namespace MoviePlayer
{
public partial class MainPage : PhoneApplicationPage
{
// Constructor
public MainPage()
{
InitializeComponent();

// Re-assign names already in the XAML file
appbarRewindButton = this.ApplicationBar.Buttons[0] as ApplicationBarIconButton;
appbarPlayButton = this.ApplicationBar.Buttons[1] as ApplicationBarIconButton;
appbarPauseButton = this.ApplicationBar.Buttons[2] as ApplicationBarIconButton;
appbarEndButton = this.ApplicationBar.Buttons[3] as ApplicationBarIconButton;
}

// ApplicationBar buttons
void OnAppbarRewindClick(object sender, EventArgs args)
{
mediaElement.Position = TimeSpan.Zero;
}

void OnAppbarPlayClick(object sender, EventArgs args)
{
mediaElement.Play();
}

void OnAppbarPauseClick(object sender, EventArgs args)
{
mediaElement.Pause();
}

void OnAppbarEndClick(object sender, EventArgs args)
{
mediaElement.Position = mediaElement.NaturalDuration.TimeSpan;
}

// MediaElement events
void OnMediaElementMediaFailed(object sender, ExceptionRoutedEventArgs args)
{
errorText.Text = args.ErrorException.Message;
}

void OnMediaElementMediaOpened(object sender, RoutedEventArgs args)
{
appbarRewindButton.IsEnabled = true;
appbarEndButton.IsEnabled = true;
}

void OnMediaElementCurrentStateChanged(object sender, RoutedEventArgs args)
{
statusText.Text = mediaElement.CurrentState.ToString();

if (mediaElement.CurrentState == MediaElementState.Stopped ||
mediaElement.CurrentState == MediaElementState.Paused)
{
appbarPlayButton.IsEnabled = true;
appbarPauseButton.IsEnabled = false;
}
else if (mediaElement.CurrentState == MediaElementState.Playing)
{
appbarPlayButton.IsEnabled = false;
appbarPauseButton.IsEnabled = true;
}
}
}
}