FunkyOverlayWindow/TransparentButtonCell.m
/* |
File: TransparentButtonCell.m |
Abstract: This NSButtonCell subclass knows how to draw the button frame transparent, while |
the actual content stays non-transparent. It does this by rendering the button |
into an NSImage, drawing the image with transparancy back into the control view, |
and then drawing the button contents again. |
Version: 1.1 |
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*/ |
#import "TransparentButtonCell.h" |
@implementation TransparentButtonCell |
- (void)drawWithFrame:(NSRect)cellFrame inView:(NSView *)controlView |
{ |
NSImage *alphaImage; |
NSRect alphaImageRect = { NSZeroPoint, cellFrame.size }; |
alphaImage = [[NSImage alloc] initWithSize:alphaImageRect.size]; |
[alphaImage setFlipped:[controlView isFlipped]]; |
[alphaImage lockFocus]; |
BOOL wasEnabled = [self isEnabled]; |
[self setEnabled:YES]; |
// Draw the default button cell frame in the image |
[super drawWithFrame:alphaImageRect inView:controlView]; |
[self setEnabled:wasEnabled]; |
[alphaImage unlockFocus]; |
// Draw the image with partial transparency into the control view |
[alphaImage drawAtPoint:cellFrame.origin fromRect:alphaImageRect operation:NSCompositeSourceOver fraction:0.75]; |
// Draw the contents of the interior button image again, this time without transparency |
[self drawInteriorWithFrame:cellFrame inView:controlView]; |
[alphaImage release]; |
} |
@end |
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