NetNewsWire/Multiplatform/iOS/Article/IconView.swift

128 lines
3.0 KiB
Swift

//
// IconView.swift
// Multiplatform iOS
//
// Created by Maurice Parker on 7/6/20.
// Copyright © 2020 Ranchero Software. All rights reserved.
//
import UIKit
final class IconView: UIView {
var iconImage: IconImage? = nil {
didSet {
if iconImage !== oldValue {
imageView.image = iconImage?.image
if self.traitCollection.userInterfaceStyle == .dark {
if self.iconImage?.isDark ?? false {
self.isDiscernable = false
self.setNeedsLayout()
} else {
self.isDiscernable = true
self.setNeedsLayout()
}
} else {
if self.iconImage?.isBright ?? false {
self.isDiscernable = false
self.setNeedsLayout()
} else {
self.isDiscernable = true
self.setNeedsLayout()
}
}
self.setNeedsLayout()
}
}
}
private var isDiscernable = true
private let imageView: UIImageView = {
let imageView = UIImageView(image: AppAssets.faviconTemplateImage)
imageView.contentMode = .scaleAspectFit
imageView.clipsToBounds = true
imageView.layer.cornerRadius = 4.0
return imageView
}()
private var isVerticalBackgroundExposed: Bool {
return imageView.frame.size.height < bounds.size.height
}
private var isSymbolImage: Bool {
return iconImage?.isSymbol ?? false
}
private var isBackgroundSuppressed: Bool {
return iconImage?.isBackgroundSupressed ?? false
}
override init(frame: CGRect) {
super.init(frame: frame)
commonInit()
}
required init?(coder: NSCoder) {
super.init(coder: coder)
commonInit()
}
convenience init() {
self.init(frame: .zero)
}
override func didMoveToSuperview() {
setNeedsLayout()
}
override func layoutSubviews() {
imageView.setFrameIfNotEqual(rectForImageView())
if (iconImage != nil && isVerticalBackgroundExposed) || !isDiscernable {
backgroundColor = AppAssets.uiIconBackgroundColor
} else {
backgroundColor = nil
}
}
}
private extension IconView {
func commonInit() {
layer.cornerRadius = 4
clipsToBounds = true
addSubview(imageView)
}
func rectForImageView() -> CGRect {
guard let image = iconImage?.image else {
return CGRect.zero
}
let imageSize = image.size
let viewSize = bounds.size
if imageSize.height == imageSize.width {
if imageSize.height >= viewSize.height {
return CGRect(x: 0.0, y: 0.0, width: viewSize.width, height: viewSize.height)
}
let offset = floor((viewSize.height - imageSize.height) / 2.0)
return CGRect(x: offset, y: offset, width: imageSize.width, height: imageSize.height)
}
else if imageSize.height > imageSize.width {
let factor = viewSize.height / imageSize.height
let width = imageSize.width * factor
let originX = floor((viewSize.width - width) / 2.0)
return CGRect(x: originX, y: 0.0, width: width, height: viewSize.height)
}
// Wider than tall: imageSize.width > imageSize.height
let factor = viewSize.width / imageSize.width
let height = imageSize.height * factor
let originY = floor((viewSize.height - height) / 2.0)
return CGRect(x: 0.0, y: originY, width: viewSize.width, height: height)
}
}