kmpdfkit_demo/PDFViewer/Source/PDFViewerMode/PDFSettingsColorViewController.m

//
//  PDFSettingsColorViewController.m
//  PDFReader
//
//  Copyright © 2014-2022 PDF Technologies, Inc. All Rights Reserved.
//
//  The PDF Reader Sample applications are licensed with a modified BSD license.
//  Please see License for details. This notice may not be removed from this file.
//

#import "PDFSettingsColorViewController.h"

@interface PDFViewColorSlider : UISlider

@property (nonatomic,retain) CAGradientLayer *gradientLayer;

- (void)setColors:(NSArray *)colors;

@end

@implementation PDFViewColorSlider

- (instancetype)initWithCoder:(NSCoder *)aDecoder {
    if (self = [super initWithCoder:aDecoder]) {
        CAGradientLayer *gradientLayer = [CAGradientLayer layer];
        gradientLayer.cornerRadius = 2.0f;
        gradientLayer.startPoint = CGPointMake(0.0f, 0.5f);
        gradientLayer.endPoint = CGPointMake(1.0f, 0.5f);
        [self.layer addSublayer:gradientLayer];
        self.gradientLayer = gradientLayer;
        
        self.continuous = NO;
        self.minimumValue = 0;
        self.maximumValue = 1;
        self.minimumTrackTintColor = [UIColor clearColor];
        self.maximumTrackTintColor = [UIColor clearColor];
    }
    return self;
}

- (void)setColors:(NSArray *)colors {
    self.gradientLayer.colors = colors;
}

- (void)dealloc {
    [_gradientLayer release];
    [super dealloc];
}

- (void)layoutSubviews {
    [super layoutSubviews];
    CGRect rect = [self trackRectForBounds:self.bounds];
    rect.origin.y -= 5;
    rect.size.height += 10;
    self.gradientLayer.frame = rect;
}

@end

@interface PDFSettingsColorViewController () <UIPopoverPresentationControllerDelegate>

@property (nonatomic,assign) IBOutlet UIView *colorView;

@property (nonatomic,assign) IBOutlet PDFViewColorSlider *hueSlider;
@property (nonatomic,assign) IBOutlet PDFViewColorSlider *saturationSlider;
@property (nonatomic,assign) IBOutlet PDFViewColorSlider *brightnessSlider;

@property (nonatomic,assign) CGFloat hue;
@property (nonatomic,assign) CGFloat saturation;
@property (nonatomic,assign) CGFloat brightness;

@end

@implementation PDFSettingsColorViewController

#pragma mark - Init Methods

- (instancetype)initWithCoder:(NSCoder *)aDecoder {
    if (self = [super initWithCoder:aDecoder]) {
        _hue = 0;
        _saturation = 1;
        _brightness = 1;
    }
    return self;
}

- (void)dealloc {
    Block_release(_callback);
    [super dealloc];
}

#pragma mark - UIViewController Methods

- (void)viewDidLoad {
    [super viewDidLoad];
    
    // Do any additional setup after loading the view.
    self.preferredContentSize = CGSizeMake(280, 320);
    
    self.colorView.layer.cornerRadius = self.colorView.bounds.size.width/2.0;
    self.colorView.superview.layer.cornerRadius = self.colorView.superview.bounds.size.width/2.0;
    self.colorView.superview.layer.borderWidth = 1;
    self.colorView.superview.layer.borderColor = [UIColor colorWithRed:197.0/255.0 green:197.0/255.0 blue:197.0/255.0 alpha:1.0].CGColor;
    
    [self reloadData];
}

- (IBAction)sliderValueChanged_Color:(id)sender {
    self.hue = self.hueSlider.value;
    self.saturation = self.saturationSlider.value;
    self.brightness = self.brightnessSlider.value;
    [self reloadData];
    
    if (self.callback) {
        self.callback();
    }
}

- (void)reloadData {
    self.hueSlider.value = self.hue;
    self.saturationSlider.value = self.saturation;
    self.brightnessSlider.value = self.brightness;
    
    [self.hueSlider setColors:@[(id)[[UIColor colorWithHue:0
                                                saturation:self.saturation
                                                brightness:self.brightness
                                                     alpha:1] CGColor],
                                (id)[[UIColor colorWithHue:0.25
                                                saturation:self.saturation
                                                brightness:self.brightness
                                                     alpha:1] CGColor],
                                (id)[[UIColor colorWithHue:0.5
                                                saturation:self.saturation
                                                brightness:self.brightness
                                                     alpha:1] CGColor],
                                (id)[[UIColor colorWithHue:0.75
                                                saturation:self.saturation
                                                brightness:self.brightness
                                                     alpha:1] CGColor],
                                (id)[[UIColor colorWithHue:1
                                                saturation:self.saturation
                                                brightness:self.brightness
                                                     alpha:1] CGColor]]];
    [self.saturationSlider setColors:@[(id)[[UIColor colorWithHue:self.hue
                                                       saturation:0
                                                       brightness:self.brightness
                                                            alpha:1] CGColor],
                                       (id)[[UIColor colorWithHue:self.hue
                                                       saturation:1
                                                       brightness:self.brightness
                                                            alpha:1] CGColor]]];
    [self.brightnessSlider setColors:@[(id)[[UIColor colorWithHue:self.hue
                                                       saturation:self.saturation
                                                       brightness:0
                                                            alpha:1] CGColor],
                                       (id)[[UIColor colorWithHue:self.hue
                                                       saturation:self.saturation
                                                       brightness:1
                                                            alpha:1] CGColor]]];
    
    self.colorView.backgroundColor = [UIColor colorWithHue:self.hue saturation:self.saturation brightness:self.brightness alpha:1];
}

#pragma mark - Public Methods

- (void)setColor:(UIColor *)color {
    if (color) {
        [color getHue:&_hue saturation:&_saturation brightness:&_brightness alpha:NULL];
    }
}

- (UIColor *)color {
    return [UIColor colorWithHue:self.hue saturation:self.saturation brightness:self.brightness alpha:1.0];
}

- (void)showViewController:(UIViewController *)viewController inRect:(CGRect)rect {
    self.modalPresentationStyle = UIModalPresentationPopover;
    UIPopoverPresentationController *popVC = self.popoverPresentationController;
    popVC.delegate = self;
    popVC.sourceRect = rect;
    popVC.sourceView = viewController.view;
    [viewController presentViewController:self animated:YES completion:nil];
}

#pragma mark - UIPopoverPresentationControllerDelegate

- (UIModalPresentationStyle)adaptivePresentationStyleForPresentationController:(UIPresentationController *)controller traitCollection:(UITraitCollection *)traitCollection {
    return UIModalPresentationNone;
}

@end