NetNewsWire/iOS/IconView.swift

129 lines
3.2 KiB
Swift
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//
// IconView.swift
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// NetNewsWire-iOS
//
// Created by Maurice Parker on 9/17/19.
// Copyright © 2019 Ranchero Software. All rights reserved.
//
import UIKit
final class IconView: UIView {
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var iconImage: IconImage? = nil {
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didSet {
if iconImage !== oldValue {
imageView.image = iconImage?.image
if self.traitCollection.userInterfaceStyle == .dark {
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if self.iconImage?.isDark ?? false {
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self.isDiscernable = false
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self.setNeedsLayout()
} else {
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self.isDiscernable = true
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self.setNeedsLayout()
}
} else {
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if self.iconImage?.isBright ?? false {
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self.isDiscernable = false
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self.setNeedsLayout()
} else {
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self.isDiscernable = true
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self.setNeedsLayout()
}
}
self.setNeedsLayout()
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}
}
}
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private var isDiscernable = true
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private let imageView: UIImageView = {
let imageView = NonIntrinsicImageView(image: AppAssets.faviconTemplateImage)
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imageView.contentMode = .scaleAspectFit
imageView.clipsToBounds = true
imageView.layer.cornerRadius = 2.0
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return imageView
}()
private var isVerticalBackgroundExposed: Bool {
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return imageView.frame.size.height < bounds.size.height
}
private var isSymbolImage: Bool {
return iconImage?.isSymbol ?? false
}
private var isBackgroundSuppressed: Bool {
return iconImage?.isBackgroundSupressed ?? false
}
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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())
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if !isBackgroundSuppressed && ((iconImage != nil && isVerticalBackgroundExposed) || !isDiscernable) {
backgroundColor = AppAssets.iconBackgroundColor
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} else {
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backgroundColor = nil
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}
}
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}
private extension IconView {
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func commonInit() {
layer.cornerRadius = MasterTimelineDefaultCellLayout.iconCornerRadius
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clipsToBounds = true
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addSubview(imageView)
}
func rectForImageView() -> CGRect {
guard let image = iconImage?.image else {
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return CGRect.zero
}
let imageSize = image.size
let viewSize = bounds.size
if imageSize.height == imageSize.width {
if imageSize.height >= viewSize.height * 0.75 {
// Close enough to viewSize to scale up the image.
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)
}
}