NCZoomControls.m

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//
//  NCZoomControls.m
//  Zoom controls widget for navigation view
//
 
#import "NCZoomControls.h"
#import "NCZoomControlsConfig.h"
#import "NCWidgetStyles.h"
 
@interface NCZoomControls ()
@property (nonatomic, copy) NCZoomInCallback onZoomIn;
@property (nonatomic, copy) NCZoomOutCallback onZoomOut;
@property (nonatomic, strong, nullable) NCZoomControlsConfig *config;
@property (nonatomic, strong) UIStackView *stackView;
@property (nonatomic, strong, nullable) NSLayoutConstraint *stackWidthConstraint;
@property (nonatomic, strong, nullable) NSLayoutConstraint *stackHeightConstraint;
@end
 
@implementation NCZoomControls
 
- (instancetype)initWithOnZoomIn:(NCZoomInCallback)onZoomIn onZoomOut:(NCZoomOutCallback)onZoomOut {
    return [self initWithOnZoomIn:onZoomIn onZoomOut:onZoomOut config:nil];
}
 
- (instancetype)initWithOnZoomIn:(NCZoomInCallback)onZoomIn
                       onZoomOut:(NCZoomOutCallback)onZoomOut
                          config:(NCZoomControlsConfig *)config {
    self = [super init];
    if (self) {
        _onZoomIn = [onZoomIn copy];
        _onZoomOut = [onZoomOut copy];
        _config = config;
        [self setupUI];
    }
    return self;
}
 
- (void)setupUI {
    NCZoomControlsConfig *c = _config ?: [NCZoomControlsConfig defaultConfig];
    CGFloat width = c.buttonWidth > 0 ? c.buttonWidth : kNCStandardButtonWidth;
    CGFloat height = c.zoomControlsHeight > 0 ? c.zoomControlsHeight : kNCZoomControlsHeight;
    UIColor *bgColor = c.buttonBackgroundColor ?: kNCButtonBackgroundColorOpaque();
    UIColor *tintColor = c.textColor ?: kNCBaseBlackColor();
 
    UIButton *zoomOutButton = [UIButton buttonWithType:UIButtonTypeSystem];
    UIButton *zoomInButton = [UIButton buttonWithType:UIButtonTypeSystem];
 
    if (c.zoomInIcon) {
        [zoomInButton setImage:[c.zoomInIcon imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate] forState:UIControlStateNormal];
        zoomInButton.imageView.contentMode = UIViewContentModeScaleAspectFit;
    } else {
        [zoomInButton setTitle:@"+" forState:UIControlStateNormal];
    }
    if (c.zoomOutIcon) {
        [zoomOutButton setImage:[c.zoomOutIcon imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate] forState:UIControlStateNormal];
        zoomOutButton.imageView.contentMode = UIViewContentModeScaleAspectFit;
    } else {
        [zoomOutButton setTitle:@"−" forState:UIControlStateNormal];
    }
 
    zoomOutButton.backgroundColor = bgColor;
    zoomInButton.backgroundColor = bgColor;
    zoomOutButton.tintColor = tintColor;
    zoomInButton.tintColor = tintColor;
 
    zoomOutButton.layer.cornerRadius = kNCBorderRadius;
    zoomOutButton.layer.maskedCorners = kCALayerMinXMaxYCorner | kCALayerMaxXMaxYCorner;
    zoomInButton.layer.cornerRadius = kNCBorderRadius;
    zoomInButton.layer.maskedCorners = kCALayerMinXMinYCorner | kCALayerMaxXMinYCorner;
 
    zoomOutButton.titleLabel.font = [UIFont systemFontOfSize:kNCButtonFontSize];
    zoomInButton.titleLabel.font = [UIFont systemFontOfSize:kNCButtonFontSize];
 
    [zoomOutButton addTarget:self action:@selector(zoomOutPressed:) forControlEvents:UIControlEventTouchUpInside];
    [zoomInButton addTarget:self action:@selector(zoomInPressed:) forControlEvents:UIControlEventTouchUpInside];
 
    UIStackView *stack = [[UIStackView alloc] initWithArrangedSubviews:@[zoomInButton, zoomOutButton]];
    stack.axis = UILayoutConstraintAxisVertical;
    stack.distribution = UIStackViewDistributionFillEqually;
    stack.spacing = 0;
    stack.translatesAutoresizingMaskIntoConstraints = NO;
    stack.layer.shadowOpacity = kNCShadowOpacity;
    stack.layer.shadowRadius = kNCShadowRadius;
    stack.layer.shadowOffset = kNCShadowOffset;
    stack.layer.shadowColor = kNCShadowColor().CGColor;
    _stackView = stack;
 
    [self addSubview:stack];
 
    self.translatesAutoresizingMaskIntoConstraints = NO;
 
    [NSLayoutConstraint activateConstraints:@[
        [stack.leadingAnchor constraintEqualToAnchor:self.leadingAnchor],
        [stack.trailingAnchor constraintEqualToAnchor:self.trailingAnchor],
        [stack.topAnchor constraintEqualToAnchor:self.topAnchor],
        [stack.bottomAnchor constraintEqualToAnchor:self.bottomAnchor],
    ]];
    self.stackWidthConstraint = [stack.widthAnchor constraintEqualToConstant:width];
    self.stackHeightConstraint = [stack.heightAnchor constraintEqualToConstant:height];
    self.stackWidthConstraint.active = YES;
    self.stackHeightConstraint.active = YES;
}
 
- (void)applyConfig:(NCZoomControlsConfig *)config {
    _config = config;
    if (!_stackView || _stackView.arrangedSubviews.count < 2) return;
    UIButton *zoomInButton = (UIButton *)_stackView.arrangedSubviews[0];
    UIButton *zoomOutButton = (UIButton *)_stackView.arrangedSubviews[1];
 
    NCZoomControlsConfig *c = config ?: [NCZoomControlsConfig defaultConfig];
    UIColor *bgColor = c.buttonBackgroundColor ?: kNCButtonBackgroundColorOpaque();
    UIColor *tintColor = c.textColor ?: kNCBaseBlackColor();
 
    if (c.zoomInIcon) {
        [zoomInButton setImage:[c.zoomInIcon imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate] forState:UIControlStateNormal];
        [zoomInButton setTitle:nil forState:UIControlStateNormal];
    } else {
        [zoomInButton setImage:nil forState:UIControlStateNormal];
        [zoomInButton setTitle:@"+" forState:UIControlStateNormal];
    }
    if (c.zoomOutIcon) {
        [zoomOutButton setImage:[c.zoomOutIcon imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate] forState:UIControlStateNormal];
        [zoomOutButton setTitle:nil forState:UIControlStateNormal];
    } else {
        [zoomOutButton setImage:nil forState:UIControlStateNormal];
        [zoomOutButton setTitle:@"−" forState:UIControlStateNormal];
    }
 
    zoomInButton.backgroundColor = bgColor;
    zoomOutButton.backgroundColor = bgColor;
    zoomInButton.tintColor = tintColor;
    zoomOutButton.tintColor = tintColor;
 
    CGFloat width = c.buttonWidth > 0 ? c.buttonWidth : kNCStandardButtonWidth;
    CGFloat height = c.zoomControlsHeight > 0 ? c.zoomControlsHeight : kNCZoomControlsHeight;
    if (self.stackWidthConstraint) {
        self.stackWidthConstraint.constant = width;
    }
    if (self.stackHeightConstraint) {
        self.stackHeightConstraint.constant = height;
    }
}
 
- (void)zoomOutPressed:(UIButton *)sender {
    if (self.onZoomOut) {
        self.onZoomOut();
    }
}
 
- (void)zoomInPressed:(UIButton *)sender {
    if (self.onZoomIn) {
        self.onZoomIn();
    }
}
 
@end