117 lines
2.8 KiB
Swift
117 lines
2.8 KiB
Swift
//
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// TimelineIconView.swift
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// NetNewsWire
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//
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// Created by Brent Simmons on 9/15/19.
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// Copyright © 2019 Ranchero Software. All rights reserved.
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//
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import AppKit
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final class IconView: NSView {
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var iconImage: IconImage? = nil {
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didSet {
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if iconImage !== oldValue {
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imageView.image = iconImage?.image
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needsDisplay = true
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needsLayout = true
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}
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}
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}
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override var isFlipped: Bool {
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return true
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}
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private let imageView: NSImageView = {
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let imageView = NSImageView(frame: NSRect.zero)
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imageView.animates = false
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imageView.imageAlignment = .alignCenter
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imageView.imageScaling = .scaleProportionallyUpOrDown
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return imageView
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}()
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private var hasExposedVerticalBackground: Bool {
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return imageView.frame.size.height < bounds.size.height
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}
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private static var lightBackgroundColor = AppAssets.iconLightBackgroundColor
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private static var darkBackgroundColor = AppAssets.iconDarkBackgroundColor
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override init(frame frameRect: NSRect) {
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super.init(frame: frameRect)
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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: NSRect.zero)
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}
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override func viewDidMoveToSuperview() {
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needsLayout = true
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needsDisplay = true
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}
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override func layout() {
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resizeSubviews(withOldSize: NSZeroSize)
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}
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override func resizeSubviews(withOldSize oldSize: NSSize) {
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imageView.setFrame(ifNotEqualTo: rectForImageView())
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}
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override func draw(_ dirtyRect: NSRect) {
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guard hasExposedVerticalBackground else {
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return
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}
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let color = NSApplication.shared.effectiveAppearance.isDarkMode ? IconView.darkBackgroundColor : IconView.lightBackgroundColor
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color.set()
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dirtyRect.fill()
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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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addSubview(imageView)
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wantsLayer = true
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layer?.cornerRadius = 4.0
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}
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func rectForImageView() -> NSRect {
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guard let image = iconImage?.image else {
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return NSRect.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 NSMakeRect(0.0, 0.0, viewSize.width, viewSize.height)
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}
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let offset = floor((viewSize.height - imageSize.height) / 2.0)
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return NSMakeRect(offset, offset, imageSize.width, 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 NSMakeRect(originX, 0.0, width, 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 NSMakeRect(0.0, originY, viewSize.width, height)
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}
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}
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