RevDoc PreviewContext 3

RevDoc PreviewContext 3.swift

import WidgetKit
import SwiftUI

extension Date {
  var timeString: String {
    let hour = Calendar.current.component(.hour, from: self)
    let minutes = Calendar.current.component(.minute, from: self)
    return "\(hour):\(minutes < 10 ? "0\(minutes)" : "\(minutes)")"
  }
}

struct TextProvider: TimelineProvider {
  public func snapshot(with context: Context, completion: @escaping (DataEntry) -> ()) {}
  public func timeline(with context: Context, completion: @escaping (Timeline<Entry>) -> ()) {}
}

struct DataEntry: TimelineEntry {
  public let date = Date()
  public let text : String
}

struct DataWidgetEntryView : View {
  @Environment(\.widgetFamily) var family
  
  static let smallEntry = TextProvider.Entry(text: "Small size")
  static let mediumEntry = TextProvider.Entry(text: "Medium size")
  static let largeEntry = TextProvider.Entry(text: "Large size")
  static let defaultEntry = TextProvider.Entry(text: "Default")
  
  
  var backgroundColor: Color {
    switch family {
    case .systemSmall: return .red
    case .systemMedium: return .green
    case .systemLarge: return .blue
    default: return .orange
    }
  }
  
  var entry: DataEntry {
    switch family {
    case .systemSmall: return Self.smallEntry
    case .systemMedium: return Self.mediumEntry
    case .systemLarge: return Self.largeEntry
    default: return Self.defaultEntry
    }
  }
  
  var body: some View {
    WidgetTextView(entry: entry)
      .background(backgroundColor)
  }
}

struct WidgetTextView: View {
  let entry: DataEntry
  
  var body: some View {
    Text("\(entry.date.timeString)\n\(entry.text)")
      .font(.largeTitle)
      .fontWeight(.bold)
      .frame(maxWidth: .infinity, maxHeight: .infinity)
      .multilineTextAlignment(.center)
  }
}

struct DataWidget: Widget {
  public var body: some WidgetConfiguration {
    StaticConfiguration(kind: "DataWidget", provider: TextProvider(), placeholder:  Text("Placeholder View")) { entry in DataWidgetEntryView()
    }
    .configurationDisplayName("Data Widget")
    .description("This is a widget")
  }
}


@main
struct MyWidgetBundle: WidgetBundle {
  @WidgetBundleBuilder
  var body: some Widget {
    DataWidget()
  }
}

struct DataWidget_Previews: PreviewProvider {
  static var previews: some View {
      DataWidgetEntryView()
.previewContext(WidgetPreviewContext(family: .systemSmall))
      DataWidgetEntryView()
      .previewContext(WidgetPreviewContext(family: .systemMedium))
      DataWidgetEntryView()
      .previewContext(WidgetPreviewContext(family: .systemLarge))
  }
}