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    Default MVC hasListeners optimization

    MVC hasListeners optimization


    I think the hasListeners optimization is not very helpful when using the MVC pattern.

    I'd like to fire a custom event only if there's a controller that listens to this event, but how do I know that there's such a controller? The hasListeners hash doesn't include controller listeners.

    Do you see this as a problem?

    Code:
    Ext.define('Ext.util.Observable', {
    
        constructor: function(config) {
            var me = this;
    
            Ext.apply(me, config);
    
            // Hash of event "hasListeners" flags.
            // For repeated events in time-critical code, the firing code should use
            // if (!me.hasListeners.beforerender || me.fireEvent('beforerender', me) !== false) { //code... }
            // Bubbling the events counts as one listener.
            // The subclass may have already initialized it.
            me.hasListeners = me.hasListeners || {};
            ....

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    Default


    Sencha Touch 2 I believe won't fire an event if there isn't a listener saving some performance. I had heard the Ext JS team talk about it but nothing has been implemented or promised.

    Back to your question. The global EventBus would have all the listeners from all controllers in it.
    Mitchell Simoens @SenchaMitch
    Sencha Inc, Senior Forum Manager
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    Quote Originally Posted by mitchellsimoens View Post
    Sencha Touch 2 I believe won't fire an event if there isn't a listener saving some performance. I had heard the Ext JS team talk about it but nothing has been implemented or promised.

    Back to your question. The global EventBus would have all the listeners from all controllers in it.
    Thanks for your answer. I have to say the MVC code is very well put together and it is easy to use. I did some Struts programming years ago... MVC on the client is more enjoyable.

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    In 4.1b3 there is a bug with MVC's EventBus and the hasListeners optimization. This has been fixed so that we can track listeners coming from controllers.
    Don Griffin
    Ext JS Development Team Lead

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    Quote Originally Posted by dongryphon View Post
    In 4.1b3 there is a bug with MVC's EventBus and the hasListeners optimization. This has been fixed so that we can track listeners coming from controllers.
    I believe I found another bug in the EventBus...

    Here's my ref fragment:

    Code:
        refs: [{
            ref: 'viewDisplay',
            selector: '#viewDisplay'
        },
    viewDisplay is a checkbox.

    I get this checkbox by calling getViewDisplay()...

    I suspend events on the checkbox by calling checkbox.suspendEvents()...

    ...then I call checkbox.setValue(value);

    The change event gets fired anyway even though I suspended events. Is this a bug?

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