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// 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 Simple class to represent a cursor location in the document.
*/
goog.provide('cvox.Cursor');
/**
* A class to represent a cursor location in the document,
* like the start position or end position of a selection range.
*
* Later this may be extended to support "virtual text" for an object,
* like the ALT text for an image.
*
* Note: we cache the text of a particular node at the time we
* traverse into it. Later we should add support for dynamically
* reloading it.
* NOTE: Undefined behavior if node is null
* @param {Node} node The DOM node.
* @param {number} index The index of the character within the node.
* @param {string} text The cached text contents of the node.
* @constructor
*/
cvox.Cursor = function(node, index, text) {
this.node = node;
this.index = index;
this.text = text;
};
/**
* @return {!cvox.Cursor} A new cursor pointing to the same location.
*/
cvox.Cursor.prototype.clone = function() {
return new cvox.Cursor(this.node, this.index, this.text);
};
/**
* Modify this cursor to point to the location that another cursor points to.
* @param {!cvox.Cursor} otherCursor The cursor to copy from.
*/
cvox.Cursor.prototype.copyFrom = function(otherCursor) {
this.node = otherCursor.node;
this.index = otherCursor.index;
this.text = otherCursor.text;
};
/**
* Check for equality.
* @param {!cvox.Cursor} rhs The cursor to compare against.
* @return {boolean} True if equal.
*/
cvox.Cursor.prototype.equals = function(rhs) {
return this.node == rhs.node &&
this.index == rhs.index &&
this.text == rhs.text;
};
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