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https://bitbucket.org/wisemapping/wisemapping-frontend.git
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86 lines
2.7 KiB
JavaScript
86 lines
2.7 KiB
JavaScript
/*
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* Copyright [2015] [wisemapping]
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*
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* Licensed under WiseMapping Public License, Version 1.0 (the "License").
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* It is basically the Apache License, Version 2.0 (the "License") plus the
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* "powered by wisemapping" text requirement on every single page;
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the license at
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*
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* http://www.wisemapping.org/license
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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const DesignerUndoManager = new Class({
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initialize: function(fireChange) {
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this._undoQueue = [];
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this._redoQueue = [];
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this._baseId = 0;
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},
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enqueue:function(command) {
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$assert(command, "Command can not be null");
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var length = this._undoQueue.length;
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if (command.discardDuplicated && length > 0) {
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// Skip duplicated events ...
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var lastItem = this._undoQueue[length - 1];
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if (lastItem.discardDuplicated != command.discardDuplicated) {
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this._undoQueue.push(command);
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}
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} else {
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this._undoQueue.push(command);
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}
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this._redoQueue = [];
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},
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execUndo: function(commandContext) {
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if (this._undoQueue.length > 0) {
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var command = this._undoQueue.pop();
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this._redoQueue.push(command);
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command.undoExecute(commandContext);
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}
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},
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execRedo: function(commandContext) {
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if (this._redoQueue.length > 0) {
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var command = this._redoQueue.pop();
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this._undoQueue.push(command);
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command.execute(commandContext);
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}
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},
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buildEvent: function() {
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return {undoSteps: this._undoQueue.length, redoSteps:this._redoQueue.length};
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},
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markAsChangeBase: function() {
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var undoLength = this._undoQueue.length;
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if (undoLength > 0) {
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var command = this._undoQueue[undoLength - 1];
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this._baseId = command.getId();
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} else {
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this._baseId = 0;
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}
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},
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hasBeenChanged: function() {
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var result = true;
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var undoLength= this._undoQueue.length;
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if (undoLength == 0 && this._baseId == 0) {
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result = false;
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} else if (undoLength > 0) {
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var command = this._undoQueue[undoLength - 1];
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result = (this._baseId != command.getId());
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}
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return result;
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}
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});
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export default DesignerUndoManager;
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