If I use Fl_Double_Window as the top window, it will take the window several
seconds to response to keyboard input ('a' or ESC). If I replace the window
with Fl_Window, the program can exit at once when I press 'a' or ESC. Why is
Fl_Double_Window so slow?
Thanks.
1 #include <FL/Fl.H>
2 #include <FL/Fl_Widget.H>
3 #include <FL/Fl_Double_Window.H>
4 #include <FL/fl_draw.H>
5 #define DELAY 0.001
6 class Test_Draw: public Fl_Widget
7 {
8 public:
9 Test_Draw(int x, int y, int w, int h, char *l=0):Fl_Widget(x,y,w,h,l){
10 }
11 void draw(){
12 static double d=0;
13 d += 0.1;
14 fl_rectf(x(),y(), (int) d%w(), (int)d%h(), 255,255,255);
15 }
16 };
17 Test_Draw *t;
18 static void update(void *)
19 {
20 if(Fl::event_key('a')) exit(0);
21 t->redraw();
22 Fl::add_timeout(DELAY, update, 0);
23 }
24 int main(int argc, char **argv)
25 {
26 Fl_Double_Window w(200,200,Fl::w()/2, Fl::h()/2);
27 //Fl_Window w(200,200,Fl::w()/2, Fl::h()/2);
28 t = new Test_Draw(0,0,w.w(),w.h());
29 w.end();
30 w.show(argc, argv);
31 Fl::add_timeout(DELAY, update, 0);
32 Fl::run();
33 }
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