plotly.js
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The open source javascript graphing library that powers plotly
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JavaScript
/**
* Copyright 2012-2020, Plotly, Inc.
* All rights reserved.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
;
// Modified from https://github.com/ArthurClemens/Javascript-Undo-Manager
// Copyright (c) 2010-2013 Arthur Clemens, arthur@visiblearea.com
module.exports = function UndoManager() {
var undoCommands = [];
var index = -1;
var isExecuting = false;
var callback;
function execute(command, action) {
if(!command) return this;
isExecuting = true;
command[action]();
isExecuting = false;
return this;
}
return {
add: function(command) {
if(isExecuting) return this;
undoCommands.splice(index + 1, undoCommands.length - index);
undoCommands.push(command);
index = undoCommands.length - 1;
return this;
},
setCallback: function(callbackFunc) { callback = callbackFunc; },
undo: function() {
var command = undoCommands[index];
if(!command) return this;
execute(command, 'undo');
index -= 1;
if(callback) callback(command.undo);
return this;
},
redo: function() {
var command = undoCommands[index + 1];
if(!command) return this;
execute(command, 'redo');
index += 1;
if(callback) callback(command.redo);
return this;
},
clear: function() {
undoCommands = [];
index = -1;
},
hasUndo: function() { return index !== -1; },
hasRedo: function() { return index < (undoCommands.length - 1); },
getCommands: function() { return undoCommands; },
getPreviousCommand: function() { return undoCommands[index - 1]; },
getIndex: function() { return index; }
};
};