Ustawianie okna XAML zawsze na wierzchu (ale bez właściwości TopMost)

Question

Pracuję nad aplikacją opartą na OptiTrack SDK (od NaturalPoint). Muszę uruchomić okno aplikacji jako "Zawsze na wierzchu". Okno jest zaprojektowane w XAML i jest kontrolowane w klasie "CameraView", ale nie zawiera własności "TopMost" lub jej odpowiednika. Załączony jest kod "CameraView.xaml.cs" i kod "CameraView.xaml", które są częścią OptiTrack SDK (NaturalPoint) o nazwie "Single_Camera_CSharp_.NET_3.0".

Można oczekiwać, że klasa CameraView będzie zawierać właściwości lub członków, aby ustawić pozycję okna na ekranie lub ustawić go na TopMost, ale w zakresie przeszukania niczego nie znalazłem. Zastanawiam się, co powinienem zrobić.

Dziękuję Brian

================

"CameraView.xaml.cs"

using System; 
using System.IO; 
using System.Net; 
using System.Windows; 
using System.Windows.Controls; 
using System.Windows.Data; 
using System.Windows.Media; 
using System.Windows.Media.Animation; 
using System.Windows.Navigation; 
using System.Drawing.Imaging; 
using System.Drawing.Drawing2D; 
using System.Windows.Threading; 

namespace TestProject 
{ 
public partial class CameraView 
{ 
private const int NP_OPTION_OBJECT_COLOR_OPTION = 3; 
private const int NP_OPTION_VIDEO_TYPE = 48; 
private const int NP_OPTION_NUMERIC_DISPLAY_ON = 71; 
private const int NP_OPTION_NUMERIC_DISPLAY_OFF = 72; 
private const int NP_OPTION_FETCH_RLE = 73; 
private const int NP_OPTION_FETCH_GRAYSCALE = 74; 
private const int NP_OPTION_FRAME_DECIMATION = 52; 
private const int NP_OPTION_INTENSITY = 50; 
private const int NP_OPTION_SEND_EMPTY_FRAMES = 41; 
private const int NP_OPTION_THRESHOLD = 5; 
private const int NP_OPTION_EXPOSURE = 46; 
private const int NP_OPTION_SEND_FRAME_MASK = 73; 
private const int NP_OPTION_TEXT_OVERLAY_OPTION = 74; 
// public delegate void OnCameraViewCreate(CameraView camera); 
// public static OnCameraViewCreate onCameraViewCreate; 
private System.Drawing.Bitmap raw = new System.Drawing.Bitmap(353, 288, System.Drawing.Imaging.PixelFormat.Format32bppArgb); 
private int mFrameCounter; 
private int mDisplayCounter; 
private DispatcherTimer timer1 = new DispatcherTimer(); 
private bool mVideoFrameAvailable = false; 
private int mNumeric = -1; 
private bool mGreyscale = false; 
private bool mOverlay = true; 
public CameraView() 
{ 
this.InitializeComponent(); 

timer1.Interval = new TimeSpan(0, 0, 0, 0, 10); 
timer1.Tick += new EventHandler(timer1_Tick); 
} 

public int Numeric 
{ 
get { return mNumeric; } 
set 
{ 
mNumeric = value % 100; 
if (mNumeric >= 0) 
{ 
if (Camera != null) 
Camera.SetOption(NP_OPTION_NUMERIC_DISPLAY_ON, value % 100); 
} 
} 
} 

private bool CameraRunning = false; 
private OptiTrack.NPCamera mCamera; 
public OptiTrack.NPCamera Camera 
{ 
get { return mCamera; } 
set 
{ 
if (mCamera == value) return; //== Don't do anything if you're assigning the same camera == 

if (mCamera != null) 
{ 
//== Shut the selected camera down ==<< 

if (CameraRunning) 
{ 
CameraRunning = false; 
mCamera.Stop(); 
mCamera.FrameAvailable -= FrameAvailable; 
} 
} 

mCamera = value; 

if (mCamera == null) 
{ 
mNumeric = -1; 
} 
else 
{ 
serialLabel.Content = "Camera "+mCamera.SerialNumber.ToString(); //mNumeric.ToString(); 
} 
} 
} 

private void FrameAvailable(OptiTrack.NPCamera Camera) 
{ 
mFrameCounter++; 

try 
{ 
OptiTrack.NPCameraFrame frame = Camera.GetFrame(0); 
int id = frame.Id; 
if (CameraRunning) 
{ 
GetFrameData(Camera, frame); 
} 

frame.Free(); 
} 
catch (Exception) 
{ 
int r = 0; 
r++; 
} 
} 
private void GetFrameData(OptiTrack.NPCamera camera, OptiTrack.NPCameraFrame frame) 
{ 
BitmapData bmData = raw.LockBits(new System.Drawing.Rectangle(0, 0, raw.Width, raw.Height), 
ImageLockMode.ReadWrite, System.Drawing.Imaging.PixelFormat.Format32bppArgb); 

int stride = bmData.Stride; 
System.IntPtr bufferPtr = bmData.Scan0; 
unsafe 
{ 
byte* buffer = (byte*)(void*)bufferPtr; 
camera.GetFrameImage(frame, bmData.Width, bmData.Height, bmData.Stride, 32, ref buffer[0]); 
} 
raw.UnlockBits(bmData); 
mVideoFrameAvailable = true; 
} 

private void timer1_Tick(object sender, EventArgs e) 
{ 
if (CameraRunning && mVideoFrameAvailable) 
{ 
mVideoFrameAvailable = false; 
cameraImage.Source = Img(raw); 
mDisplayCounter++; 
} 
} 

private System.Windows.Media.ImageSource Img(System.Drawing.Bitmap img) 
{ 
System.Drawing.Imaging.BitmapData bmData = img.LockBits(new System.Drawing.Rectangle(0, 0, img.Width, img.Height), 
System.Drawing.Imaging.ImageLockMode.ReadWrite, System.Drawing.Imaging.PixelFormat.Format32bppPArgb); 

System.Windows.Media.Imaging.BitmapSource bitmap = System.Windows.Media.Imaging.BitmapSource.Create(
img.Width, img.Height, 96, 96, PixelFormats.Bgra32, 
System.Windows.Media.Imaging.BitmapPalettes.WebPalette, 
bmData.Scan0, bmData.Stride * bmData.Height, bmData.Stride); 
img.UnlockBits(bmData); 

return bitmap; 
} 
private void startStopButton_Click(object sender, RoutedEventArgs e) 
{ 
if (CameraRunning) 
StopCamera(); 
else 
StartCamera(); 
} 

public void StartCamera() 
{ 
if (Camera != null) 
{ 
mFrameCounter = 0; 
mDisplayCounter = 0; 

Camera.FrameAvailable += FrameAvailable; 

Camera.SetOption(NP_OPTION_VIDEO_TYPE, 0); 
Camera.SetOption(NP_OPTION_FRAME_DECIMATION, 1); 

Camera.SetOption(NP_OPTION_INTENSITY, 0); 
Camera.SetOption(NP_OPTION_EXPOSURE, 10); 
Camera.SetOption(NP_OPTION_THRESHOLD, 50); 
Camera.SetOption(NP_OPTION_OBJECT_COLOR_OPTION, 0); 
SetOverlayOption(); 
SetGreyscaleOption(); 

timer1.Start(); 
Camera.Start(); 
CameraRunning = true; 
this.Numeric = mNumeric; 

startStopButton.Content = "Stop Camera"; 
} 
} 
private void SetGreyscaleOption() 
{ 
if(mGreyscale) 
Camera.SetOption(NP_OPTION_VIDEO_TYPE, 1); 
else 
Camera.SetOption(NP_OPTION_VIDEO_TYPE, 0); 
} 
private void SetOverlayOption() 
{ 
if(mOverlay) 
Camera.SetOption(NP_OPTION_TEXT_OVERLAY_OPTION, 255); 
else 
Camera.SetOption(NP_OPTION_TEXT_OVERLAY_OPTION, 0); 
} 

public void StopCamera() 
{ 
if (Camera != null) 
{ 
Camera.Stop(); 
timer1.Stop(); 
CameraRunning = false; 
Camera.FrameAvailable -= FrameAvailable; 
Camera.SetOption(NP_OPTION_NUMERIC_DISPLAY_OFF, 0); 
startStopButton.Content = "Start Camera"; 
} 
} 

private void greyscaleButton_Click(object sender, RoutedEventArgs e) 
{ 
if(mGreyscale) 
mGreyscale = false; 
else 
mGreyscale = true; 
SetGreyscaleOption(); 
} 

private void OverlayButton_Click(object sender, RoutedEventArgs e) 
{ 
if(mOverlay) 
mOverlay = false; 
else 
mOverlay = true; 
SetOverlayOption(); 
} 

private void exposureSlider_ValueChanged(object sender, RoutedEventArgs e) 
{ 
if (mCamera!=null) 
{ 
mCamera.SetOption(NP_OPTION_EXPOSURE, (int) this.exposureSlider.Value); 
} 
} 

private void thresholdSlider_ValueChanged(object sender, RoutedEventArgs e) 
{ 
if (mCamera != null) 
{ 
mCamera.SetOption(NP_OPTION_THRESHOLD, (int)this.thresholdSlider.Value); 
} 
} 

private void optionsButton_Click(object sender, RoutedEventArgs e) 
{ 
if (!propertyPanel.IsVisible) 
propertyPanel.Visibility = Visibility.Visible; 
else 
propertyPanel.Visibility = Visibility.Collapsed; 
} 
} 
} 

=== =============

"CameraView.xaml"

<UserControl 
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
x:Class="TestProject.CameraView" 
x:Name="CameraView1" 
Width="Auto" Height="Auto" 
xmlns:d="http://schemas.microsoft.com/expression/blend/2006" 
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
    mc:Ignorable="d" 
> 

<Grid x:Name="LayoutRoot" Width="Auto" Height="Auto"> 
    <Grid.Background> 
    <x:Null/> 
    </Grid.Background> 
    <Grid.ColumnDefinitions> 
    <ColumnDefinition Width="*"/> 
    <ColumnDefinition Width="113.904"/> 
    </Grid.ColumnDefinitions> 
    <Grid.RowDefinitions> 
    <RowDefinition Height="26.667"/> 
    <RowDefinition Height="*"/> 
    </Grid.RowDefinitions> 
    <Grid Margin="0,0,0,0" Grid.ColumnSpan="2"> 
    <Rectangle RadiusX="1.25" RadiusY="1.25" Margin="0,0,0,0" VerticalAlignment="Stretch"> 
    <Rectangle.Fill> 
    <LinearGradientBrush EndPoint="0.492,0.149" StartPoint="0.492,0.843"> 
     <GradientStop Color="#FF000000" Offset="0"/> 
     <GradientStop Color="#FF23283F" Offset="1"/> 
    </LinearGradientBrush> 
    </Rectangle.Fill> 
    <Rectangle.Stroke> 
    <LinearGradientBrush EndPoint="0.291,-4.231" StartPoint="1.668,18.025"> 
     <GradientStop Color="#FF000000" Offset="0"/> 
     <GradientStop Color="#FFFFFFFF" Offset="1"/> 
    </LinearGradientBrush> 
    </Rectangle.Stroke> 
    </Rectangle> 
    <Rectangle RadiusX="3.333" RadiusY="3.333" Opacity="0.13" Margin="0,0,0,13"> 
    <Rectangle.Fill> 
    <SolidColorBrush Color="#FFFFFFFF"/> 
    </Rectangle.Fill> 
    <Rectangle.Stroke> 
    <x:Null/> 
    </Rectangle.Stroke> 
    </Rectangle> 
    </Grid> 
    <Image Margin="0,0,0,0" x:Name="cameraImage" Grid.ColumnSpan="2" Grid.Row="1"/> 
    <Label x:Name="serialLabel" FontSize="10" FontWeight="Bold" Foreground="#FFDEDADA" Content="Camera 10024" HorizontalAlignment="Right" Margin="0,0,4,0" VerticalAlignment="Top" Grid.Column="1"> 
    <Label.BitmapEffect> 
    <OuterGlowBitmapEffect GlowColor="#FF000000" GlowSize="4" Opacity="0.7"/> 
    </Label.BitmapEffect> 
    </Label> 
    <WrapPanel Margin="3,3,3,3"> 
    <Button HorizontalAlignment="Stretch" Margin="0,0,0,0" x:Name="startStopButton" Width="100" Height="Auto" BorderThickness="0,0,0,0" Content="Start Camera" Click="startStopButton_Click"/> 
    <Button x:Name="optionsButton" Width="61.474" Height="Auto" BorderThickness="0,0,0,0" Content="Options" Click="optionsButton_Click"/> 
    </WrapPanel> 
    <Grid Visibility="Visible" d:LayoutOverrides="HorizontalAlignment, VerticalAlignment" HorizontalAlignment="Right" Margin="0,0,16,16" x:Name="propertyPanel" VerticalAlignment="Bottom" Width="169.237" Height="81.455" Grid.ColumnSpan="2" Grid.Row="1"> 
    <Rectangle Stroke="#FFFFFFFF" StrokeThickness="3" Margin="0,0,0,0"> 
    <Rectangle.BitmapEffect> 
    <DropShadowBitmapEffect/> 
    </Rectangle.BitmapEffect> 
    <Rectangle.Fill> 
    <LinearGradientBrush EndPoint="1,0.5" StartPoint="0,0.5"> 
     <GradientStop Color="#FF1E212F" Offset="0"/> 
     <GradientStop Color="#FF313551" Offset="1"/> 
    </LinearGradientBrush> 
    </Rectangle.Fill> 
    </Rectangle> 
    <Slider HorizontalAlignment="Stretch" Margin="62.633,5,4.681,0" x:Name="exposureSlider" VerticalAlignment="Top" Width="Auto" Height="Auto" Orientation="Horizontal" Maximum="255" ValueChanged="exposureSlider_ValueChanged"/> 
    <Label x:Name="serialLabel_Copy" FontSize="10" FontWeight="Bold" Foreground="#FFDEDADA" Content="Exposure" HorizontalAlignment="Left" Margin="3.853,3.853,0,0" VerticalAlignment="Top" Width="57.352"> 
    <Label.BitmapEffect> 
    <OuterGlowBitmapEffect GlowColor="#FF000000" GlowSize="4" Opacity="0.7"/> 
    </Label.BitmapEffect> 
    </Label> 
    <Label x:Name="serialLabel_Copy1" FontSize="10" FontWeight="Bold" Foreground="#FFDEDADA" Content="Threshold" d:LayoutOverrides="Height" HorizontalAlignment="Left" Margin="3.853,27.691,0,0" VerticalAlignment="Top" Width="59.829"> 
    <Label.BitmapEffect> 
    <OuterGlowBitmapEffect GlowColor="#FF000000" GlowSize="4" Opacity="0.7"/> 
    </Label.BitmapEffect> 
    </Label> 
    <Slider x:Name="thresholdSlider" Width="Auto" Orientation="Horizontal" Maximum="253" d:LayoutOverrides="Height, Margin" Margin="62.633,27.691,4.681,0" VerticalAlignment="Top" Minimum="54" Value="54" ValueChanged="thresholdSlider_ValueChanged"/> 
    <Button x:Name="greyScaleButton" Width="75.333" Content="Greyscale" Click="greyscaleButton_Click" HorizontalAlignment="Left" Height="21" d:LayoutOverrides="Height" Margin="8,53.761,0,0" VerticalAlignment="Top"/> 
    <Button x:Name="Overlay" Height="21" Content="Overlay" Click="OverlayButton_Click" d:LayoutOverrides="Height" HorizontalAlignment="Right" Margin="0,53.761,8,0" VerticalAlignment="Top" Width="64"/> 
    </Grid> 
</Grid> 
</UserControl> 

Answer 1

Właściwość Topmost istnieje w klasie okna: http://msdn.microsoft.com/en-us/library/system.windows.window.topmost.aspx.

Twoja klasa CameraView wywodzi się z UserControl, która jest rodzajem kontroli, która znajduje się wewnątrz okna (lub innego kontenera, takiego jak strona, ale to nie ma znaczenia tutaj). UserControl nie ma właściwości Topmost, ponieważ nie pojawia się niezależnie na pulpicie.

Host Twój CameraView w oknie i ustaw Window.Topmost:

<!-- MyWindow.xaml --> 
<Window ... 
     xmlns:local="clr-namespace:TestProject" 
     Topmost="True"> 
    <local:CameraView /> 
</Window> 

gdzie elipsy reprezentować domyślny gunk jak x:Class i WPF xmlns deklaracji, że Visual Studio tworzy dla Ciebie.

Answer 2

To jest UserControl. Można ustawić właściwość TopMost tylko dla systemu Windows:

Answer 3

Za pomocą kodu UserControl można uzyskać odwołanie do okna, które go hostuje, a następnie ustawić właściwość Topmost. Przykład:

Window parent = Window.GetWindow(this); 
parent.Topmost = true;