iOS/Pods/FolioReaderKit/Vendor/SMSegmentView/SMSegment.swift

   1 //
   2 //  SMSegment.swift
   3 //
   4 //  Created by Si MA on 03/01/2015.
   5 //  Copyright (c) 2015 Si Ma. All rights reserved.
   6 //
   7
   8 import UIKit
   9
  10 protocol SMSegmentDelegate: class {
  11     func selectSegment(_ segment: SMSegment)
  12 }
  13
  14 class SMSegment: UIView {
  15
  16     weak var delegate: SMSegmentDelegate?
  17
  18     fileprivate(set) var isSelected: Bool = false
  19     fileprivate var shouldResponse: Bool!
  20     var index: Int = 0
  21     var verticalMargin: CGFloat = 5.0 {
  22         didSet {
  23             self.resetContentFrame()
  24         }
  25     }
  26
  27     var separatorWidth: CGFloat
  28
  29     // Segment Colour
  30     var onSelectionColour: UIColor = UIColor.darkGray {
  31         didSet {
  32             if self.isSelected == true {
  33                 self.backgroundColor = self.onSelectionColour
  34             }
  35         }
  36     }
  37     var offSelectionColour: UIColor = UIColor.white {
  38         didSet {
  39             if self.isSelected == false {
  40                 self.backgroundColor = self.offSelectionColour
  41             }
  42         }
  43     }
  44     fileprivate var willOnSelectionColour: UIColor! {
  45         get {
  46             var hue: CGFloat = 0.0
  47             var saturation: CGFloat = 0.0
  48             var brightness: CGFloat = 0.0
  49             var alpha: CGFloat = 0.0
  50             self.onSelectionColour.getHue(&hue, saturation: &saturation, brightness: &brightness, alpha: &alpha)
  51             return UIColor(hue: hue, saturation: saturation*0.5, brightness: min(brightness*1.5, 1.0), alpha: alpha)
  52         }
  53     }
  54
  55     // Segment Title Text & Colour & Font
  56     var title: String? {
  57         didSet {
  58             self.label.text = self.title
  59
  60             if let titleText = self.label.text as NSString? {
  61                 self.labelWidth = titleText.boundingRect(with: CGSize(width: self.frame.size.width, height: self.frame.size.height), options:NSStringDrawingOptions.usesLineFragmentOrigin , attributes: [NSAttributedStringKey.font: self.label.font], context: nil).size.width
  62             }
  63             else {
  64                 self.labelWidth = 0.0
  65             }
  66
  67             self.resetContentFrame()
  68         }
  69     }
  70     var onSelectionTextColour: UIColor = UIColor.white {
  71         didSet {
  72             if self.isSelected == true {
  73                 self.label.textColor = self.onSelectionTextColour
  74             }
  75         }
  76     }
  77     var offSelectionTextColour: UIColor = UIColor.darkGray {
  78         didSet {
  79             if self.isSelected == false {
  80                 self.label.textColor = self.offSelectionTextColour
  81             }
  82         }
  83     }
  84     var titleFont: UIFont = UIFont.systemFont(ofSize: 17.0) {
  85         didSet {
  86             self.label.font = self.titleFont
  87
  88             if let titleText = self.label.text as NSString? {
  89                 self.labelWidth = titleText.boundingRect(with: CGSize(width: self.frame.size.width + 1.0, height: self.frame.size.height), options:NSStringDrawingOptions.usesLineFragmentOrigin , attributes: [NSAttributedStringKey.font: self.label.font], context: nil).size.width
  90             }
  91             else {
  92                 self.labelWidth = 0.0
  93             }
  94
  95             self.resetContentFrame()
  96         }
  97     }
  98
  99     // Segment Image
 100     var onSelectionImage: UIImage? {
 101         didSet {
 102             if self.onSelectionImage != nil {
 103                 self.resetContentFrame()
 104             }
 105             if self.isSelected == true {
 106                 self.imageView.image = self.onSelectionImage
 107                 self.imageView.contentMode = .center
 108             }
 109         }
 110     }
 111     var offSelectionImage: UIImage? {
 112         didSet {
 113             if self.offSelectionImage != nil {
 114                 self.resetContentFrame()
 115             }
 116             if self.isSelected == false {
 117                 self.imageView.image = self.offSelectionImage
 118                 self.imageView.contentMode = .center
 119             }
 120         }
 121     }
 122
 123     // UI Elements
 124     override var frame: CGRect {
 125         didSet {
 126             self.resetContentFrame()
 127         }
 128     }
 129     fileprivate var imageView: UIImageView = UIImageView()
 130     fileprivate var label: UILabel = UILabel()
 131     fileprivate var labelWidth: CGFloat = 0.0
 132
 133     required init?(coder aDecoder: NSCoder) {
 134         fatalError("init(coder:) has not been implemented")
 135     }
 136
 137     init(separatorWidth: CGFloat, verticalMargin: CGFloat, onSelectionColour: UIColor, offSelectionColour: UIColor, onSelectionTextColour: UIColor, offSelectionTextColour: UIColor, titleFont: UIFont) {
 138
 139         self.separatorWidth = separatorWidth
 140         self.verticalMargin = verticalMargin
 141         self.onSelectionColour = onSelectionColour
 142         self.offSelectionColour = offSelectionColour
 143         self.onSelectionTextColour = onSelectionTextColour
 144         self.offSelectionTextColour = offSelectionTextColour
 145         self.titleFont = titleFont
 146
 147         super.init(frame: CGRect.zero)
 148         self.setupUIElements()
 149     }
 150
 151     func setupUIElements() {
 152
 153         self.backgroundColor = self.offSelectionColour
 154
 155         self.imageView.contentMode = UIViewContentMode.scaleAspectFit
 156         self.addSubview(self.imageView)
 157
 158         self.label.textAlignment = NSTextAlignment.center
 159         self.label.font = self.titleFont
 160         self.label.textColor = self.offSelectionTextColour
 161         self.addSubview(self.label)
 162     }
 163
 164     // MARK: Selections
 165     func setSelected(_ selected: Bool) {
 166         if selected == true {
 167             self.isSelected = true
 168             self.backgroundColor = self.onSelectionColour
 169             self.label.textColor = self.onSelectionTextColour
 170             self.imageView.image = self.onSelectionImage
 171         }
 172         else {
 173             self.isSelected = false
 174             self.backgroundColor = self.offSelectionColour
 175             self.label.textColor = self.offSelectionTextColour
 176             self.imageView.image = self.offSelectionImage
 177         }
 178     }
 179
 180     // MARK: Update Frame
 181     fileprivate func resetContentFrame() {
 182
 183         var distanceBetween: CGFloat = 0.0
 184         var imageViewFrame = CGRect(x: 0.0, y: self.verticalMargin, width: 0.0, height: self.frame.size.height - self.verticalMargin*2)
 185
 186         if self.onSelectionImage != nil || self.offSelectionImage != nil {
 187             // Set imageView as a square
 188             imageViewFrame.size.width = self.frame.size.height - self.verticalMargin*2
 189             distanceBetween = 5.0
 190         }
 191
 192         // If there's no text, align imageView centred
 193         // Else align text centred
 194         if self.labelWidth == 0.0 {
 195             imageViewFrame.origin.x = max((self.frame.size.width - imageViewFrame.size.width) / 2.0, 0.0)
 196         }
 197         else {
 198             imageViewFrame.origin.x = max((self.frame.size.width - imageViewFrame.size.width - self.labelWidth) / 2.0 - distanceBetween, 0.0)
 199         }
 200
 201         self.imageView.frame = imageViewFrame
 202
 203         self.label.frame = CGRect(x: imageViewFrame.origin.x + imageViewFrame.size.width + distanceBetween, y: self.verticalMargin, width: self.labelWidth, height: self.frame.size.height - self.verticalMargin * 2)
 204     }
 205
 206     // MARK: Handle touch
 207     override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
 208         super.touchesBegan(touches, with: event)
 209
 210         if self.isSelected == false {
 211             self.shouldResponse = true
 212             self.backgroundColor = self.willOnSelectionColour
 213         }
 214     }
 215
 216     override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
 217         super.touchesEnded(touches, with: event)
 218
 219         self.delegate?.selectSegment(self)
 220     }
 221 }