Implement MouseEvent buttons attribute.

Source/core/events/MouseEvent.cpp

 /*
  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2005, 2006, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 22 matching lines @@
 MouseEventInit::MouseEventInit()
     : screenX(0)
     , screenY(0)
     , clientX(0)
     , clientY(0)
     , ctrlKey(false)
     , altKey(false)
     , shiftKey(false)
     , metaKey(false)
     , button(0)
+    , buttons(0)
     , relatedTarget(nullptr)
 {
 }
 
 PassRefPtrWillBeRawPtr<MouseEvent> MouseEvent::create(const AtomicString& type, const MouseEventInit& initializer)
 {
     return adoptRefWillBeNoop(new MouseEvent(type, initializer));
 }
 
 PassRefPtrWillBeRawPtr<MouseEvent> MouseEvent::create(const AtomicString& eventType, PassRefPtrWillBeRawPtr<AbstractView> view, const PlatformMouseEvent& event, int detail, PassRefPtrWillBeRawPtr<Node> relatedTarget)
 {
     ASSERT(event.type() == PlatformEvent::MouseMoved || event.button() != NoButton);
 
     bool isMouseEnterOrLeave = eventType == EventTypeNames::mouseenter || eventType == EventTypeNames::mouseleave;
     bool isCancelable = !isMouseEnterOrLeave;
     bool isBubbling = !isMouseEnterOrLeave;
 
+    unsigned short buttons = 0;
+    if (eventType != EventTypeNames::contextmenu)

[Rick Byers, 2014/11/28 17:36:02]

why do you need to special case contextmenu here?  I don't think it should have
to be special in any way (it's just like click as an event that might be
generated as part of a MouseReleased platform event).

[zino, 2014/12/03 15:47:15]

This was for asking question to you.

Done.

+        buttons = platformModifiersToButtons(event.modifiers());
+
     return MouseEvent::create(
         eventType, isBubbling, isCancelable, view,
         detail, 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(), event.button(),
+        event.ctrlKey(), event.altKey(), event.shiftKey(), event.metaKey(), event.button(), buttons,
         relatedTarget, nullptr, false, event.syntheticEventType());
 }
 
 PassRefPtrWillBeRawPtr<MouseEvent> MouseEvent::create(const AtomicString& type, bool canBubble, bool cancelable, PassRefPtrWillBeRawPtr<AbstractView> view,
     int detail, int screenX, int screenY, int pageX, int pageY,
     int movementX, int movementY,
-    bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, unsigned short button,
+    bool ctrlKey, bool altKey, bool shiftKey, bool metaKey,
+    unsigned short button, unsigned short buttons,
     PassRefPtrWillBeRawPtr<EventTarget> relatedTarget, PassRefPtrWillBeRawPtr<DataTransfer> dataTransfer, bool isSimulated, PlatformMouseEvent::SyntheticEventType syntheticEventType)
 {
     return adoptRefWillBeNoop(new MouseEvent(type, canBubble, cancelable, view,
         detail, screenX, screenY, pageX, pageY,
         movementX, movementY,
-        ctrlKey, altKey, shiftKey, metaKey, button, relatedTarget, dataTransfer, isSimulated, syntheticEventType));
+        ctrlKey, altKey, shiftKey, metaKey, button, buttons,
+        relatedTarget, dataTransfer, isSimulated, syntheticEventType));
 }
 
 MouseEvent::MouseEvent()
     : m_button(0)
+    , m_buttons(0)
     , m_buttonDown(false)
 {
 }
 
 MouseEvent::MouseEvent(const AtomicString& eventType, bool canBubble, bool cancelable, PassRefPtrWillBeRawPtr<AbstractView> view,
     int detail, int screenX, int screenY, int pageX, int pageY,
     int movementX, int movementY,
     bool ctrlKey, bool altKey, bool shiftKey, bool metaKey,
-    unsigned short button, PassRefPtrWillBeRawPtr<EventTarget> relatedTarget,
+    unsigned short button, unsigned short buttons, PassRefPtrWillBeRawPtr<EventTarget> relatedTarget,
     PassRefPtrWillBeRawPtr<DataTransfer> dataTransfer, bool isSimulated, PlatformMouseEvent::SyntheticEventType syntheticEventType)
     : MouseRelatedEvent(eventType, canBubble, cancelable, view, detail, IntPoint(screenX, screenY),
                         IntPoint(pageX, pageY),
                         IntPoint(movementX, movementY),
                         ctrlKey, altKey, shiftKey, metaKey, isSimulated)
     , m_button(button == (unsigned short)-1 ? 0 : button)
+    , m_buttons(buttons)
     , m_buttonDown(button != (unsigned short)-1)
     , m_relatedTarget(relatedTarget)
     , m_dataTransfer(dataTransfer)
     , m_syntheticEventType(syntheticEventType)
 {
 }
 
 MouseEvent::MouseEvent(const AtomicString& eventType, const MouseEventInit& initializer)
     : MouseRelatedEvent(eventType, initializer.bubbles, initializer.cancelable, initializer.view, initializer.detail, IntPoint(initializer.screenX, initializer.screenY),
         IntPoint(0 /* pageX */, 0 /* pageY */),
         IntPoint(0 /* movementX */, 0 /* movementY */),
         initializer.ctrlKey, initializer.altKey, initializer.shiftKey, initializer.metaKey, false /* isSimulated */)
     , m_button(initializer.button == (unsigned short)-1 ? 0 : initializer.button)
+    , m_buttons(initializer.buttons)
     , m_buttonDown(initializer.button != (unsigned short)-1)
     , m_relatedTarget(initializer.relatedTarget)
     , m_dataTransfer(nullptr)
 {
     initCoordinates(IntPoint(initializer.clientX, initializer.clientY));
 }
 
 MouseEvent::~MouseEvent()
 {
 }
 
+unsigned short MouseEvent::platformModifiersToButtons(unsigned modifiers)
+{
+    unsigned short buttons = 0;
+
+    if (modifiers & PlatformEvent::LeftButtonDown)
+        buttons |= 1;
+    if (modifiers & PlatformEvent::RightButtonDown)
+        buttons |= 2;
+    if (modifiers & PlatformEvent::MiddleButtonDown)
+        buttons |= 4;
+
+    return buttons;
+}
+
 void MouseEvent::initMouseEvent(const AtomicString& type, bool canBubble, bool cancelable, PassRefPtrWillBeRawPtr<AbstractView> view,
                                 int detail, int screenX, int screenY, int clientX, int clientY,
                                 bool ctrlKey, bool altKey, bool shiftKey, bool metaKey,
-                                unsigned short button, PassRefPtrWillBeRawPtr<EventTarget> relatedTarget)
+                                unsigned short button, PassRefPtrWillBeRawPtr<EventTarget> relatedTarget, unsigned short buttons)
 {
     if (dispatched())
         return;
 
     initUIEvent(type, canBubble, cancelable, view, detail);
 
     m_screenLocation = IntPoint(screenX, screenY);
     m_ctrlKey = ctrlKey;
     m_altKey = altKey;
     m_shiftKey = shiftKey;
     m_metaKey = metaKey;
     m_button = button == (unsigned short)-1 ? 0 : button;
     m_buttonDown = button != (unsigned short)-1;
     m_relatedTarget = relatedTarget;
+    m_buttons = buttons;
 
     initCoordinates(IntPoint(clientX, clientY));
 
     // FIXME: m_isSimulated is not set to false here.
     // FIXME: m_dataTransfer is not set to nullptr here.
 }
 
 const AtomicString& MouseEvent::interfaceName() const
 {
     return EventNames::MouseEvent;
@@ skipping 49 matching lines @@
 PassRefPtrWillBeRawPtr<SimulatedMouseEvent> SimulatedMouseEvent::create(const AtomicString& eventType, PassRefPtrWillBeRawPtr<AbstractView> view, PassRefPtrWillBeRawPtr<Event> underlyingEvent)
 {
     return adoptRefWillBeNoop(new SimulatedMouseEvent(eventType, view, underlyingEvent));
 }
 
 SimulatedMouseEvent::~SimulatedMouseEvent()
 {
 }
 
 SimulatedMouseEvent::SimulatedMouseEvent(const AtomicString& eventType, PassRefPtrWillBeRawPtr<AbstractView> view, PassRefPtrWillBeRawPtr<Event> underlyingEvent)
-    : MouseEvent(eventType, true, true, view, 0, 0, 0, 0, 0, 0, 0, false, false, false, false, 0,
+    : MouseEvent(eventType, true, true, view, 0, 0, 0, 0, 0, 0, 0, false, false, false, false, 0, 0,
         nullptr, nullptr, true, PlatformMouseEvent::RealOrIndistinguishable)
 {
     if (UIEventWithKeyState* keyStateEvent = findEventWithKeyState(underlyingEvent.get())) {
         m_ctrlKey = keyStateEvent->ctrlKey();
         m_altKey = keyStateEvent->altKey();
         m_shiftKey = keyStateEvent->shiftKey();
         m_metaKey = keyStateEvent->metaKey();
     }
     setUnderlyingEvent(underlyingEvent);
 
@@ skipping 46 matching lines @@
     bool swallowEvent = event()->defaultHandled() || event()->defaultPrevented();
 
     if (event()->type() != EventTypeNames::click || event()->detail() != 2)
         return !swallowEvent;
 
     // Special case: If it's a double click event, we also send the dblclick event. This is not part
     // of the DOM specs, but is used for compatibility with the ondblclick="" attribute. This is treated
     // as a separate event in other DOM-compliant browsers like Firefox, and so we do the same.
     RefPtrWillBeRawPtr<MouseEvent> doubleClickEvent = MouseEvent::create();
     doubleClickEvent->initMouseEvent(EventTypeNames::dblclick, event()->bubbles(), event()->cancelable(), event()->view(),
-                                     event()->detail(), event()->screenX(), event()->screenY(), event()->clientX(), event()->clientY(),
-                                     event()->ctrlKey(), event()->altKey(), event()->shiftKey(), event()->metaKey(),
-                                     event()->button(), relatedTarget);
+        event()->detail(), event()->screenX(), event()->screenY(), event()->clientX(), event()->clientY(),
+        event()->ctrlKey(), event()->altKey(), event()->shiftKey(), event()->metaKey(),
+        event()->button(), relatedTarget, event()->buttons());
     if (event()->defaultHandled())
         doubleClickEvent->setDefaultHandled();
     EventDispatcher::dispatchEvent(dispatcher->node(), MouseEventDispatchMediator::create(doubleClickEvent));
     if (doubleClickEvent->defaultHandled() || doubleClickEvent->defaultPrevented())
         return false;
     return !swallowEvent;
 }
 
 } // namespace blink