/*

 Copyright (C) 2018 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 Custom `SKNode` based slider.

 */

#import "AAPLSlider.h"

@interface AAPLSlider ()

@property (strong, nonatomic) SKLabelNode *label;

@property (strong, nonatomic) SKShapeNode *slider;

@property (strong, nonatomic) SKSpriteNode *background;

@property (nonatomic, readonly) SEL actionClicked;

@property (nonatomic, readonly, weak) id targetClicked;

@end

@implementation AAPLSlider

@synthesize value = _value;

+ (AAPLSlider*)sliderWithWidth:(int)width height:(int)height text:(NSString*)txt

{

    AAPLSlider *s = [[AAPLSlider alloc] initWithWidth:width height:height text:txt];

    return s;

}

- (id)initWithWidth:(int)width height:(int)height text:(NSString*)txt

{

    if (self = [super init])

    {

        // create a label

        NSString *fontName = @"Optima-ExtraBlack";

        _label = [SKLabelNode labelNodeWithFontNamed:fontName];

        _label.text = txt;

        _label.fontSize = 18;

        _label.fontColor = [SKColor whiteColor];

        _label.position = CGPointMake(0., -8.);

        // create background & slider

        _background = [SKSpriteNode spriteNodeWithColor:[SKColor whiteColor] size:CGSizeMake(width, 2) ];

        _slider = [SKShapeNode shapeNodeWithCircleOfRadius:height];

        _slider.fillColor = [SKColor whiteColor];

        _background.anchorPoint = CGPointMake(0.f, 0.5f);

        _slider.position = CGPointMake(_label.frame.size.width/2 + 15, 0.);

        _background.position = CGPointMake(_label.frame.size.width/2 + 15, 0.);

        // add to the root node

        [self addChild:_label];

        [self addChild:_background];

        [self addChild:_slider];

        // track mouse event

        self.userInteractionEnabled = YES;

        _value = 0.f;

    }

    return self;

}

- (CGFloat) width

{

    return _background.frame.size.width;

}

- (CGFloat) height

{

    return _slider.frame.size.height;

}

- (void)setValue:(CGFloat)value

{

    _value = value;

    _slider.position = CGPointMake( self.background.position.x + _value*self.width, 0.);

}

- (CGFloat) value

{

    return _value;

}

- (void)setBackgroundColor:(SKColor*)col

{

    [_background setColor:col];

}

- (void)setClickedTarget:(id)target action:(SEL)action

{

    assert( target != nil && action != nil );

    _targetClicked = target;

    _actionClicked = action;

    IMP imp = [_targetClicked methodForSelector:action];

    assert( imp != nil );

    _action = (void *)imp;

}

#if TARGET_OS_OSX

- (void)mouseDown:(NSEvent *)event

{

    [self mouseDragged:event];

}

- (void)mouseUp:(NSEvent *)event

{

    [self setBackgroundColor:[SKColor whiteColor]];

}

- (void)mouseDragged:(NSEvent *)event

{

    [self setBackgroundColor:[SKColor grayColor]];

    CGPoint posInView = [self.scene convertPoint:self.position fromNode:self.parent];

    float x = [event locationInWindow].x - posInView.x - self.background.position.x;

    float pos = fmaxf( fminf( x, self.width), 0.f);

    _slider.position = CGPointMake( self.background.position.x + pos, 0.);

    self.value = pos / self.width;

    _action( _targetClicked, _actionClicked );

}

#endif

#if TARGET_OS_IPHONE

- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(nullable UIEvent *)event

{

    [self setBackgroundColor:[SKColor grayColor]];

    float x = [[touches anyObject] locationInNode:self].x - self.background.position.x;

    float pos = fmaxf( fminf( x, self.width), 0.f);

    _slider.position = CGPointMake( self.background.position.x + pos, 0.);

    self.value = pos / self.width;

    _action( _targetClicked, _actionClicked );

}

#endif

@end