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//
// --------------------------------------------
// Copyright (C) 2011 by Simon Blommegård
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
// --------------------------------------------
//
// SBGradientOverlayLayer.m
// SBTickerView
//
// Created by Simon Blommegård on 2011-12-10.
// Copyright 2011 Simon Blommegård. All rights reserved.
//
#import "SBGradientOverlayLayer.h"
@interface SBGradientOverlayLayer ()
@property (nonatomic, assign) CGFloat minimumOpacity;
@property (nonatomic, assign) CGFloat maximumOpacity;
@property (nonatomic, strong) CAGradientLayer *gradientLayer;
@property (nonatomic, strong) CALayer *gradientMaskLayer;
@end
@implementation SBGradientOverlayLayer
@synthesize type = _type;
@synthesize segment = _segment;
@dynamic gradientOpacity;
@synthesize minimumOpacity = _minimumOpacity;
@synthesize maximumOpacity = _maximumOpacity;
@synthesize gradientLayer = _gradientLayer;
@synthesize gradientMaskLayer = _gradientMaskLayer;
- (id)initWithStyle:(SBGradientOverlayLayerType)type segment:(SBGradientOverlayLayerSegment)segment {
if ((self = [super init])) {
_type = type;
_segment = _segment;
[self setMasksToBounds:YES];
[self addSublayer:self.gradientLayer];
[self setContentsScale:[[UIScreen mainScreen] scale]];
_minimumOpacity = 0.;
[self setGradientMaskLayer:[CALayer layer]];
[_gradientMaskLayer setContentsScale:[[UIScreen mainScreen] scale]];
[_gradientLayer setMask:_gradientMaskLayer];
if (type == SBGradientOverlayLayerTypeFace) {
[_gradientLayer setColors:[NSArray arrayWithObjects:
(__bridge id)[UIColor colorWithWhite:0. alpha:.5].CGColor,
(__bridge id)[UIColor colorWithWhite:0. alpha:1.].CGColor,
nil]];
[_gradientLayer setLocations:[NSArray arrayWithObjects:
[NSNumber numberWithFloat:0.],
[NSNumber numberWithFloat:1.],
nil]];
_maximumOpacity = .75;
} else {
[_gradientLayer setColors:[NSArray arrayWithObjects:
(__bridge id)[UIColor colorWithWhite:0. alpha:0.].CGColor,
(__bridge id)[UIColor colorWithWhite:0. alpha:.5].CGColor,
(__bridge id)[UIColor colorWithWhite:0. alpha:1.].CGColor,
nil]];
[_gradientLayer setLocations:[NSArray arrayWithObjects:
[NSNumber numberWithFloat:.2],
[NSNumber numberWithFloat:.4],
[NSNumber numberWithFloat:1.],
nil]];
_maximumOpacity = 1.;
}
if (segment == SBGradientOverlayLayerSegmentTop) {
[self setContentsGravity:kCAGravityBottom];
[_gradientLayer setStartPoint:CGPointMake(0., 0.)];
[_gradientLayer setEndPoint:CGPointMake(0., 1.)];
[_gradientMaskLayer setContentsGravity:kCAGravityBottom];
} else {
[self setContentsGravity:kCAGravityTop];
[_gradientLayer setStartPoint:CGPointMake(0., 1.)];
[_gradientLayer setEndPoint:CGPointMake(0., 0.)];
[_gradientMaskLayer setContentsGravity:kCAGravityTop];
}
[_gradientLayer setOpacity:_minimumOpacity];
}
return self;
}
- (void)layoutSublayers {
[super layoutSublayers];
[_gradientLayer setFrame:self.bounds];
[_gradientMaskLayer setFrame:self.bounds];
}
#pragma mark - Properties
- (CAGradientLayer *)gradientLayer {
if (!_gradientLayer) {
_gradientLayer = [[CAGradientLayer alloc] init];
[_gradientLayer setFrame:self.bounds];
}
return _gradientLayer;
}
- (CGFloat)gradientOpacity {
return _gradientLayer.opacity;
}
- (void)setGradientOpacity:(CGFloat)opacity {
[_gradientLayer setOpacity:(opacity * (_maximumOpacity - _minimumOpacity) + _minimumOpacity)];
}
- (void)setContents:(id)contents {
[super setContents:contents];
[_gradientMaskLayer setContents:contents];
}
@end
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