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minimize triggerEvent code path when no listeners, r=tschaub (closes #2014)

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git-svn-id: http://svn.openlayers.org/trunk/openlayers@9142 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
This commit is contained in:
Éric Lemoine
2009-03-28 16:17:54 +00:00
parent 8bac39243f
commit cf5aa98cce
1 changed files with 19 additions and 17 deletions
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36
lib/OpenLayers/Events.js
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@@ -693,6 +693,12 @@ OpenLayers.Events = OpenLayers.Class({
* chain of listeners will stop getting called.
*/
triggerEvent: function (type, evt) {
var listeners = this.listeners[type];
// fast path
if(!listeners || listeners.length == 0) {
return;
}
// prep evt object with object & div references
if (evt == null) {
@@ -707,25 +713,21 @@ OpenLayers.Events = OpenLayers.Class({
// execute all callbacks registered for specified type
// get a clone of the listeners array to
// allow for splicing during callbacks
var listeners = (this.listeners[type]) ?
this.listeners[type].slice() : null;
if ((listeners != null) && (listeners.length > 0)) {
var continueChain;
for (var i=0, len=listeners.length; i<len; i++) {
var callback = listeners[i];
// bind the context to callback.obj
continueChain = callback.func.apply(callback.obj, [evt]);
if ((continueChain != undefined) && (continueChain == false)) {
// if callback returns false, execute no more callbacks.
break;
}
}
// don't fall through to other DOM elements
if (!this.fallThrough) {
OpenLayers.Event.stop(evt, true);
var listeners = listeners.slice(), continueChain;
for (var i=0, len=listeners.length; i<len; i++) {
var callback = listeners[i];
// bind the context to callback.obj
continueChain = callback.func.apply(callback.obj, [evt]);
if ((continueChain != undefined) && (continueChain == false)) {
// if callback returns false, execute no more callbacks.
break;
}
}
// don't fall through to other DOM elements
if (!this.fallThrough) {
OpenLayers.Event.stop(evt, true);
}
return continueChain;
},