WPF

<Window x:Class="Interlace.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="771" Width="741">
    <Grid SnapsToDevicePixels="True">
        <Rectangle Width="600" Height="400" Fill="Red" x:Name="r"/>
        <Rectangle Width="600" Height="400" Fill="Green" x:Name="g"/>
        <Rectangle Width="600" Height="400" Fill="Blue" x:Name="b" />
    </Grid>
</Window>

private BitmapSource CreateMask(int size)
{
    WriteableBitmap bmp = new WriteableBitmap(size, 1, 96, 96, PixelFormats.Pbgra32, null);

    int[] mask = new int[size];
    int opaque = BitConverter.ToInt32(new byte[] { 255, 255, 255, 255 }, 0), transparent = BitConverter.ToInt32(new byte[] { 255, 255, 255, 0 }, 0);
    mask[0] = opaque;
    for (int i = 1; i < mask.Length; i++)
        mask[i] = transparent;
    bmp.WritePixels(new Int32Rect(0, 0, size, 1), mask, size * 4, 0);
    return bmp;
}

var mask = CreateMask(3);

RenderOptions.SetBitmapScalingMode(g, BitmapScalingMode.NearestNeighbor);
RenderOptions.SetBitmapScalingMode(b, BitmapScalingMode.NearestNeighbor);

b.OpacityMask = new ImageBrush(mask) {TileMode = TileMode.Tile, Viewport = new Rect(0,0,1.0/200,1)};
g.OpacityMask = new ImageBrush(mask) {TileMode = TileMode.Tile, Viewport = new Rect(1.0/600, 0, 1.0 / 200, 1) };

Insincere Dave wrote:

If you replace the coloured rectangles with mediaelements you should be able to do it. I don't know about the performance though.

<Window x:Class="TestWPF___TripleView.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Width="1200" Height="600" 
    WindowStyle="None" ResizeMode="NoResize" WindowStartupLocation="CenterScreen" Background="Black">
    <Canvas SnapsToDevicePixels="True" Loaded="WindowLoaded">
        <MediaElement Width="600" Height="1200" 
                      Source=".\Video\1.mpg" 
                      x:Name="r" 
                      Stretch="Fill">
            <MediaElement.LayoutTransform>
                <TransformGroup>
                    <ScaleTransform ScaleX="1" ScaleY="1"/>
                    <RotateTransform Angle="-90"/>
                </TransformGroup>
            </MediaElement.LayoutTransform>
        </MediaElement>
        <MediaElement Width="600" Height="1200" 
                      Source=".\Video\2.wmv" 
                      x:Name="g" 
                      Stretch="Fill">
            <MediaElement.LayoutTransform>
                <TransformGroup>
                    <ScaleTransform ScaleX="1" ScaleY="1"/>
                    <RotateTransform Angle="-90"/>
                </TransformGroup>
            </MediaElement.LayoutTransform>
        </MediaElement>
        <MediaElement Width="600" Height="1200" 
                      Source=".\Video\3.mpg" 
                      x:Name="b" 
                      Stretch="Fill">
            <MediaElement.LayoutTransform>
                <TransformGroup>
                    <ScaleTransform ScaleX="1" ScaleY="1"/>
                    <RotateTransform Angle="-90"/>
                </TransformGroup>
            </MediaElement.LayoutTransform>
        </MediaElement>
    </Canvas>
</Window>

<DataTemplate DataType="{x:Type local:Obs}">      
     <Button Grid.Row="{Binding Path=Row, RelativeSource={RelativeSource AncestorType={x:Type Grid}}}" 
             Grid.Column="{Binding Path=Col, RelativeSource={RelativeSource AncestorType={x:Type Grid}}}" 
             Click="Button_Click">
..

Timmy Kokke wrote:

Is this what is supposed to happen?

Mark Salsbery
Microsoft MVP - Visual C++

Public Overrides Function SelectStyle(ByVal item As Object, 
                                      ByVal container As System.Windows.DependencyObject)
                                      As System.Windows.Style
    Dim matElem As Obs = TryCast(item, Obs)

    Dim ret As New Style()
    If matElem IsNot Nothing Then
        ret.Setters.Add(New Setter(Grid.RowProperty, matElem.PositionY))
        ret.Setters.Add(New Setter(Grid.ColumnProperty, matElem.PositionX))
    End If

    Return ret
End Function

public class ObsItemStyleSelector : StyleSelector
{
    public override Style SelectStyle(object item, DependencyObject container)
    {
        Obs obs = item as Obs;
        ContentPresenter cp = container as ContentPresenter;

        if (null != obs && null != cp)
        {
            Binding binding = new Binding("Row");
            binding.Source = obs;
            cp.SetBinding(Grid.RowProperty, binding);

            binding = new Binding("Col");
            binding.Source = obs;
            cp.SetBinding(Grid.ColumnProperty, binding);
        }

        return null;
    }
}

Mark Salsbery
Microsoft MVP - Visual C++