Employee = Ext.extend(Ext.util.Observable, {
constructor: function(config){
this.name = config.name;
this.addEvents({
"fired" : true,
"quit" : true
});
// Copy configured listeners into *this* object so that the base class's
// constructor will add them.
this.listeners = config.listeners;
// Call our superclass constructor to complete construction process.
Employee.superclass.constructor.call(config)
}
});
var newEmployee = new Employee({
name: employeeName,
listeners: {
quit: function() {
// By default, "this" will be the object that fired the event.
alert(this.name + " has quit!");
}
}
});
A config object containing one or more event handlers to be added to this * object during initialization. This should be a valid listeners config object as specified in the * {@link #addListener} example for attaching multiple handlers at once.
*DOM events from ExtJs {@link Ext.Component Components}
*While some ExtJs Component classes export selected DOM events (e.g. "click", "mouseover" etc), this
* is usually only done when extra value can be added. For example the {@link Ext.DataView DataView}'s
* {@link Ext.DataView#click click} event passing the node clicked on. To access DOM
* events directly from a Component's HTMLElement, listeners must be added to the {@link Ext.Component#getEl Element} after the Component
* has been rendered. A plugin can simplify this step:
// Plugin is configured with a listeners config object.
// The Component is appended to the argument list of all handler functions.
Ext.DomObserver = Ext.extend(Object, {
constructor: function(config) {
this.listeners = config.listeners ? config.listeners : config;
},
// Component passes itself into plugin's init method
init: function(c) {
var p, l = this.listeners;
for (p in l) {
if (Ext.isFunction(l[p])) {
l[p] = this.createHandler(l[p], c);
} else {
l[p].fn = this.createHandler(l[p].fn, c);
}
}
// Add the listeners to the Element immediately following the render call
c.render = c.render.{@link Function#createSequence createSequence}(function() {
var e = c.getEl();
if (e) {
e.on(l);
}
});
},
createHandler: function(fn, c) {
return function(e) {
fn.call(this, e, c);
};
}
});
var combo = new Ext.form.ComboBox({
// Collapse combo when its element is clicked on
plugins: [ new Ext.DomObserver({
click: function(evt, comp) {
comp.collapse();
}
})],
store: myStore,
typeAhead: true,
mode: 'local',
triggerAction: 'all'
});
* Fires the specified event with the passed parameters (minus the event name).
*An event may be set to bubble up an Observable parent hierarchy (See {@link Ext.Component#getBubbleTarget}) * by calling {@link #enableBubble}.
* @param {String} eventName The name of the event to fire. * @param {Object...} args Variable number of parameters are passed to handlers. * @return {Boolean} returns false if any of the handlers return false otherwise it returns true. */ fireEvent : function(){ var a = TOARRAY(arguments), ename = toLower(a[0]), me = this, ret = TRUE, ce = me.events[ename], q, c; if (me.eventsSuspended === TRUE) { if (q = me.suspendedEventsQueue) { q.push(a); } } else if(ISOBJECT(ce) && ce.bubble){ if(ce.fire.apply(ce, a.slice(1)) === FALSE) { return FALSE; } c = me.getBubbleTarget && me.getBubbleTarget(); if(c && c.enableBubble) { c.enableBubble(ename); return c.fireEvent.apply(c, a); } } else { if (ISOBJECT(ce)) { a.shift(); ret = ce.fire.apply(ce, a); } } return ret; }, /** * Appends an event handler to this object. * @param {String} eventName The name of the event to listen for. * @param {Function} handler The method the event invokes. * @param {Object} scope (optional) The scope (this reference) in which the handler function is executed.
* If omitted, defaults to the object which fired the event.
* @param {Object} options (optional) An object containing handler configuration.
* properties. This may contain any of the following properties:this reference) in which the handler function is executed.
* If omitted, defaults to the object which fired the event.
* Combining Options
* Using the options argument, it is possible to combine different types of listeners:
*
* A delayed, one-time listener.
*
myDataView.on('click', this.onClick, this, {
single: true,
delay: 100
});
* Attaching multiple handlers in 1 call
* The method also allows for a single argument to be passed which is a config object containing properties
* which specify multiple handlers.
*
*
myGridPanel.on({
'click' : {
fn: this.onClick,
scope: this,
delay: 100
},
'mouseover' : {
fn: this.onMouseOver,
scope: this
},
'mouseout' : {
fn: this.onMouseOut,
scope: this
}
});
* Or a shorthand syntax:
*
myGridPanel.on({
'click' : this.onClick,
'mouseover' : this.onMouseOver,
'mouseout' : this.onMouseOut,
scope: this
});this reference) in which the handler function is executed.
* If omitted, defaults to the object which fired the event.
* @param {Object} options (optional) An object containing handler configuration.
* @method
*/
OBSERVABLE.on = OBSERVABLE.addListener;
/**
* Removes an event handler (shorthand for {@link #removeListener}.)
* @param {String} eventName The type of event the handler was associated with.
* @param {Function} handler The handler to remove. This must be a reference to the function passed into the {@link #addListener} call.
* @param {Object} scope (optional) The scope originally specified for the handler.
* @method
*/
OBSERVABLE.un = OBSERVABLE.removeListener;
/**
* Removes all added captures from the Observable.
* @param {Observable} o The Observable to release
* @static
*/
EXTUTIL.Observable.releaseCapture = function(o){
o.fireEvent = OBSERVABLE.fireEvent;
};
function createTargeted(h, o, scope){
return function(){
if(o.target == arguments[0]){
h.apply(scope, TOARRAY(arguments));
}
};
};
function createBuffered(h, o, scope){
var task = new EXTUTIL.DelayedTask();
return function(){
task.delay(o.buffer, h, scope, TOARRAY(arguments));
};
}
function createSingle(h, e, fn, scope){
return function(){
e.removeListener(fn, scope);
return h.apply(scope, arguments);
};
}
function createDelayed(h, o, scope){
return function(){
var args = TOARRAY(arguments);
(function(){
h.apply(scope, args);
}).defer(o.delay || 10);
};
};
EXTUTIL.Event = function(obj, name){
this.name = name;
this.obj = obj;
this.listeners = [];
};
EXTUTIL.Event.prototype = {
addListener : function(fn, scope, options){
var me = this,
l;
scope = scope || me.obj;
if(!me.isListening(fn, scope)){
l = 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(l);
}
},
createListener: function(fn, scope, o){
o = o || {}, scope = scope || this.obj;
var l = {
fn: fn,
scope: scope,
options: o
}, h = fn;
if(o.target){
h = createTargeted(h, o, scope);
}
if(o.delay){
h = createDelayed(h, o, scope);
}
if(o.single){
h = createSingle(h, this, fn, scope);
}
if(o.buffer){
h = createBuffered(h, o, scope);
}
l.fireFn = h;
return l;
},
findListener : function(fn, scope){
var s, ret = -1;
EACH(this.listeners, function(l, i) {
s = l.scope;
if(l.fn == fn && (s == scope || s == this.obj)){
ret = i;
return FALSE;
}
},
this);
return ret;
},
isListening : function(fn, scope){
return this.findListener(fn, scope) != -1;
},
removeListener : function(fn, scope){
var index,
me = this,
ret = FALSE;
if((index = me.findListener(fn, scope)) != -1){
if (me.firing) {
me.listeners = me.listeners.slice(0);
}
me.listeners.splice(index, 1);
ret = TRUE;
}
return ret;
},
clearListeners : function(){
this.listeners = [];
},
fire : function(){
var me = this,
args = TOARRAY(arguments),
ret = TRUE;
EACH(me.listeners, function(l) {
me.firing = TRUE;
if (l.fireFn.apply(l.scope || me.obj || window, args) === FALSE) {
return ret = me.firing = FALSE;
}
});
me.firing = FALSE;
return ret;
}
};
})();