mouseMoved: or multiple trackingRects?
mouseMoved: or multiple trackingRects?
- Subject: mouseMoved: or multiple trackingRects?
- From: "Richard Pollock" <email@hidden>
- Date: Wed, 8 Aug 2007 23:28:29 +0100
Dear list,
I have a custom NSView that displays a DNA sequence (a string
containing the letters A,T,C and G) horizontally with letter spacing
controlled by an NSSlider. I've managed to implement mouse tracking
such that a vertical bar (extending to the full height of the view)
follows the mouse left and right along the view using mouseMoved:
inside a trackingRect covering the whole view.
However, I'd now like it to "snap" to each of the letters in the
sequence. I could continue using mouseMoved: and only show the box at
certain positions, but I wondered whether using a trackingRect for
every letter in the sequence would work better (using mouseEntered:
and mouseExited: for each one to highlight it).
Has anyone tried either of these methods and, if so, what were your
experiences? Would having up to ~200 trackingRects in the view present
any obvious problem? Googling "multiple tracking rects/mouseMoved:"
hasn't thrown up anything obvious...
Many thanks,
Rich
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