Bug 390154. Prune subtrees consistently across platform accessibility APIs for a number of widgets that we will impose a 'must be leaf' rule, to simplify compatibility across a number of assistive technologies which expect that. r=ginn.chen, a=dsicore

accessible/src/atk/nsAccessibleWrap.cpp

@@ -1550,8 +1550,3 @@ nsAccessibleWrap::FireAtkShowHideEvent(nsIAccessibleEvent *aEvent,
     return NS_OK;
 }
 
-PRBool nsAccessibleWrap::MustPrune(nsIAccessible *aAccessible)
-{
-  PRUint32 role = Role(aAccessible);
-  return role == nsIAccessibleRole::ROLE_GRAPHIC;
-}

accessible/src/atk/nsAccessibleWrap.h

@@ -115,9 +115,6 @@ public:
       return returnedString.get();
     }
 
-    // Should this accessible be allowed to have any ATK children
-    static PRBool MustPrune(nsIAccessible *aAccessible);
-
 protected:
     nsresult FireAtkStateChangeEvent(nsIAccessibleEvent *aEvent,
                                      AtkObject *aObject);

accessible/src/base/nsAccessible.cpp

@@ -3273,3 +3273,16 @@ nsAccessible::GetAttrValue(PRUint32 aNameSpaceID, nsIAtom *aName,
   return result;
 }
 
+PRBool nsAccessible::MustPrune(nsIAccessible *aAccessible)
+{ 
+  PRUint32 role = Role(aAccessible);
+  return role == nsIAccessibleRole::ROLE_MENUITEM || 
+         role == nsIAccessibleRole::ROLE_ENTRY ||
+         role == nsIAccessibleRole::ROLE_PASSWORD_TEXT ||
+         role == nsIAccessibleRole::ROLE_PUSHBUTTON ||
+         role == nsIAccessibleRole::ROLE_TOGGLE_BUTTON ||
+         role == nsIAccessibleRole::ROLE_GRAPHIC ||
+         role == nsIAccessibleRole::ROLE_SLIDER ||
+         role == nsIAccessibleRole::ROLE_PROGRESSBAR ||
+         role == nsIAccessibleRole::ROLE_SEPARATOR;
+}

accessible/src/base/nsAccessible.h

@@ -155,6 +155,10 @@ public:
   static PRInt32 TextLength(nsIAccessible *aAccessible); // Returns -1 on failure
   static PRBool IsLeaf(nsIAccessible *aAcc) { PRInt32 numChildren; aAcc->GetChildCount(&numChildren); return numChildren > 0; }
   static PRBool IsNodeRelevant(nsIDOMNode *aNode); // Is node something that could have an attached accessible
+  /**
+   * When exposing to platform accessibility APIs, should the children be pruned off?
+   */
+  static PRBool MustPrune(nsIAccessible *aAccessible);
   
   already_AddRefed<nsIAccessible> GetParent() {
     nsIAccessible *parent = nsnull;

accessible/src/mac/nsAccessibleWrap.h

@@ -79,19 +79,6 @@ class nsAccessibleWrap : public nsAccessible
 
     NS_IMETHOD FireAccessibleEvent(nsIAccessibleEvent *aEvent);
     
-    // we'll flatten buttons and checkboxes. usually they have a text node
-    // child, that is their title. Works in conjunction with IsPruned() below.
-    // XXX There is no IsPruned() method, so what does that comment mean?
-    PRBool IsFlat() {
-      PRUint32 role = Role(this);
-      return (role == nsIAccessibleRole::ROLE_CHECKBUTTON ||
-              role == nsIAccessibleRole::ROLE_PUSHBUTTON ||
-              role == nsIAccessibleRole::ROLE_TOGGLE_BUTTON ||
-              role == nsIAccessibleRole::ROLE_SPLITBUTTON ||
-              role == nsIAccessibleRole::ROLE_ENTRY ||
-              role == nsIAccessibleRole::ROLE_GRAPHIC);
-    }
-    
     // ignored means that the accessible might still have children, but is not displayed
     // to the user. it also has no native accessible object represented for it.
     PRBool IsIgnored();
@@ -119,10 +106,11 @@ class nsAccessibleWrap : public nsAccessible
       
       nsCOMPtr<nsIAccessible> curParent = GetParent();
       while (curParent) {
-        nsAccessibleWrap *ancestorWrap = static_cast<nsAccessibleWrap*>((nsIAccessible*)curParent.get());
-        if (ancestorWrap->IsFlat())
+        if (MustPrune(curParent))
           return PR_TRUE;
-        curParent = static_cast<nsAccessibleWrap*>((nsIAccessible*)curParent.get())->GetParent();
+        nsCOMPtr<nsIAccessible> newParent;
+        curParent->GetParent(getter_AddRefs(newParent));
+        curParent.swap(newParent);
       }
       // no parent was flat
       return PR_FALSE;

accessible/src/msaa/nsAccessibleWrap.cpp

@@ -1715,14 +1715,3 @@ void nsAccessibleWrap::UpdateSystemCaret()
     ::DeleteObject(caretBitMap);
   }
 }
-
-PRBool nsAccessibleWrap::MustPrune(nsIAccessible *aAccessible)
-{ 
-  PRUint32 role = Role(aAccessible);
-  return role == nsIAccessibleRole::ROLE_MENUITEM || 
-         role == nsIAccessibleRole::ROLE_ENTRY ||
-         role == nsIAccessibleRole::ROLE_PASSWORD_TEXT ||
-         role == nsIAccessibleRole::ROLE_PUSHBUTTON ||
-         role == nsIAccessibleRole::ROLE_TOGGLE_BUTTON ||
-         role == nsIAccessibleRole::ROLE_GRAPHIC;
-}

accessible/src/msaa/nsAccessibleWrap.h

@@ -322,9 +322,6 @@ protected:
   // nsIEnumVariant::Reset(), Skip() and Next().
   PRUint16 mEnumVARIANTPosition;
 
-  // Should this accessible be allowed to have any MSAA children
-  static PRBool MustPrune(nsIAccessible *aAccessible);
-
   enum navRelations {
     NAVRELATION_CONTROLLED_BY = 0x1000,
     NAVRELATION_CONTROLLER_FOR = 0x1001,