View/SlideImageView.m
/* |
File: SlideImageView.m |
Abstract: SlideImageView is a simple subclass of NSImageView that adds a bit of drawing for a more slide-like appearance, and passes mouseDown: events to its superview (which in the Cocoa Slides application is a SlideCarrierView). |
Version: 1.5 |
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*/ |
#import "SlideImageView.h" |
@implementation SlideImageView |
// Pass mouseDown: events through to our superview. |
- (void)mouseDown:(NSEvent *)theEvent { |
[[self superview] mouseDown:theEvent]; |
} |
// Fill in semitransparent gray bands in any areas that the image doesn't cover, to give a more slide-like appearance. |
- (void)drawRect:(NSRect)rect { |
NSImage *image = [self image]; |
if (image != nil && [self imageScaling] == NSScaleProportionally) { |
NSSize imageSize = [image size]; |
NSSize viewSize = [self bounds].size; |
if (imageSize.height > 0.0 && viewSize.height > 0.0) { |
CGFloat imageAspectRatio = imageSize.width / imageSize.height; |
CGFloat viewAspectRatio = viewSize.width / viewSize.height; |
[[NSColor colorWithCalibratedWhite:0.0 alpha:0.8] set]; |
if (imageAspectRatio > viewAspectRatio) { |
// Fill in bands at top and bottom. |
CGFloat thumbnailHeight = viewSize.width / imageAspectRatio; |
CGFloat bandHeight = 0.5 * (viewSize.height - thumbnailHeight); |
NSRectFill(NSMakeRect(0, 0, viewSize.width, bandHeight)); |
NSRectFill(NSMakeRect(0, viewSize.height - bandHeight, viewSize.width, bandHeight)); |
} else if (imageAspectRatio < viewAspectRatio) { |
// Fill in bands at left and right. |
CGFloat thumbnailWidth = viewSize.height * imageAspectRatio; |
CGFloat bandWidth = 0.5 * (viewSize.width - thumbnailWidth); |
NSRectFill(NSMakeRect(0, 0, bandWidth, viewSize.height)); |
NSRectFill(NSMakeRect(viewSize.width - bandWidth, 0, bandWidth, viewSize.height)); |
} |
} |
} |
// Now let NSImageView do its drawing. |
[super drawRect:rect]; |
} |
@end |
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