124 lines
3.0 KiB
Swift
124 lines
3.0 KiB
Swift
//
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// IconView.swift
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// NetNewsWire-iOS
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//
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// Created by Maurice Parker on 9/17/19.
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// Copyright © 2019 Ranchero Software. All rights reserved.
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//
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import UIKit
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import UIKitExtras
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import Images
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final class IconView: UIView {
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var iconImage: IconImage? = nil {
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didSet {
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guard iconImage !== oldValue else {
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return
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}
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imageView.image = iconImage?.image
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if traitCollection.userInterfaceStyle == .dark {
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let isDark = iconImage?.isDark ?? false
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isDiscernable = !isDark
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}
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else {
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let isBright = iconImage?.isBright ?? false
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isDiscernable = !isBright
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}
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setNeedsLayout()
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}
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}
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private var isDiscernable = true
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private let imageView: UIImageView = {
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let imageView = NonIntrinsicImageView(image: AppAssets.faviconTemplateImage)
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imageView.contentMode = .scaleAspectFit
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imageView.clipsToBounds = true
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imageView.layer.cornerRadius = 2.0
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return imageView
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}()
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private var isVerticalBackgroundExposed: Bool {
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return imageView.frame.size.height < bounds.size.height
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}
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private var isSymbolImage: Bool {
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return iconImage?.isSymbol ?? false
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}
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private var isBackgroundSuppressed: Bool {
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return iconImage?.isBackgroundSupressed ?? false
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}
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override init(frame: CGRect) {
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super.init(frame: frame)
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commonInit()
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}
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required init?(coder: NSCoder) {
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super.init(coder: coder)
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commonInit()
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}
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convenience init() {
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self.init(frame: .zero)
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}
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override func didMoveToSuperview() {
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setNeedsLayout()
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}
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override func layoutSubviews() {
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imageView.setFrameIfNotEqual(rectForImageView())
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updateBackgroundColor()
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}
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}
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private extension IconView {
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func commonInit() {
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layer.cornerRadius = TimelineDefaultCellLayout.iconCornerRadius
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clipsToBounds = true
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addSubview(imageView)
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}
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func rectForImageView() -> CGRect {
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guard let image = iconImage?.image else {
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return CGRect.zero
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}
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let imageSize = image.size
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let viewSize = bounds.size
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if imageSize.height == imageSize.width {
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if imageSize.height >= viewSize.height * 0.75 {
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// Close enough to viewSize to scale up the image.
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return CGRect(x: 0.0, y: 0.0, width: viewSize.width, height: viewSize.height)
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}
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let offset = floor((viewSize.height - imageSize.height) / 2.0)
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return CGRect(x: offset, y: offset, width: imageSize.width, height: imageSize.height)
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}
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else if imageSize.height > imageSize.width {
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let factor = viewSize.height / imageSize.height
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let width = imageSize.width * factor
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let originX = floor((viewSize.width - width) / 2.0)
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return CGRect(x: originX, y: 0.0, width: width, height: viewSize.height)
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}
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// Wider than tall: imageSize.width > imageSize.height
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let factor = viewSize.width / imageSize.width
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let height = imageSize.height * factor
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let originY = floor((viewSize.height - height) / 2.0)
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return CGRect(x: 0.0, y: originY, width: viewSize.width, height: height)
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}
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private func updateBackgroundColor() {
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if !isBackgroundSuppressed && ((iconImage != nil && isVerticalBackgroundExposed) || !isDiscernable) {
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backgroundColor = AppAssets.iconBackgroundColor
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} else {
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backgroundColor = nil
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}
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}
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}
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