设置XAML窗口始终位于顶部（但不包含TopMost属性）

Question

我正在开发基于OptiTrack SDK（来自NaturalPoint）的应用程序。我需要运行应用程序窗口为“永远在最前面”。该窗口在XAML中设计，并在“CameraView”类中进行控制，但似乎没有包含“TopMost”属性或等效属性。附加的是“CameraView.xaml.cs”的代码和“CameraView.xaml”的代码，它们是OptiTrack SDK（NaturalPoint）的一部分，名为“Single_Camera_CSharp_.NET_3.0”。

人们可以期望类CameraView包含属性或成员来设置屏幕上的窗口的位置或将其设置为TopMost，但只要搜索我什么也没找到。我想知道我该怎么做。

谢谢你，布莱恩

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

“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

在Window类上存在Topmost属性：http://msdn.microsoft.com/en-us/library/system.windows.window.topmost.aspx。

您的CameraView类是从UserControl派生而来的，它是一种位于Window（或其他容器，如Page的容器，但在此不重要）的控件。 UserControl没有Topmost属性，因为它不在桌面上独立显示。

主机你在一个窗口CameraView并设置Window.Topmost：

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

这里的省略号表示默认黏糊糊的像Visual Studio中创建您x:Class和WPF xmlns声明。

Answer 2

这是UserControl。您可以为Windows设置TopMost属性

Answer 3

在后面的UserControl代码中，您可以获取托管它的窗口的引用，然后设置Topmost属性。例如，

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