Kulexiu/KulexiuForStudent/KulexiuForStudent/Module/Mine/Works/View/KSVideoImageSlider.m

//
//  KSVideoImageSlider.m
//  KulexiuSchoolStudent
//
//  Created by 王智 on 2023/11/8.
//

#import "KSVideoImageSlider.h"
#define BOUND(VALUE, UPPER, LOWER)    MIN(MAX(VALUE, LOWER), UPPER)

@interface KSVideoImageSlider ()
{
    UIImageView *_knobView;
    float _knobWidth;
    float _knobHeight;
    float _useableTrackLength;
    CGPoint _previousTouchPoint;
}


@end

@implementation KSVideoImageSlider

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
        _maximumValue = 10.0;
        _minimumValue = 0.0;
        _previousTouchPoint = CGPointMake(0, 0);
       // _knobValue = 0.0;
        [self createLayerView:frame];
        [self createTheknob];
        [self setKnodFrames];
    }
    return self;
}

- (void)createLayerView:(CGRect)frame {
    UIView *layerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, frame.size.width, frame.size.height)];
    layerView.backgroundColor = [UIColor blackColor];
    layerView.alpha = 0.32;
    layerView.userInteractionEnabled = NO;
    [self addSubview:layerView];
}

#pragma mark   --------PublicMethod
-(void)createTheImageWall {
    for (int i=0; i<self.maximumValue; i++) {
        UIImageView * imageView = [[UIImageView alloc]initWithFrame:CGRectMake(i*(self.frame.size.width/self.maximumValue), 2, self.frame.size.width/self.maximumValue, self.frame.size.height-4)];
        UIImage *image = self.imageArray[i];
        [imageView setImage:image];
        [self addSubview:imageView];
        [self sendSubviewToBack:imageView];
    }
}

- (void)updateTheKnobImage:(UIImage*)image{
    [_knobView setImage:image];
}

- (void)moveKnobWithSelectedValue:(float)value{
    [self setKnobValue:value];
    [self setKnodFrames];
}
#pragma mark  --------PrivateMethod
- (void)createTheknob{
    if (_knobView == nil) {
        _knobView = [[UIImageView alloc]init];
        _knobView.layer.cornerRadius = 10.0f;
        _knobView.layer.borderColor = HexRGB(0x279FFE).CGColor;
        _knobView.layer.borderWidth = 4.0f;
        _knobView.layer.masksToBounds = YES;
        _knobView.contentMode = UIViewContentModeScaleAspectFill;
        [self addSubview:_knobView];
        [self bringSubviewToFront:_knobView];
    }
}

- (void) setKnodFrames {
    _knobWidth = self.bounds.size.height / 9 * 16;
    _knobHeight = self.bounds.size.height;
    _useableTrackLength = self.bounds.size.width - _knobWidth;
    
    float knobCentre = [self positionForValue:self.knobValue];
    _knobView.frame = CGRectMake(knobCentre - _knobWidth / 2, 0, _knobWidth, _knobHeight);
}

- (float)positionForValue:(float)value
{
    return _useableTrackLength * (value - _minimumValue) /
    (_maximumValue - _minimumValue) + (_knobWidth / 2);
}
#pragma mark -----------TouchHandle
- (BOOL)beginTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event{
    CGPoint touchPoint = [touch locationInView:self];
    
    // 1. determine by how much the user has dragged
    float delta = touchPoint.x - _previousTouchPoint.x;
    float valueDelta = (_maximumValue - _minimumValue) * delta / _useableTrackLength;
    
    _previousTouchPoint = touchPoint;
    
    _knobValue  += valueDelta;
    _knobValue  = BOUND(_knobValue, _maximumValue, _minimumValue);
    [CATransaction begin];
    [CATransaction setDisableActions:YES] ;
    
    [self setKnodFrames];
    
    [CATransaction commit];
    [self sendActionsForControlEvents:UIControlEventValueChanged];
    return YES;
}
- (BOOL)continueTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event{
    CGPoint touchPoint = [touch locationInView:self];
    
    // 1. determine by how much the user has dragged
    float delta = touchPoint.x - _previousTouchPoint.x;
    float valueDelta = (_maximumValue - _minimumValue) * delta / _useableTrackLength;
    
    _previousTouchPoint = touchPoint;
    
    _knobValue  += valueDelta;
    _knobValue  = BOUND(_knobValue, _maximumValue, _minimumValue);
    [CATransaction begin];
    [CATransaction setDisableActions:YES] ;
    
    [self setKnodFrames];
    
    [CATransaction commit];
    [self sendActionsForControlEvents:UIControlEventValueChanged];
    return YES;
}

- (void)endTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event{
    
}
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code
}
*/

@end