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115 lines
3.3 KiB
Plaintext
115 lines
3.3 KiB
Plaintext
"use strict";
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/*
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Copyright [2014] [Diagramo]
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Licensed under the Apache License, Version 2.0 (the "License");
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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/**
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* An facade to add Commands, undo and redo them.
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* It keeps a STACK of commands and can trigger undo actions in the system.
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* @this {History}
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* @constructor
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* @author Zack Newsham zack_newsham@yahoo.co.uk
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* @author Alex <alex@scriptoid.com>
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*
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* Interesting implementation in Java
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* @see http://download.oracle.com/javase/6/docs/api/javax/swing/undo/UndoManager.html
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*/
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function History(){
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}
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/**Object is a figure*/
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History.OBJECT_FIGURE = 0;
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/**Object is a connector*/
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History.OBJECT_CONNECTOR = 1;
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/**Object is a connection point*/
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History.OBJECT_CONNECTION_POINT = 2;
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/**Object is a generic object*/
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History.OBJECT_STATIC = 3;
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/**Object is a group
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*@deprecated
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**/
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History.OBJECT_GROUP = 4;
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/**Object is a glue*/
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History.OBJECT_GLUE = 5;
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/**Where the {Array} or commands is stored*/
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History.COMMANDS = [];
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/**The current command inde within the vector of undoable objects. At that position there will be a Command*/
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History.CURRENT_POINTER = -1;
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/* Add an action to the STACK of undoable actions.
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* We position at current pointer, remove everything after it and then add the new
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* action
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* @param {Command} command - the command History must store
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*/
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History.addUndo = function(command){
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if(doUndo){
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/**As we are now positioned on CURRENT_POINTER(where current Command is stored) we will
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*delete anything after it, add new Command and increase CURRENT_POINTER
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**/
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//remove commands after current command
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History.COMMANDS.splice(History.CURRENT_POINTER +1, History.COMMANDS.length);
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//add new command
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History.COMMANDS.push(command);
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//increase the current pointer
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History.CURRENT_POINTER++;
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}
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}
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/**Undo current command
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*TODO: nice to compress/merge some actions like many Translate in a row
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**/
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History.undo = function(){
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if(History.CURRENT_POINTER >= 0){
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Log.info('undo()->Type of action: ' + History.COMMANDS[History.CURRENT_POINTER].oType);
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History.COMMANDS[History.CURRENT_POINTER].undo();
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History.CURRENT_POINTER --;
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}
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}
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/**Redo a command
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*TODO: nice to compress/merge some actions like many Translate in a row
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**/
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History.redo = function(){
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if(History.CURRENT_POINTER + 1 < History.COMMANDS.length){
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Log.info('redo()->Type of action: ' + History.COMMANDS[History.CURRENT_POINTER+1].oType);
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History.COMMANDS[History.CURRENT_POINTER + 1].execute();
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History.CURRENT_POINTER++;
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}
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}
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/**Pack identical commands into a single, equivalend command.
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*It will pack only consecutive and same type commands (until a TurningPointCommand is founded)
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**/
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History.pack = function(){
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//TODO: implement
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}
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