c# - 如何知道用户何时按下某个 MediaPlayerElement 按钮（播放、暂停、下一曲目等）？

Question

我有一个用于播放音频的 UWP 桌面应用程序。我正在使用 MediaPlayerElement 并将 MediaPlayer 的 Source 属性设置为 MediaPlaybackList。我有两个问题：

1. 如何知道用户何时按下某个 MediaPlayerElement 按钮（播放、暂停、下一曲目等）？

2. 如何以编程方式更改跑步轨迹？

            <MediaPlayerElement x:Name="mediaPlayerElement" 
                                AutoPlay="False" 
                                HorizontalAlignment="Center" VerticalAlignment="Top"
                                Margin="0,0,0,100"
                                AreTransportControlsEnabled="True" >
                                <MediaPlayerElement.TransportControls>
                                    <MediaTransportControls 
                                             IsSkipBackwardEnabled="False"
                                             IsSkipBackwardButtonVisible="False"
                                             IsSkipForwardEnabled="False"
                                             IsSkipForwardButtonVisible="False"
                                             IsFastForwardButtonVisible="True"
                                             IsFastForwardEnabled="True"
                                             IsFastRewindButtonVisible="True"
                                             IsFastRewindEnabled="True" 
                                            IsFullWindowButtonVisible="False"
                                            IsNextTrackButtonVisible="True"
                                            IsPreviousTrackButtonVisible="True"
                                            IsZoomButtonVisible="False"/>
                                </MediaPlayerElement.TransportControls>
                            </MediaPlayerElement>
   
    MediaPlaybackList mediaPlaybackList = new MediaPlaybackList();
   
    public PlayerPage()
    {
        this.InitializeComponent();
   
        CreatePlaylist();
   
        mediaPlayerElement.MediaPlayer.Source = mediaPlaybackList;
    }
   

Answer 1

如何知道用户何时按下某个 MediaPlayerElement 按钮（播放、暂停、下一曲目等）？

请参阅此处的案例回复。并听SystemMediaTransportControls ButtonPressed事件，然后你可以按下下一个或上一个。

mediaPlayerElement.MediaPlayer.SystemMediaTransportControls.ButtonPressed += SystemMediaTransportControls_ButtonPressed;

private void SystemMediaTransportControls_ButtonPressed(SystemMediaTransportControls sender, SystemMediaTransportControlsButtonPressedEventArgs args)
{
    switch (args.Button)
    {
        case SystemMediaTransportControlsButton.Play:
            break;
        case SystemMediaTransportControlsButton.Pause:
            break;
        case SystemMediaTransportControlsButton.Stop:
            break;
        case SystemMediaTransportControlsButton.Record:
            break;
        case SystemMediaTransportControlsButton.FastForward:
            break;
        case SystemMediaTransportControlsButton.Rewind:
            break;
        case SystemMediaTransportControlsButton.Next:
            break;
        case SystemMediaTransportControlsButton.Previous:
            break;
        case SystemMediaTransportControlsButton.ChannelUp:
            break;
        case SystemMediaTransportControlsButton.ChannelDown:
            break;
        default:
            break;
    }
}

如何以编程方式更改跑步轨迹

什么是跑道，你的意思是打顺序吗？MediaPlaybackList 具有 ShuffleEnabled 属性。您可以将其设置为 true 以播放随机播放。