Add playing indicator

Shared/Views/PlayingIndicatorView.swift

@@ -0,0 +1,43 @@
+import SwiftUI
+
+struct PlayingIndicatorView: View {
+    var video: Video?
+    var height = 65.0
+
+    @State private var drawingHeight = true
+
+    @ObservedObject private var player = PlayerModel.shared
+
+    var body: some View {
+        HStack(spacing: 2) {
+            bar(low: 0.4)
+                .animation(animation.speed(1.5), value: drawingHeight)
+            bar(low: 0.3)
+                .animation(animation.speed(1.2), value: drawingHeight)
+            bar(low: 0.5)
+                .animation(animation.speed(1.0), value: drawingHeight)
+        }
+        .opacity(player.currentVideo == video && player.isPlaying ? 1 : 0)
+        .onAppear {
+            drawingHeight.toggle()
+        }
+    }
+
+    func bar(low: Double = 0.0, high: Double = 1.0) -> some View {
+        RoundedRectangle(cornerRadius: 3)
+            .foregroundColor(.white)
+            .frame(height: (drawingHeight ? high : low) * height)
+            .frame(height: height, alignment: .bottom)
+            .shadow(radius: 3)
+    }
+
+    var animation: Animation {
+        .easeIn(duration: 0.5).repeatForever()
+    }
+}
+
+struct PlayingIndicatorView_Previews: PreviewProvider {
+    static var previews: some View {
+        PlayingIndicatorView(video: .fixture)
+    }
+}