Re: Catching errors in Mainloop.timeout_add, Clutter.threads_add_repaint_func, etc.

["Jasper St. Pierre" <jstpierre mecheye net>]

What errors are you having? Can you fix them? Imagine that all the
toons stopping is instant notification that an error came along.

On Tue, Jun 5, 2012 at 3:07 AM, Amy C <mathematical coffee gmail com> wrote:
> Hi all,
>
> I have an animation running like so (toons running around on the screen):
>    Clutter.threads_add_repaint_func(Lang.bind(this, this._frame)).
>
> My extension has a toggle for the animation; when switched to off it
> calls a function this.initiateStopSequence().
> this.initiateStopSequence() simply sets a 'terminate' flag on each
> toon, nothing else.
>
> The function this._frame sees this flag and tells every toon to start
> playing their "terminate" animation (imaging pressing "stop" and then
> every toon says "oh no!" and explodes).
>
> Only once every toon has finished terminating does this._frame call
> this.actuallyStop(), which in turn does
> Clutter.thread_remove_repaint_func to stop the animation.
>
> This is fine, *except* that if there is an error thrown in
> this._frame, all the toons freeze in their current position (because
> this._frame can't be run any more). However, toggling to 'off' will
> not remove all the toons from the screen, because it only calls
> this.initiateStopSequence() rather than this.actuallyStop().
> Then the user is stuck with all these toons on their screen that they
> can't remove.
>
> What I want is for this.initiateStopSequence() to be like so:
>
> if ( any error has been caught ) {
>   this.actuallyStop(); /* don't worry about the 'terminate'
> animations, just remove all the toons. */
> } else {
>   /* play terminate animations */
>   /* .. code to set 'terminate' flag */
> }
>
> But how can I catch any errors thrown by my extension in
> this.initiateStopSequence? It doesn't call this._frame so I can't
> really embed a try/catch in it.
>
> The only way I can think of is to embed a try/catch into this._frame,
> and on error call this.actuallyStop() from within this._frame.
> I'd like to know if there is another way, because it seems like I'm
> setting up the try/catch within the loop rather than outside the loop.
>
> cheers.
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-- 
  Jasper