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NSView with gradient background

/ Published in: Objective C
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  1. @interface ColorGradientView : NSView
  2. {
  3.   NSColor *startingColor;
  4.   NSColor *endingColor;
  5.   int angle;
  6. }
  7.  
  8. // Define the variables as properties
  9. @property(nonatomic, retain) NSColor *startingColor;
  10. @property(nonatomic, retain) NSColor *endingColor;
  11. @property(assign) int angle;
  12.  
  13. @end
  14.  
  15. @implementation ColorGradientView
  16.  
  17. // Automatically create accessor methods
  18. @synthesize startingColor;
  19. @synthesize endingColor;
  20. @synthesize angle;
  21.  
  22. - (id)initWithFrame:(NSRect)frame;
  23. {
  24.   if (self = [super initWithFrame:frame]) {
  25.     [self setStartingColor:[NSColor colorWithCalibratedWhite:1.0 alpha:1.0]];
  26.     [self setEndingColor:nil];
  27.     [self setAngle:270];
  28.   }
  29.   return self;
  30. }
  31.  
  32. - (void)drawRect:(NSRect)rect;
  33. {
  34.   if (endingColor == nil || [startingColor isEqual:endingColor]) {
  35.     // Fill view with a standard background color
  36.     [startingColor set];
  37.     NSRectFill(rect);
  38.   }
  39.   else {
  40.     // Fill view with a top-down gradient
  41.     // from startingColor to endingColor
  42.     NSGradient* aGradient = [[[NSGradient alloc]
  43.         initWithStartingColor:startingColor
  44.         endingColor:endingColor] autorelease];
  45.     [aGradient drawInRect:[self bounds] angle:angle];
  46.   }
  47. }
  48.  
  49. - (void)setStartingColor:(NSColor *)newColor;
  50. {
  51. 	[startingColor autorelease];
  52. 	startingColor = [newColor retain];
  53.  
  54. 	[self setNeedsDisplay:YES];
  55. }
  56.  
  57. - (void)setEndingColor:(NSColor *)newColor;
  58. {
  59. 	[endingColor autorelease];
  60. 	endingColor = [newColor retain];
  61.  
  62. 	[self setNeedsDisplay:YES];
  63. }
  64.  
  65. - (void)dealloc;
  66. {
  67. 	[self setStartingColor:nil];
  68. 	[self setEndingColor:nil];
  69. 	[super dealloc];
  70. }
  71.  
  72. @end

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