kmpdfkit_demo/PDFViewer/Source/PDFKeyboardToolbar/PDFKTSlideView.m

//
//  PDFKTslideSizeView.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 "PDFKTSlideView.h"

@implementation PDFKTSlideView
{
    UIView *_valueView;
    UILabel *_valueLabel;
    UILabel *_valueLabelonView;
    CGFloat _beginValue;
    UIImageView *_backView;
    CGFloat _valueViewWidth;
}
@synthesize slideDelegate = _slideDelegate;
@synthesize curValue = _curValue;
- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
        UIImage *backImg = [UIImage imageNamed:@"size_bar.png"];
        _backView = [[UIImageView alloc]initWithImage:backImg];
        _backView.frame = CGRectMake(0, -70, backImg.size.width, backImg.size.height);
        CGPoint backViewCenter = _backView.center;
        backViewCenter.x = self.bounds.size.width / 2;
        _backView.center = backViewCenter;
//        _backView.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin |UIViewAutoresizingFlexibleRightMargin;
        [self addSubview:_backView];
//        _backView.hidden = YES;
        
        _valueLabel = [[UILabel alloc] initWithFrame:CGRectMake(0,0,56,42)];
        _valueLabel.textAlignment = NSTextAlignmentCenter;
        _valueLabel.backgroundColor = [UIColor clearColor];
        _valueLabel.text = @"1";
        _valueLabel.center = CGPointMake(_backView.bounds.size.width - _valueLabel.bounds.size.width / 2, _valueLabel.center.y);
        [_backView addSubview:_valueLabel];
        
        UIImage *sizeImg = [UIImage imageNamed:@"size_scale.png"];
        UIImageView *sizeBack = [[UIImageView alloc] initWithImage:sizeImg];
        sizeBack.frame = CGRectMake(0, 0, sizeImg.size.width, sizeImg.size.height);
        _valueView = [[UIView alloc] initWithFrame:CGRectMake(7, 5, sizeImg.size.width, sizeImg.size.height)];
        [_valueView addSubview:sizeBack];
        _valueView.clipsToBounds = YES;
        [sizeBack release];
        _valueViewWidth = sizeImg.size.width;
        [_backView addSubview:_valueView];
        _backView.hidden =YES;
        
        _valueLabelonView = [[UILabel alloc] initWithFrame:self.bounds];
        _valueLabelonView.textAlignment = NSTextAlignmentCenter;
        _valueLabelonView.text = @"1";
        _valueLabelonView.textColor = [UIColor whiteColor];
        _valueLabelonView.backgroundColor = [UIColor clearColor];
        [self addSubview:_valueLabelonView];
        _minValue = 1;
        _maxValue = 99;
    }
    return self;
}
- (void)layoutSubviews{
    [super layoutSubviews];
    CGPoint center = _backView.center;
    center.x = self.frame.size.width/2.0;
    _backView.center = center;
}
- (void)dealloc
{
    [_valueView release];
    [_valueLabel release];
    [_backView release];
    [_valueLabelonView release];
    _slideDelegate = nil;
    [super dealloc];
}
- (void)setCurValue:(CGFloat)curValue
{
    _curValue = curValue;
    _valueLabelonView.text = [NSString stringWithFormat:@"%.f",curValue];
    _valueLabel.text = [NSString stringWithFormat:@"%.f",curValue];
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
	CGPoint location = [touch locationInView:self];
    _beginValue = location.x;
    int curValue = [_valueLabel.text intValue];
    if (curValue > _maxValue) curValue = _maxValue;
    if (curValue < _minValue) curValue = _minValue;
    CGRect frame = _valueView.frame;
    frame.size.width = _valueViewWidth * (curValue - _minValue + 1)  / (_maxValue - _minValue +1);
    [_valueView setFrame:frame];
    _backView.hidden = NO;
    [self.slideDelegate slideDidBegin:self];
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    // 检查point是否改变
    CGPoint cPoint = [[touches anyObject] locationInView:self];
    CGPoint pPoint = [[touches anyObject] previousLocationInView:self];
    if (CGPointEqualToPoint(cPoint, pPoint)) {
        return;
    }
    if (fabs(cPoint.x - pPoint.x) < 0.5) {
        return;
    }
    
    UITouch *touch = [touches anyObject];
	CGPoint location = [touch locationInView:self];
    int curValue = [_valueLabel.text intValue];
    if (location.x > _beginValue) curValue++;
    else curValue --;
    if (curValue > _maxValue) curValue = _maxValue;
    if (curValue < _minValue) curValue = _minValue;
    _beginValue = location.x;
    _valueLabel.text = [NSString stringWithFormat:@"%d",curValue];
    _valueLabelonView.text = [NSString stringWithFormat:@"%d",curValue];
    CGRect frame = _valueView.frame;
    frame.size.width = _valueViewWidth * (curValue - _minValue + 1) / (_maxValue - _minValue +1);
    [_valueView setFrame:frame];
    _backView.hidden = NO;
    if (_slideDelegate && [_slideDelegate respondsToSelector:@selector(slideView:updateValue:)])
        [_slideDelegate slideView:self updateValue:[_valueLabel.text floatValue]];
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
	CGPoint location = [touch locationInView:self];
    _beginValue = location.x;
    _backView.hidden = YES;
    [self.slideDelegate slideDidEnd:self];
}

- (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    [self touchesEnded:touches withEvent:event];
}
@end