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EDIT :: tiny_mce_popup.js

/**
 * tinymce_mce_popup.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
 */

var tinymce, tinyMCE;

/**
 * TinyMCE popup/dialog helper class. This gives you easy access to the
 * parent editor instance and a bunch of other things. It's higly recommended
 * that you load this script into your dialogs.
 *
 * @static
 * @class tinyMCEPopup
 */
var tinyMCEPopup = {
	/**
	 * Initializes the popup this will be called automatically.
	 *
	 * @method init
	 */
	init: function() {
		var self = this, parentWin, settings, uiWindow;

// Find window & API
		parentWin = self.getWin();
		tinymce = tinyMCE = parentWin.tinymce;
		self.editor = tinymce.EditorManager.activeEditor;
		self.params = self.editor.windowManager.getParams();

uiWindow = self.editor.windowManager.windows[self.editor.windowManager.windows.length - 1];
		self.features = uiWindow.features;
		self.uiWindow = uiWindow;

settings = self.editor.settings;

// Setup popup CSS path(s)
		if (settings.popup_css !== false) {
			if (settings.popup_css) {
				settings.popup_css = self.editor.documentBaseURI.toAbsolute(settings.popup_css);
			} else {
				settings.popup_css = self.editor.baseURI.toAbsolute("plugins/compat3x/css/dialog.css");
			}
		}

if (settings.popup_css_add) {
			settings.popup_css += ',' + self.editor.documentBaseURI.toAbsolute(settings.popup_css_add);
		}

// Setup local DOM
		self.dom = self.editor.windowManager.createInstance('tinymce.dom.DOMUtils', document, {
			ownEvents: true,
			proxy: tinyMCEPopup._eventProxy
		});

self.dom.bind(window, 'ready', self._onDOMLoaded, self);

// Enables you to skip loading the default css
		if (self.features.popup_css !== false) {
			self.dom.loadCSS(self.features.popup_css || self.editor.settings.popup_css);
		}

// Setup on init listeners
		self.listeners = [];

/**
		 * Fires when the popup is initialized.
		 *
		 * @event onInit
		 * @param {tinymce.Editor} editor Editor instance.
		 * @example
		 * // Alerts the selected contents when the dialog is loaded
		 * tinyMCEPopup.onInit.add(function(ed) {
		 *     alert(ed.selection.getContent());
		 * });
		 *
		 * // Executes the init method on page load in some object using the SomeObject scope
		 * tinyMCEPopup.onInit.add(SomeObject.init, SomeObject);
		 */
		self.onInit = {
			add: function(func, scope) {
				self.listeners.push({func : func, scope : scope});
			}
		};

self.isWindow = !self.getWindowArg('mce_inline');
		self.id = self.getWindowArg('mce_window_id');
	},

/**
	 * Returns the reference to the parent window that opened the dialog.
	 *
	 * @method getWin
	 * @return {Window} Reference to the parent window that opened the dialog.
	 */
	getWin: function() {
		// Added frameElement check to fix bug: #2817583
		return (!window.frameElement && window.dialogArguments) || opener || parent || top;
	},

/**
	 * Returns a window argument/parameter by name.
	 *
	 * @method getWindowArg
	 * @param {String} name Name of the window argument to retrieve.
	 * @param {String} defaultValue Optional default value to return.
	 * @return {String} Argument value or default value if it wasn't found.
	 */
	getWindowArg : function(name, defaultValue) {
		var value = this.params[name];

return tinymce.is(value) ? value : defaultValue;
	},

/**
	 * Returns a editor parameter/config option value.
	 *
	 * @method getParam
	 * @param {String} name Name of the editor config option to retrieve.
	 * @param {String} defaultValue Optional default value to return.
	 * @return {String} Parameter value or default value if it wasn't found.
	 */
	getParam : function(name, defaultValue) {
		return this.editor.getParam(name, defaultValue);
	},

/**
	 * Returns a language item by key.
	 *
	 * @method getLang
	 * @param {String} name Language item like mydialog.something.
	 * @param {String} defaultValue Optional default value to return.
	 * @return {String} Language value for the item like "my string" or the default value if it wasn't found.
	 */
	getLang : function(name, defaultValue) {
		return this.editor.getLang(name, defaultValue);
	},

/**
	 * Executed a command on editor that opened the dialog/popup.
	 *
	 * @method execCommand
	 * @param {String} cmd Command to execute.
	 * @param {Boolean} ui Optional boolean value if the UI for the command should be presented or not.
	 * @param {Object} val Optional value to pass with the comman like an URL.
	 * @param {Object} a Optional arguments object.
	 */
	execCommand : function(cmd, ui, val, args) {
		args = args || {};
		args.skip_focus = 1;

this.restoreSelection();
		return this.editor.execCommand(cmd, ui, val, args);
	},

/**
	 * Resizes the dialog to the inner size of the window. This is needed since various browsers
	 * have different border sizes on windows.
	 *
	 * @method resizeToInnerSize
	 */
	resizeToInnerSize : function() {
		/*var self = this;

// Detach it to workaround a Chrome specific bug
		// https://sourceforge.net/tracker/?func=detail&atid=635682&aid=2926339&group_id=103281
		setTimeout(function() {
			var vp = self.dom.getViewPort(window);

self.editor.windowManager.resizeBy(
				self.getWindowArg('mce_width') - vp.w,
				self.getWindowArg('mce_height') - vp.h,
				self.id || window
			);
		}, 10);*/
	},

/**
	 * Will executed the specified string when the page has been loaded. This function
	 * was added for compatibility with the 2.x branch.
	 *
	 * @method executeOnLoad
	 * @param {String} evil String to evalutate on init.
	 */
	executeOnLoad : function(evil) {
		this.onInit.add(function() {
			eval(evil);
		});
	},

/**
	 * Stores the current editor selection for later restoration. This can be useful since some browsers
	 * looses it's selection if a control element is selected/focused inside the dialogs.
	 *
	 * @method storeSelection
	 */
	storeSelection : function() {
		this.editor.windowManager.bookmark = tinyMCEPopup.editor.selection.getBookmark(1);
	},

/**
	 * Restores any stored selection. This can be useful since some browsers
	 * looses it's selection if a control element is selected/focused inside the dialogs.
	 *
	 * @method restoreSelection
	 */
	restoreSelection : function() {
		var self = tinyMCEPopup;

if (!self.isWindow && tinymce.isIE) {
			self.editor.selection.moveToBookmark(self.editor.windowManager.bookmark);
		}
	},

/**
	 * Loads a specific dialog language pack. If you pass in plugin_url as a argument
	 * when you open the window it will load the <plugin url>/langs/<code>_dlg.js lang pack file.
	 *
	 * @method requireLangPack
	 */
	requireLangPack : function() {
		var self = this, url = self.getWindowArg('plugin_url') || self.getWindowArg('theme_url'), settings = self.editor.settings, lang;

if (settings.language !== false) {
			lang = settings.language || "en";
		}

if (url && lang && self.features.translate_i18n !== false && settings.language_load !== false) {
			url += '/langs/' + lang + '_dlg.js';

if (!tinymce.ScriptLoader.isDone(url)) {
				document.write('<script type="text/javascript" src="' + url + '"></script>');
				tinymce.ScriptLoader.markDone(url);
			}
		}
	},

/**
	 * Executes a color picker on the specified element id. When the user
	 * then selects a color it will be set as the value of the specified element.
	 *
	 * @method pickColor
	 * @param {DOMEvent} e DOM event object.
	 * @param {string} element_id Element id to be filled with the color value from the picker.
	 */
	pickColor : function(e, element_id) {
		var el = document.getElementById(element_id), colorPickerCallback = this.editor.settings.color_picker_callback;
		if (colorPickerCallback) {
			colorPickerCallback.call(
				this.editor,
				function (value) {
					el.value = value;
					try {
						el.onchange();
					} catch (ex) {
						// Try fire event, ignore errors
					}
				},
				el.value
			);
		}
	},

/**
	 * Opens a filebrowser/imagebrowser this will set the output value from
	 * the browser as a value on the specified element.
	 *
	 * @method openBrowser
	 * @param {string} element_id Id of the element to set value in.
	 * @param {string} type Type of browser to open image/file/flash.
	 * @param {string} option Option name to get the file_broswer_callback function name from.
	 */
	openBrowser : function(element_id, type) {
		tinyMCEPopup.restoreSelection();
		this.editor.execCallback('file_browser_callback', element_id, document.getElementById(element_id).value, type, window);
	},

/**
	 * Creates a confirm dialog. Please don't use the blocking behavior of this
	 * native version use the callback method instead then it can be extended.
	 *
	 * @method confirm
	 * @param {String} t Title for the new confirm dialog.
	 * @param {function} cb Callback function to be executed after the user has selected ok or cancel.
	 * @param {Object} s Optional scope to execute the callback in.
	 */
	confirm : function(t, cb, s) {
		this.editor.windowManager.confirm(t, cb, s, window);
	},

/**
	 * Creates a alert dialog. Please don't use the blocking behavior of this
	 * native version use the callback method instead then it can be extended.
	 *
	 * @method alert
	 * @param {String} tx Title for the new alert dialog.
	 * @param {function} cb Callback function to be executed after the user has selected ok.
	 * @param {Object} s Optional scope to execute the callback in.
	 */
	alert : function(tx, cb, s) {
		this.editor.windowManager.alert(tx, cb, s, window);
	},

/**
	 * Closes the current window.
	 *
	 * @method close
	 */
	close : function() {
		var t = this;

// To avoid domain relaxing issue in Opera
		function close() {
			t.editor.windowManager.close(window);
			tinymce = tinyMCE = t.editor = t.params = t.dom = t.dom.doc = null; // Cleanup
		}

if (tinymce.isOpera) {
			t.getWin().setTimeout(close, 0);
		} else {
			close();
		}
	},

// Internal functions

_restoreSelection : function() {
		var e = window.event.srcElement;

if (e.nodeName == 'INPUT' && (e.type == 'submit' || e.type == 'button')) {
			tinyMCEPopup.restoreSelection();
		}
	},

/*	_restoreSelection : function() {
		var e = window.event.srcElement;

// If user focus a non text input or textarea
		if ((e.nodeName != 'INPUT' && e.nodeName != 'TEXTAREA') || e.type != 'text')
			tinyMCEPopup.restoreSelection();
	},*/

_onDOMLoaded : function() {
		var t = tinyMCEPopup, ti = document.title, h, nv;

// Translate page
		if (t.features.translate_i18n !== false) {
			var map = {
				"update": "Ok",
				"insert": "Ok",
				"cancel": "Cancel",
				"not_set": "--",
				"class_name": "Class name",
				"browse": "Browse"
			};

var langCode = (tinymce.settings ? tinymce.settings : t.editor.settings).language || 'en';
			for (var key in map) {
				tinymce.i18n.data[langCode + "." + key] = tinymce.i18n.translate(map[key]);
			}

h = document.body.innerHTML;

// Replace a=x with a="x" in IE
			if (tinymce.isIE) {
				h = h.replace(/ (value|title|alt)=([^"][^\s>]+)/gi, ' $1="$2"');
			}

document.dir = t.editor.getParam('directionality','');

if ((nv = t.editor.translate(h)) && nv != h) {
				document.body.innerHTML = nv;
			}

if ((nv = t.editor.translate(ti)) && nv != ti) {
				document.title = ti = nv;
			}
		}

if (!t.editor.getParam('browser_preferred_colors', false) || !t.isWindow) {
			t.dom.addClass(document.body, 'forceColors');
		}

document.body.style.display = '';

// Restore selection in IE when focus is placed on a non textarea or input element of the type text
		if (tinymce.Env.ie) {
			if (tinymce.Env.ie < 11) {
				document.attachEvent('onmouseup', tinyMCEPopup._restoreSelection);

// Add base target element for it since it would fail with modal dialogs
				t.dom.add(t.dom.select('head')[0], 'base', {target: '_self'});
			} else {
				document.addEventListener('mouseup', tinyMCEPopup._restoreSelection, false);
			}
		}

t.restoreSelection();
		t.resizeToInnerSize();

// Set inline title
		if (!t.isWindow) {
			t.editor.windowManager.setTitle(window, ti);
		} else {
			window.focus();
		}

if (!tinymce.isIE && !t.isWindow) {
			t.dom.bind(document, 'focus', function() {
				t.editor.windowManager.focus(t.id);
			});
		}

// Patch for accessibility
		tinymce.each(t.dom.select('select'), function(e) {
			e.onkeydown = tinyMCEPopup._accessHandler;
		});

// Call onInit
		// Init must be called before focus so the selection won't get lost by the focus call
		tinymce.each(t.listeners, function(o) {
			o.func.call(o.scope, t.editor);
		});

// Move focus to window
		if (t.getWindowArg('mce_auto_focus', true)) {
			window.focus();

// Focus element with mceFocus class
			tinymce.each(document.forms, function(f) {
				tinymce.each(f.elements, function(e) {
					if (t.dom.hasClass(e, 'mceFocus') && !e.disabled) {
						e.focus();
						return false; // Break loop
					}
				});
			});
		}

document.onkeyup = tinyMCEPopup._closeWinKeyHandler;

if ('textContent' in document) {
			t.uiWindow.getEl('head').firstChild.textContent = document.title;
		} else {
			t.uiWindow.getEl('head').firstChild.innerText = document.title;
		}
	},

_accessHandler : function(e) {
		e = e || window.event;

if (e.keyCode == 13 || e.keyCode == 32) {
			var elm = e.target || e.srcElement;

if (elm.onchange) {
				elm.onchange();
			}

return tinymce.dom.Event.cancel(e);
		}
	},

_closeWinKeyHandler : function(e) {
		e = e || window.event;

if (e.keyCode == 27) {
			tinyMCEPopup.close();
		}
	},

_eventProxy: function(id) {
		return function(evt) {
			tinyMCEPopup.dom.events.callNativeHandler(id, evt);
		};
	}
};

tinyMCEPopup.init();

tinymce.util.Dispatcher = function(scope) {
	this.scope = scope || this;
	this.listeners = [];

this.add = function(callback, scope) {
		this.listeners.push({cb : callback, scope : scope || this.scope});

return callback;
	};

this.addToTop = function(callback, scope) {
		var self = this, listener = {cb : callback, scope : scope || self.scope};

// Create new listeners if addToTop is executed in a dispatch loop
		if (self.inDispatch) {
			self.listeners = [listener].concat(self.listeners);
		} else {
			self.listeners.unshift(listener);
		}

return callback;
	};

this.remove = function(callback) {
		var listeners = this.listeners, output = null;

tinymce.each(listeners, function(listener, i) {
			if (callback == listener.cb) {
				output = listener;
				listeners.splice(i, 1);
				return false;
			}
		});

return output;
	};

this.dispatch = function() {
		var self = this, returnValue, args = arguments, i, listeners = self.listeners, listener;

self.inDispatch = true;

// Needs to be a real loop since the listener count might change while looping
		// And this is also more efficient
		for (i = 0; i < listeners.length; i++) {
			listener = listeners[i];
			returnValue = listener.cb.apply(listener.scope, args.length > 0 ? args : [listener.scope]);

if (returnValue === false) {
				break;
			}
		}

self.inDispatch = false;

return returnValue;
	};
};

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EDIT :: tiny_mce_popup.js