Ole André Vadla Ravnås
b6ee7d7187
The playground, the notebook cells, the source editor with its marks, the inspector columns and the canvas are written once for both Apple platforms, with a file naming what the two frameworks call differently. The editor is where they really part company. The engine owns the image and its start-up, so a mission reaches the whole of Pharo.
75 lines
2.1 KiB
Swift
75 lines
2.1 KiB
Swift
import MetalKit
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import SwiftUI
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#if canImport(AppKit)
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import AppKit
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typealias PlatformView = NSView
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typealias PlatformViewRepresentable = NSViewRepresentable
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#elseif canImport(UIKit)
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import UIKit
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typealias PlatformView = UIView
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typealias PlatformViewRepresentable = UIViewRepresentable
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#endif
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/// A SwiftUI view living inside a view hierarchy the platform lays out. AppKit
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/// hosts one outright; UIKit hosts it through a controller, which has to be
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/// kept alive for as long as the view is.
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final class PlatformHostingView: PlatformView {
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#if canImport(AppKit)
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private let hosting: NSHostingView<AnyView>
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init(rootView: some View) {
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hosting = NSHostingView(rootView: AnyView(rootView))
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super.init(frame: .zero)
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addSubview(hosting)
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}
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override func layout() {
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super.layout()
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hosting.frame = bounds
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}
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var fittingHeight: CGFloat {
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layoutSubtreeIfNeeded()
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return hosting.fittingSize.height
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}
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#elseif canImport(UIKit)
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private let hosting: UIHostingController<AnyView>
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init(rootView: some View) {
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hosting = UIHostingController(rootView: AnyView(rootView))
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super.init(frame: .zero)
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hosting.view.backgroundColor = .clear
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addSubview(hosting.view)
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}
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override func layoutSubviews() {
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super.layoutSubviews()
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hosting.view.frame = bounds
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}
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var fittingHeight: CGFloat {
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hosting.sizeThatFits(in: CGSize(width: bounds.width, height: .greatestFiniteMagnitude)).height
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}
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#endif
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@available(*, unavailable)
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required init?(coder: NSCoder) {
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fatalError("PlatformHostingView is not loaded from a nib")
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}
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}
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extension MTKView {
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/// How many pixels a point is worth where the view is not laid out yet and
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/// its own drawable cannot say.
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var pixelsPerPoint: CGFloat {
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#if canImport(AppKit)
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return window?.backingScaleFactor ?? 1
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#else
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return window?.screen.scale ?? contentScaleFactor
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#endif
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}
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}
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