Implement MouseEvent buttons attribute.

Source/core/page/EventHandler.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 1616 matching lines @@
 
 
 bool EventHandler::dispatchDragEvent(const AtomicString& eventType, Node* dragTarget, const PlatformMouseEvent& event, DataTransfer* dataTransfer)
 {
     FrameView* view = m_frame->view();
 
     // FIXME: We might want to dispatch a dragleave even if the view is gone.
     if (!view)
         return false;
 
+    // FIXME: The drag event have to support for |buttons| attribute because
+    // the event is derived from mouse event. Please see crbug.com/276941.
     RefPtrWillBeRawPtr<MouseEvent> me = MouseEvent::create(eventType,
         true, true, m_frame->document()->domWindow(),
         0, event.globalPosition().x(), event.globalPosition().y(), event.position().x(), event.position().y(),
         event.movementDelta().x(), event.movementDelta().y(),
         event.ctrlKey(), event.altKey(), event.shiftKey(), event.metaKey(),
-        0, nullptr, dataTransfer);
+        0, 0, nullptr, dataTransfer);
 
     dragTarget->dispatchEvent(me.get(), IGNORE_EXCEPTION);
     return me->defaultPrevented();
 }
 
 static bool targetIsFrame(Node* target, LocalFrame*& frame)
 {
     if (!isHTMLFrameElementBase(target))
         return false;
 
@@ skipping 571 matching lines @@
 }
 
 bool EventHandler::handleGestureTap(const GestureEventWithHitTestResults& targetedEvent)
 {
     RefPtrWillBeRawPtr<FrameView> protector(m_frame->view());
     const PlatformGestureEvent& gestureEvent = targetedEvent.event();
     HitTestRequest::HitTestRequestType hitType = getHitTypeForGestureType(gestureEvent.type());
 
     UserGestureIndicator gestureIndicator(DefinitelyProcessingUserGesture);
 
-    unsigned modifierFlags = 0;
-    if (gestureEvent.altKey())
-        modifierFlags |= PlatformEvent::AltKey;
-    if (gestureEvent.ctrlKey())
-        modifierFlags |= PlatformEvent::CtrlKey;
-    if (gestureEvent.metaKey())
-        modifierFlags |= PlatformEvent::MetaKey;
-    if (gestureEvent.shiftKey())
-        modifierFlags |= PlatformEvent::ShiftKey;
-    PlatformEvent::Modifiers modifiers = static_cast<PlatformEvent::Modifiers>(modifierFlags);
-
     HitTestResult currentHitTest = targetedEvent.hitTestResult();
 
     // We use the adjusted position so the application isn't surprised to see a event with
     // co-ordinates outside the target's bounds.
     IntPoint adjustedPoint = m_frame->view()->windowToContents(gestureEvent.position());
 
+    unsigned modifiers = gestureEvent.modifiers();
     PlatformMouseEvent fakeMouseMove(gestureEvent.position(), gestureEvent.globalPosition(),
         NoButton, PlatformEvent::MouseMoved, /* clickCount */ 0,
-        modifiers, PlatformMouseEvent::FromTouch, gestureEvent.timestamp());
+        static_cast<PlatformEvent::Modifiers>(modifiers),
+        PlatformMouseEvent::FromTouch, gestureEvent.timestamp());
     dispatchMouseEvent(EventTypeNames::mousemove, currentHitTest.innerNode(), 0, fakeMouseMove, true);
 
     // Do a new hit-test in case the mousemove event changed the DOM.
     // Note that if the original hit test wasn't over an element (eg. was over a scrollbar) we
     // don't want to re-hit-test because it may be in the wrong frame (and there's no way the page
     // could have seen the event anyway).
     // FIXME: Use a hit-test cache to avoid unnecessary hit tests. http://crbug.com/398920
     if (currentHitTest.innerNode())
         currentHitTest = hitTestResultInFrame(m_frame, adjustedPoint, hitType);
     m_clickNode = currentHitTest.innerNode();
     if (m_clickNode && m_clickNode->isTextNode())
         m_clickNode = NodeRenderingTraversal::parent(*m_clickNode);
 
     PlatformMouseEvent fakeMouseDown(gestureEvent.position(), gestureEvent.globalPosition(),
         LeftButton, PlatformEvent::MousePressed, gestureEvent.tapCount(),
-        modifiers, PlatformMouseEvent::FromTouch,  gestureEvent.timestamp());
+        static_cast<PlatformEvent::Modifiers>(modifiers | PlatformEvent::LeftButtonDown),
+        PlatformMouseEvent::FromTouch,  gestureEvent.timestamp());
     bool swallowMouseDownEvent = !dispatchMouseEvent(EventTypeNames::mousedown, currentHitTest.innerNode(), gestureEvent.tapCount(), fakeMouseDown, true);
     if (!swallowMouseDownEvent)
         swallowMouseDownEvent = handleMouseFocus(MouseEventWithHitTestResults(fakeMouseDown, currentHitTest));
     if (!swallowMouseDownEvent) {
         swallowMouseDownEvent = handleMousePressEvent(MouseEventWithHitTestResults(fakeMouseDown, currentHitTest));
         // m_selectionInitiationState is initialized after dispatching mousedown event.
         m_selectionInitiationState = HaveNotStartedSelection;
     }
 
     // FIXME: Use a hit-test cache to avoid unnecessary hit tests. http://crbug.com/398920
     if (currentHitTest.innerNode())
         currentHitTest = hitTestResultInFrame(m_frame, adjustedPoint, hitType);
     PlatformMouseEvent fakeMouseUp(gestureEvent.position(), gestureEvent.globalPosition(),
         LeftButton, PlatformEvent::MouseReleased, gestureEvent.tapCount(),
-        modifiers, PlatformMouseEvent::FromTouch,  gestureEvent.timestamp());
+        static_cast<PlatformEvent::Modifiers>(modifiers),
+        PlatformMouseEvent::FromTouch,  gestureEvent.timestamp());
     bool swallowMouseUpEvent = !dispatchMouseEvent(EventTypeNames::mouseup, currentHitTest.innerNode(), gestureEvent.tapCount(), fakeMouseUp, false);
 
     bool swallowClickEvent = false;
     if (m_clickNode) {
         if (currentHitTest.innerNode()) {
             // Updates distribution because a mouseup (or mousedown) event listener can make the
             // tree dirty at dispatchMouseEvent() invocation above.
             // Unless distribution is updated, commonAncestor would hit ASSERT.
             // Both m_clickNode and currentHitTest.innerNode()) don't need to be updated
             // because commonAncestor() will exit early if their documents are different.
             m_clickNode->document().updateDistributionForNodeIfNeeded(m_clickNode.get());
             Node* clickTargetNode = currentHitTest.innerNode()->commonAncestor(*m_clickNode, parentForClickEvent);
             swallowClickEvent = !dispatchMouseEvent(EventTypeNames::click, clickTargetNode, gestureEvent.tapCount(), fakeMouseUp, true);
         }
         m_clickNode = nullptr;
     }
 
     if (!swallowMouseUpEvent)
         swallowMouseUpEvent = handleMouseReleaseEvent(MouseEventWithHitTestResults(fakeMouseUp, currentHitTest));
 
     return swallowMouseDownEvent | swallowMouseUpEvent | swallowClickEvent;
 }
 
 bool EventHandler::handleGestureLongPress(const GestureEventWithHitTestResults& targetedEvent)
 {
     const PlatformGestureEvent& gestureEvent = targetedEvent.event();
     IntPoint adjustedPoint = gestureEvent.position();
 
+    unsigned modifiers = gestureEvent.modifiers();
+
     // FIXME: Ideally we should try to remove the extra mouse-specific hit-tests here (re-using the
     // supplied HitTestResult), but that will require some overhaul of the touch drag-and-drop code
     // and LongPress is such a special scenario that it's unlikely to matter much in practice.
 
     m_longTapShouldInvokeContextMenu = false;
     if (m_frame->settings() && m_frame->settings()->touchDragDropEnabled() && m_frame->view()) {
         PlatformMouseEvent mouseDownEvent(adjustedPoint, gestureEvent.globalPosition(), LeftButton, PlatformEvent::MousePressed, 1,
-            gestureEvent.shiftKey(), gestureEvent.ctrlKey(), gestureEvent.altKey(), gestureEvent.metaKey(), PlatformMouseEvent::FromTouch, WTF::currentTime());
+            static_cast<PlatformEvent::Modifiers>(modifiers | PlatformEvent::LeftButtonDown),
+            PlatformMouseEvent::FromTouch, WTF::currentTime());
         m_mouseDown = mouseDownEvent;
 
         PlatformMouseEvent mouseDragEvent(adjustedPoint, gestureEvent.globalPosition(), LeftButton, PlatformEvent::MouseMoved, 1,
-            gestureEvent.shiftKey(), gestureEvent.ctrlKey(), gestureEvent.altKey(), gestureEvent.metaKey(), PlatformMouseEvent::FromTouch, WTF::currentTime());
+            static_cast<PlatformEvent::Modifiers>(modifiers | PlatformEvent::LeftButtonDown),
+            PlatformMouseEvent::FromTouch, WTF::currentTime());
         HitTestRequest request(HitTestRequest::ReadOnly);
         MouseEventWithHitTestResults mev = prepareMouseEvent(request, mouseDragEvent);
         m_mouseDownMayStartDrag = true;
         dragState().m_dragSrc = nullptr;
         m_mouseDownPos = m_frame->view()->windowToContents(mouseDragEvent.position());
         RefPtrWillBeRawPtr<FrameView> protector(m_frame->view());
         if (handleDrag(mev, DragInitiator::Touch)) {
             m_longTapShouldInvokeContextMenu = true;
             return true;
         }
@@ skipping 485 matching lines @@
 #endif
 
     PlatformMouseEvent mouseEvent(position, globalPosition, RightButton, eventType, 1, false, false, false, false, PlatformMouseEvent::RealOrIndistinguishable, WTF::currentTime());
 
     handleMousePressEvent(mouseEvent);
     return sendContextMenuEvent(mouseEvent);
 }
 
 bool EventHandler::sendContextMenuEventForGesture(const GestureEventWithHitTestResults& targetedEvent)
 {
+    unsigned modifiers = targetedEvent.event().modifiers();
     PlatformEvent::Type eventType = PlatformEvent::MousePressed;
 
     if (m_frame->settings()->showContextMenuOnMouseUp())
         eventType = PlatformEvent::MouseReleased;
+    else
+        modifiers |= PlatformEvent::RightButtonDown;
 
-    PlatformMouseEvent mouseEvent(targetedEvent.event().position(), targetedEvent.event().globalPosition(), RightButton, eventType, 1, false, false, false, false, PlatformMouseEvent::FromTouch, WTF::currentTime());
+    PlatformMouseEvent mouseEvent(targetedEvent.event().position(), targetedEvent.event().globalPosition(), RightButton, eventType, 1,
+        static_cast<PlatformEvent::Modifiers>(modifiers),
+        PlatformMouseEvent::FromTouch, WTF::currentTime());
     // To simulate right-click behavior, we send a right mouse down and then
     // context menu event.
     // FIXME: Send HitTestResults to avoid redundant hit tests.
     handleMousePressEvent(mouseEvent);
     return sendContextMenuEvent(mouseEvent);
     // We do not need to send a corresponding mouse release because in case of
     // right-click, the context menu takes capture and consumes all events.
 }
 
 void EventHandler::scheduleHoverStateUpdate()
@@ skipping 1015 matching lines @@
 unsigned EventHandler::accessKeyModifiers()
 {
 #if OS(MACOSX)
     return PlatformEvent::CtrlKey | PlatformEvent::AltKey;
 #else
     return PlatformEvent::AltKey;
 #endif
 }
 
 } // namespace blink