NetNewsWire/Multiplatform/macOS/Article/IconView.swift

135 lines
3.0 KiB
Swift

//
// IconView.swift
// Multiplatform macOS
//
// Created by Maurice Parker on 7/7/20.
// Copyright © 2020 Ranchero Software. All rights reserved.
//
import AppKit
final class IconView: NSView {
var iconImage: IconImage? = nil {
didSet {
if iconImage !== oldValue {
imageView.image = iconImage?.image
if NSApplication.shared.effectiveAppearance.isDarkMode {
if self.iconImage?.isDark ?? false {
self.isDiscernable = false
} else {
self.isDiscernable = true
}
} else {
if self.iconImage?.isBright ?? false {
self.isDiscernable = false
} else {
self.isDiscernable = true
}
}
needsDisplay = true
needsLayout = true
}
}
}
private var isDiscernable = true
override var isFlipped: Bool {
return true
}
private let imageView: NSImageView = {
let imageView = NSImageView(frame: NSRect.zero)
imageView.animates = false
imageView.imageAlignment = .alignCenter
imageView.imageScaling = .scaleProportionallyUpOrDown
return imageView
}()
private var hasExposedVerticalBackground: Bool {
return imageView.frame.size.height < bounds.size.height
}
override init(frame frameRect: NSRect) {
super.init(frame: frameRect)
commonInit()
}
required init?(coder: NSCoder) {
super.init(coder: coder)
commonInit()
}
convenience init() {
self.init(frame: NSRect.zero)
}
override func viewDidMoveToSuperview() {
needsLayout = true
needsDisplay = true
}
override func layout() {
resizeSubviews(withOldSize: NSZeroSize)
}
override func resizeSubviews(withOldSize oldSize: NSSize) {
imageView.setFrame(ifNotEqualTo: rectForImageView())
}
override func draw(_ dirtyRect: NSRect) {
guard hasExposedVerticalBackground || !isDiscernable else {
return
}
let color = AppAssets.nsIconBackgroundColor
color.set()
dirtyRect.fill()
}
}
private extension IconView {
func commonInit() {
addSubview(imageView)
wantsLayer = true
layer?.cornerRadius = 4.0
}
func rectForImageView() -> NSRect {
guard !(iconImage?.isSymbol ?? false) else {
return NSMakeRect(0.0, 0.0, bounds.size.width, bounds.size.height)
}
guard let image = iconImage?.image else {
return NSRect.zero
}
let imageSize = image.size
let viewSize = bounds.size
if imageSize.height == imageSize.width {
if imageSize.height >= viewSize.height {
return NSMakeRect(0.0, 0.0, viewSize.width, viewSize.height)
}
let offset = floor((viewSize.height - imageSize.height) / 2.0)
return NSMakeRect(offset, offset, imageSize.width, 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 NSMakeRect(originX, 0.0, width, 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 NSMakeRect(0.0, originY, viewSize.width, height)
}
}