3 * Copyright(c) 2006-2009 Ext JS, LLC
5 * http://www.extjs.com/license
9 var EXTUTIL = Ext.util,
10 TOARRAY = Ext.toArray,
12 ISOBJECT = Ext.isObject,
16 * @class Ext.util.Observable
17 * Base class that provides a common interface for publishing events. Subclasses are expected to
18 * to have a property "events" with all the events defined, and, optionally, a property "listeners"
19 * with configured listeners defined.<br>
22 Employee = Ext.extend(Ext.util.Observable, {
23 constructor: function(config){
24 this.name = config.name;
30 // Copy configured listeners into *this* object so that the base class's
31 // constructor will add them.
32 this.listeners = config.listeners;
34 // Call our superclass constructor to complete construction process.
35 Employee.superclass.constructor.call(config)
39 * This could then be used like this:<pre><code>
40 var newEmployee = new Employee({
44 // By default, "this" will be the object that fired the event.
45 alert(this.name + " has quit!");
51 EXTUTIL.Observable = function(){
53 * @cfg {Object} listeners (optional) <p>A config object containing one or more event handlers to be added to this
54 * object during initialization. This should be a valid listeners config object as specified in the
55 * {@link #addListener} example for attaching multiple handlers at once.</p>
56 * <br><p><b><u>DOM events from ExtJs {@link Ext.Component Components}</u></b></p>
57 * <br><p>While <i>some</i> ExtJs Component classes export selected DOM events (e.g. "click", "mouseover" etc), this
58 * is usually only done when extra value can be added. For example the {@link Ext.DataView DataView}'s
59 * <b><code>{@link Ext.DataView#click click}</code></b> event passing the node clicked on. To access DOM
60 * events directly from a Component's HTMLElement, listeners must be added to the <i>{@link Ext.Component#getEl Element}</i> after the Component
61 * has been rendered. A plugin can simplify this step:<pre><code>
62 // Plugin is configured with a listeners config object.
63 // The Component is appended to the argument list of all handler functions.
64 Ext.DomObserver = Ext.extend(Object, {
65 constructor: function(config) {
66 this.listeners = config.listeners ? config.listeners : config;
69 // Component passes itself into plugin's init method
71 var p, l = this.listeners;
73 if (Ext.isFunction(l[p])) {
74 l[p] = this.createHandler(l[p], c);
76 l[p].fn = this.createHandler(l[p].fn, c);
80 // Add the listeners to the Element immediately following the render call
81 c.render = c.render.{@link Function#createSequence createSequence}(function() {
89 createHandler: function(fn, c) {
96 var combo = new Ext.form.ComboBox({
98 // Collapse combo when its element is clicked on
99 plugins: [ new Ext.DomObserver({
100 click: function(evt, comp) {
111 var me = this, e = me.events;
119 EXTUTIL.Observable.prototype = {
121 filterOptRe : /^(?:scope|delay|buffer|single)$/,
124 * <p>Fires the specified event with the passed parameters (minus the event name).</p>
125 * <p>An event may be set to bubble up an Observable parent hierarchy (See {@link Ext.Component#getBubbleTarget})
126 * by calling {@link #enableBubble}.</p>
127 * @param {String} eventName The name of the event to fire.
128 * @param {Object...} args Variable number of parameters are passed to handlers.
129 * @return {Boolean} returns false if any of the handlers return false otherwise it returns true.
131 fireEvent : function(){
132 var a = TOARRAY(arguments),
133 ename = a[0].toLowerCase(),
136 ce = me.events[ename],
139 if (me.eventsSuspended === TRUE) {
140 if (q = me.eventQueue) {
144 else if(ISOBJECT(ce) && ce.bubble){
145 if(ce.fire.apply(ce, a.slice(1)) === FALSE) {
148 c = me.getBubbleTarget && me.getBubbleTarget();
149 if(c && c.enableBubble) {
150 if(!c.events[ename] || !Ext.isObject(c.events[ename]) || !c.events[ename].bubble) {
151 c.enableBubble(ename);
153 return c.fireEvent.apply(c, a);
159 ret = ce.fire.apply(ce, a);
166 * Appends an event handler to this object.
167 * @param {String} eventName The name of the event to listen for.
168 * @param {Function} handler The method the event invokes.
169 * @param {Object} scope (optional) The scope (<code><b>this</b></code> reference) in which the handler function is executed.
170 * <b>If omitted, defaults to the object which fired the event.</b>
171 * @param {Object} options (optional) An object containing handler configuration.
172 * properties. This may contain any of the following properties:<ul>
173 * <li><b>scope</b> : Object<div class="sub-desc">The scope (<code><b>this</b></code> reference) in which the handler function is executed.
174 * <b>If omitted, defaults to the object which fired the event.</b></div></li>
175 * <li><b>delay</b> : Number<div class="sub-desc">The number of milliseconds to delay the invocation of the handler after the event fires.</div></li>
176 * <li><b>single</b> : Boolean<div class="sub-desc">True to add a handler to handle just the next firing of the event, and then remove itself.</div></li>
177 * <li><b>buffer</b> : Number<div class="sub-desc">Causes the handler to be scheduled to run in an {@link Ext.util.DelayedTask} delayed
178 * by the specified number of milliseconds. If the event fires again within that time, the original
179 * handler is <em>not</em> invoked, but the new handler is scheduled in its place.</div></li>
180 * <li><b>target</b> : Observable<div class="sub-desc">Only call the handler if the event was fired on the target Observable, <i>not</i>
181 * if the event was bubbled up from a child Observable.</div></li>
184 * <b>Combining Options</b><br>
185 * Using the options argument, it is possible to combine different types of listeners:<br>
187 * A delayed, one-time listener.
189 myDataView.on('click', this.onClick, this, {
194 * <b>Attaching multiple handlers in 1 call</b><br>
195 * The method also allows for a single argument to be passed which is a config object containing properties
196 * which specify multiple handlers.
206 fn: this.onMouseOver,
215 * Or a shorthand syntax:<br>
218 'click' : this.onClick,
219 'mouseover' : this.onMouseOver,
220 'mouseout' : this.onMouseOut,
224 addListener : function(eventName, fn, scope, o){
230 if (ISOBJECT(eventName)) {
234 if (!me.filterOptRe.test(e)) {
235 me.addListener(e, oe.fn || oe, oe.scope || o.scope, oe.fn ? oe : o);
239 eventName = eventName.toLowerCase();
240 ce = me.events[eventName] || TRUE;
241 if (Ext.isBoolean(ce)) {
242 me.events[eventName] = ce = new EXTUTIL.Event(me, eventName);
244 ce.addListener(fn, scope, ISOBJECT(o) ? o : {});
249 * Removes an event handler.
250 * @param {String} eventName The type of event the handler was associated with.
251 * @param {Function} handler The handler to remove. <b>This must be a reference to the function passed into the {@link #addListener} call.</b>
252 * @param {Object} scope (optional) The scope originally specified for the handler.
254 removeListener : function(eventName, fn, scope){
255 var ce = this.events[eventName.toLowerCase()];
257 ce.removeListener(fn, scope);
262 * Removes all listeners for this object
264 purgeListeners : function(){
265 var events = this.events,
271 evt.clearListeners();
277 * Adds the specified events to the list of events which this Observable may fire.
278 * @param {Object|String} o Either an object with event names as properties with a value of <code>true</code>
279 * or the first event name string if multiple event names are being passed as separate parameters.
280 * @param {string} Optional. Event name if multiple event names are being passed as separate parameters.
282 this.addEvents('storeloaded', 'storecleared');
285 addEvents : function(o){
287 me.events = me.events || {};
288 if (Ext.isString(o)) {
289 EACH(arguments, function(a) {
290 me.events[a] = me.events[a] || TRUE;
293 Ext.applyIf(me.events, o);
298 * Checks to see if this object has any listeners for a specified event
299 * @param {String} eventName The name of the event to check for
300 * @return {Boolean} True if the event is being listened for, else false
302 hasListener : function(eventName){
303 var e = this.events[eventName];
304 return ISOBJECT(e) && e.listeners.length > 0;
308 * Suspend the firing of all events. (see {@link #resumeEvents})
309 * @param {Boolean} queueSuspended Pass as true to queue up suspended events to be fired
310 * after the {@link #resumeEvents} call instead of discarding all suspended events;
312 suspendEvents : function(queueSuspended){
313 this.eventsSuspended = TRUE;
314 if(queueSuspended && !this.eventQueue){
315 this.eventQueue = [];
320 * Resume firing events. (see {@link #suspendEvents})
321 * If events were suspended using the <tt><b>queueSuspended</b></tt> parameter, then all
322 * events fired during event suspension will be sent to any listeners now.
324 resumeEvents : function(){
326 queued = me.eventQueue || [];
327 me.eventsSuspended = FALSE;
328 delete me.eventQueue;
329 EACH(queued, function(e) {
330 me.fireEvent.apply(me, e);
335 var OBSERVABLE = EXTUTIL.Observable.prototype;
337 * Appends an event handler to this object (shorthand for {@link #addListener}.)
338 * @param {String} eventName The type of event to listen for
339 * @param {Function} handler The method the event invokes
340 * @param {Object} scope (optional) The scope (<code><b>this</b></code> reference) in which the handler function is executed.
341 * <b>If omitted, defaults to the object which fired the event.</b>
342 * @param {Object} options (optional) An object containing handler configuration.
345 OBSERVABLE.on = OBSERVABLE.addListener;
347 * Removes an event handler (shorthand for {@link #removeListener}.)
348 * @param {String} eventName The type of event the handler was associated with.
349 * @param {Function} handler The handler to remove. <b>This must be a reference to the function passed into the {@link #addListener} call.</b>
350 * @param {Object} scope (optional) The scope originally specified for the handler.
353 OBSERVABLE.un = OBSERVABLE.removeListener;
356 * Removes <b>all</b> added captures from the Observable.
357 * @param {Observable} o The Observable to release
360 EXTUTIL.Observable.releaseCapture = function(o){
361 o.fireEvent = OBSERVABLE.fireEvent;
364 function createTargeted(h, o, scope){
366 if(o.target == arguments[0]){
367 h.apply(scope, TOARRAY(arguments));
372 function createBuffered(h, o, scope){
373 var task = new EXTUTIL.DelayedTask();
375 task.delay(o.buffer, h, scope, TOARRAY(arguments));
379 function createSingle(h, e, fn, scope){
381 e.removeListener(fn, scope);
382 return h.apply(scope, arguments);
386 function createDelayed(h, o, scope){
388 var args = TOARRAY(arguments);
390 h.apply(scope, args);
391 }).defer(o.delay || 10);
395 EXTUTIL.Event = function(obj, name){
401 EXTUTIL.Event.prototype = {
402 addListener : function(fn, scope, options){
405 scope = scope || me.obj;
406 if(!me.isListening(fn, scope)){
407 l = me.createListener(fn, scope, options);
408 if(me.firing){ // if we are currently firing this event, don't disturb the listener loop
409 me.listeners = me.listeners.slice(0);
411 me.listeners.push(l);
415 createListener: function(fn, scope, o){
416 o = o || {}, scope = scope || this.obj;
423 h = createTargeted(h, o, scope);
426 h = createDelayed(h, o, scope);
429 h = createSingle(h, this, fn, scope);
432 h = createBuffered(h, o, scope);
438 findListener : function(fn, scope){
440 EACH(this.listeners, function(l, i) {
442 if(l.fn == fn && (s == scope || s == this.obj)){
451 isListening : function(fn, scope){
452 return this.findListener(fn, scope) != -1;
455 removeListener : function(fn, scope){
459 if((index = me.findListener(fn, scope)) != -1){
461 me.listeners = me.listeners.slice(0);
463 me.listeners.splice(index, 1);
469 clearListeners : function(){
475 args = TOARRAY(arguments),
478 EACH(me.listeners, function(l) {
480 if (l.fireFn.apply(l.scope || me.obj || window, args) === FALSE) {
481 return ret = me.firing = FALSE;