On 10/14/11 10:04, David wrote:
> I would exepect that creating an Fl_Group (then calling beging if needed (not
> sure if constructor calls) then when adding the round buttons x,y would be
> relative to the group not the window, but it appears to be based on the
> window not the group? Is that correct?
Yes, all widget and drawing coords are relative
to the parent window.
A group is just a grouping widget, it does not affect
the coordinate space of its children.
If you want coords relative to the group, replace the
group with a window instead.. then coordinates will
be relative to the 'window-in-a-window'.
The below example shows a window-in-a-window situation:
win1 is the outer window,
win2 is the inner window (exists inside win1, like a group)
A button is created at position 10,10 in each:
but1 is created inside win1,
but2 is created inside win2.
You'll notice even though both buttons are both positioned at 10,10,
each is relative to its parent window:
#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Button.H>
int main() {
Fl_Window win1(400,400,"Win1"); // create outer window
win1.begin();
Fl_Button but1(10,10,140,25,"Button 1"); // create button#1
inside win1 at 10,10: coords relative to win1
Fl_Window win2(100,100,200,200,"Win2"); // create inner window
(window-in-a-window)
win2.begin();
Fl_Button but2(10,10,140,25,"Button 2"); // create button#2
inside win2: coords relative to win2
win2.end();
win2.color(FL_RED); // make the inner
window red so we can see it
//win2.show(); // don't need to show()
a window that's inside another
win1.end();
win1.show();
return(Fl::run());
}
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