bug 850981 - make AppendChild inline around InsertChildAt() r=surkov

accessible/src/atk/ApplicationAccessibleWrap.cpp

@@ -128,9 +128,9 @@ gboolean fireRootAccessibleAddedCB(gpointer data)
 }
 
 bool
-ApplicationAccessibleWrap::AppendChild(Accessible* aChild)
+ApplicationAccessibleWrap::InsertChildAt(uint32_t aIdx, Accessible* aChild)
 {
-  if (!ApplicationAccessible::AppendChild(aChild))
+  if (!ApplicationAccessible::InsertChildAt(aIdx, aChild))
     return false;
 
   AtkObject* atkAccessible = AccessibleWrap::GetAtkObject(aChild);

accessible/src/atk/ApplicationAccessibleWrap.h

@@ -20,7 +20,7 @@ public:
 
   // Accessible
   virtual mozilla::a11y::ENameValueFlag Name(nsString& aName);
-  virtual bool AppendChild(Accessible* aChild);
+  virtual bool InsertChildAt(uint32_t aIdx, Accessible* aChild) MOZ_OVERRIDE;
   virtual bool RemoveChild(Accessible* aChild);
 
   /**

accessible/src/generic/Accessible.cpp

@@ -2639,41 +2639,31 @@ Accessible::InvalidateChildren()
   SetChildrenFlag(eChildrenUninitialized);
 }
 
-bool
-Accessible::AppendChild(Accessible* aChild)
-{
-  if (!aChild)
-    return false;
-
-  if (!mChildren.AppendElement(aChild))
-    return false;
-
-  if (!nsAccUtils::IsEmbeddedObject(aChild))
-    SetChildrenFlag(eMixedChildren);
-
-  aChild->BindToParent(this, mChildren.Length() - 1);
-  return true;
-}
-
 bool
 Accessible::InsertChildAt(uint32_t aIndex, Accessible* aChild)
 {
   if (!aChild)
     return false;
 
-  if (!mChildren.InsertElementAt(aIndex, aChild))
-    return false;
+  if (aIndex == mChildren.Length()) {
+    if (!mChildren.AppendElement(aChild))
+      return false;
 
-  for (uint32_t idx = aIndex + 1; idx < mChildren.Length(); idx++) {
-    NS_ASSERTION(mChildren[idx]->mIndexInParent == idx - 1, "Accessible child index doesn't match");
-    mChildren[idx]->mIndexInParent = idx;
+  } else {
+    if (!mChildren.InsertElementAt(aIndex, aChild))
+      return false;
+
+    for (uint32_t idx = aIndex + 1; idx < mChildren.Length(); idx++) {
+      NS_ASSERTION(mChildren[idx]->mIndexInParent == idx - 1, "Accessible child index doesn't match");
+      mChildren[idx]->mIndexInParent = idx;
+    }
+
+    mEmbeddedObjCollector = nullptr;
   }
 
   if (!nsAccUtils::IsEmbeddedObject(aChild))
     SetChildrenFlag(eMixedChildren);
 
-  mEmbeddedObjCollector = nullptr;
-
   aChild->BindToParent(this, aIndex);
   return true;
 }

accessible/src/generic/Accessible.h

@@ -333,7 +333,8 @@ public:
   /**
    * Append/insert/remove a child. Return true if operation was successful.
    */
-  virtual bool AppendChild(Accessible* aChild);
+  bool AppendChild(Accessible* aChild)
+    { return InsertChildAt(mChildren.Length(), aChild); }
   virtual bool InsertChildAt(uint32_t aIndex, Accessible* aChild);
   virtual bool RemoveChild(Accessible* aChild);
 

accessible/src/generic/BaseAccessibles.cpp

@@ -43,13 +43,6 @@ LeafAccessible::ChildAtPoint(int32_t aX, int32_t aY,
   return this;
 }
 
-bool
-LeafAccessible::AppendChild(Accessible* aChild)
-{
-  NS_NOTREACHED("AppendChild called on leaf accessible!");
-  return false;
-}
-
 bool
 LeafAccessible::InsertChildAt(uint32_t aIndex, Accessible* aChild)
 {

accessible/src/generic/BaseAccessibles.h

@@ -34,8 +34,6 @@ public:
   // Accessible
   virtual Accessible* ChildAtPoint(int32_t aX, int32_t aY,
                                    EWhichChildAtPoint aWhichChild);
-  
-  virtual bool AppendChild(Accessible* aChild) MOZ_OVERRIDE MOZ_FINAL;
   virtual bool InsertChildAt(uint32_t aIndex, Accessible* aChild) MOZ_OVERRIDE MOZ_FINAL;
   virtual bool RemoveChild(Accessible* aChild) MOZ_OVERRIDE MOZ_FINAL;
 

accessible/src/generic/OuterDocAccessible.cpp

@@ -149,8 +149,10 @@ OuterDocAccessible::InvalidateChildren()
 }
 
 bool
-OuterDocAccessible::AppendChild(Accessible* aAccessible)
+OuterDocAccessible::InsertChildAt(uint32_t aIdx, Accessible* aAccessible)
 {
+  NS_ASSERTION(aAccessible->IsDoc(),
+               "OuterDocAccessible should only have document child!");
   // We keep showing the old document for a bit after creating the new one,
   // and while building the new DOM and frame tree. That's done on purpose
   // to avoid weird flashes of default background color.
@@ -159,7 +161,7 @@ OuterDocAccessible::AppendChild(Accessible* aAccessible)
   if (mChildren.Length())
     mChildren[0]->Shutdown();
 
-  if (!AccessibleWrap::AppendChild(aAccessible))
+  if (!AccessibleWrap::InsertChildAt(0, aAccessible))
     return false;
 
 #ifdef A11Y_LOG

accessible/src/generic/OuterDocAccessible.h

@@ -42,7 +42,7 @@ public:
                                    EWhichChildAtPoint aWhichChild);
 
   virtual void InvalidateChildren();
-  virtual bool AppendChild(Accessible* aAccessible);
+  virtual bool InsertChildAt(uint32_t aIdx, Accessible* aChild) MOZ_OVERRIDE;
   virtual bool RemoveChild(Accessible* aAccessible);
 
   // ActionAccessible

accessible/src/mac/AccessibleWrap.h

@@ -49,7 +49,7 @@ public: // construction, destruction
   virtual void Shutdown ();
   virtual void InvalidateChildren();
 
-  virtual bool AppendChild(Accessible* aAccessible);
+  virtual bool InsertChildAt(uint32_t aIdx, Accessible* aChild) MOZ_OVERRIDE;
   virtual bool RemoveChild(Accessible* aAccessible);
 
   virtual nsresult HandleAccEvent(AccEvent* aEvent);

accessible/src/mac/AccessibleWrap.mm

@@ -198,14 +198,13 @@ AccessibleWrap::InvalidateChildren()
 }
 
 bool
-AccessibleWrap::AppendChild(Accessible* aAccessible)
+AccessibleWrap::InsertChildAt(uint32_t aIdx, Accessible* aAccessible)
 {
-  bool appended = Accessible::AppendChild(aAccessible);
-  
-  if (appended && mNativeObject)
+  bool inserted = Accessible::InsertChildAt(aIdx, aAccessible);
+  if (inserted && mNativeObject)
     [mNativeObject appendChild:aAccessible];
 
-  return appended;
+  return inserted;
 }
 
 bool