Perhaps it takes 2 iterations of the main loop for the vscale to update.
What happens if you try
while(gtk_events_pending()) gtk_main_iteration();
instead?
Ke Jin wrote:
> Dear All,
> I have a VScale in my interface and I created button named "Play" that
> once the button is clicked, the scale will move automatically.
>
> Below is the function connected to the button. And it performed strangely.
> The scale was not updated every iteration of the loop, which means the value
> of the scale changed from 0 to 2 then to 4 then 6....and jumped over
> 1,3,5...
>
> Does anyone have any idea why this happened?
>
> void playClick(GtkWidget *widget, VScale *slider)
> {
> double interval = 1;
> double currentTime = gtk_range_get_value((GtkRange*)(slider));
>
>
> while(currentTime<=20)
> {
> currentTime += interval;
> usleep(1000000);
> printf("current Time: %f\n",currentTime);
> gtk_range_set_value((GtkRange*)(gtkE->slider),currentTime);
> gtk_main_iteration();
> }
> }
>
> Many Thanks,
> Ke
>
> _______________________________________________
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>
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