Hi,
I've been using FloatCanvas for 2 years now to draw a visual of a
manufactured product. Each component going into the product can be
clicked on by the user, and from their they can change dimensions and
other properties. Couldn't be much slicker, and I'm really happy.
However, now I need to support Mac (previously I supported Windows and
Linux).
Up until now I've been setting the background color of the canvas to
match the background color of the parent, drawing the product, and then
calling ZoomToBB() to get the drawing to go as large as it can go within
the bounds of the windows size. Setting the background color to match
gives the canvas a borderless look that works with the rest of the frame
(the canvas part is only about 1/5 of the frame).
However, Mac has these really juicy backgrounds like the alternating
grey/silver stripes, so the above strategy shows the border of the
canvas. I discovered that if I set the background color of the canvas to
None, the background would become transparent; problem solved.
Except when I resize the parent frame, and my onResize handler calls
ZoomToBB() to get the drawing to fit in the new size, artifacts are left
behind. The only way I've found to make them go away is to do a
Canvas.Refresh at least 50ms after calling ZoomToBB().
In case it helps with a better fix, here's how I've worked around this
in my code:
402 class FC(FloatCanvas.FloatCanvas):
403 def ZoomToBB(self, *args, **kwargs):
404 if sys.platform.startswith("darwin"):
405 # Mac's transparent background shows artifacts when
# zooming. Worked out the
406 # recipe to work around this by trial and error:
407 def do():
408 super(FC, self).ZoomToBB(*args, **kwargs)
409 dabo.ui.callAfterInterval(50, self.Refresh)
410 dabo.ui.callAfter(do)
411 else:
412 super(FC, self).ZoomToBB(*args, **kwargs)
dabo.ui.callAfter() maps to wx.CallAfter(); dabo.ui.callAfterInterval
maps to wx.FutureCall()
Paul
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