Bug 725644 - add new nsIAccessibleHideEvent interface, r=tbsaunde

accessible/public/nsIAccessibleEvent.idl

@@ -529,6 +529,25 @@ interface nsIAccessibleTextChangeEvent : nsISupports
   readonly attribute DOMString modifiedText;
 };
 
+[scriptable, uuid(a2bd2eca-3afa-489b-afb2-f93ef32ad99c)]
+interface nsIAccessibleHideEvent: nsISupports
+{
+  /**
+   * Return an accessible that was a parent of the target.
+   */
+  readonly attribute nsIAccessible targetParent;
+
+  /**
+   * Return an accessible that was a next sibling of the target
+   */
+  readonly attribute nsIAccessible targetNextSibling;
+
+  /**
+   * Return an accessible that was a parent of the target
+   */
+  readonly attribute nsIAccessible targetPrevSibling;
+};
+
 [scriptable, uuid(5675c486-a230-4d85-a4bd-33670826d5ff)]
 interface nsIAccessibleCaretMoveEvent: nsISupports
 {

accessible/src/base/AccEvent.cpp

@@ -291,6 +291,14 @@ AccHideEvent::
   mPrevSibling = mAccessible->PrevSibling();
 }
 
+already_AddRefed<nsAccEvent>
+AccHideEvent::CreateXPCOMObject()
+{
+  nsAccEvent* event = new nsAccHideEvent(this);
+  NS_ADDREF(event);
+  return event;
+}
+
 
 ////////////////////////////////////////////////////////////////////////////////
 // AccShowEvent

accessible/src/base/AccEvent.h

@@ -270,12 +270,19 @@ public:
   AccHideEvent(nsAccessible* aTarget, nsINode* aTargetNode);
 
   // Event
+  virtual already_AddRefed<nsAccEvent> CreateXPCOMObject();
+
   static const EventGroup kEventGroup = eHideEvent;
   virtual unsigned int GetEventGroups() const
   {
     return AccMutationEvent::GetEventGroups() | (1U << eHideEvent);
   }
 
+  // AccHideEvent
+  nsAccessible* TargetParent() const { return mParent; }
+  nsAccessible* TargetNextSibling() const { return mNextSibling; }
+  nsAccessible* TargetPrevSibling() const { return mPrevSibling; }
+
 protected:
   nsRefPtr<nsAccessible> mParent;
   nsRefPtr<nsAccessible> mNextSibling;

accessible/src/xpcom/nsAccEvent.cpp

@@ -173,6 +173,44 @@ nsAccTextChangeEvent::GetModifiedText(nsAString& aModifiedText)
 }
 
 
+////////////////////////////////////////////////////////////////////////////////
+// nsAccHideEvent
+////////////////////////////////////////////////////////////////////////////////
+
+NS_IMPL_ISUPPORTS_INHERITED1(nsAccHideEvent, nsAccEvent,
+                             nsIAccessibleHideEvent)
+
+NS_IMETHODIMP
+nsAccHideEvent::GetTargetParent(nsIAccessible** aAccessible)
+{
+  NS_ENSURE_ARG_POINTER(aAccessible);
+
+  NS_IF_ADDREF(*aAccessible =
+    static_cast<AccHideEvent*>(mEvent.get())->TargetParent());
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsAccHideEvent::GetTargetNextSibling(nsIAccessible** aAccessible)
+{
+  NS_ENSURE_ARG_POINTER(aAccessible);
+
+  NS_IF_ADDREF(*aAccessible =
+    static_cast<AccHideEvent*>(mEvent.get())->TargetNextSibling());
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsAccHideEvent::GetTargetPrevSibling(nsIAccessible** aAccessible)
+{
+  NS_ENSURE_ARG_POINTER(aAccessible);
+
+  NS_IF_ADDREF(*aAccessible =
+    static_cast<AccHideEvent*>(mEvent.get())->TargetPrevSibling());
+  return NS_OK;
+}
+
+
 ////////////////////////////////////////////////////////////////////////////////
 // nsAccCaretMoveEvent
 ////////////////////////////////////////////////////////////////////////////////

accessible/src/xpcom/nsAccEvent.h

@@ -105,6 +105,26 @@ private:
 };
 
 
+/**
+ * Accessible hide event.
+ */
+class nsAccHideEvent : public nsAccEvent,
+                       public nsIAccessibleHideEvent
+{
+public:
+  nsAccHideEvent(AccHideEvent* aEvent) : nsAccEvent(aEvent) { }
+  virtual ~nsAccHideEvent() { }
+
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_NSIACCESSIBLEHIDEEVENT
+
+private:
+  nsAccHideEvent() MOZ_DELETE;
+  nsAccHideEvent(const nsAccHideEvent&) MOZ_DELETE;
+  nsAccHideEvent& operator =(const nsAccHideEvent&) MOZ_DELETE;
+};
+
+
 /**
  * Accessible caret move event.
  */