Cocoa already coalesces updates in this way, so when drawRect: is
called, the list of rects is the merged list.
I does raise a question though - is there a way to get, at any point
in time, the list of merged rects needing update from a view *at that
point* - in other words, outside of a drawRect: call, can I found out
what has been marked for update so far? That would be useful.
G.
On 3 May 2008, at 11:22 pm, Jean-Daniel Dupas wrote:
Why not merging your drawing invocation instead of queuing them.
Each time a drawRect is called on your view, get the rects that need
to be refreshed, and add them to a single array of rect.
One each loop, the drawing thread will picks all rects in the list
and draw the view one time. Like this, if there is overlapping rects
in the queue it will refresh them only once.
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