# To subscribers of the xforms list from Antonio Buitrago <abuitrago@interlab.es> :
Praveen Thiagarajan escribió:
>
> This might be a little simple, but i am sort of stuck. I am using the
> glcanvas to draw some stuff. Whenever a mouse button event occurs the
> fl_mouse_button(), inside the callback always returns a 0. Any idea as
> to what i am doing wrong here.
>
> The callback definition is as follows,
>
> fl_add_canvas_handler(ui->canvas, ButtonPress, mbutton_cb, 0);
>
When you add a canvas handler, you must handle it directly by X, using
the XEvent.
Your callback function could be as follows,
int mbutton_cb(FL_OBJECT *ob, Window win, int w, int h, XEvent *xev,
void *ud)
{
switch(xev->xbutton.button)
{
case Button1:
printf("LEFT BUTTON\n");
break;
case Button3:
printf("RIGHT BUTTON\n");
break;
case Button2:
printf("MIDDLE BUTTON\n");
break;
default:
printf("%ld\n",fl_mouse_button());
break;
}
return 0;
}
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