Animation: onStart method

[John Smith]

As a result of a lack of events for things like onCycleStart, I sometimes use a Timeline in places where a Transition seems more appropriate, because in the Timeline you can add a KeyFrame at Duration zero that effectively gets you a handler for an on start event.

On May 10, 2013, at 12:28 AM, Martin Sladecek <martin.sladecek at oracle.com> wrote:

> Hi Sebastian,
> 
> This is currently not possible. There's a JIRA issue for more Animation/Transition events here: https://javafx-jira.kenai.com/browse/RT-14455, so don't forget to vote for it ;-).
> 
> Unfortunately, there's no reasonable workaround. One dirty fix might be wrapping such animation in a ParallelTransition, with a 0-length Timeline before it, putting the code in the it's onFinishedProperty.
> 
> Regards,
> -Martin
> 
> On 05/10/2013 09:09 AM, Sebastian Rheinnecker wrote:
>> Hello,
>> 
>> is there something like an onStart property in Animation, just like onFinished? Currently, if I want to do some stuff prior to executing a Transition, for example, I have to do something like
>> 
>> void playTranisition(){
>>  doStuff();
>>  doSomeOtherStuff();
>>  transition.play();
>> }
>> 
>> Where as
>> 
>> transition.onStartPropery().set(new EventHandler<ActionEvent>() {
>>      @Override
>>      public void handle(ActionEvent event) {
>>        doStuff();
>>        doSomeOtherStuff();
>>      }
>> });
>> 
>> would be far more convenient, since I could use this together with SequentialTransition and ParallelTransition and the like. Currently, I have to set a Handler on the onFinishedProperty of the preceding Transition (which blows up the code and leads to complicated adding and removing the listeners).
>> Or am I missing something here?
>> 
>> Kind regards,
>> 
>> Sebastian
>> 
>