I'm trying to use IKImageBrowser class for something which is supposed to
resemble Finder's icon view appearance. Hence, I need quite customized item
titles, e.g. multiline string, oval gradient background (like Finder's label
indicators), etc. Customizing item's title frame and views title (setting
custom paragraph style with custom truncating etc.) didn't give any results,
item titles remained single-lined. And besides, I would't be able to do
anything about other graphics element, which are part of item's title in my
case.
Therefore I took an approach to drive item titles myself in the item's cell
background (IKImageBrowserCellBackgroundLayer) layer. I supplied a custom
CALayer for that layer and implemented it's drawing delegate method. Here's how
that code looks like:
- (CALayer *)layerForType:(NSString *)aType
{
if ([aType isEqualToString:IKImageBrowserCellBackgroundLayer])
{
CALayer *result = [CALayer layer];
[result setDelegate:self];
[result setFrame:[self frame]];
[result setName:aType];
[result setNeedsDisplay];
return result;
}
return [super layerForType:aType];
}
- (void)drawLayer:(CALayer *)aLayer inContext:(CGContextRef)aContext
{
if ([[aLayer name] isEqualToString:IKImageBrowserCellBackgroundLayer])
{
// Set the current context.
[NSGraphicsContext saveGraphicsState];
[NSGraphicsContext setCurrentContext:[NSGraphicsContext
graphicsContextWithGraphicsPort:aContext flipped:[self imageBrowserView]]];
// Draw here...
[NSGraphicsContext restoreGraphicsState];
}
}
This works fine in general, but I'm facing two problems I can't find a way to
solve:
1. All string drawing in the cell's background layer appear without
antialiasing. Other drawing (Bezier Paths, images…) produce expected results.
2. All drawing in the cell's background layer in NOT retina-compliant! Not
strings, not any other drawing.
I should note that I used standard NSImage, NSBezierPath and NSString drawing
methods. Drawing exactly the same contents with the same code in a custom view
produces expected results (antialiased strings, all fine on both non-retina and
retina screens).
I haven't done many things with CALayers in the past, so maybe I'm missing some
setting to make this work, but it doesn't look like that looking at that class'
public API. On the other hand I find it hard to believe that IKImageBrowserView
custom drawing onto its layers is not retina-compliant!
If necessary, I can provide sample snapshots of results on displays of both
type.
Hopefully will someone know how to solve this. Thanks in advance.
-- Dragan
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