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if (elemDownloadProgressIndicator != null) { if (textBufferingPercent != null) textBufferingPercent.Text = string.Format("{0:##.##} %", MediaSource.BufferingProgress * 100); } } private void MediaSource_CurrentStateChanged(object sender, RoutedEventArgs e) { switch (MediaSource.CurrentState) { case MediaElementState.Opening: VisualStateManager.GoToState(this, "Normal", true); break; case MediaElementState.Playing: RefreshMediaStates(); if (disptimerPlayProgressUpdate.IsEnabled == false) disptimerPlayProgressUpdate.Start(); break; case MediaElementState.Paused: if(disptimerPlayProgressUpdate.IsEnabled) disptimerPlayProgressUpdate.Stop(); break; case MediaElementState.Stopped: if (disptimerPlayProgressUpdate.IsEnabled) disptimerPlayProgressUpdate.Stop(); break; case MediaElementState.Buffering: VisualStateManager.GoToState(this,"Buffering",true); break; default: break; } } void MediaSource_MediaOpened(object sender, RoutedEventArgs e) { RefreshMediaStates(); } private void RefreshMediaStates() { VisualStateManager.GoToState(this,

(MediaSource.CanSeek) "CanSeek" : "CannotSeek", true); VisualStateManager.GoToState(this, (MediaSource.NaturalDuration.TimeSpan != TimeSpan.Zero) "KnownDuration" : "UnknownDuration", true); VisualStateManager.GoToState(this, (MediaSource.DownloadProgress == 1.0) "NoDownload" : "NeedsDownload", true); if (textDuration != null && MediaSource.NaturalDuration.TimeSpan != TimeSpan.Zero) textDuration.Text = string.Format("{0:00}:{1:00}:{2:00}:{3:000}", MediaSource.NaturalDuration.TimeSpan.Hours, MediaSource.NaturalDuration.TimeSpan.Minutes, MediaSource.NaturalDuration.TimeSpan.Seconds, MediaSource.NaturalDuration.TimeSpan.Milliseconds); } private void MediaSource_MediaEnded(object sender, RoutedEventArgs e) { if (disptimerPlayProgressUpdate.IsEnabled) disptimerPlayProgressUpdate.Stop(); } private void MediaSource_MediaFailed(object sender, RoutedEventArgs e) { if(disptimerPlayProgressUpdate.IsEnabled) disptimerPlayProgressUpdate.Stop(); } } } Most of the additions to the MediaSlider code (shown in bold in Listing 10-16) are to make sure you reflect the correct visual state of the slider depending on the state of the media. After the media is opened in MediaSource_Opened(), you invoke the RefreshMediaStates() method and check to see if the media is seekable, using the value of the CanSeek property, and navigate to the appropriate state in the SeekStates group. If the duration of the media is available, you navigate to the appropriate state in the DurationStates group. You also check to see if MediaSource.DownloadProgress is already at 100 percent (which is the case if the media is being streamed) and navigate to the appropriate state in the DownloadStates group. Finally, you update the textDuration to reflect the duration of the media just opened. If you refer to the MediaSource_CurrentStateChanged() handler, note that when the media is buffering, you navigate to the Buffering visual state. After the MediaElement starts playing the media, you repeat a call to RefreshMediaStates(). This is to handle cases where the MediaSlider.SourceName gets switched to a MediaElement (consider the PIP scenario again) that is already playing. Then you navigate to the Playing visual state. The only other addition here is a BufferingProgressChanged handler that updates textBufferingPercent with the buffering progress. The next few figures show the effects of the various visual state changes. Figure 10-15 shows the MediaSlider while video is buffering.

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Figure 10-15. Buffering video Figure 10-16 shows the MediaSlider while an on-demand video is playing. Note that although the duration is displayed along with the play progress, there is no download progress indication because the media is being streamed. Also note the presence of the Thumb, indicating that although the media is streamed, seeking within it is enabled because of the combination of an on-demand publishing point and disk-based media.

In order to generate the map using your Google maps key, you simply declare a gmap component and register an onMapClick event listener to respond to the user s request (see Listing 6-25).

Figure 10-16. Playing an on-demand stream Figure 10-17 shows the MediaSlider while a broadcast video is playing. Note that no play-progress or duration information is displayed. Also note the absence of the Thumb, indicating that the broadcast media does not support seeking.

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