Support navigation within editable nodes.

chrome/browser/resources/chromeos/chromevox/cvox2/background/cursors.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview Classes related to cursors that point to and select parts of
  * the automation tree.
  */
 
 goog.provide('cursors.Cursor');
@@ skipping 122 matching lines @@
 
   /**
    * A node appropriate for making selections.
    * @return {AutomationNode}
    * @private
    */
   get selectionNode_() {
     if (!this.node)
       return null;
 
-    if (this.node.role == RoleType.inlineTextBox ||
-        this.index == cursors.NODE_INDEX)
+    if (this.node.role == RoleType.inlineTextBox)
       return this.node.parent;
 
     return this.node;
   },
 
   /**
    * An index appropriate for making selections.  If this cursor has a
    * cursors.NODE_INDEX index, the selection index is a node offset e.g. the
    * index in parent. If not, the index is a character offset.
    * @return {number}
    * @private
    */
   get selectionIndex_() {
     var adjustedIndex = this.index_;
     if (this.node.role == RoleType.inlineTextBox) {
       if (adjustedIndex == cursors.NODE_INDEX)
         adjustedIndex = 0;
 
       var sibling = this.node.previousSibling;
       while (sibling) {
         adjustedIndex += sibling.name.length;
         sibling = sibling.previousSibling;
       }
-
-      // Work around Blink's somewhat unexpected offset calculation which
-      // requires us to consider all previous siblings of the parenting static
-      // text.
-      var parent = this.node.parent;
-      if (parent.role == RoleType.staticText) {
-        sibling = parent.previousSibling;
-        while (sibling) {
-          if (sibling.name)
-            adjustedIndex += sibling.name.length;
-          sibling = sibling.previousSibling;
-        }
-      }
     } else if (this.index_ == cursors.NODE_INDEX) {
-      if (this.index_ == cursors.NODE_INDEX) {
-        // Translate the index into a selection on the parent.
-        if (this.node.parent)
-          adjustedIndex = this.node.indexInParent;
-      }
+      // Indicies of this kind are buggy. Set it to 0 (different than the DOM
+      // index in parent convention).
+      adjustedIndex = 0;
     }
     return adjustedIndex;
   },
 
   /**
    * Gets the accessible text of the node associated with this cursor.
    *
    * @param {!AutomationNode=} opt_node Use this node rather than this cursor's
    * node.
    * @return {string}
@@ skipping 385 matching lines @@
   /**
    * Select the text contained within this range.
    */
   select: function() {
     var startNode = this.start.selectionNode_;
     var endNode = this.end.selectionNode_;
 
     if (!startNode || !endNode)
       return;
 
-    // Find the most common root.
-    var uniqueAncestors = AutomationUtil.getUniqueAncestors(startNode, endNode);
-    var mcr = startNode.root;
-    if (uniqueAncestors) {
-      var common = uniqueAncestors.pop().parent;
-      if (common)
-        mcr = common.root;
-    }
-
-    if (!mcr || mcr.role == RoleType.desktop)
-      return;
-
-    if (mcr === startNode.root && mcr === endNode.root) {
-      var startIndex = this.start.selectionIndex_;
-
+    // Only allow selections within the same web tree.
+    if (startNode.root &&
+        startNode.root.role == RoleType.rootWebArea &&
+        startNode.root == endNode.root) {
       // We want to adjust to select the entire node for node offsets;
       // otherwise, use the plain character offset.
+      var startIndex = this.start.selectionIndex_;
       var endIndex = this.end.index == cursors.NODE_INDEX ?
           this.end.selectionIndex_ + 1 : this.end.selectionIndex_;
 
       chrome.automation.setDocumentSelection(
           { anchorObject: startNode,
             anchorOffset: startIndex,
             focusObject: endNode,
             focusOffset: endIndex }
       );
     }
@@ skipping 12 matching lines @@
   /**
    * Returns whether this range has valid start and end cursors.
    * @return {boolean}
    */
   isValid: function() {
     return this.start.isValid() && this.end.isValid();
   }
 };
 
 });  // goog.scope