text: // Copyright 2009 The Closure Library Authors. All Rights Reserved.
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //      http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS-IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  /**
   * @fileoverview Definition of the Opera specific range wrapper.  Inherits most
   * functionality from W3CRange, but adds exceptions as necessary.
   *
   * DO NOT USE THIS FILE DIRECTLY.  Use goog.dom.Range instead.
   *
   */
  
  
  goog.provide('goog.dom.browserrange.OperaRange');
  
  goog.require('goog.dom.browserrange.W3cRange');
  
  
  
  /**
   * The constructor for Opera specific browser ranges.
   * @param {Range} range The range object.
   * @constructor
   * @extends {goog.dom.browserrange.W3cRange}
   * @final
   */
  goog.dom.browserrange.OperaRange = function(range) {
    goog.dom.browserrange.W3cRange.call(this, range);
  };
  goog.inherits(goog.dom.browserrange.OperaRange, goog.dom.browserrange.W3cRange);
  
  
  /**
   * Creates a range object that selects the given node's text.
   * @param {Node} node The node to select.
   * @return {goog.dom.browserrange.OperaRange} A Opera range wrapper object.
   */
  goog.dom.browserrange.OperaRange.createFromNodeContents = function(node) {
    return new goog.dom.browserrange.OperaRange(
        goog.dom.browserrange.W3cRange.getBrowserRangeForNode(node));
  };
  
  
  /**
   * Creates a range object that selects between the given nodes.
   * @param {Node} startNode The node to start with.
   * @param {number} startOffset The offset within the node to start.
   * @param {Node} endNode The node to end with.
   * @param {number} endOffset The offset within the node to end.
   * @return {goog.dom.browserrange.OperaRange} A wrapper object.
   */
  goog.dom.browserrange.OperaRange.createFromNodes = function(startNode,
      startOffset, endNode, endOffset) {
    return new goog.dom.browserrange.OperaRange(
        goog.dom.browserrange.W3cRange.getBrowserRangeForNodes(startNode,
            startOffset, endNode, endOffset));
  };
  
  
  /** @override */
  goog.dom.browserrange.OperaRange.prototype.selectInternal = function(
      selection, reversed) {
    // Avoid using addRange as we have to removeAllRanges first, which
    // blurs editable fields in Opera.
    selection.collapse(this.getStartNode(), this.getStartOffset());
    if (this.getEndNode() != this.getStartNode() ||
        this.getEndOffset() != this.getStartOffset()) {
      selection.extend(this.getEndNode(), this.getEndOffset());
    }
    // This can happen if the range isn't in an editable field.
    if (selection.rangeCount == 0) {
      selection.addRange(this.range_);
    }
  };
  