On Thu, Aug 23, 2012 at 8:09 AM, Graham Cox <graham....@bigpond.com> wrote: > > On 23/08/2012, at 9:16 PM, Koen van der Drift <koenvanderdr...@gmail.com> > wrote: > >> Another update, I guess I love to talk to myself. >> >> I got the drawing part done as follows: >> >> >> CALayer *aLayer = [CALayer layer]; >> NSRect r = [self.layoutManager boundingRectForGlyphRange: aRange >> inTextContainer: self.textContainer]; >> >> aLayer.backgroundColor = CGColorCreateGenericRGB (0.2, 0.2, 0.2, >> 0.2); // obviously this will be changed to something nicer >> aLayer.frame = r; >> aLayer.cornerRadius = 6.0f; >> >> [self.layer addSublayer: aLayer]; >> >> >> There are two problems: >> >> 1. the y-location of the layer that is drawn is wrong, I think it has to do >> with the coordinates being flipped > > Text views generally use flipped coordinates (since most text systems render > top-down). You may need to set the -geometryFlipped property of the CALayer > to match.
I already tried that, but it didn't put the CALayer in the right spot. I'll keep trying things, probably need to offset the rect.origin.y value. > >> 2. when the range contains a line break, I get the rect for two whole lines, >> not just the glyphs. > > > You probably want to use [NSLayoutManager rectArrayForCharacterRange:....] > instead, which gives you all of the rectangles necessary to perform a > highlight, which can consist of numerous parts, considering a text highlight > can extend over many lines, be disjoint, etc. Of course you can't just set a > CALayer frame with this - it might be better to create a custom layer that > can draw the necessary rectangles behind the text. Good idea, I could maybe create a CALayer as a sublayer for each rect in th erectArray. Thanks, - Koen. _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
