHandled())
  74             HTMLDivElement::defaultEventHandler(event);
  75         return;
  76     }
  77
  78     RenderBox* box = renderBox();
  79     if (!box) {
  80         if (!event->defaultHandled())
  81             HTMLDivElement::defaultEventHandler(event);
  82         return;
  83     }
  84
  85     if (!shouldRespondToMouseEvents()) {
  86         if (!event->defaultHandled())
  87             HTMLDivElement::defaultEventHandler(event);
  88         return;
  89     }
  90
  91     MouseEvent* mouseEvent = toMouseEvent(event);
  92     IntPoint local = roundedIntPoint(box->absoluteToLocal(mouseEvent->absoluteLocation(), UseTransforms));
  93     if (mouseEvent->type() == EventTypeNames::mousedown && mouseEvent->button() == LeftButton) {
  94         if (box->pixelSnappedBorderBoxRect().contains(local)) {
  95             // The following functions of HTMLInputElement may run JavaScript
  96             // code which detaches this shadow node. We need to take a reference
  97             // and check renderer() after such function calls.
  98             RefPtr<Node> protector(this);
  99             if (m_spinButtonOwner)
 100                 m_spinButtonOwner->focusAndSelectSpinButtonOwner();
 101             if (renderer()) {
 102                 if (m_upDownState != Indeterminate) {
 103                     // A JavaScript event handler called in doStepAction() below
 104                     // might change the element state and we might need to
 105                     // cancel the repeating timer by the state change. If we
 106                     // started the timer after doStepAction(), we would have no
 107                     // chance to cancel the timer.
 108                     startRepeatingTimer();
 109                     doStepAction(m_upDownState == Up ? 1 : -1);
 110                 }
 111             }
 112             event->setDefaultHandled();
 113         }
 114     } else if (mouseEvent->type() == EventTypeNames::mouseup && mouseEvent->button() == LeftButton) {
 115         stopRepeatingTimer();
 116     } else if (event->type() == EventTypeNames::mousemove) {
 117         if (box->pixelSnappedBorderBoxRect().contains(local)) {
 118             if (!m_capturing) {
 119                 if (Frame* frame = document().frame()) {
 120                     frame->eventHandler().setCapturingMouseEventsNode(this);
 121                     m_capturing = true;
 122                     if (Page* page = document().page())
 123                         page->chrome().registerPopupOpeningObserver(this);
 124                 }
 125             }
 126             UpDownState oldUpDownState = m_upDownState;
 127             m_upDownState = (local.y() < box->height() / 2) ? Up : Down;
 128             if (m_upDownState != oldUpDownState)
 129                 renderer()->repaint();
 130         } else {
 131             releaseCapture();
 132             m_upDownState = Indeterminate;
 133         }
 134     }
 135
 136     if (!event->defaultHandled())
 137         HTMLDivElement::defaultEventHandler(event);
 138 }
 139
 140 void SpinButtonElement::willOpenPopup()
 141 {
 142     releaseCapture();
 143     m_upDownState = Indeterminate;
 144 }
 145
 146 void SpinButtonElement::forwardEvent(Event* event)
 147 {
 148     if (!renderBox())
 149         return;
 150
 151     if (!event->hasInterface(EventNames::WheelEvent))
 152         return;
 153
 154     if (!m_spinButtonOwner)
 155         return;
 156
 157     if (!m_spinButtonOwner->shouldSpinButtonRespondToWheelEvents())
 158         return;
 159
 160     doStepAction(toWheelEvent(event)->wheelDeltaY());
 161     event->setDefaultHandled();
 162 }
 163
 164 bool SpinButtonElement::willRespondToMouseMoveEvents()
 165 {
 166     if (renderBox() && shouldRespondToMouseEvents())
 167         return true;
 168
 169     return HTMLDivElement::willRespondToMouseMoveEvents();
 170 }
 171
 172 bool SpinButtonElement::willRespondToMouseClickEvents()
 173 {
 174     if (renderBox() && shouldRespondToMouseEvents())
 175         return true;
 176
 177     return HTMLDivElement::willRespondToMouseClickEvents();
 178 }
 179
 180 void SpinButtonElement::doStepAction(int amount)
 181 {
 182     if (!m_spinButtonOwner)
 183         return;
 184
 185     if (amount > 0)
 186         m_spinButtonOwner->spinButtonStepUp();
 187     else if (amount < 0)
 188         m_spinButtonOwner->spinButtonStepDown();
 189 }
 190
 191 void SpinButtonElement::releaseCapture()
 192 {
 193     stopRepeatingTimer();
 194     if (m_capturing) {
 195         if (Frame* frame = document().frame()) {
 196             frame->eventHandler().setCapturingMouseEventsNode(0);
 197             m_capturing = false;
 198             if (Page* page = document().page())
 199                 page->chrome().unregisterPopupOpeningObserver(this);
 200         }
 201     }
 202 }
 203
 204 bool SpinButtonElement::matchesReadOnlyPseudoClass() const
 205 {
 206     return shadowHost()->matchesReadOnlyPseudoClass();
 207 }
 208
 209 bool SpinButtonElement::matchesReadWritePseudoClass() const
 210 {
 211     return shadowHost()->matchesReadWritePseudoClass();
 212 }
 213
 214 void SpinButtonElement::startRepeatingTimer()
 215 {
 216     m_pressStartingState = m_upDownState;
 217     ScrollbarTheme* theme = ScrollbarTheme::theme();
 218     m_repeatingTimer.start(theme->initialAutoscrollTimerDelay(), theme->autoscrollTimerDelay());
 219 }
 220
 221 void SpinButtonElement::stopRepeatingTimer()
 222 {
 223     m_repeatingTimer.stop();
 224 }
 225
 226 void SpinButtonElement::step(int amount)
 227 {
 228     if (!shouldRespondToMouseEvents())
 229         return;
 230     // On Mac OS, NSStepper updates the value for the button under the mouse
 231     // cursor regardless of the button pressed at the beginning. So the
 232     // following check is not needed for Mac OS.
 233 #if !OS(MACOSX)
 234     if (m_upDownState != m_pressStartingState)
 235         return;
 236 #endif
 237     doStepAction(amount);
 238 }
 239
 240 void SpinButtonElement::repeatingTimerFired(Timer<SpinButtonElement>*)
 241 {
 242     if (m_upDownState != Indeterminate)
 243         step(m_upDownState == Up ? 1 : -1);
 244 }
 245
 246 void SpinButtonElement::setHovered(bool flag)
 247 {
 248     if (!flag)
 249         m_upDownState = Indeterminate;
 250     HTMLDivElement::setHovered(flag);
 251 }
 252
 253 bool SpinButtonElement::shouldRespondToMouseEvents()
 254 {
 255     return !m_spinButtonOwner || m_spinButtonOwner->shouldSpinButtonRespondToMouseEvents();
 256 }
 257
 258 }