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69 lines
2.6 KiB
Objective-C
Executable file
69 lines
2.6 KiB
Objective-C
Executable file
//
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// DCRoundSwitchKnobLayer.m
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//
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// Created by Patrick Richards on 29/06/11.
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// MIT License.
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//
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// http://twitter.com/patr
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// http://domesticcat.com.au/projects
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// http://github.com/domesticcatsoftware/DCRoundSwitch
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//
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#import "DCRoundSwitchKnobLayer.h"
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CGGradientRef CreateGradientRefWithColors(CGColorSpaceRef colorSpace, CGColorRef startColor, CGColorRef endColor);
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@implementation DCRoundSwitchKnobLayer
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@synthesize gripped;
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- (void)drawInContext:(CGContextRef)context
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{
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CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray();
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CGRect knobRect = CGRectInset(self.bounds, 2, 2);
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CGFloat knobRadius = self.bounds.size.height - 2;
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// knob outline (shadow is drawn in the toggle layer)
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CGContextSetStrokeColorWithColor(context, [UIColor colorWithWhite:0.62 alpha:1.0].CGColor);
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CGContextSetLineWidth(context, 1.5);
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CGContextStrokeEllipseInRect(context, knobRect);
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CGContextSetShadowWithColor(context, CGSizeMake(0, 0), 0, NULL);
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// knob inner gradient
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CGContextAddEllipseInRect(context, knobRect);
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CGContextClip(context);
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CGColorRef knobStartColor = [UIColor colorWithWhite:0.82 alpha:1.0].CGColor;
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CGColorRef knobEndColor = (self.gripped) ? [UIColor colorWithWhite:0.894 alpha:1.0].CGColor : [UIColor colorWithWhite:0.996 alpha:1.0].CGColor;
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CGPoint topPoint = CGPointMake(0, 0);
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CGPoint bottomPoint = CGPointMake(0, knobRadius + 2);
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CGGradientRef knobGradient = CreateGradientRefWithColors(colorSpace, knobStartColor, knobEndColor);
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CGContextDrawLinearGradient(context, knobGradient, topPoint, bottomPoint, 0);
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CGGradientRelease(knobGradient);
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// knob inner highlight
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CGContextAddEllipseInRect(context, CGRectInset(knobRect, 0.5, 0.5));
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CGContextAddEllipseInRect(context, CGRectInset(knobRect, 1.5, 1.5));
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CGContextEOClip(context);
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CGGradientRef knobHighlightGradient = CreateGradientRefWithColors(colorSpace, [UIColor whiteColor].CGColor, [UIColor colorWithWhite:1.0 alpha:0.5].CGColor);
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CGContextDrawLinearGradient(context, knobHighlightGradient, topPoint, bottomPoint, 0);
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CGGradientRelease(knobHighlightGradient);
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CGColorSpaceRelease(colorSpace);
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}
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CGGradientRef CreateGradientRefWithColors(CGColorSpaceRef colorSpace, CGColorRef startColor, CGColorRef endColor)
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{
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CGFloat colorStops[2] = {0.0, 1.0};
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CGColorRef colors[] = {startColor, endColor};
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CFArrayRef colorsArray = CFArrayCreate(NULL, (const void**)colors, sizeof(colors) / sizeof(CGColorRef), &kCFTypeArrayCallBacks);
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CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, colorsArray, colorStops);
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CFRelease(colorsArray);
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return gradient;
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}
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- (void)setGripped:(BOOL)newGripped
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{
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gripped = newGripped;
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[self setNeedsDisplay];
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}
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@end
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