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Only allow the installation of one onEventType handler at a time.

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For more, use #attach() / #detach()
This commit is contained in:
Jürg Lehni 2013-12-06 14:04:03 +01:00
parent 7e9989c6b9
commit 41fa3b24e7
1 changed files with 9 additions and 7 deletions
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16
src/core/Callback.js
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@ -84,13 +84,12 @@ var Callback = {
function callHandlers() { function callHandlers() {
for (var i in handlers) { for (var i in handlers) {
// When the handler function returns false, prevent the default // When the handler function returns false, prevent the default
// behaviour of the event by calling stop() on it. // behaviour and stop propagation of the event by calling stop()
if (handlers[i].apply(that, args) === false if (handlers[i].apply(that, args) === false
&& event && event.stop) && event && event.stop)
event.stop(); event.stop();
} }
} }
// See PaperScript.handleException for an explanation of the following. // See PaperScript.handleException for an explanation of the following.
// Firefox is to blame for the necessity of this... // Firefox is to blame for the necessity of this...
if (handleException) { if (handleException) {
@ -136,16 +135,19 @@ var Callback = {
types[type] = isString ? {} : entry; types[type] = isString ? {} : entry;
// Create getters and setters for the property // Create getters and setters for the property
// with the on*-name name: // with the on*-name name:
name = '_' + name; // Use '__' as there are some _onMouse* functions
// already, e.g.g on View.
name = '__' + name;
src['get' + part] = function() { src['get' + part] = function() {
return this[name]; return this[name];
}; };
src['set' + part] = function(func) { src['set' + part] = function(func) {
if (func) { // Detach the previous event, if there was one.
var prev = this[name];
if (prev)
this.detach(type, prev);
if (func)
this.attach(type, func); this.attach(type, func);
} else if (this[name]) {
this.detach(type, this[name]);
}
this[name] = func; this[name] = func;
}; };
}); });