Check whether aria-expanded attribute is defined

Source/core/accessibility/AXObject.h

 /*
  * Copyright (C) 2008, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nuanti Ltd.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 176 matching lines @@
     HelpText,
     VisibleText,
     TitleTagText,
     PlaceholderText,
     LabelByElementText,
 };
 
 enum AccessibilityState {
     AXBusyState,
     AXCheckedState,
-    AXCollapsedState,
     AXEnabledState,
     AXExpandedState,
     AXFocusableState,
     AXFocusedState,
     AXHaspopupState,
     AXHoveredState,
     AXIndeterminateState,
     AXInvisibleState,
     AXLinkedState,
     AXMultiselectableState,
@@ skipping 42 matching lines @@
     ButtonStateMixed,
 };
 
 enum AccessibilityTextDirection {
     AccessibilityTextDirectionLeftToRight,
     AccessibilityTextDirectionRightToLeft,
     AccessibilityTextDirectionTopToBottom,
     AccessibilityTextDirectionBottomToTop
 };
 
+enum AccessibilityExpanded {
+    ExpandedUndefined = 0,
+    ExpandedCollapsed,
+    ExpandedExpanded,
+};
+
 class AXObject : public RefCounted<AXObject> {
 public:
     typedef Vector<RefPtr<AXObject> > AccessibilityChildrenVector;
 
     struct PlainTextRange {
 
         unsigned start;
         unsigned length;
 
         PlainTextRange()
@@ skipping 88 matching lines @@
     bool isTextControl() const;
     bool isTree() const { return roleValue() == TreeRole; }
     bool isTreeItem() const { return roleValue() == TreeItemRole; }
     bool isWebArea() const { return roleValue() == WebAreaRole; }
 
     // Check object state.
     virtual bool isChecked() const { return false; }
     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; }
     virtual bool isLinked() const { return false; }
     virtual bool isLoaded() const { return false; }
     virtual bool isMultiSelectable() const { return false; }
     virtual bool isOffScreen() const { return false; }
     virtual bool isPressed() const { return false; }
     virtual bool isReadOnly() const { return false; }
     virtual bool isRequired() const { return false; }
@@ skipping 43 matching lines @@
     virtual String valueDescription() const { return String(); }
     virtual float valueForRange() const { return 0.0f; }
     virtual float maxValueForRange() const { return 0.0f; }
     virtual float minValueForRange() const { return 0.0f; }
     virtual String stringValue() const { return String(); }
     virtual const AtomicString& textInputType() const { return nullAtom; }
 
     // 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 { };
     virtual void ariaLabelledbyElements(AccessibilityChildrenVector& labelledby) const { };
     virtual void ariaOwnsElements(AccessibilityChildrenVector& owns) const { };
     virtual bool ariaHasPopup() const { return false; }
     bool ariaIsMultiline() const;
     virtual String ariaLabeledByAttribute() const { return String(); }
     bool ariaPressedIsPresent() const;
     virtual AccessibilityRole ariaRoleAttribute() const { return UnknownRole; }
@@ skipping 155 matching lines @@
     // functions called here may only search up the tree (ancestors), not down.
     void updateCachedAttributeValuesIfNeeded() const;
 };
 
 #define DEFINE_AX_OBJECT_TYPE_CASTS(thisType, predicate) \
     DEFINE_TYPE_CASTS(thisType, AXObject, object, object->predicate, object.predicate)
 
 } // namespace blink
 
 #endif // AXObject_h