/// <summary>
/// Handles the video view layout updates.
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">The <see cref="EventArgs"/> instance containing the event data.</param>
private void HandleVideoViewLayoutUpdates(object sender, EventArgs e)
{
if (ContentGrid.Children.IndexOf(VideoView) < 0 || VideoView.Element == null)
{
return;
}
// Compute the position offset of the video
var videoPosition = VideoView.HasOwnDispatcher ?
VideoView.TransformToAncestor(ContentGrid).Transform(new Point(0, 0)) :
VideoView.Element.TransformToAncestor(ContentGrid).Transform(new Point(0, 0));
// Compute the dimensions of the video
var videoSize = VideoView.HasOwnDispatcher ?
VideoView.RenderSize :
VideoView.Element.DesiredSize;
// Validate the dimensions; avoid layout operations with invalid values
if (videoSize.Width <= 0 || double.IsNaN(videoSize.Width) ||
videoSize.Height <= 0 || double.IsNaN(videoSize.Height))
{
return;
}
if (HasVideo || Library.IsInDesignMode)
{
// Position and Size the Captions View
CaptionsView.Width = Math.Floor(videoSize.Width);
CaptionsView.Height = Math.Floor(videoSize.Height * .80); // FCC Safe Caption Area Dimensions
CaptionsView.Margin = new Thickness(
Math.Floor(videoPosition.X + ((videoSize.Width - CaptionsView.RenderSize.Width) / 2d)),
Math.Floor(videoPosition.Y + ((videoSize.Height - CaptionsView.RenderSize.Height) / 2d)),
0,
0);
CaptionsView.Visibility = Visibility.Visible;
// Position and Size the Subtitles View
SubtitlesView.Width = Math.Floor(videoSize.Width * 0.9d);
SubtitlesView.Height = Math.Floor(videoSize.Height / 8d);
SubtitlesView.Margin = new Thickness(
Math.Floor(videoPosition.X + ((videoSize.Width - SubtitlesView.RenderSize.Width) / 2d)),
Math.Floor(videoPosition.Y + videoSize.Height - (1.8 * SubtitlesView.RenderSize.Height)),
0,
0);
SubtitlesView.Visibility = Visibility.Visible;
}
else
{
CaptionsView.Width = 0;
CaptionsView.Height = 0;
CaptionsView.Visibility = Visibility.Collapsed;
SubtitlesView.Width = 0;
SubtitlesView.Height = 0;
SubtitlesView.Visibility = Visibility.Collapsed;
}
}
/// <summary>
/// Initializes a new instance of the <see cref="MediaElement" /> class.
/// </summary>
public MediaElement()
: base()
{
ContentGrid = new Grid {
Name = nameof(ContentGrid)
};
Content = ContentGrid;
ContentGrid.HorizontalAlignment = HorizontalAlignment.Stretch;
ContentGrid.VerticalAlignment = VerticalAlignment.Stretch;
Stretch = VideoView.Stretch;
StretchDirection = VideoView.StretchDirection;
// Add the child controls
ContentGrid.Children.Add(VideoView);
ContentGrid.Children.Add(SubtitleView);
SubtitleView.Padding = new Thickness(5, 0, 5, 0);
SubtitleView.FontSize = 60;
SubtitleView.FontFamily = new System.Windows.Media.FontFamily("Arial Rounded MT Bold");
SubtitleView.FontWeight = FontWeights.Normal;
SubtitleView.TextOutlineWidth = new Thickness(4);
SubtitleView.TextForeground = System.Windows.Media.Brushes.LightYellow;
// Update as the VideoView updates but check if there are valid dimensions and it actually has video
VideoView.LayoutUpdated += (s, e) =>
{
// When video dimensions are invalid, let's not do any layout.
if (VideoView.ActualWidth <= 0 || VideoView.ActualHeight <= 0)
{
return;
}
// Position the Subtitles
var videoViewPosition = VideoView.TransformToAncestor(ContentGrid).Transform(new Point(0, 0));
var targetHeight = VideoView.ActualHeight / 5d;
var targetWidth = VideoView.ActualWidth;
if (SubtitleView.Height != targetHeight)
{
SubtitleView.Height = targetHeight;
}
if (SubtitleView.Width != targetWidth)
{
SubtitleView.Width = targetWidth;
}
var verticalOffset = ContentGrid.ActualHeight - (videoViewPosition.Y + VideoView.ActualHeight);
var verticalOffsetPadding = VideoView.ActualHeight / 20;
var marginBottom = verticalOffset + verticalOffsetPadding;
if (SubtitleView.Margin.Bottom != marginBottom)
{
SubtitleView.Margin = new Thickness(0, 0, 0, marginBottom);
}
};
// Display the control (or not)
if (WindowsPlatform.Instance.IsInDesignTime)
{
// Shows an FFmpeg image if we are in design-time
var bitmap = Properties.Resources.FFmpegMediaElementBackground;
var bitmapSource = Imaging.CreateBitmapSourceFromHBitmap(
bitmap.GetHbitmap(), IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
var controlBitmap = new WriteableBitmap(bitmapSource);
VideoView.Source = controlBitmap;
}
else
{
// Setup the media engine
MediaCore = new MediaEngine(this, new WindowsMediaConnector(this));
}
}
