On Sat, Feb 7, 2009 at 10:57 AM, Red15 <[email protected]> wrote:
>
>
>
> On Feb 6, 11:21 pm, Alex Holkner <[email protected]> wrote:
>> On Sat, Feb 7, 2009 at 8:04 AM, Red15 <[email protected]> wrote:
>>
>> > Well not really, suppose this :
>>
>> > I have subclassed pyglet.window.Window and am acting on my on_draw
>> > event.
>>
>> > Inside the window.on_draw I put a window.clear(), since this is the
>> > first handler it will be called last so in effect clearing everything
>> > I have just drawn...
>> > Right now i solve it by making the window.on_draw dispatch another
>> > event right after clearing the window and I called it "draw" instead
>> > of "on_draw".
>>
>> > I guess there are other better ways to solve, if so I would like to
>> > hear them, but to me a (relatively) simple solution would be to allow
>> > inserting push_handlers at a certain index position maybe ?
>>
>> It's a fair point that on_draw isn't useful with stacking -- it should
>> have been a special case that calls in reverse order. It may be
>> changed, in some future unplanned backward-incompatible version. In
>> the meantime, you can't really use the event stack for your drawing --
>> I typically maintain a separate stack of draw handlers in the
>> application and call them myself.
>>
>> Alex.
>
> Can you give a short style example of what you mean by a separate
> stack of draw handlers and how you maintain them ?
window.draw_handlers = []
Then, each time you window.push_handlers, also:
window.push_handlers(responder)
window.draw_handlers.append(responder.draw)
(Similarly for pop_handlers). In Window.on_draw:
for func in self.draw_handlers:
func()
>
> And what would be the downside of my custom draw event (besides a dose
> of possible confusion) ?
Because events are called top-down, and draw calls need to be made
bottom up -- this can only be solved by changing the event mechanism.
> Are events a lot more intensive then calling functions one by one from
> a list ?
I doubt it, that's pretty much what events do anyway.
Alex.
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