PFColorAlertViewController.xm

#import "PFColorAlertViewController.h"
#import "PFHaloHueView.h"
#import "PFColorLitePreviewView.h"
#import "PFColorLiteSlider.h"
#import "UIColor+PFColor.h"

@interface PFColorAlertViewController () <PFHaloHueViewDelegate> {
    PFHaloHueView *_haloView;
    UIView *_blurView;
    UIButton *_hexButton;
    PFColorLiteSlider *_brightnessSlider;
    PFColorLiteSlider *_saturationSlider;
    PFColorLiteSlider *_alphaSlider;
    PFColorLitePreviewView *_litePreviewView;
    UIColor *_tintColor;
}
@end

#if __IPHONE_OS_VERSION_MAX_ALLOWED < 100000
typedef enum UIUserInterfaceStyle : NSInteger {
    UIUserInterfaceStyleUnspecified,
    UIUserInterfaceStyleLight,
    UIUserInterfaceStyleDark
} UIUserInterfaceStyle;
#endif

@interface UITraitCollection (iOS12_13)
@property (nonatomic, readonly) UIUserInterfaceStyle userInterfaceStyle;
@end

@interface _UIBackdropViewSettings : NSObject
+ (id)settingsForStyle:(long long)style;
@end

@interface _UIBackdropView : UIView
- (id)initWithFrame:(CGRect)frame
autosizesToFitSuperview:(BOOL)fitsSuperview
           settings:(_UIBackdropViewSettings *)settings;
@end


@implementation PFColorAlertViewController

- (id)initWithViewFrame:(CGRect)frame startColor:(UIColor *)startColor showAlpha:(BOOL)showAlpha {
    self = [super init];

    _tintColor = UIColor.blackColor;
    self.view.frame = frame;

    if (%c(_UIBackdropView)) {
        int style = 2010;
        if (@available(iOS 13, *)) {
            if ([UIScreen mainScreen].traitCollection.userInterfaceStyle == UIUserInterfaceStyleDark) {
                _tintColor = UIColor.whiteColor;
                style = 1100;
            }
        }

        _UIBackdropViewSettings *backSettings = [%c(_UIBackdropViewSettings) settingsForStyle:style];
        _blurView = [[%c(_UIBackdropView) alloc] initWithFrame:CGRectZero
                                       autosizesToFitSuperview:YES
                                                      settings:backSettings];
    } else {
        _blurView = [[UIView alloc] initWithFrame:frame];
        _blurView.backgroundColor = [[UIColor whiteColor] colorWithAlphaComponent:0.9f];
    }

    [self.view addSubview:_blurView];

    float padding = frame.size.width / 8;
    float width = frame.size.width - padding * 2;
    CGRect haloViewFrame = CGRectMake(padding, padding, width, width);

    _haloView = [[PFHaloHueView alloc] initWithFrame:haloViewFrame
                                            minValue:0
                                            maxValue:1
                                               value:startColor.hue
                                           tintColor:_tintColor
                                            delegate:self];
    [self.view addSubview:_haloView];

    CGRect sliderFrame = CGRectMake(padding,
                                    haloViewFrame.origin.y + haloViewFrame.size.height + padding / 2,
                                    width,
                                    40);

    _saturationSlider = [[PFColorLiteSlider alloc] initWithFrame:sliderFrame
                                                           color:startColor
                                                       tintColor:_tintColor
                                                           style:PFSliderBackgroundStyleSaturation];
    [self.view addSubview:_saturationSlider];

    sliderFrame.origin.y = sliderFrame.origin.y + sliderFrame.size.height;
    _brightnessSlider = [[PFColorLiteSlider alloc] initWithFrame:sliderFrame
                                                           color:startColor
                                                       tintColor:_tintColor
                                                           style:PFSliderBackgroundStyleBrightness];
    [self.view addSubview:_brightnessSlider];

    sliderFrame.origin.y = sliderFrame.origin.y + sliderFrame.size.height;
    _alphaSlider = [[PFColorLiteSlider alloc] initWithFrame:sliderFrame
                                                      color:startColor
                                                   tintColor:_tintColor
                                                      style:PFSliderBackgroundStyleAlpha];
    [self.view addSubview:_alphaSlider];

    _hexButton = [UIButton buttonWithType:UIButtonTypeCustom];
    [_hexButton setTitleColor:_tintColor forState:UIControlStateNormal];
    [_hexButton addTarget:self action:@selector(chooseHexColor) forControlEvents:UIControlEventTouchUpInside];
    [_hexButton setTitle:@"#" forState:UIControlStateNormal];
    _hexButton.frame = CGRectMake(self.view.frame.size.width - (25 + 10), 10, 25, 25);
    [self.view addSubview:_hexButton];

    float halfWidth = frame.size.width / 2;
    float previewPadding = padding * 2;
    float previewWidth = previewPadding * 2;
    CGRect litePreviewViewFrame = CGRectMake(halfWidth - previewPadding,
                                             haloViewFrame.origin.y + haloViewFrame.size.height / 2 - previewWidth / 2,
                                             previewWidth,
                                             previewWidth);

    _litePreviewView = [[PFColorLitePreviewView alloc] initWithFrame:litePreviewViewFrame
                                                           tintColor:_tintColor
                                                           mainColor:startColor
                                                       previousColor:startColor];
    [self.view insertSubview:_litePreviewView belowSubview:_haloView];


    [_saturationSlider.slider addTarget:self action:@selector(saturationChanged:) forControlEvents:UIControlEventValueChanged];
    [_brightnessSlider.slider addTarget:self action:@selector(brightnessChanged:) forControlEvents:UIControlEventValueChanged];
    [_alphaSlider.slider addTarget:self action:@selector(alphaChanged:) forControlEvents:UIControlEventValueChanged];

    _alphaSlider.hidden = !showAlpha;

    return self;
}

- (float)topMostSliderLastYCoordinate {
    UIView *firstVisibleSlider = !_alphaSlider.hidden ? _alphaSlider : _brightnessSlider;
    return firstVisibleSlider.frame.origin.y + firstVisibleSlider.frame.size.height;
}

- (void)setPrimaryColor:(UIColor *)primary {
    [_litePreviewView updateWithColor:primary];

    [_saturationSlider updateGraphicsWithColor:primary];
    [_brightnessSlider updateGraphicsWithColor:primary];
    [_alphaSlider updateGraphicsWithColor:primary];

    [_haloView setValue:primary.hue];
}

- (UIColor *)getColor {
    return _litePreviewView.mainColor;
}

- (void)hueChanged:(float)hue {
    UIColor *color = [UIColor colorWithHue:hue saturation:_litePreviewView.mainColor.saturation brightness:_litePreviewView.mainColor.brightness alpha:_litePreviewView.mainColor.alpha];
    [_litePreviewView updateWithColor:color];
    [_saturationSlider updateGraphicsWithColor:color hue:hue];
    [_brightnessSlider updateGraphicsWithColor:color hue:hue];
    [_alphaSlider updateGraphicsWithColor:color hue:hue];
}

- (void)saturationChanged:(UISlider *)slider {
    UIColor *color = [UIColor colorWithHue:_litePreviewView.mainColor.hue saturation:slider.value brightness:_litePreviewView.mainColor.brightness alpha:_litePreviewView.mainColor.alpha];
    [_litePreviewView updateWithColor:color];
    [_saturationSlider updateGraphicsWithColor:color];
    [_alphaSlider updateGraphicsWithColor:color];
}

- (void)brightnessChanged:(UISlider *)slider {
    UIColor *color = [UIColor colorWithHue:_litePreviewView.mainColor.hue saturation:_litePreviewView.mainColor.saturation brightness:slider.value alpha:_litePreviewView.mainColor.alpha];
    [_litePreviewView updateWithColor:color];
    [_brightnessSlider updateGraphicsWithColor:color];
    [_alphaSlider updateGraphicsWithColor:color];
}

- (void)alphaChanged:(UISlider *)slider {
    UIColor *color = [UIColor colorWithHue:_litePreviewView.mainColor.hue saturation:_litePreviewView.mainColor.saturation brightness:_litePreviewView.mainColor.brightness alpha:slider.value];
    [_litePreviewView updateWithColor:color];
    [_alphaSlider updateGraphicsWithColor:color];
}

- (void)chooseHexColor {
    NSString *title = @"Hex Color";
    NSString *message = @"Enter a hex color or copy it to your pasteboard.";
    NSString *cancelText = @"Close";
    NSString *setText = @"Set";
    NSString *copyText = @"Copy";

    if (%c(UIAlertController)) {
        UIAlertController *alertController = [UIAlertController alertControllerWithTitle:title
                                                                                 message:message
                                                                          preferredStyle:UIAlertControllerStyleAlert];
        [alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
            textField.placeholder = @"#123456";
        }];

        // Set
        [alertController addAction:[UIAlertAction actionWithTitle:setText
                                                            style:UIAlertActionStyleDefault
                                                          handler:^(UIAlertAction *_Nonnull action) {
            NSString *text = alertController.textFields.firstObject.text;
            UIColor *color;
            if ([text hasPrefix:@"#"] && (color = [UIColor PF_colorWithHex:text]))
                [self setPrimaryColor:color];
        }]];

        // Copy
        [alertController addAction:[UIAlertAction actionWithTitle:copyText
                                                            style:UIAlertActionStyleDefault
                                                          handler:^(UIAlertAction *_Nonnull action) {
            [[UIPasteboard generalPasteboard] setString:[UIColor hexFromColor:[self getColor]]];
        }]];

        [alertController addAction:[UIAlertAction actionWithTitle:cancelText
                                                            style:UIAlertActionStyleCancel
                                                          handler:nil]];

        [self presentViewController:alertController animated:YES completion:nil];
    } else {
        #pragma clang diagnostic push
        #pragma clang diagnostic ignored "-Wdeprecated-declarations"
        UIAlertView *prompt = [[UIAlertView alloc] initWithTitle:title
                                                         message:message
                                                        delegate:self
                                               cancelButtonTitle:cancelText
                                               otherButtonTitles:setText, copyText, nil];
        prompt.delegate = self;
        [prompt setAlertViewStyle:UIAlertViewStylePlainTextInput];
        [[prompt textFieldAtIndex:0] setText:[UIColor hexFromColor:[self getColor]]];
        [prompt show];
        #pragma clang diagnostic pop
    }
}

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
    if (buttonIndex == 1) {
        NSString *text = [alertView textFieldAtIndex:0].text;
        UIColor *color;
        if ([text hasPrefix:@"#"] && (color = [UIColor PF_colorWithHex:text]))
            [self setPrimaryColor:color];
    } else if (buttonIndex == 2) {
        [[UIPasteboard generalPasteboard] setString:[UIColor hexFromColor:[self getColor]]];
    }
}
#pragma clang diagnostic pop

- (void)presentPasteHexStringQuestion:(NSString *)pasteboard {
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Detected pasted color"
                                                                             message:@"It seems like your pasteboard consists of a hex color. Would you like to use it?"
                                                                      preferredStyle:UIAlertControllerStyleAlert];

    // Set from hex color
    [alertController addAction:[UIAlertAction actionWithTitle:@"Use pasteboard"
                                                        style:UIAlertActionStyleDefault
                                                      handler:^(UIAlertAction *_Nonnull action) {
        [self setPrimaryColor:[UIColor PF_colorWithHex:pasteboard]];
    }]];

    [alertController addAction:[UIAlertAction actionWithTitle:@"No"
                                                        style:UIAlertActionStyleCancel
                                                      handler:nil]];

    [self presentViewController:alertController animated:YES completion:nil];
}

- (BOOL)shouldAutorotate {
    return NO;
}

- (NSUInteger)supportedInterfaceOrientations {
    return UIInterfaceOrientationMaskPortrait;
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
    return UIInterfaceOrientationPortrait;
}

@end