Bug 920425 part.2 Implement mozilla::WidgetEvent::As*Event() methods r=roc

widget/shared/WidgetEventImpl.cpp

@@ -4,11 +4,38 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "mozilla/BasicEvents.h"
+#include "mozilla/ContentEvents.h"
 #include "mozilla/MiscEvents.h"
 #include "mozilla/MouseEvents.h"
+#include "mozilla/MutationEvent.h"
+#include "mozilla/TextEvents.h"
+#include "mozilla/TouchEvents.h"
 
 namespace mozilla {
 
+/******************************************************************************
+ * As*Event() implementation
+ ******************************************************************************/
+
+#define NS_ROOT_EVENT_CLASS(aPrefix, aName)
+#define NS_EVENT_CLASS(aPrefix, aName) \
+aPrefix##aName* \
+WidgetEvent::As##aName() \
+{ \
+  return nullptr; \
+} \
+\
+const aPrefix##aName* \
+WidgetEvent::As##aName() const \
+{ \
+  return const_cast<WidgetEvent*>(this)->As##aName(); \
+}
+
+#include "mozilla/EventClassList.h"
+
+#undef NS_EVENT_CLASS
+#undef NS_ROOT_EVENT_CLASS
+
 /******************************************************************************
  * mozilla::WidgetEvent
  *
@@ -18,26 +45,13 @@ namespace mozilla {
 bool
 WidgetEvent::IsInputDerivedEvent() const
 {
-  switch (eventStructType) {
-    case NS_INPUT_EVENT:
-    case NS_MOUSE_EVENT:
-    case NS_KEY_EVENT:
-    case NS_TOUCH_EVENT:
-    case NS_DRAG_EVENT:
-    case NS_MOUSE_SCROLL_EVENT:
-    case NS_WHEEL_EVENT:
-    case NS_SIMPLE_GESTURE_EVENT:
-      return true;
-    default:
-      return false;
-  }
+  return AsInputEvent() != nullptr;
 }
 
 bool
 WidgetEvent::IsMouseDerivedEvent() const
 {
-  return eventStructType == NS_MOUSE_EVENT ||
-         eventStructType == NS_DRAG_EVENT;
+  return AsMouseEvent() != nullptr;
 }
 
 bool
@@ -155,33 +169,31 @@ WidgetEvent::HasPluginActivationEventMessage() const
 bool
 WidgetEvent::IsLeftClickEvent() const
 {
-  return eventStructType == NS_MOUSE_EVENT &&
-         message == NS_MOUSE_CLICK &&
-         static_cast<const WidgetMouseEvent*>(this)->button ==
-           WidgetMouseEvent::eLeftButton;
+  const WidgetMouseEvent* mouseEvent = AsMouseEvent();
+  return mouseEvent && message == NS_MOUSE_CLICK &&
+         mouseEvent->button == WidgetMouseEvent::eLeftButton;
 }
 
 bool
 WidgetEvent::IsContextMenuKeyEvent() const
 {
-  return eventStructType == NS_MOUSE_EVENT &&
-         message == NS_CONTEXTMENU &&
-         static_cast<const WidgetMouseEvent*>(this)->context ==
-            WidgetMouseEvent::eContextMenuKey;
+  const WidgetMouseEvent* mouseEvent = AsMouseEvent();
+  return mouseEvent && message == NS_CONTEXTMENU &&
+         mouseEvent->context == WidgetMouseEvent::eContextMenuKey;
 }
 
 bool
 WidgetEvent::IsRetargetedNativeEventDelivererForPlugin() const
 {
-  return IsNativeEventDelivererForPlugin() &&
-    static_cast<const WidgetPluginEvent*>(this)->retargetToFocusedDocument;
+  const WidgetPluginEvent* pluginEvent = AsPluginEvent();
+  return pluginEvent && pluginEvent->retargetToFocusedDocument;
 }
 
 bool
 WidgetEvent::IsNonRetargetedNativeEventDelivererForPlugin() const
 {
-  return IsNativeEventDelivererForPlugin() &&
-    !static_cast<const WidgetPluginEvent*>(this)->retargetToFocusedDocument;
+  const WidgetPluginEvent* pluginEvent = AsPluginEvent();
+  return pluginEvent && !pluginEvent->retargetToFocusedDocument;
 }
 
 bool
@@ -228,14 +240,12 @@ WidgetEvent::IsAllowedToDispatchDOMEvent() const
       // DOM events.
       // Synthesized button up events also do not cause DOM events because they
       // do not have a reliable refPoint.
-      return static_cast<const WidgetMouseEvent*>(this)->reason ==
-               WidgetMouseEvent::eReal;
+      return AsMouseEvent()->reason == WidgetMouseEvent::eReal;
 
     case NS_WHEEL_EVENT: {
       // wheel event whose all delta values are zero by user pref applied, it
       // shouldn't cause a DOM event.
-      const WidgetWheelEvent* wheelEvent =
-        static_cast<const WidgetWheelEvent*>(this);
+      const WidgetWheelEvent* wheelEvent = AsWheelEvent();
       return wheelEvent->deltaX != 0.0 || wheelEvent->deltaY != 0.0 ||
              wheelEvent->deltaZ != 0.0;
     }