In Xlib, How can I animate until an event occurs?
- by Animateur
Hi,
I've been trying to animate in a C program using Xlib and I wanna do something when an event occurs, otherwise I wanna keep animating. Here's an example code snippet of what I am doing currently:
while( 1 )
{
// If an event occurs, stop and do whatever is needed.
// If no event occurs, skip this if statement.
if ( XEventsQueued( display, QueuedAlready ) > 0 )
{
XNextEvent( display, &event )
switch ( event.type )
{
// Don't do anything
case Expose:
while ( event.xexpose.count != 0 )
break;
// Do something, when a button is pressed
case ButtonPress:
...
break;
// Do something, when a key is pressed
case KeyPress:
...
break;
}
}
animate(); // Do animation step i.e. change any drawings...
repaint(); // Paint again with the new changes from animation...
}
So basically, I wanna keep looping if the user hasn't clicked the mouse OR pressed a key in the keyboard yet. When the user presses a key OR clicks the mouse, I wanna stop and do a specific action. The problem in my above code is that, it doesnt stop whenever I do an action. If I remove the if statement, the animation blocks until an event occurs, however I do not want this. It's a simple problem, but I'm kinda new to Xlib/animations so any help would be highly appreciated. Thanks.
