Add sparse accessibility attribute interface to Blink

third_party/WebKit/Source/modules/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 308 matching lines @@
   TextStyleUnderline = 1 << 2,
   TextStyleLineThrough = 1 << 3
 };
 
 enum TextUnderElementMode {
   TextUnderElementAll,
   TextUnderElementAny  // If the text is unimportant, just whether or not it's
                        // present
 };
 
+enum class AXBoolAttribute {};
+
+enum class AXStringAttribute {};
+
+enum class AXObjectAttribute {
+  AriaActiveDescendant,
+};
+
+enum class AXObjectVectorAttribute {
+  AriaControls,
+  AriaFlowTo,
+};
+
+class AXSparseAttributeClient {
+ public:
+  virtual void addBoolAttribute(AXBoolAttribute, bool) = 0;
+  virtual void addStringAttribute(AXStringAttribute, const String&) = 0;
+  virtual void addObjectAttribute(AXObjectAttribute, AXObject&) = 0;
+  virtual void addObjectVectorAttribute(AXObjectVectorAttribute,
+                                        HeapVector<Member<AXObject>>&) = 0;
+};
+
 // The source of the accessible name of an element. This is needed
 // because on some platforms this determines how the accessible name
 // is exposed.
 enum AXNameFrom {
   AXNameFromUninitialized = -1,
   AXNameFromAttribute = 0,
   AXNameFromCaption,
   AXNameFromContents,
   AXNameFromPlaceholder,
   AXNameFromRelatedElement,
@@ skipping 226 matching lines @@
 
   // The AXObjectCacheImpl that owns this object, and its unique ID within this
   // cache.
   AXObjectCacheImpl& axObjectCache() const {
     ASSERT(m_axObjectCache);
     return *m_axObjectCache;
   }
 
   AXID axObjectID() const { return m_id; }
 
+  virtual void getSparseAXAttributes(AXSparseAttributeClient&) const {}
+
   // Determine subclass type.
   virtual bool isAXNodeObject() const { return false; }
   virtual bool isAXLayoutObject() const { return false; }
   virtual bool isAXListBox() const { return false; }
   virtual bool isAXListBoxOption() const { return false; }
   virtual bool isAXRadioInput() const { return false; }
   virtual bool isAXSVGRoot() const { return false; }
 
   // Check object role or purpose.
   virtual AccessibilityRole roleValue() const { return m_role; }
@@ skipping 234 matching lines @@
   virtual String ariaInvalidValue() const { return String(); }
   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(); }
 
   // ARIA attributes.
   virtual AXObject* activeDescendant() { return nullptr; }
   virtual String ariaAutoComplete() const { return String(); }
-  virtual void ariaFlowToElements(AXObjectVector&) const {}
-  virtual void ariaControlsElements(AXObjectVector&) const {}
   virtual void ariaOwnsElements(AXObjectVector& owns) const {}
   virtual void ariaDescribedbyElements(AXObjectVector&) const {}
   virtual void ariaLabelledbyElements(AXObjectVector&) const {}
   virtual bool ariaHasPopup() const { return false; }
   virtual bool isEditable() const { return false; }
   bool isMultiline() const;
   virtual bool isRichlyEditable() const { return false; }
   bool ariaPressedIsPresent() const;
   virtual AccessibilityRole ariaRoleAttribute() const { return UnknownRole; }
   virtual bool ariaRoleHasPresentationalChildren() const { return false; }
@@ skipping 237 matching lines @@
   static unsigned s_numberOfLiveAXObjects;
 };
 
 #define DEFINE_AX_OBJECT_TYPE_CASTS(thisType, predicate)           \
   DEFINE_TYPE_CASTS(thisType, AXObject, object, object->predicate, \
                     object.predicate)
 
 }  // namespace blink
 
 #endif  // AXObject_h