Support gesture events in WebFrameWidgetImpl.

Source/web/WebFrameWidgetImpl.cpp

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 704 matching lines @@
     // FIXME: Add context menu support (Windows).
 }
 
 bool WebFrameWidgetImpl::handleMouseWheel(LocalFrame& mainFrame, const WebMouseWheelEvent& event)
 {
     return PageWidgetEventHandler::handleMouseWheel(mainFrame, event);
 }
 
 bool WebFrameWidgetImpl::handleGestureEvent(const WebGestureEvent& event)
 {
-    // FIXME: Add gesture support.
-    return false;
+    bool eventSwallowed = false;
+    bool eventCancelled = false;
+    switch (event.type) {
+    case WebInputEvent::GestureScrollBegin:
+    case WebInputEvent::GestureScrollEnd:
+    case WebInputEvent::GestureScrollUpdate:
+    case WebInputEvent::GestureTap:
+    case WebInputEvent::GestureTapUnconfirmed:
+    case WebInputEvent::GestureTapDown:
+    case WebInputEvent::GestureShowPress:
+    case WebInputEvent::GestureTapCancel:
+    case WebInputEvent::GestureDoubleTap:
+    case WebInputEvent::GestureTwoFingerTap:
+    case WebInputEvent::GestureLongPress:
+    case WebInputEvent::GestureLongTap:
+        break;
+    case WebInputEvent::GestureFlingStart:
+    case WebInputEvent::GestureFlingCancel:
+        m_client->didHandleGestureEvent(event, eventCancelled);
+        return false;
+    default:
+        ASSERT_NOT_REACHED();
+    }
+    const LocalFrame* frame = m_localRoot->frame();

[dcheng, 2015/08/31 16:51:20]

Nit: const here looks weird: handling a gesture event doesn't really seem like
an action that wouldn't change any state on the frame.

[Peng, 2015/08/31 17:34:57]

Done.

+    eventSwallowed = frame->eventHandler().handleGestureEvent(PlatformGestureEventBuilder(frame->view(), event));
+    m_client->didHandleGestureEvent(event, eventCancelled);
+    return eventSwallowed;
 }
 
 bool WebFrameWidgetImpl::handleKeyEvent(const WebKeyboardEvent& event)
 {
     ASSERT((event.type == WebInputEvent::RawKeyDown)
         || (event.type == WebInputEvent::KeyDown)
         || (event.type == WebInputEvent::KeyUp));
 
     // Please refer to the comments explaining the m_suppressNextKeypressEvent
     // member.
@@ skipping 313 matching lines @@
     // correspond to Page visibility, but is necessary until we properly sort out OOPIF visibility.
     page()->setVisibilityState(static_cast<PageVisibilityState>(visibilityState), isInitialState);
 
     if (m_layerTreeView) {
         bool visible = visibilityState == WebPageVisibilityStateVisible;
         m_layerTreeView->setVisible(visible);
     }
 }
 
 } // namespace blink