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I want to refresh my screen every 200ms without having to add some code in a loop.

So, I would like to create a Timer with a callback in Vala using SDL.

I read the documentation but I don't understand what is excpected as a second parameter : http://www.valadoc.org/sdl/SDL.Timer.html

The following code compile without any error :

this.timer = new SDL.Timer( 200, () => { this.refresh(); return 0; } );

EDIT : here is the full code with SDL :

    public View( int width, int height, bool fullscreen, string window_name = "AKITA application" )
        {

            SDL.init( InitFlag.VIDEO | InitFlag.TIMER );

            this.last_tick = 0;
            this.fps = 25; // Set default value for FPS

            uint32 video_flags = SurfaceFlag.DOUBLEBUF | SurfaceFlag.HWACCEL | SurfaceFlag.HWSURFACE;

            this.screen = Screen.set_video_mode( width, height, 32, video_flags);

            if ( this.screen == null )
            {
                stderr.printf ("Could not set video mode.\n");
            }

            WindowManager.set_caption (window_name, "");

            this.timer = new SDL.Timer( 200, () => { this.refresh(); return 0; } );

        }

    public void refresh()
        {
            stdout.printf( "refresh...\n" );
        }

But nothing appears (refresh() should write something on stdout).

Could someone help me with this (or have a better way to do what I want) ?

Thanks,

Damien

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1 回答 1

5

您必须运行事件循环（例如带有SDL.Event.wait()or的循环SDL.Event.poll()），否则不会触发计时器。

于 2011-10-16T20:53:36.037 回答