131 lines
4.4 KiB
Swift
131 lines
4.4 KiB
Swift
//
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// Copyright 2022 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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import QuickLook
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import SwiftUI
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extension View {
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/// Preview a media file using a QuickLook Preview Controller. The preview is interactive with
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/// the dismiss gesture working as expected if it was presented from UIKit.
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func interactiveQuickLook(item: Binding<MediaPreviewItem?>) -> some View {
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modifier(InteractiveQuickLookModifier(item: item))
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}
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}
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private struct InteractiveQuickLookModifier: ViewModifier {
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@Binding var item: MediaPreviewItem?
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func body(content: Content) -> some View {
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content.background {
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if let item {
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MediaPreviewViewController(previewItem: item) { self.item = nil }
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}
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}
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}
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}
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private struct MediaPreviewViewController: UIViewControllerRepresentable {
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let previewItem: MediaPreviewItem
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let onDismiss: () -> Void
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func makeUIViewController(context: Context) -> PreviewHostingController {
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PreviewHostingController(previewItem: previewItem, onDismiss: onDismiss)
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}
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func updateUIViewController(_ uiViewController: PreviewHostingController, context: Context) { }
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/// A view controller that hosts the QuickLook preview.
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///
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/// This wrapper somehow allows the preview controller to do presentation/dismissal
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/// animations and interactions which don't work if you represent it directly to SwiftUI 🤷♂️
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class PreviewHostingController: UIViewController, QLPreviewControllerDataSource, QLPreviewControllerDelegate {
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let previewItem: MediaPreviewItem
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let onDismiss: () -> Void
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var previewController: QLPreviewController?
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init(previewItem: MediaPreviewItem, onDismiss: @escaping () -> Void) {
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self.previewItem = previewItem
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self.onDismiss = onDismiss
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super.init(nibName: nil, bundle: nil)
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}
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@available(*, unavailable)
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required init?(coder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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override func viewDidLoad() {
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view.backgroundColor = .clear
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}
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override func viewWillAppear(_ animated: Bool) {
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super.viewWillAppear(animated)
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guard self.previewController == nil else { return }
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let previewController = QLPreviewController()
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previewController.dataSource = self
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previewController.delegate = self
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present(previewController, animated: true)
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self.previewController = previewController
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}
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// MARK: QLPreviewControllerDataSource
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func numberOfPreviewItems(in controller: QLPreviewController) -> Int {
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1
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}
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func previewController(_ controller: QLPreviewController, previewItemAt index: Int) -> QLPreviewItem {
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previewItem
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}
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// MARK: QLPreviewControllerDelegate
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func previewControllerDidDismiss(_ controller: QLPreviewController) {
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onDismiss()
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}
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}
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}
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/// Wraps a media file and title to be previewed with QuickLook.
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class MediaPreviewItem: NSObject, QLPreviewItem {
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let file: MediaFileHandleProxy
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var previewItemURL: URL? { file.url }
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let previewItemTitle: String?
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init(file: MediaFileHandleProxy, title: String?) {
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self.file = file
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previewItemTitle = title
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}
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}
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// MARK: - Previews
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struct PreviewView_Previews: PreviewProvider {
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static let previewURL: URL = "https://www.w3.org/WAI/ER/tests/xhtml/testfiles/resources/pdf/dummy.pdf"
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static let previewItem = MediaPreviewItem(file: .unmanaged(url: previewURL),
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title: "Important Document")
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static var previews: some View {
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MediaPreviewViewController(previewItem: previewItem) { }
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}
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}
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