NetNewsWire/Mac/MainWindow/ArticleExtractorButton.swift

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2.7 KiB
Swift
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//
// ArticleExtractorButton.swift
// NetNewsWire
//
// Created by Maurice Parker on 8/10/20.
// Copyright © 2020 Ranchero Software. All rights reserved.
//
import AppKit
enum ArticleExtractorButtonState {
case error
case animated
case on
case off
}
class ArticleExtractorButton: NSButton {
private var animatedLayer: CALayer?
var buttonState: ArticleExtractorButtonState = .off {
didSet {
if buttonState != oldValue {
switch buttonState {
case .error:
stripAnimatedSublayer()
image = AppAssets.articleExtractorError
case .animated:
image = nil
needsLayout = true
case .on:
stripAnimatedSublayer()
image = AppAssets.articleExtractorOn
case .off:
stripAnimatedSublayer()
image = AppAssets.articleExtractorOff
}
}
}
}
override func accessibilityLabel() -> String? {
switch buttonState {
case .error:
return NSLocalizedString("Error - Reader View", comment: "Error - Reader View")
case .animated:
return NSLocalizedString("Processing - Reader View", comment: "Processing - Reader View")
case .on:
return NSLocalizedString("Selected - Reader View", comment: "Selected - Reader View")
case .off:
return NSLocalizedString("Reader View", comment: "Reader View")
}
}
override init(frame frameRect: NSRect) {
super.init(frame: frameRect)
commonInit()
}
required init?(coder: NSCoder) {
super.init(coder: coder)
commonInit()
}
private func commonInit() {
wantsLayer = true
bezelStyle = .texturedRounded
image = AppAssets.articleExtractorOff
imageScaling = .scaleProportionallyDown
widthAnchor.constraint(equalTo: heightAnchor).isActive = true
}
override func layout() {
super.layout()
guard case .animated = buttonState else {
return
}
stripAnimatedSublayer()
addAnimatedSublayer(to: layer!)
}
private func stripAnimatedSublayer() {
animatedLayer?.removeFromSuperlayer()
}
private func addAnimatedSublayer(to hostedLayer: CALayer) {
let image1 = AppAssets.articleExtractorOff.tinted(with: NSColor.controlTextColor)
let image2 = AppAssets.articleExtractorOn.tinted(with: NSColor.controlTextColor)
let images = [image1, image2, image1]
animatedLayer = CALayer()
let imageSize = AppAssets.articleExtractorOff.size
animatedLayer!.bounds = CGRect(x: 0, y: 0, width: imageSize.width, height: imageSize.height)
animatedLayer!.position = CGPoint(x: bounds.midX, y: bounds.midY)
hostedLayer.addSublayer(animatedLayer!)
let animation = CAKeyframeAnimation(keyPath: "contents")
animation.calculationMode = CAAnimationCalculationMode.linear
animation.keyTimes = [0, 0.5, 1]
animation.duration = 2
animation.values = images
animation.repeatCount = HUGE
animatedLayer!.add(animation, forKey: "contents")
}
}