xiaobawang/tongxin/ThirdPartyLib/MessageDisplayKit/Classes/Vendor/XHPathCover/XHWaterDropRefresh.m

//
//  XHWaterDropRefresh.m
//  XHPathCover
//
//  Created by 曾 宪华 on 14-2-7.
//  Copyright (c) 2014年 曾宪华 开发团队(http://iyilunba.com ) 本人QQ:543413507 本人QQ群（142557668）. All rights reserved.
//

#import "XHWaterDropRefresh.h"
#import "XHSoundManager.h"

@interface XHWaterDropRefresh ()<CAAnimationDelegate> {
    BOOL _isRefresh;
}

@property (nonatomic, strong) CAShapeLayer *shapeLayer;
@property (nonatomic, strong) CAShapeLayer *lineLayer;
@property (nonatomic, strong) UIImageView *refreshView;


@property (nonatomic, strong) NSTimer *timer;

@end

@implementation XHWaterDropRefresh

#pragma mark - Propertys

- (BOOL)isRefreshing {
    return _isRefresh;
}


#pragma mark - Life cycle

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
        [self _setup];
    }
    return self;
}

- (id)initWithCoder:(NSCoder *)aDecoder
{
    self = [super initWithCoder:aDecoder];
    if(self)
    {
        [self _setup];
    }
    return self;
}

- (void)dealloc {
    self.refreshCircleImage = nil;
    
    self.shapeLayer = nil;
    self.lineLayer = nil;
    self.refreshView = nil;
}

- (void)_setup {
    self.deformationLength = 0.4;
    self.maxOffset = 70; // 改变最大拉断距离
    self.radius = 5.; // 改变圆圈的半径
    self.offsetHeight = 20; // 改变线条的长度
    
    CGRect frame = self.frame;
    frame.size = CGSizeMake(30, 100);  //固定 30 * 100 为什么要固定本身的大小呢？
    self.frame = frame;
    
    _lineLayer = [CAShapeLayer layer];
    _lineLayer.fillColor = [UIColor colorWithRed:222./255. green:216./255. blue:211./255. alpha:0.5].CGColor;
    [self.layer addSublayer:_lineLayer];
    
    
    _shapeLayer = [CAShapeLayer layer];
    _shapeLayer.fillColor = [UIColor colorWithRed:222./255. green:216./255. blue:211./255. alpha:1].CGColor;
    _shapeLayer.strokeColor = [[UIColor whiteColor] CGColor];
    _shapeLayer.lineWidth = 2;
    [self.layer addSublayer:_shapeLayer];
    
    self.currentOffset = 0;
}

#pragma mark - Publish Api

- (void)stopRefresh {
    _isRefresh = NO;
    
    CABasicAnimation* anim = [CABasicAnimation animationWithKeyPath:@"opacity"];
    anim.fromValue = @(1);
    anim.toValue = @(0);
    anim.duration = 0.2;
    anim.delegate = self;
    [_refreshView.layer addAnimation:anim forKey:nil];
    _refreshView.layer.opacity = 0;
    
    
    anim = [CABasicAnimation animationWithKeyPath:@"opacity"];
    anim.fromValue = @(0);
    anim.toValue = @(1);
    anim.beginTime = 0.2;
    anim.duration = 0.2;
    anim.delegate = self;
    [_shapeLayer addAnimation:anim forKey:nil];
    _shapeLayer.opacity = 0;
}


- (void)startRefreshAnimation {
    if(self.refreshView == nil) {
        _refreshView = [[UIImageView alloc] initWithImage:self.refreshCircleImage];
        CGRect refreshViewFrame = _refreshView.frame;
        refreshViewFrame.size = CGSizeMake(18, 18);
        [self addSubview:_refreshView];
    }
    _shapeLayer.opacity = 0;
    
    _refreshView.center = CGPointMake(15,self.frame.size.height - 20 - _radius);
    [_refreshView.layer removeAllAnimations];
    _refreshView.layer.opacity = 1;
    
    CABasicAnimation* animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
    animation.duration = 1;
    animation.fromValue = @0;
    animation.toValue = @(M_PI*2);
    animation.repeatCount = INT_MAX;
    
    [_refreshView.layer addAnimation:animation forKey:@"rotation"];
}

#pragma mark - CGMutablePathRef Help Method

- (CGMutablePathRef)createPathWithOffset:(float)currentOffset {
    CGMutablePathRef path = CGPathCreateMutable();
    float top = self.frame.size.height - 20 - _radius*2 - currentOffset;
    float wdiff = currentOffset * self.deformationLength; // 改变拉断之前，水滴的长度
    
    if(currentOffset == 0) {
        CGPathAddEllipseInRect(path, NULL, CGRectMake(15-_radius, top, _radius*2, _radius*2));
    } else {
        CGPathAddArc(path, NULL, 15, top+_radius, _radius, 0, M_PI, YES);
        float bottom = top + wdiff+_radius*2;
        if(currentOffset < 10) {
            CGPathAddCurveToPoint(path, NULL,15-_radius,bottom,15,bottom, 15,bottom);
            CGPathAddCurveToPoint(path, NULL, 15,bottom,15+_radius,bottom, 15+_radius, top+_radius);
        } else {
            CGPathAddCurveToPoint(path, NULL,15-_radius ,top +_radius, 15 - _radius ,bottom - _radius, 15, bottom);
            CGPathAddCurveToPoint(path,NULL, 15 + _radius, bottom - _radius, 15+_radius,top +_radius , 15+_radius, top+_radius);
        }
    }
    CGPathCloseSubpath(path);
    
    return path;
}

- (void)setCurrentOffset:(float)currentOffset {
    if(_isRefresh)
        return;
    
    [self privateSetCurrentOffset:currentOffset];
}

- (void)privateSetCurrentOffset:(float)currentOffset {
    currentOffset = currentOffset>0?0:currentOffset;
    currentOffset = -currentOffset;
    _currentOffset =  currentOffset;
    if(currentOffset < _maxOffset) {
        float wdiff = currentOffset* 0.2;
        float top = self.frame.size.height - 20 - _radius*2 - currentOffset;
        
        CGMutablePathRef path = [self createPathWithOffset:currentOffset];
        _shapeLayer.path = path;
        CGPathRelease(path);
        
        
        CGMutablePathRef line = CGPathCreateMutable();
        float w = ((_maxOffset - currentOffset)/_maxOffset) + 1;
        CGPathAddRect(line, NULL, CGRectMake(15-w/2, top + wdiff + _radius*2,w, currentOffset-wdiff + self.offsetHeight)); // 最好的+20就是线条的长度
        _lineLayer.path = line;
        
        self.transform = CGAffineTransformMakeScale(0.8+0.2*(w-1), 1);
    } else {
        if(self.timer == nil)
        {
            _isRefresh = YES;
            self.transform = CGAffineTransformIdentity;
            self.timer = [NSTimer timerWithTimeInterval:0.02 target:self selector:@selector(resetWater) userInfo:nil repeats:YES];
            [[NSRunLoop mainRunLoop] addTimer:_timer forMode:NSRunLoopCommonModes];
            [_timer fire];
        }
    }
}

- (void)resetWater {
    [self privateSetCurrentOffset:-(_currentOffset-(_maxOffset/8))];
    if(_currentOffset == 0) {
        [self.timer invalidate];
        self.timer = nil;
        
        // play refresh stop sound
        [[XHSoundManager sharedInstance] playRefreshSound];
        
        if(self.handleRefreshEvent != nil) {
            self.handleRefreshEvent();
        }
        [self startRefreshAnimation];
    }
}


- (void)animationDidStop:(CABasicAnimation *)anim finished:(BOOL)flag {
    if(anim.beginTime > 0) {
        _shapeLayer.opacity = 1;
    } else {
        [_refreshView.layer removeAllAnimations];
    }
}

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

@end