On 20 Dec 2008, at 11:20 am, David Alter wrote:
I want to draw in a NSView but not when drawRect is called.
Why? There are very few situations when this is required or appropriate.
To do this I
understand that I need to call lockFocus before drawing and
unlockFocus
after. The drawing appears to happen but it is not until I
deactivate the
window do I see my results. How can I get it to refresh once I have
done my
drawing?
You need to flush it to the screen. But don't - it's just not the
right way to do drawing.
To test this out I have sub classed NSView and overloaded mouseDown.
I added
the following code.
Store the rects to be drawn in a list - your view could own this list
for simplicity while you are experimenting. Then invalidate the rect
you need to repaint in mouse down. -drawRect: then just iterates over
the list and draws those rects that intersect the update area.
This is way, way easier than trying to fudge around drawing in a non-
standard manner. Learn it and love it.
hth,
Graham
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