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Установка окна XAML всегда сверху (но не свойство TopMost)

Я разрабатываю приложение на основе OptiTrack SDK (из NaturalPoint). Мне нужно запустить окно приложения как "Always on Top". Окно спроектировано в XAML и контролируется в классе "CameraView", но, похоже, оно не включает свойство "TopMost" или эквивалент. Прикреплены код "CameraView.xaml.cs" и код "CameraView.xaml", которые являются частью OptiTrack SDK (NaturalPoint) под названием "Single_Camera_CSharp_.NET_3.0".

Можно было бы ожидать, что класс CameraView будет содержать свойства или члены, чтобы установить положение окна на экране или установить его в TopMost, но насколько я искал, я ничего не нашел. Интересно, что я должен делать.

Спасибо, 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>
4b9b3361

ОТВЕТЫ

Ответ 1

Свойство Topmost существует в классе Window: http://msdn.microsoft.com/en-us/library/system.windows.window.topmost.aspx.

Ваш класс CameraView получен из UserControl, который является видом элемента управления, который находится внутри окна (или другого контейнера, такого как страница, но это не важно здесь). UserControl не имеет свойства Topmost, потому что он не отображается независимо на рабочем столе.

Расположите свой CameraView в окне и установите Window.Topmost:

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

где эллипсы представляют собой стандартную марку gunk, например, x:Class и WPF xmlns, которые Visual Studio создает для вас.

Ответ 2

В коде UserControl позади вы можете получить ссылку на окно, в котором оно размещено, а затем установить свойство Topmost. Пример,

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

Ответ 3

Это UserControl. Вы можете установить свойство TopMost только для Windows