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ArrowBarButton.m
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ArrowBarButton.m
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//
// ArrowBarButton.m
// iSH
//
// Created by Theodore Dubois on 9/23/18.
//
#import "ArrowBarButton.h"
@interface ArrowBarButton () <CALayerDelegate> {
CALayer *arrowLayers[5];
}
@property CGPoint startPoint;
@property (nonatomic) ArrowDirection direction;
@property BOOL accessibilityUpDown;
@property NSTimer *timer;
@end
@implementation ArrowBarButton
- (instancetype)initWithFrame:(CGRect)frame {
if (self = [super initWithFrame:frame]) {
[self setup];
}
return self;
}
- (instancetype)initWithCoder:(NSCoder *)aDecoder {
if (self = [super initWithCoder:aDecoder]) {
[self setup];
}
return self;
}
static CGPoint anchors[] = {
{},
{.5, .95}, // ArrowUp
{.5, .05}, // ArrowDown
{1.05, .5}, // ArrowLeft
{-.05, .5}, // ArrowRight
};
- (void)setup {
self.layer.delegate = self;
[self addTextLayer:@"↑" direction:ArrowUp];
[self addTextLayer:@"↓" direction:ArrowDown];
[self addTextLayer:@"←" direction:ArrowLeft];
[self addTextLayer:@"→" direction:ArrowRight];
[self layoutSublayersOfLayer:self.layer];
self.layer.cornerRadius = 5;
self.layer.shadowOffset = CGSizeMake(0, 1);
self.layer.shadowOpacity = 0.4;
self.layer.shadowRadius = 0;
self.accessibilityUpDown = YES;
}
- (BOOL)isAccessibilityElement {
return YES;
}
- (UIAccessibilityTraits)accessibilityTraits {
return UIAccessibilityTraitAdjustable;
}
- (NSString *)accessibilityLabel {
return self.accessibilityUpDown ? @"Arrow Keys Up or Down" : @"Arrow Keys Left or Right";
}
- (NSString *)accessibilityHint {
return @"Double tap to toggle direction";
}
- (BOOL)accessibilityActivate {
self.accessibilityUpDown = !self.accessibilityUpDown;
return TRUE;
}
- (void)accessibilityIncrement {
if (self.accessibilityUpDown)
self.direction = ArrowUp;
else
self.direction = ArrowLeft; // this might be wrong in RTL
self.direction = ArrowNone;
}
- (void)accessibilityDecrement {
if (self.accessibilityUpDown)
self.direction = ArrowDown;
else
self.direction = ArrowRight;
self.direction = ArrowNone;
}
- (void)addTextLayer:(NSString *)text direction:(ArrowDirection)direction {
CATextLayer *layer = [CATextLayer new];
layer.contentsScale = UIScreen.mainScreen.scale;
layer.string = text;
layer.fontSize = 15;
UIFont *font = [UIFont systemFontOfSize:layer.fontSize];
layer.font = (__bridge CFTypeRef _Nullable) font;
CGSize textSize = [[NSAttributedString alloc] initWithString:text attributes:@{NSFontAttributeName: font}].size;
layer.bounds = CGRectMake(0, 0, textSize.width, textSize.height);
layer.foregroundColor = UIColor.blackColor.CGColor;
layer.alignmentMode = kCAAlignmentCenter;
layer.anchorPoint = anchors[direction];
[self.layer addSublayer:layer];
self->arrowLayers[direction] = layer;
}
- (void)layoutSublayersOfLayer:(CALayer *)superlayer {
NSParameterAssert(superlayer == self.layer);
for (CALayer *layer in superlayer.sublayers) {
layer.position = CGPointMake(self.bounds.size.width / 2, self.bounds.size.height / 2);
}
}
- (BOOL)beginTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event {
[super beginTrackingWithTouch:touch withEvent:event];
self.startPoint = [touch locationInView:self];
self.selected = YES;
return YES;
}
- (BOOL)continueTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event {
[super continueTrackingWithTouch:touch withEvent:event];
CGPoint currentPoint = [touch locationInView:self];
CGPoint diff = CGPointMake(currentPoint.x - self.startPoint.x, currentPoint.y - self.startPoint.y);
if (hypot(diff.x, diff.y) < 20) {
self.direction = ArrowNone;
} else if (fabs(diff.x) > fabs(diff.y)) {
// more to the side
if (diff.x > 0)
self.direction = ArrowRight;
else
self.direction = ArrowLeft;
} else {
// more up and down
if (diff.y > 0)
self.direction = ArrowDown;
else
self.direction = ArrowUp;
}
return YES;
}
- (void)endTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event {
[super endTrackingWithTouch:touch withEvent:event];
self.selected = NO;
self.direction = ArrowNone;
}
- (void)cancelTrackingWithEvent:(UIEvent *)event {
[super cancelTrackingWithEvent:event];
self.selected = NO;
self.direction = ArrowNone;
}
- (void)animateLayerUpdates {
[UIView animateWithDuration:0.25 animations:^{
for (int d = ArrowUp; d <= ArrowRight; d++) {
CATextLayer *layer = (CATextLayer *) self->arrowLayers[d];
if (self.direction == ArrowNone || self.direction != d) {
layer.opacity = self.selected ? 0.25 : 1;
} else {
layer.opacity = 1;
}
}
}];
}
- (void)setDirection:(ArrowDirection)direction {
ArrowDirection oldDirection = _direction;
_direction = direction;
if (direction != oldDirection) {
[self animateLayerUpdates];
[self.timer invalidate];
if (direction != ArrowNone) {
[self sendActionsForControlEvents:UIControlEventValueChanged];
self.timer = [NSTimer scheduledTimerWithTimeInterval:0.5 repeats:NO block:^(NSTimer *timer) {
[self sendActionsForControlEvents:UIControlEventValueChanged];
self.timer = [NSTimer scheduledTimerWithTimeInterval:0.1 repeats:YES block:^(NSTimer *timer) {
[self sendActionsForControlEvents:UIControlEventValueChanged];
}];
}];
}
}
}
- (UIColor *)textColor {
if (self.keyAppearance == UIKeyboardAppearanceLight)
return UIColor.blackColor;
else
return UIColor.whiteColor;
}
// copy pasted code :dab:
- (UIColor *)defaultColor {
if (self.keyAppearance == UIKeyboardAppearanceLight)
return UIColor.whiteColor;
else
return [UIColor colorWithRed:1 green:1 blue:1 alpha:77/255.];
}
- (UIColor *)highlightedColor {
if (self.keyAppearance == UIKeyboardAppearanceLight)
return [UIColor colorWithRed:172/255. green:180/255. blue:190/255. alpha:1];
else
return [UIColor colorWithRed:147/255. green:147/255. blue:147/255. alpha:66/255.];
}
- (void)setColors {
if (self.selected) {
self.backgroundColor = self.highlightedColor;
} else {
[UIView animateWithDuration:0 delay:0.1 options:UIViewAnimationOptionAllowUserInteraction animations:^{
self.backgroundColor = self.defaultColor;
} completion:nil];
}
for (int d = ArrowUp; d <= ArrowRight; d++) {
CATextLayer *layer = (CATextLayer *) arrowLayers[d];
if (self.keyAppearance == UIKeyboardAppearanceLight)
layer.foregroundColor = UIColor.blackColor.CGColor;
else
layer.foregroundColor = UIColor.whiteColor.CGColor;
}
[self animateLayerUpdates];
}
- (void)setSelected:(BOOL)selected {
[super setSelected:selected];
[self setColors];
}
- (void)setKeyAppearance:(UIKeyboardAppearance)keyAppearance {
_keyAppearance = keyAppearance;
[self setColors];
}
@end