Specifying the Namespaces in Office Word

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Specifying the Namespaces
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Begin by listing the namespaces the application will use. Notice the inclusion of Microsoft.Phone.Tasks that will allow us to launch Windows Phone s default media player. As for the MediaElement, it is declared in the XAML page, which you will simply reference here by the control s name. using using using using using System; System.Windows; System.Windows.Media; Microsoft.Phone.Controls; Microsoft.Phone.Tasks;
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namespace MediaPlayerDemo { public partial class MainPage : PhoneApplicationPage
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Initializing Variables
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The variable _updatingMediaTimeline is an extremely important variable that stops the infinite loop in this demo. By setting _updatingMediaTimeline to true while the media timeline (Slider control) is being updated during the CompositionTarget.Rendering event, the media s backward and forward event will wait to be processed until the timeline update is completed. Another way to look at this complexity is to see the purpose of the Slider control that is responsible for displaying the timeline of the media being played. But the Slider control is also responsible for allowing the user to interact to drag the slider forward or backward in order to move the media position. _updatingMediaTimeline will allow only one specific behavior to happen in the Slider control, thereby avoiding unwanted application behavior. private bool _updatingMediaTimeline; public MainPage() { InitializeComponent(); _updatingMediaTimeline = false; // rewinds the media player to the beginning mediaPlayer.Position = System.TimeSpan.FromSeconds(0);
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Handling Video Download Progress
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As the video file download progresses, you will be receiving the percentage of the file got downloaded and you will be displaying the progress updates back to the user by updating the lblDownload. // Download indicator mediaPlayer.DownloadProgressChanged += (s, e) => { lblDownload.Text = string.Format("Downloading {0:0.0%}", mediaPlayer.DownloadProgress); };
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Handling Video Buffering
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You will be setting video BufferingTime property and as the video buffering time progresses you will receive a callback where you will update lblBuffering. // Handle media buffering mediaPlayer.BufferingTime = TimeSpan.FromSeconds(Convert.ToDouble(txtBufferingTime.Text)); mediaPlayer.BufferingProgressChanged += (s, e) => { lblBuffering.Text = string.Format("Buffering {0:0.0%}", mediaPlayer.BufferingProgress); };
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Showing Time Elapsed in the Media Player
CompositionTarget.Rendering is a frame-based event that will fire once per frame, allowing you to update the media timeline (Slider control) that reflects how much of the media is played. By default the event will fire 60 times in one second. You can check this by checking the value of Application.Current.Host.Settings.MaxFrameRate. By using the CompositionTarget.Rendering event, you will be able to see the smooth media player timeline filling up as the media plays. // Updates the media time line (slider control) with total time played // and updates the status with the time played CompositionTarget.Rendering += (s, e) => { _updatingMediaTimeline = true; TimeSpan duration = mediaPlayer.NaturalDuration.TimeSpan; if (duration.TotalSeconds != 0) { double percentComplete = mediaPlayer.Position.TotalSeconds / duration.TotalSeconds; mediaTimeline.Value = percentComplete; TimeSpan mediaTime = mediaPlayer.Position; string text = string.Format("{0:00}:{1:00}", (mediaTime.Hours * 60) + mediaTime.Minutes, mediaTime.Seconds); if (lblStatus.Text != text)
CHAPTER 15 MEDIA
lblStatus.Text = text; _updatingMediaTimeline = false; } }; }
Tip When defining the event handler of CompositionTarget.Rendering, you can use the lambda expression to create a delegate that contains the programming logic. For example, you can rewrite CompositionTarget.Rendering += (s, e) => { } by first declaring the event handler CompositionTarget.Rendering += new EventHandler(CompositionTarget_Rendering) and then creating a method void CompositionTarget_Rendering(object sender, EventArgs e) { }. Using the lambda expression technique makes the code much more readable and in this demo project gives you the ability to group the relevant code together. For more information on the lambda expression, please refer to http://msdn.microsoft.com/en-us/library/bb397687.aspx.
Implementing the Pause Button
When the Pause button is clicked, invoke MediaElement.Pause to pause the media player. Notice also here that you are updating the Status label, communicating to the user the media is in pause mode. Also notice that for unknown reasons, the media player might not be able to pause. You can use mediaPlayer.CanPause to make sure you can pause and otherwise set the Status label to warn the user it could not pause. private void btnPause_Click(object sender, RoutedEventArgs e) { if (mediaPlayer.CanPause) { mediaPlayer.Pause(); lblStatus.Text = "Paused"; } else { lblStatus.Text = "Can not be Paused. Please try again!"; } }
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