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import SwiftUI
import UniformTypeIdentifiers
struct FilePreviewQuickLookView: View {
enum FilePreviewFocus: Hashable {
case window
}
@Environment(\.controlActiveState) private var controlActiveState
@Environment(\.colorScheme) private var colorScheme
@Environment(\.dismiss) private var dismiss
@Binding var info: PreviewFileInfo?
@State private var preview: FilePreviewState? = nil
@FocusState private var focusField: FilePreviewFocus?
var body: some View {
Group {
if self.preview?.state != .loaded {
VStack(alignment: .center, spacing: 0) {
Spacer()
ProgressView(value: max(0.0, min(1.0, self.preview?.progress ?? 0.0)))
.focusable(false)
.progressViewStyle(.circular)
.controlSize(.extraLarge)
.frame(maxWidth: 300, alignment: .center)
.padding(.bottom, 48)
Spacer()
}
.background(Color(nsColor: .textBackgroundColor))
.frame(minWidth: 350, maxWidth: .infinity, minHeight: 150, maxHeight: .infinity)
.padding()
}
else {
if let fileURL = self.preview?.fileURL {
QuickLookPreviewView(fileURL: fileURL)
.frame(minWidth: 400, maxWidth: .infinity, minHeight: 400, maxHeight: .infinity)
}
else {
VStack(alignment: .center, spacing: 0) {
Spacer()
Image(systemName: "eye.trianglebadge.exclamationmark")
.resizable()
.scaledToFit()
.frame(maxWidth: .infinity)
.frame(height: 48)
.padding(.bottom)
Group {
Text("This file type is not previewable")
.bold()
Text("Try downloading and opening this file in another application.")
.foregroundStyle(Color.secondary)
}
.font(.system(size: 14.0))
.frame(maxWidth: 300)
.multilineTextAlignment(.center)
Spacer()
Spacer()
}
.frame(minWidth: 350, maxWidth: .infinity, minHeight: 150, maxHeight: .infinity)
.padding()
}
}
}
.focusable()
.focusEffectDisabled()
.background(Color(nsColor: .textBackgroundColor))
.focused(self.$focusField, equals: .window)
.navigationTitle(self.info?.name ?? "File Preview")
.applyNavigationDocumentIfPresent(self.preview?.fileURL)
.toolbar {
if let fileURL = self.preview?.fileURL {
if let info = info {
ToolbarItem(placement: .primaryAction) {
Button {
FileManager.default.copyToDownloads(from: fileURL, using: info.name, bounceDock: true)
} label: {
Label("Download File...", systemImage: "arrow.down")
}
.help("Download File")
}
}
}
}
.task {
if let info = self.info {
self.preview = FilePreviewState(info: info)
self.preview?.download()
}
}
.onAppear {
guard self.info != nil else {
self.dismiss()
return
}
self.focusField = .window
}
.onDisappear {
self.preview?.cancel()
self.preview?.cleanup()
self.dismiss()
}
.onChange(of: self.preview?.state) {
if self.preview?.state == .failed {
self.dismiss()
}
}
.preferredColorScheme(.dark)
}
}
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