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Re: NSTrackingArea + cursorUpdate: problem

Subject: Re: NSTrackingArea + cursorUpdate: problem
From: Nygard Steve <email@hidden>
Date: Wed, 28 Nov 2007 20:52:16 -0700
Delivered-to: email@hidden
Delivered-to: email@hidden


On Nov 28, 2007, at 2:41 PM, Raphael Sebbe@Google wrote:

Hi,
I am trying to use the new cursor handling mecanism of Leopard.
My view has some regions (rects) inside of it where the cursor should be changed, otherwise should be a regular arrow.

1. From the doc, it is unclear to me if NSTrackingCursorUpdate can be used or not in that case (rect != bounds). At least what I get is the cursorUpdate: method being invoked both when entering AND leaving the area. Which means the cursor never becomes an arrow again inside that view. How should this be handled ?

Store the cursor in the user info when you set up the tracking areas, and then you can do this:

- (void)cursorUpdate:(NSEvent *)event;
{
    NSPoint hitPoint;
    NSTrackingArea *trackingArea;

trackingArea = [event trackingArea]; hitPoint = [self convertPoint:[event locationInWindow] fromView:nil];

    if ([self mouse:hitPoint inRect:[trackingArea rect]]) {
        [[[trackingArea userInfo] objectForKey:@"cursor"] set];
    } else {
        [[NSCursor arrowCursor] set];
    }
}

2. Also the doc states that NSTrackingArea can overlap in different views. What about overlapping in the same view ?


I don't know.  You could try it and see what happens.

--
Steve

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References:
	>NSTrackingArea + cursorUpdate: problem (From: Raphael Sebbe@Google <email@hidden>)

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