光标在NSTextView顶部

Question

I have implemented an iOS style NSScrollView by adding a knob subview to the NSScrollView. The implementation works just fine except for one thing - the cursor change over the knob view.

I am using NSView s -resetCursorRects method to setup the cursor rectangle.

- (void)resetCursorRects {
  [self addCursorRect:self.knobFrame cursor:[NSCursor pointingHandCursor]];
}

This works too, but the Cursor is immediately reset to the IBeam style as soon as I cross the cursor rect boundary.

How can I prevent this? Has it something to do with the knob view not being opaque?

UPDATE 0:

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I also tried to implement it with a normal NSScroller and forcing the scroller to overlay the NSClipView in the scroll view's -tile method, but it seems regardless of what view is placed on top of the NSTextView it always enforces the IBeam cursor type.

UPDATE 1:

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I found this mailing list entry that suggests overriding the NSTextView s -mouseMoved , but since this is not a satisfying solution for a robust custom NSScrollView implementation its not really an option.

Answer 1

Setting up an NSTrackingArea in the NSScroller with the NSTrackingMouseMoved option set and implementing

- (void)mouseMoved:(NSEvent *)theEvent {
  [[NSCursor pointingHandCursor] set];
}

does the trick.