/**

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* @class elFinder command "undo"

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* Undo previous commands

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*

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* @author Naoki Sawada

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**/

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elFinder.prototype.commands.undo = function() {

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"use strict";

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var self = this,

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fm = this.fm,

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setTitle = function(undo) {

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if (undo) {

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self.title = fm.i18n('cmdundo') + ' ' + fm.i18n('cmd'+undo.cmd);

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self.state = 0;

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} else {

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self.title = fm.i18n('cmdundo');

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self.state = -1;

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}

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self.change();

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},

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cmds = [];

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this.alwaysEnabled = true;

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this.updateOnSelect = false;

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this.shortcuts = [{

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pattern : 'ctrl+z'

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}];

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this.syncTitleOnChange = true;

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this.getstate = function() {

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return cmds.length? 0 : -1;

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};

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this.setUndo = function(undo, redo) {

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var _undo = {};

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if (undo) {

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if ($.isPlainObject(undo) && undo.cmd && undo.callback) {

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Object.assign(_undo, undo);

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if (redo) {

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delete redo.undo;

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_undo.redo = redo;

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} else {

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fm.getCommand('redo').setRedo(null);

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}

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cmds.push(_undo);

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setTitle(_undo);

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}

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}

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};

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this.exec = function() {

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var redo = fm.getCommand('redo'),

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dfd = $.Deferred(),

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undo, res, _redo = {};

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if (cmds.length) {

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undo = cmds.pop();

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if (undo.redo) {

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Object.assign(_redo, undo.redo);

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delete undo.redo;

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} else {

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_redo = null;

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}

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dfd.done(function() {

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if (_redo) {

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redo.setRedo(_redo, undo);

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}

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});

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setTitle(cmds.length? cmds[cmds.length-1] : void(0));

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res = undo.callback();

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if (res && res.done) {

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res.done(function() {

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dfd.resolve();

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}).fail(function() {

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dfd.reject();

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});

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} else {

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dfd.resolve();

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}

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if (cmds.length) {

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this.update(0, cmds[cmds.length - 1].name);

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} else {

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this.update(-1, '');

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}

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} else {

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dfd.reject();

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}

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return dfd;

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};

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fm.bind('exec', function(e) {

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var data = e.data || {};

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if (data.opts && data.opts._userAction) {

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if (data.dfrd && data.dfrd.done) {

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data.dfrd.done(function(res) {

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if (res && res.undo && res.redo) {

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res.undo.redo = res.redo;

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self.setUndo(res.undo);

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}

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});

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}

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}

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});

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};

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/**

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* @class elFinder command "redo"

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* Redo previous commands

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*

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* @author Naoki Sawada

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**/

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elFinder.prototype.commands.redo = function() {

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"use strict";

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var self = this,

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fm = this.fm,

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setTitle = function(redo) {

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if (redo && redo.callback) {

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self.title = fm.i18n('cmdredo') + ' ' + fm.i18n('cmd'+redo.cmd);

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self.state = 0;

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} else {

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self.title = fm.i18n('cmdredo');

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self.state = -1;

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}

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self.change();

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},

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cmds = [];

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this.alwaysEnabled = true;

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this.updateOnSelect = false;

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this.shortcuts = [{

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pattern : 'shift+ctrl+z ctrl+y'

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}];

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this.syncTitleOnChange = true;

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this.getstate = function() {

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return cmds.length? 0 : -1;

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};

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this.setRedo = function(redo, undo) {

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if (redo === null) {

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cmds = [];

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setTitle();

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} else {

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if (redo && redo.cmd && redo.callback) {

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if (undo) {

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redo.undo = undo;

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}

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cmds.push(redo);

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setTitle(redo);

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}

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}

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};

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this.exec = function() {

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var undo = fm.getCommand('undo'),

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dfd = $.Deferred(),

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redo, res, _undo = {}, _redo = {};

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if (cmds.length) {

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redo = cmds.pop();

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if (redo.undo) {

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Object.assign(_undo, redo.undo);

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Object.assign(_redo, redo);

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delete _redo.undo;

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dfd.done(function() {

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undo.setUndo(_undo, _redo);

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});

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}

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setTitle(cmds.length? cmds[cmds.length-1] : void(0));

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res = redo.callback();

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if (res && res.done) {

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res.done(function() {

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dfd.resolve();

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}).fail(function() {

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dfd.reject();

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});

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} else {

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dfd.resolve();

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}

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return dfd;

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} else {

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return dfd.reject();

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}

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};

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};

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