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// Copyright 2008 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 Code for an UndoRedoState interface representing an undo and
* redo action for a particular state change. To be used by
* {@link goog.editor.plugins.UndoRedoManager}.
*
*/
goog.provide('goog.editor.plugins.UndoRedoState');
goog.require('goog.events.EventTarget');
/**
* Represents an undo and redo action for a particular state transition.
*
* @param {boolean} asynchronous Whether the undo or redo actions for this
* state complete asynchronously. If true, then this state must fire
* an ACTION_COMPLETED event when undo or redo is complete.
* @constructor
* @extends {goog.events.EventTarget}
*/
goog.editor.plugins.UndoRedoState = function(asynchronous) {
/**
* Indicates if the undo or redo actions for this state complete
* asynchronously.
* @type {boolean}
* @private
*/
this.asynchronous_ = asynchronous;
};
goog.inherits(goog.editor.plugins.UndoRedoState, goog.events.EventTarget);
/**
* Event type for events indicating that this state has completed an undo or
* redo operation.
*/
goog.editor.plugins.UndoRedoState.ACTION_COMPLETED = 'action_completed';
/**
* @return {boolean} Whether or not the undo and redo actions of this state
* complete asynchronously. If true, the state will fire an ACTION_COMPLETED
* event when an undo or redo action is complete.
*/
goog.editor.plugins.UndoRedoState.prototype.isAsynchronous = function() {
return this.asynchronous_;
};
/**
* Undoes the action represented by this state.
*/
goog.editor.plugins.UndoRedoState.prototype.undo = goog.abstractMethod;
/**
* Redoes the action represented by this state.
*/
goog.editor.plugins.UndoRedoState.prototype.redo = goog.abstractMethod;
/**
* Checks if two undo-redo states are the same.
* @param {goog.editor.plugins.UndoRedoState} state The state to compare.
* @return {boolean} Wether the two states are equal.
*/
goog.editor.plugins.UndoRedoState.prototype.equals = goog.abstractMethod;
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