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Figure 10-8. MediaSlider visual state when media is playing while download continues One of the challenges of the MediaElement state transitions is that the state change to Playing is raised only once: right when the media is starting to play. Playing then continues without raising any further notifications until a control event like Stop or Pause causes the MediaElement state to change again. This is for several good reasons, not least of which is performance, because the MediaElement may not perform optimally if it tries to keep raising granular events continuously while it is playing. However, in order to report progress while the media is playing, you need a mechanism to notify the code at regular intervals. This is where the DispatcherTimer named disptimerPlayProgressUpdate (which is initialized in the constructor) plays its role. In handling the Playing state change in MediaSource_CurrentStateChanged(), you start disptimerPlayProgressUpdate, which raises a tick event every 50 milliseconds. We chose this value fairly randomly; you can either change it to a value that suits your needs or make it a property on the control to allow you to set it. Note that in the same case block, you format and set the value of textDuration to that in MediaSource.NaturalDuration to display the total duration of the clip. In the Tick handler for disptimerPlayProgressUpdate named PlayProgressUpdate_Tick(), you move the Thumb by setting its Value to a proportion of the MediaSlider range, matching the ratio of the current Position to the MediaSource.NaturalDuration. You also increase the Width of elemPlayProgressIndicator by the same proportion to trail the Thumb to indicate play progress, and you set textPosition at the lowerleft corner of the slider to reflect the current Position value, as shown in Figure 10-8.

If the MediaElement fails to load and play the media, if the media is stopped or paused, and after the play ends, you can check disptimerPlayProgressUpdate to see if it is currently ticking (in other words, whether the IsEnabled property is set to True), and stop it if it is. You also need to enable seeking through the media using the Thumb. To do this, you attach handlers to the Thumb.DragStarted and Thumb.DragCompleted events in OnApplyTemplate(). In the HorizontalThumb_DragStarted() handler, you make sure the media is playing; and if it is, you pause it. This prevents your code in the DispatcherTimer.Tick handler from trying to move the Thumb while the user is dragging it. In HorizontalThumb_DragCompleted(), you set MediaSource.Position by transforming the MediaSlider.Value property back to its corresponding time point in the media s timeline. This causes the media to seek to the newly set position. You then start playing the media again. One last thing to note is that in InitMediaElementConnections(), you deliberately invoke the MediaElement_CurrentStateChanged() handler. This is for cases where the SourceName changes but the new MediaElement being attached is already playing that is, someone switched the PIP video with the main video. The MediaElement state change is not going to fire again, so calling the state-change handler once deliberately causes the textDuration to be updated to reflect the change in video sources.

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The MediaButtonsPanel custom control encapsulates the following play-control functions: play, pause, stop, forward, and rewind. Each function is tied to a Button in the control template. Listing 10-9 shows the control template for MediaButtonsPanel. Listing 10-9. Control Template for MediaButtonsPanel Custom Control <ControlTemplate TargetType="local:MediaButtonsPanel" x:Key="ctMediaButtonsPanelDefault"> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="0.2*" /> <ColumnDefinition Width="0.2*" /> <ColumnDefinition Width="0.2*" /> <ColumnDefinition Width="0.2*" /> <ColumnDefinition Width="0.2*" /> </Grid.ColumnDefinitions> <RepeatButton Grid.Column="0" x:Name="btnRewind" Margin="0,0,1,0"> <RepeatButton.Content> <Path x:Name="Rewind" Stretch="Fill" StrokeThickness="1" StrokeLineJoin="Round" Stroke="#FF000000" Fill="#FF000000" Data="M 69.8333,70.0833L 60.5833, 63.2862L 60.5833,70.0833L 40, 54.9583L 60.5833,39.8333L 60.5833, 46.6304L 69.8333,39.8333L 69.8333, 70.0833 Z "/> </RepeatButton.Content> </RepeatButton> <Button Grid.Column="1" x:Name="btnStop" Margin="1,0,1,0"> <Button.Content> <Path x:Name="Stop" Fill="#FF000000" Stretch="Fill"

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