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Pods/ZLPhotoBrowser/Sources/Edit/ZLAdjustSlider.swift

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+//
+//  ZLAdjustSlider.swift
+//  ZLPhotoBrowser
+//
+//  Created by long on 2021/12/17.
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+import UIKit
+
+class ZLAdjustSlider: UIView {
+    static let maximumValue: Float = 1
+    
+    static let minimumValue: Float = -1
+    
+    let sliderWidth: CGFloat = 5
+    
+    lazy var valueLabel: UILabel = {
+        let label = UILabel()
+        label.font = UIFont.systemFont(ofSize: 12)
+        label.layer.shadowColor = UIColor.black.withAlphaComponent(0.6).cgColor
+        label.layer.shadowOffset = .zero
+        label.layer.shadowOpacity = 1
+        label.textColor = .white
+        label.textAlignment = ZLPhotoUIConfiguration.default().adjustSliderType == .vertical ? .right : .center
+        label.adjustsFontSizeToFitWidth = true
+        label.minimumScaleFactor = 0.6
+        return label
+    }()
+    
+    lazy var separator: UIView = {
+        let view = UIView()
+        view.backgroundColor = .zl.rgba(230, 230, 230)
+        return view
+    }()
+    
+    lazy var shadowView: UIView = {
+        let view = UIView()
+        view.backgroundColor = .zl.adjustSliderNormalColor
+        view.layer.cornerRadius = sliderWidth / 2
+        view.layer.shadowColor = UIColor.black.withAlphaComponent(0.4).cgColor
+        view.layer.shadowOffset = .zero
+        view.layer.shadowOpacity = 1
+        view.layer.shadowRadius = 3
+        return view
+    }()
+    
+    lazy var whiteView: UIView = {
+        let view = UIView()
+        view.backgroundColor = .zl.adjustSliderNormalColor
+        view.layer.cornerRadius = sliderWidth / 2
+        view.layer.masksToBounds = true
+        return view
+    }()
+    
+    lazy var tintView: UIView = {
+        let view = UIView()
+        view.backgroundColor = .zl.adjustSliderTintColor
+        return view
+    }()
+    
+    lazy var pan = UIPanGestureRecognizer(target: self, action: #selector(panAction(_:)))
+    
+    private var impactFeedback: UIImpactFeedbackGenerator?
+    
+    private var valueForPanBegan: Float = 0
+    
+    var value: Float = 0 {
+        didSet {
+            valueLabel.text = String(Int(roundf(value * 100)))
+            tintView.frame = calculateTintFrame()
+        }
+    }
+    
+    private var isVertical = ZLPhotoUIConfiguration.default().adjustSliderType == .vertical
+    
+    var beginAdjust: (() -> Void)?
+    
+    var valueChanged: ((Float) -> Void)?
+    
+    var endAdjust: (() -> Void)?
+    
+    deinit {
+        zl_debugPrint("ZLAdjustSlider deinit")
+    }
+    
+    override init(frame: CGRect) {
+        super.init(frame: frame)
+        setupUI()
+        
+        let editConfig = ZLPhotoConfiguration.default().editImageConfiguration
+        if editConfig.impactFeedbackWhenAdjustSliderValueIsZero {
+            impactFeedback = UIImpactFeedbackGenerator(style: editConfig.impactFeedbackStyle)
+        }
+        
+        addGestureRecognizer(pan)
+    }
+    
+    @available(*, unavailable)
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    override func layoutSubviews() {
+        super.layoutSubviews()
+        
+        if isVertical {
+            shadowView.frame = CGRect(x: 40, y: 0, width: sliderWidth, height: bounds.height)
+            whiteView.frame = shadowView.frame
+            tintView.frame = calculateTintFrame()
+            let separatorH: CGFloat = 1
+            separator.frame = CGRect(x: 0, y: (bounds.height - separatorH) / 2, width: sliderWidth, height: separatorH)
+            valueLabel.frame = CGRect(x: 0, y: bounds.height / 2 - 10, width: 38, height: 20)
+        } else {
+            valueLabel.frame = CGRect(x: 0, y: 0, width: zl.width, height: 38)
+            shadowView.frame = CGRect(x: 0, y: valueLabel.zl.bottom + 2, width: zl.width, height: sliderWidth)
+            whiteView.frame = shadowView.frame
+            tintView.frame = calculateTintFrame()
+            let separatorW: CGFloat = 1
+            separator.frame = CGRect(x: (zl.width - separatorW) / 2, y: 0, width: separatorW, height: sliderWidth)
+        }
+    }
+    
+    private func setupUI() {
+        addSubview(shadowView)
+        addSubview(whiteView)
+        whiteView.addSubview(tintView)
+        whiteView.addSubview(separator)
+        addSubview(valueLabel)
+    }
+    
+    private func calculateTintFrame() -> CGRect {
+        if isVertical {
+            let totalH = zl.height / 2
+            let tintH = totalH * abs(CGFloat(value)) / CGFloat(ZLAdjustSlider.maximumValue)
+            if value > 0 {
+                return CGRect(x: 0, y: totalH - tintH, width: sliderWidth, height: tintH)
+            } else {
+                return CGRect(x: 0, y: totalH, width: sliderWidth, height: tintH)
+            }
+        } else {
+            let totalW = zl.width / 2
+            let tintW = totalW * abs(CGFloat(value)) / CGFloat(ZLAdjustSlider.maximumValue)
+            if value > 0 {
+                return CGRect(x: totalW, y: 0, width: tintW, height: sliderWidth)
+            } else {
+                return CGRect(x: totalW - tintW, y: 0, width: tintW, height: sliderWidth)
+            }
+        }
+    }
+    
+    @objc private func panAction(_ pan: UIPanGestureRecognizer) {
+        let translation = pan.translation(in: self)
+        
+        if pan.state == .began {
+            valueForPanBegan = value
+            beginAdjust?()
+            impactFeedback?.prepare()
+        } else if pan.state == .changed {
+            let transValue = isVertical ? -translation.y : translation.x
+            let totalLength = isVertical ? zl.height / 2 : zl.width / 2
+            var temp = valueForPanBegan + Float(transValue / totalLength)
+            temp = max(ZLAdjustSlider.minimumValue, min(ZLAdjustSlider.maximumValue, temp))
+            
+            if (-0.0049..<0.005) ~= temp {
+                temp = 0
+            }
+            
+            guard value != temp else { return }
+            
+            value = temp
+            valueChanged?(value)
+            
+            guard #available(iOS 10.0, *) else { return }
+            if value == 0 {
+                impactFeedback?.impactOccurred()
+            }
+        } else {
+            valueForPanBegan = value
+            endAdjust?()
+        }
+    }
+}