Check whether aria-expanded attribute is defined

Source/core/accessibility/AXObject.h

Index: Source/core/accessibility/AXObject.h
diff --git a/Source/core/accessibility/AXObject.h b/Source/core/accessibility/AXObject.h
index cf853a6b877e6954ee4e395ebbeaeccbfe9ef805..416244f1b99d5a2a8d8c7a1d447d3f16fcee8920 100644
--- a/Source/core/accessibility/AXObject.h
+++ b/Source/core/accessibility/AXObject.h
@@ -194,7 +194,6 @@ enum AccessibilityTextSource {
 enum AccessibilityState {
     AXBusyState,
     AXCheckedState,
-    AXCollapsedState,
     AXEnabledState,
     AXExpandedState,
     AXFocusableState,
@@ -257,6 +256,12 @@ enum AccessibilityTextDirection {
     AccessibilityTextDirectionBottomToTop
 };
 
+enum AccessibilityExpanded {
+    ExpandedUndefined = 0,
+    ExpandedCollapsed,
+    ExpandedExpanded,
+};
+
 class AXObject : public RefCounted<AXObject> {
 public:
     typedef Vector<RefPtr<AXObject> > AccessibilityChildrenVector;
@@ -365,7 +370,6 @@ public:
     virtual bool isClickable() const;
     virtual bool isCollapsed() const { return false; }
     virtual bool isEnabled() const { return false; }
-    virtual bool isExpanded() const { return false; }
     virtual bool isFocused() const { return false; }
     virtual bool isHovered() const { return false; }
     virtual bool isIndeterminate() const { return false; }
@@ -429,6 +433,7 @@ public:
     // ARIA attributes.
     virtual AXObject* activeDescendant() const { return 0; }
     virtual String ariaDescribedByAttribute() const { return String(); }
+    virtual AccessibilityExpanded ariaExpanded() const { return ExpandedUndefined; }

[dmazzoni, 2014/10/29 07:46:59]

I think this should be called isExpanded or getExpanded, because it doesn't just
take ARIA into account, sometimes it uses native semantics too.

A function with "aria" in the name implies that it only returns ARIA properties.

[je_julie(Not used), 2014/10/29 13:07:27]

I updated API name with isExpanded.
On 2014/10/29 07:46:59, dmazzoni wrote:

     virtual void ariaFlowToElements(AccessibilityChildrenVector&) const { }
     virtual void ariaControlsElements(AccessibilityChildrenVector&) const { }
     virtual void ariaDescribedbyElements(AccessibilityChildrenVector& describedby) const { };