/// <summary>
/// Back button event raised.
/// UWP WebView native back function doesn't respect history.pushState so this
/// event is sent to the WebView as JS command using the InvokeScript method
/// </summary>
private async void NavigationBackRequested(object sender, BackRequestedEventArgs e)
{
if (!WebPlayer.CanGoBack)
{
return;
}
e.Handled = true;
InvokedByBackEvent = true;
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, async() =>
await WebPlayer.InvokeScriptAsync("eval", new [] { "history.back();" }));
}
/// <summary>
/// Receive control messages from the web player
/// </summary>
public async void ScriptNotify(object sender, NotifyEventArgs e)
{
var data = e.Value.Split('\n');
switch (data[0])
{
// Custom styles are ready to be loaded
case "LoadCustomStyles":
await WebPlayer.InvokeScriptAsync("AppendCustomStyle", new[] { File.ReadAllText("WebPlayer/Style/Player.min.css") });
break;
// Song info change
case "SystemMediaControlsSong":
if (data.Length < 3)
{
return;
}
SystemMediaControls.UpdateSongInfo(data[1], data[2]);
break;
// Media control buttons change
case "SystemMediaControlsButtons":
if (data.Length < 5)
{
return;
}
SystemMediaControls.PrevButtonEnabled = data[1] == "true";
SystemMediaControls.NextButtonEnabled = data[2] == "true";
SystemMediaControls.PlayButtonEnabled = data[3] == "true";
SystemMediaControls.IsPlaying = data[4] == "true";
break;
// Transparent tile pin request
case "RequestPinTransparentTile":
TransparentTile.PinRequest();
break;
// Load default web player page
case "RequestReloadWebPlayer":
LoadWebPlayer();
break;
default:
Debug.WriteLine($"Unknown web player message: {e.Value}");
break;
}
}