Source/WebKit2/WebProcess/WebPage/EventDispatcher.cpp

   1 /*
   2  * Copyright (C) 2011 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
  14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  23  * THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "EventDispatcher.h"
  28
  29 #include "WebEvent.h"
  30 #include "WebEventConversion.h"
  31 #include "WebPage.h"
  32 #include "WebPageProxyMessages.h"
  33 #include "WebProcess.h"
  34 #include <WebCore/Page.h>
  35 #include <WebCore/RunLoop.h>
  36 #include <wtf/MainThread.h>
  37
  38 #if ENABLE(THREADED_SCROLLING)
  39 #include <WebCore/ScrollingCoordinator.h>
  40 #include <WebCore/ScrollingThread.h>
  41 #include <WebCore/ScrollingTree.h>
  42 #endif
  43
  44 using namespace WebCore;
  45
  46 namespace WebKit {
  47
  48 EventDispatcher::EventDispatcher()
  49 {
  50 }
  51
  52 EventDispatcher::~EventDispatcher()
  53 {
  54 }
  55
  56 #if ENABLE(THREADED_SCROLLING)
  57 void EventDispatcher::addScrollingTreeForPage(WebPage* webPage)
  58 {
  59     MutexLocker locker(m_scrollingTreesMutex);
  60
  61     ASSERT(webPage->corePage()->scrollingCoordinator());
  62     ASSERT(!m_scrollingTrees.contains(webPage->pageID()));
  63     m_scrollingTrees.set(webPage->pageID(), webPage->corePage()->scrollingCoordinator()->scrollingTree());
  64 }
  65
  66 void EventDispatcher::removeScrollingTreeForPage(WebPage* webPage)
  67 {
  68     MutexLocker locker(m_scrollingTreesMutex);
  69     ASSERT(m_scrollingTrees.contains(webPage->pageID()));
  70
  71     m_scrollingTrees.remove(webPage->pageID());
  72 }
  73 #endif
  74
  75 void EventDispatcher::didReceiveMessageOnConnectionWorkQueue(CoreIPC::Connection* connection, CoreIPC::MessageID messageID, CoreIPC::ArgumentDecoder* arguments, bool& didHandleMessage)
  76 {
  77     if (messageID.is<CoreIPC::MessageClassEventDispatcher>()) {
  78         didReceiveEventDispatcherMessageOnConnectionWorkQueue(connection, messageID, arguments, didHandleMessage);
  79         return;
  80     }
  81 }
  82
  83 void EventDispatcher::wheelEvent(CoreIPC::Connection*, uint64_t pageID, const WebWheelEvent& wheelEvent, bool canGoBack, bool canGoForward)
  84 {
  85 #if ENABLE(THREADED_SCROLLING)
  86     MutexLocker locker(m_scrollingTreesMutex);
  87     if (ScrollingTree* scrollingTree = m_scrollingTrees.get(pageID).get()) {
  88         PlatformWheelEvent platformWheelEvent = platform(wheelEvent);
  89
  90         // FIXME: It's pretty horrible that we're updating the back/forward state here.
  91         // WebCore should always know the current state and know when it changes so the
  92         // scrolling tree can be notified.
  93         // We only need to do this at the beginning of the gesture.
  94         if (platformWheelEvent.phase() == PlatformWheelEventPhaseBegan)
  95             ScrollingThread::dispatch(bind(&ScrollingTree::updateBackForwardState, scrollingTree, canGoBack, canGoForward));
  96
  97         ScrollingTree::EventResult result = scrollingTree->tryToHandleWheelEvent(platformWheelEvent);
  98         if (result == ScrollingTree::DidHandleEvent || result == ScrollingTree::DidNotHandleEvent) {
  99             sendDidReceiveEvent(pageID, wheelEvent, result == ScrollingTree::DidHandleEvent);
 100             return;
 101         }
 102     }
 103 #else
 104     UNUSED_PARAM(canGoBack);
 105     UNUSED_PARAM(canGoForward);
 106 #endif
 107
 108     RunLoop::main()->dispatch(bind(&EventDispatcher::dispatchWheelEvent, this, pageID, wheelEvent));
 109 }
 110
 111 #if ENABLE(GESTURE_EVENTS)
 112 void EventDispatcher::gestureEvent(CoreIPC::Connection*, uint64_t pageID, const WebGestureEvent& gestureEvent)
 113 {
 114     RunLoop::main()->dispatch(bind(&EventDispatcher::dispatchGestureEvent, this, pageID, gestureEvent));
 115 }
 116 #endif
 117
 118 void EventDispatcher::dispatchWheelEvent(uint64_t pageID, const WebWheelEvent& wheelEvent)
 119 {
 120     ASSERT(isMainThread());
 121
 122     WebPage* webPage = WebProcess::shared().webPage(pageID);
 123     if (!webPage)
 124         return;
 125
 126     webPage->wheelEvent(wheelEvent);
 127 }
 128
 129 #if ENABLE(GESTURE_EVENTS)
 130 void EventDispatcher::dispatchGestureEvent(uint64_t pageID, const WebGestureEvent& gestureEvent)
 131 {
 132     ASSERT(isMainThread());
 133
 134     WebPage* webPage = WebProcess::shared().webPage(pageID);
 135     if (!webPage)
 136         return;
 137
 138     webPage->gestureEvent(gestureEvent);
 139 }
 140 #endif
 141
 142 #if ENABLE(THREADED_SCROLLING)
 143 void EventDispatcher::sendDidReceiveEvent(uint64_t pageID, const WebEvent& event, bool didHandleEvent)
 144 {
 145     WebProcess::shared().connection()->send(Messages::WebPageProxy::DidReceiveEvent(static_cast<uint32_t>(event.type()), didHandleEvent), pageID);
 146 }
 147 #endif
 148
 149 } // namespace WebKit