118 lines
4.2 KiB
Swift
118 lines
4.2 KiB
Swift
//
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// Copyright 2023, 2024 New Vector Ltd.
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//
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// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
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// Please see LICENSE files in the repository root for full details.
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//
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import Compound
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import Foundation
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import SwiftUI
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import SwiftUIIntrospect
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extension View {
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@ViewBuilder
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func bloom() -> some View {
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if #available(iOS 26, *) {
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modifier(BloomModifier())
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} else {
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modifier(OldBloomModifier())
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}
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}
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}
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private struct BloomModifier: ViewModifier {
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@State private var height = CGFloat.zero
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func body(content: Content) -> some View {
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content
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.onGeometryChange(for: CGFloat.self) { proxy in
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proxy.safeAreaInsets.top
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} action: { height in
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self.height = height
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}
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.overlay(alignment: .top) {
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LinearGradient(gradient: .compound.subtle,
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startPoint: .top,
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endPoint: .init(x: 0.5, y: 0.35))
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.ignoresSafeArea(edges: .all)
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.frame(height: height)
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.allowsHitTesting(false)
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// Does not render properly on dark themes otherwise
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.colorScheme(.light)
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}
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}
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}
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private struct OldBloomModifier: ViewModifier {
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@Environment(\.colorScheme) private var colorScheme
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@State private var standardAppearance = UINavigationBarAppearance()
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@State private var scrollEdgeAppearance = UINavigationBarAppearance()
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@State private var bloom = Bloom()
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func body(content: Content) -> some View {
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content
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.introspect(.viewController, on: .supportedVersions, customize: configureBloom)
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}
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private func configureBloom(controller: UIViewController) {
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if controller.navigationItem.standardAppearance == standardAppearance,
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controller.navigationItem.scrollEdgeAppearance == scrollEdgeAppearance,
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canUse(bloom) {
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return
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}
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let bloom = makeBloom()
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standardAppearance.configureWithDefaultBackground()
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standardAppearance.backgroundImage = bloom.image
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standardAppearance.backgroundImageContentMode = .scaleToFill
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controller.navigationItem.standardAppearance = standardAppearance
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scrollEdgeAppearance.configureWithTransparentBackground()
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scrollEdgeAppearance.backgroundImage = bloom.image
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scrollEdgeAppearance.backgroundImageContentMode = .scaleToFill
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scrollEdgeAppearance.backgroundColor = .compound.bgCanvasDefault
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controller.navigationItem.scrollEdgeAppearance = scrollEdgeAppearance
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}
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private func makeBloom() -> Bloom {
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if bloom.image != nil, canUse(bloom) {
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return bloom
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}
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// There's a bug somewhere when rendering in dark mode (which we've mistakenly not been doing)
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// which results in the first 5 stops not having any alpha, only the last one…
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let newImage = ImageRenderer(content: bloomGradient /* .colorScheme(colorScheme) */ ).uiImage
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bloom.image = newImage
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bloom.colorScheme = colorScheme
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bloom.baseColor = .compound.gradientSubtleStop1
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return bloom
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}
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private var bloomGradient: some View {
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LinearGradient(gradient: .compound.subtle,
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startPoint: .top,
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endPoint: .init(x: 0.5, y: 0.7))
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.ignoresSafeArea(edges: .all)
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.frame(width: 256, height: 256)
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}
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private func canUse(_ bloom: Bloom) -> Bool {
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// Don't check for a nil image in here, there's no point re-rendering over and over if the render fails.
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bloom.colorScheme == colorScheme && bloom.baseColor == .compound.gradientSubtleStop1
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}
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// This is a class to avoid a "Modifying state during view update" warning when storing
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// the result on the same run-loop - we want to avoid dispatching that to the next loop as
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// that can result in further (unnecessary) renders being made.
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class Bloom {
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var image: UIImage?
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var colorScheme: ColorScheme?
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var baseColor: Color?
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}
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}
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