[wxruby-users] No joy from Wx::App.dispatch, Wx::App.yield...

[Mario Steele]

Hello Jay,

To process an exit event, or rather a close event, utilize evt_close event
handler.  Also, what errors are you getting with 1.9.3/4?

On 1/19/08, Jay McGavren <jay at mcgavren.com> wrote:
>
> OK, back with another iteration of the same problem...  I updated my
> game demo, but the Close button failed to respond when (and only when)
> there were too many objects onscreen.  The drawing loop is probably
> lasting longer than my drawing timer interval.  I was able to
> reproduce the problem in my (probably familiar by now) test script
> just by boosting the number of lines drawn per frame.
>
> After each frame, I tried Wx::App.dispatch, Wx::App.dispatch while
> Wx::App.pending, and Wx::App.yield, all without effect.  The
> (commented out) statements are in the code below.
>
> I'm running Ruby 1.8.6 on Windows with wxRuby 1.9.2 (1.9.3 and 1.9.4
> both give me errors).
>
> If wxRuby is busy drawing when the close button is clicked, is the
> window close event getting lost altogether, or merely going unhandled?
> If it's just going unhandled, how can I find it and process it?  Help
> is, as always, most appreciated!
>
> -Jay McGavren
> http://jay.mcgavren.com/zyps
>
>
>   require 'rubygems'
>   require 'wx'
>
>   class MyApp < Wx::App
>
>     def on_init
>
>       #Containing frame.
>       frame = Wx::Frame.new(nil, :size => [300, 300])
>       frame.show
>
>       #Offscreen drawing buffer.
>       buffer = Wx::Bitmap.new(300, 300)
>
>       #Displays drawing.
>       window = Wx::Window.new(frame, :size => [300, 300])
>       window.evt_paint do |event|
>         update_window(window, buffer)
>       end
>
>       #Initialize drawing loop counter.
>       @i = 0
>
>       #Animate periodically.
>       timer_id = Wx::ID_HIGHEST + 1
>       t = Wx::Timer.new(self, timer_id)
>       evt_timer(timer_id) do
>         animate(window, buffer)
>         #No effect.
>         #self.dispatch
>         #No effect.
>         #self.dispatch while self.pending
>         #No effect.
>         #self.yield
>       end
>       t.start(33)
>
>     end
>
>     def animate(window, buffer)
>       green_pen = Wx::Pen.new(Wx::Colour.new(128, 255, 128), 3)
>       black_pen = Wx::Pen.new(Wx::Colour.new(0, 0, 0), 0)
>       buffer.draw do |surface|
>         #Clear screen.
>         surface.pen = black_pen
>         surface.brush = Wx::BLACK_BRUSH
>         surface.draw_rectangle(0, 0, 300, 300)
>         #Draw lines.
>         surface.pen = green_pen
>         surface.pen.cap = Wx::CAP_ROUND
>         30000.times do |j|
>           x = @i + j
>           surface.draw_line(x, 0, x+100, 100)
>         end
>       end
>       #Update screen.
>       update_window(window, buffer)
>       @i += 1
>       @i = 0 if @i > 300
>     end
>
>     def update_window(window, buffer)
>       window.paint do |dc|
>         #Copy the buffer to the viewable window.
>         dc.draw_bitmap(buffer, 0, 0, false)
>       end
>     end
>
>   end
>
>   app = MyApp.new
>   app.main_loop
> _______________________________________________
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>



-- 
Mario Steele
http://www.trilake.net
http://www.ruby-im.net
http://rubyforge.org/projects/wxruby/
http://rubyforge.org/projects/wxride/
http://rubyforge.org/projects/vwmc/
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