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Re: NSCursor category

On Jun 30, 2004, at 8:20, Yann Bizeul wrote:

From Apple's docs : (NSCursor/mouseEntered:)
"This message is automatically sent to the receiver when the cursor enters a tracking rectangle owned by the receiver..."
What I understand from this, is that this method is called for a trackingRect, not a cursorRect, and only if the owner is your cursor. Is this the case ?

I had been assuming that [view addCursorRect: rect cursor:cursor] just calls [view addTrackingRect: rect owner:cursor userdata:nil assumeInside:NO] and keeps a collection of any ids returned (so that it can make the appropriate removeTrackingRect: calls from within discardCursorRects).

That would work if the default NSCursor mouseEntered/mouseExited behaviour pushed and popped itself as the current cursor. But looking at it again, given the existence of setOnMouseEntered: which is used to decide whether or not a cursor will do just that, it seems unlikely, so my latest guess is that [view addCursorRect:rect cursor:cursor] actually calls [[view window] addCursorRect:rect cursor:cursor], which handles a collection of tracking rects that push and pop cursors for every view in the window.

Personaly, I always use resetCursorRect in my view to play with trackingRect *and* cursorrect. Because this method is always called when rects need to be reset, you can do your stuff here. The only thing to not forget, is keep a reference for each of your trackingRect, delete them all in resetCursorRect, and re create them after this.

I think this is the approach I'll take. Do you use an NSMutableSet or is there a better alternative?

Thanks!

Hamish
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References: 
 >NSCursor category (From: Hamish Allan <email@hidden>)
 >Re: NSCursor category (From: Yann Bizeul <email@hidden>)



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