Tracking Rectangles for feedback on graphic elements
Tracking Rectangles for feedback on graphic elements
- Subject: Tracking Rectangles for feedback on graphic elements
- From: Ian Jackson <email@hidden>
- Date: Wed, 1 Mar 2006 21:08:11 +1300
Hi all,
Are tracking rectangles useful for providing feedback when the mouse
hovers over a handle on a graphic element such as the end of a line?
I'm wanting to make my lines selectable, and be able to grab one end
and drag it and so on (all the usual things you'd expect to do with a
line). So I want to have a square appear when you hover over the end
of the line to give the suggestion that you can grab it.
At first glance it looks like tracking rectangles could be useful
here, but then the owner of the tracking rectangle has to be able to
receive mouseEntered events, and you have to update the tracking
rectangle every time the view changes within the window. Fine for a
few, but if you've drawn a whole load of lines, each with a tracking
rectangle at each end and in the middle, it'll have to cycle through
them all every time there's a change. I'd like it if the line itself
could own the rectangle too, so that it was automatically obvious
what line the tracking rectangle corresponded to, but of course the
rectangle still has to have relevance in the context of the view.
Am I barking up the wrong tree here and would I be better off writing
this sort of thing myself?
Ian.
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