[英]VideoDrawing on XAML main window?
I have the following simple example in WPF to play a video file using a VideoDrawing object - here is the code behind: 我在WPF中有以下简单示例,可以使用VideoDrawing对象播放视频文件-这是背后的代码:
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
MediaTimeline timeline = new MediaTimeline(new Uri(@"c:\test\RedRock-uhd-h264.mp4", UriKind.Absolute));
timeline.RepeatBehavior = RepeatBehavior.Forever;
MediaClock clock = timeline.CreateClock();
MediaPlayer player = new MediaPlayer();
player.Clock = clock;
VideoDrawing drawing = new VideoDrawing();
drawing.Rect = new Rect(0, 0, 820, 600); //<--video size is 620 x 400 same as XAML MainWindow size
drawing.Rect = new Rect(0, 0, 420, 280); //<--video size is 620 x 400 same as XAML MainWindow size
drawing.Rect = new Rect(0, 0, 220, 80); //<--video size is 620 x 400 same as XAML MainWindow size
drawing.Rect = new Rect(0, 0, 1, 1); //<--video size is 620 x 400 same as XAML MainWindow size
drawing.Rect = new Rect(0, 0, 0, 0); //<--video does not show
//drawing.Rect = new Rect(0, 0, 0, 0); //<--video does not show
drawing.Player = player;
DrawingBrush brush = new DrawingBrush(drawing);
this.Background = brush;
}
}
and here is the XAML: 这是XAML:
<Window x:Class="MyMediaPlayer.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MediaPlayer in WPF" Width="620" Height="400"
WindowStyle="None"
ShowInTaskbar="True"
AllowsTransparency="True"
Background="Transparent"
WindowStartupLocation="Manual"
Left="0"
Top="0">
</Window>
look at the lines "drawing.Rect = new Rect(…) above and note the comments - no matter what size I set the Rect to - the video always plays at the size of the XAML MainWindow size (620, 400), however I have to set at least some Rect size I can't set it to 0 or comment it out. It seems like the video ought to play at the Rect size set, unless it is larger than the XAML MainWindow? What is it I don't understand about what I am doing and why doesn't the video play to the size of the Rect? 查看上面的“ drawing.Rect = new Rect(…)”行,并注意注释-无论我将Rect设置为什么大小-视频始终以XAML MainWindow大小(620,400)的大小播放。必须至少设置一些Rect大小,我不能将其设置为0或将其注释掉。好像视频应该以Rect大小设置播放,除非它大于XAML MainWindow?不了解我在做什么,为什么视频无法播放Rect的大小?
Set the stretch mode to None: 将拉伸模式设置为“无”:
brush.Stretch = Stretch.None;
The problem with this of course is that you now don't have a way to set the color of the area around the player. 当然,问题在于您现在无法设置播放器周围区域的颜色。 If you want control of that then you'll have to switch to a VisualBrush and use a MediaElement instead:
如果要控制它,则必须切换到VisualBrush并使用MediaElement代替:
// create a grid and bind it to the parent window's size
var grid = new Grid { Background = Brushes.CornflowerBlue }; // <- sets background color
grid.SetBinding(WidthProperty, new Binding
{
RelativeSource = new RelativeSource(RelativeSourceMode.FindAncestor, typeof(Window), 1),
Path = new PropertyPath("ActualWidth"),
Mode = BindingMode.OneWay,
UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged
});
grid.SetBinding(HeightProperty, new Binding
{
RelativeSource = new RelativeSource(RelativeSourceMode.FindAncestor, typeof(Window), 1),
Path = new PropertyPath("ActualHeight"),
Mode = BindingMode.OneWay,
UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged
});
// add the media player
grid.Children.Add(new MediaElement
{
Source = new Uri("yourvideo.mp4", UriKind.RelativeOrAbsolute),
LoadedBehavior = MediaState.Play,
Stretch = Stretch.Fill,
HorizontalAlignment = HorizontalAlignment.Center,
VerticalAlignment = VerticalAlignment.Center,
Width = 640, // <-- video size
Height = 480
});
// wrap it all up in a visual brush
this.Background = new VisualBrush { Visual = grid };
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