51 lines
1.5 KiB
Swift
51 lines
1.5 KiB
Swift
//
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// Swiftfin is subject to the terms of the Mozilla Public
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// License, v2.0. If a copy of the MPL was not distributed with this
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// file, you can obtain one at https://mozilla.org/MPL/2.0/.
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//
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// Copyright (c) 2024 Jellyfin & Jellyfin Contributors
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//
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import SwiftUI
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struct BackgroundParallaxHeaderModifier<Header: View>: ViewModifier {
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@Binding
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private var scrollViewOffset: CGFloat
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@State
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private var contentSize: CGSize = .zero
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private let height: CGFloat
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private let multiplier: CGFloat
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private let header: () -> Header
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init(
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_ scrollViewOffset: Binding<CGFloat>,
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height: CGFloat,
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multiplier: CGFloat = 1,
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@ViewBuilder header: @escaping () -> Header
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) {
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self._scrollViewOffset = scrollViewOffset
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self.height = height
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self.multiplier = multiplier
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self.header = header
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}
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func body(content: Content) -> some View {
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content
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.size($contentSize)
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.background(alignment: .top) {
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header()
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.offset(y: scrollViewOffset > 0 ? -scrollViewOffset * multiplier : 0)
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.scaleEffect(scrollViewOffset < 0 ? (height - scrollViewOffset) / height : 1, anchor: .top)
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.frame(width: contentSize.width)
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.mask(alignment: .top) {
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Color.black
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.frame(height: max(0, height - scrollViewOffset))
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}
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.ignoresSafeArea()
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}
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}
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}
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