template.js.tinymce.plugins.imagetools.classes.UndoStack.js Maven / Gradle / Ivy
/**
* UndoStack.js
*
* Released under LGPL License.
* Copyright (c) 1999-2015 Ephox Corp. All rights reserved
*
* License: http://www.tinymce.com/license
* Contributing: http://www.tinymce.com/contributing
*/
define("tinymce/imagetoolsplugin/UndoStack", [
], function() {
return function() {
var data = [], index = -1;
function add(state) {
var removed;
removed = data.splice(++index);
data.push(state);
return {
state: state,
removed: removed
};
}
function undo() {
if (canUndo()) {
return data[--index];
}
}
function redo() {
if (canRedo()) {
return data[++index];
}
}
function canUndo() {
return index > 0;
}
function canRedo() {
return index != -1 && index < data.length - 1;
}
return {
data: data,
add: add,
undo: undo,
redo: redo,
canUndo: canUndo,
canRedo: canRedo
};
};
});