Question

I want to bind in actionscript a boolean with a condition. This is possible in mxml but how can this be done on actionscript?

Example:

.mxml binding:

enabled={(A_changed || B_changed  || C_changed || D_changed) && rs.selectedIndex !=-1}/>

.as binding:

BindingUtils.bindProperty(this.myBtn,'enabled',????);

Thanks,
Dave

Answer 1

There is no lazy solution to your issue – the Flex compiler is doing a lot of transformations in the MXML bindings, which aren’t available in vanilla AS3. You’ll have to attach BindingUtils.bindSetter to all of the properties. Something like:

var closure:Function = function(...triggers):void {
     enabled = (A_changed || B_changed || C_changed || D_changed) && rs.selectedIndex !=-1;
}
BindingUtils.bindSetter(closure, this, "A_changed");
BindingUtils.bindSetter(closure, this, "B_changed");
BindingUtils.bindSetter(closure, this, "C_changed");
BindingUtils.bindSetter(closure, this, "D_changed");
BindingUtils.bindSetter(closure, rs, "selectedIndex");