I have overlaid a transparent window over my NSDocument's main window. My intent is to draw textual notifications to it, such as "Processing...", "20 things selected...". The idea is partially experimental, etc. I thought it would be neat to display a spinning icon in the a subclassed content view of the overlay window when the program is doing something lengthy like saving, exporting pdfs, etc. A created a new thread that would run for the duration of an operation. This thread would call drawrect which would draw my spinning icon. I create the new thread before a length operation. I assume that the lengthy operation would occur on the main thread while the drawing operation happens on the secondary thread. Utlimately my drawrect method doesn't get called in the secondary thread. Am I going about this all wrong?
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