Implements the ability to get and set the caret position and the current selection from anywhere in…

Source/modules/accessibility/AXObject.h

Index: Source/modules/accessibility/AXObject.h
diff --git a/Source/modules/accessibility/AXObject.h b/Source/modules/accessibility/AXObject.h
index 1fa46b3d1990e4d919b171cf63a6b0299dc030a8..e7b8b68e6aee319a5d2ebdc2722ce360aefdece1 100644
--- a/Source/modules/accessibility/AXObject.h
+++ b/Source/modules/accessibility/AXObject.h
@@ -355,22 +355,44 @@ class MODULES_EXPORT AXObject : public RefCounted<AXObject> {
 public:
     typedef Vector<RefPtr<AXObject>> AccessibilityChildrenVector;
 
-    struct PlainTextRange {
-
-        unsigned start;
-        unsigned length;
+    struct AXSelection {
+        // The ID of the deepest descendant in which the selection starts.
+        // (A value of 0 means the current object.)
+        AXID anchorId;
+        // The number of characters and child objects in the anchor object
+        // before the selection starts.
+        unsigned anchorOffset;
+        // The ID of the deepest descendant in which the selection ends.
+        // (A value of 0 means the current object.)
+        AXID focusId;
+        // The number of characters and child objects in the focus object
+        // before the selection ends.
+        unsigned focusOffset;
+
+        AXSelection()
+            : anchorId(0)
+            , anchorOffset(0)
+            , focusId(0)
+            , focusOffset(0)
+        { }
 
-        PlainTextRange()
-            : start(0)
-            , length(0)
+        AXSelection(unsigned startOffset, unsigned endOffset)
+            : anchorId(0)
+            , anchorOffset(startOffset)
+            , focusId(0)
+            , focusOffset(endOffset)
         { }
 
-        PlainTextRange(unsigned s, unsigned l)
-            : start(s)
-            , length(l)
+        AXSelection(AXID anchorId, unsigned anchorOffset, AXID focusId, unsigned focusOffset)
+            : anchorId(anchorId)
+            , anchorOffset(anchorOffset)
+            , focusId(focusId)
+            , focusOffset(focusOffset)
         { }
 
-        bool isNull() const { return !start && !length; }
+        bool isNull() const { return !anchorOffset && !focusOffset; }
+        bool hasAnchor() const { return !anchorId; }
+        bool hasFocus() const { return !focusId; }
     };
 
 protected:
@@ -583,7 +605,7 @@ public:
     // The integer horizontal pixel offset of each character in the string; negative values for RTL.
     virtual void textCharacterOffsets(Vector<int>&) const { }
     // The start and end character offset of each word in the inline text box.
-    virtual void wordBoundaries(Vector<PlainTextRange>& words) const { }
+    virtual void wordBoundaries(Vector<AXSelection>& words) const { }
 
     // Properties of interactive elements.
     virtual String actionVerb() const;
@@ -699,9 +721,8 @@ public:
     String language() const;
     bool hasAttribute(const QualifiedName&) const;
     const AtomicString& getAttribute(const QualifiedName&) const;
-
-    // Selected text.
-    virtual PlainTextRange selectedTextRange() const { return PlainTextRange(); }
+    virtual AXSelection selection() const { return AXSelection(); }
+    virtual AXSelection selectionUnderObject() const { return AXSelection(); }
 
     // Scrollable containers.
     bool isScrollableContainer() const;
@@ -727,7 +748,7 @@ public:
     virtual void setFocused(bool) { }
     virtual void setSelected(bool) { }
     void setSelectedText(const String&) { }
-    virtual void setSelectedTextRange(const PlainTextRange&) { }
+    virtual void setSelection(const AXSelection&) { }

[dmazzoni, 2015/06/16 17:24:04]

Why is setSelection implemented here but not exposed in WebAXObject?

     virtual void setValue(const String&) { }
     virtual void setValue(float) { }