Hi,
For me personally, coordinates are probably the most unintuitive aspect
of Racket's GUI management. The problem comes up again and again, and I
never get it right, so maybe someone can clarify this once and for all.
I have a mouse-event% in on-event of a snip% and would like to display
a floating frame% just below the mouse.
Question 1: What is the right way to obtain the window in a potentially
nested hierarchy of editors? I'm currently using:
(define top-window (and-let* ((canvas (get-canvas))
(top (send canvas get-top-level-window)))
top))
is that correct?
Question 2: How do I obtain the right coordinates for the frame% that I
would like to show below the mouse?
I assume it has something to do with top-window above, but how do I
convert from the coordinates of the mouse-event to the 'right'
coordinates? Currently, the frame% appears offset about 20 to 20 pixels
below the top-window's top-left corner and not at all where the mouse
is located.
Are the mouse-event coordinates relative to the editor? Or relative to
the snip within the editor? How do I convert them?
Question 3: Suppose I want to do the same with a snip% displayed in a
text% with one editor-canvas%, i.e., show a floating window just below
the snip%. Use cases: tooltips, spell corrections, etc.
How do I do that?
Thanks a lot in advance!
Best,
Erich
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