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<pre class="prettyprint lang-js">Ext.require('Ext.util.DelayedTask', function() {
<span id='Ext-util-Event'> /**
</span> * Represents single event type that an Observable object listens to.
* All actual listeners are tracked inside here. When the event fires,
* it calls all the registered listener functions.
*
* @private
*/
Ext.util.Event = Ext.extend(Object, (function() {
var noOptions = {};
function createTargeted(handler, listener, o, scope){
return function(){
if (o.target === arguments[0]){
handler.apply(scope, arguments);
}
};
}
function createBuffered(handler, listener, o, scope) {
listener.task = new Ext.util.DelayedTask();
return function() {
listener.task.delay(o.buffer, handler, scope, Ext.Array.toArray(arguments));
};
}
function createDelayed(handler, listener, o, scope) {
return function() {
var task = new Ext.util.DelayedTask();
if (!listener.tasks) {
listener.tasks = [];
}
listener.tasks.push(task);
task.delay(o.delay || 10, handler, scope, Ext.Array.toArray(arguments));
};
}
function createSingle(handler, listener, o, scope) {
return function() {
var event = listener.ev;
if (event.removeListener(listener.fn, scope) && event.observable) {
// Removing from a regular Observable-owned, named event (not an anonymous
// event such as Ext's readyEvent): Decrement the listeners count
event.observable.hasListeners[event.name]--;
}
return handler.apply(scope, arguments);
};
}
return {
<span id='Ext-util-Event-property-isEvent'> /**
</span> * @property {Boolean} isEvent
* `true` in this class to identify an object as an instantiated Event, or subclass thereof.
*/
isEvent: true,
constructor: function(observable, name) {
this.name = name;
this.observable = observable;
this.listeners = [];
},
addListener: function(fn, scope, options) {
var me = this,
listener;
scope = scope || me.observable;
//<debug error>
if (!fn) {
Ext.Error.raise({
sourceClass: Ext.getClassName(this.observable),
sourceMethod: "addListener",
msg: "The specified callback function is undefined"
});
}
//</debug>
if (!me.isListening(fn, scope)) {
listener = me.createListener(fn, scope, options);
if (me.firing) {
// if we are currently firing this event, don't disturb the listener loop
me.listeners = me.listeners.slice(0);
}
me.listeners.push(listener);
}
},
createListener: function(fn, scope, options) {
options = options || noOptions;
scope = scope || this.observable;
var listener = {
fn: fn,
scope: scope,
o: options,
ev: this
},
handler = fn;
// The order is important. The 'single' wrapper must be wrapped by the 'buffer' and 'delayed' wrapper
// because the event removal that the single listener does destroys the listener's DelayedTask(s)
if (options.single) {
handler = createSingle(handler, listener, options, scope);
}
if (options.target) {
handler = createTargeted(handler, listener, options, scope);
}
if (options.delay) {
handler = createDelayed(handler, listener, options, scope);
}
if (options.buffer) {
handler = createBuffered(handler, listener, options, scope);
}
listener.fireFn = handler;
return listener;
},
findListener: function(fn, scope) {
var listeners = this.listeners,
i = listeners.length,
listener,
s;
while (i--) {
listener = listeners[i];
if (listener) {
s = listener.scope;
// Compare the listener's scope with *JUST THE PASSED SCOPE* if one is passed, and only fall back to the owning Observable if none is passed.
// We cannot use the test (s == scope || s == this.observable)
// Otherwise, if the Observable itself adds Ext.emptyFn as a listener, and then Ext.emptyFn is added under another scope, there will be a false match.
if (listener.fn == fn && (s == (scope || this.observable))) {
return i;
}
}
}
return - 1;
},
isListening: function(fn, scope) {
return this.findListener(fn, scope) !== -1;
},
removeListener: function(fn, scope) {
var me = this,
index,
listener,
k;
index = me.findListener(fn, scope);
if (index != -1) {
listener = me.listeners[index];
if (me.firing) {
me.listeners = me.listeners.slice(0);
}
// cancel and remove a buffered handler that hasn't fired yet
if (listener.task) {
listener.task.cancel();
delete listener.task;
}
// cancel and remove all delayed handlers that haven't fired yet
k = listener.tasks && listener.tasks.length;
if (k) {
while (k--) {
listener.tasks[k].cancel();
}
delete listener.tasks;
}
// remove this listener from the listeners array
Ext.Array.erase(me.listeners, index, 1);
return true;
}
return false;
},
// Iterate to stop any buffered/delayed events
clearListeners: function() {
var listeners = this.listeners,
i = listeners.length;
while (i--) {
this.removeListener(listeners[i].fn, listeners[i].scope);
}
},
fire: function() {
var me = this,
listeners = me.listeners,
count = listeners.length,
i,
args,
listener;
if (count > 0) {
me.firing = true;
for (i = 0; i < count; i++) {
listener = listeners[i];
args = arguments.length ? Array.prototype.slice.call(arguments, 0) : [];
if (listener.o) {
args.push(listener.o);
}
if (listener && listener.fireFn.apply(listener.scope || me.observable, args) === false) {
return (me.firing = false);
}
}
}
me.firing = false;
return true;
}
};
}()));
});
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