在WindowsFormsHost之上渲染WPF控件

Question

我知道默认的WPF行为是渲染WPF控件然后在顶部呈现WinForms,但有没有办法在其上呈现WPF WindowsFormsHost？

编辑:我也发现了一个临时黑客.当wpf控件重叠时WindowsFormsHost,我改变了它的大小WindowsFormsHost(这只适用于有重叠的矩形对象,不适用于其他形状.)

Answer 1

这个"空域"问题假定在WPF vNext中修复.有一些解决方案,例如这里,这里和这里.

一种方法是将WPF内容托管在透明的Popup或Window中,它覆盖了Interop内容.

Answer 2

我知道,在派对上晚了,但我最近使用WebBrowser控件遇到了这个问题.

最后的解决方法是每当我在顶部托管模式对话框时创建Web浏览器的屏幕截图.由于这有点繁琐,我把它变成了Github项目,希望这有点帮助 -

https://github.com/chris84948/AirspaceFixer

(它也在Nuget上,在AirspaceFixer下)

一旦你有了项目,你需要做的就是这个

xmlns:asf="clr-namespace:AirspaceFixer;assembly=AirspaceFixer"

<asf:AirspacePanel FixAirspace="{Binding FixAirspace}">
    <WebBrowser x:Name="Browser" />
</asf:AirspacePanel>

FixAirspace从内容的"真实"视图切换到屏幕截图或"假"视图的依赖项属性在哪里.

Answer 3

这是到目前为止我在这个主题上看到的最佳答案的链接: 我可以将WPF窗口叠加在另一个上面吗？

Answer 4

试试这个尺码:

<hacks:AirspaceOverlay>
    <hacks:AirspaceOverlay.OverlayChild>
        <Canvas ToolTip = "A tooltip over a DirectX surface" Background="#01000000" Name="Overlay" />
    </hacks:AirspaceOverlay.OverlayChild>
    <controls:OpenGLControlWrappingWindowsFormsHost />
</hacks:AirspaceOverlay>


// Adapted from http://blogs.msdn.com/b/pantal/archive/2007/07/31/managed-directx-interop-with-wpf-part-2.aspx & http://www.4mghc.com/topics/69774/1/in-wpf-how-can-you-draw-a-line-over-a-windowsformshost
public class AirspaceOverlay : Decorator
{
    private readonly Window _transparentInputWindow;
    private Window _parentWindow;

    public AirspaceOverlay()
    {
        _transparentInputWindow = CreateTransparentWindow();
        _transparentInputWindow.PreviewMouseDown += TransparentInputWindow_PreviewMouseDown;
    }

    public object OverlayChild
    {
        get { return _transparentInputWindow.Content; }
        set { _transparentInputWindow.Content = value; }
    }

    private static Window CreateTransparentWindow()
    {
        var transparentInputWindow = new Window();

        //Make the window itself transparent, with no style.
        transparentInputWindow.Background = Brushes.Transparent;
        transparentInputWindow.AllowsTransparency = true;
        transparentInputWindow.WindowStyle = WindowStyle.None;

        //Hide from taskbar until it becomes a child
        transparentInputWindow.ShowInTaskbar = false;

        //HACK: This window and it's child controls should never have focus, as window styling of an invisible window 
        //will confuse user.
        transparentInputWindow.Focusable = false;

        return transparentInputWindow;
    }

    void TransparentInputWindow_PreviewMouseDown(object sender, MouseButtonEventArgs e)
    {
        _parentWindow.Focus();
    }

    protected override void OnRenderSizeChanged(SizeChangedInfo sizeInfo)
    {
        base.OnRenderSizeChanged(sizeInfo);
        UpdateOverlaySize();
    }

    protected override void OnRender(DrawingContext drawingContext)
    {
        base.OnRender(drawingContext);
        if (_transparentInputWindow.Visibility != Visibility.Visible)
        {
            UpdateOverlaySize();
            _transparentInputWindow.Show();
            _parentWindow = GetParentWindow(this);
            _transparentInputWindow.Owner = _parentWindow;
            _parentWindow.LocationChanged += ParentWindow_LocationChanged;
            _parentWindow.SizeChanged += ParentWindow_SizeChanged;
        }
    }

    private static Window GetParentWindow(DependencyObject o)
    {
        var parent = VisualTreeHelper.GetParent(o);
        if (parent != null)
            return GetParentWindow(parent);
        var fe = o as FrameworkElement;
        if (fe is Window)
            return fe as Window;
        if (fe != null && fe.Parent != null)
            return GetParentWindow(fe.Parent);  
        throw new ApplicationException("A window parent could not be found for " + o); 
    }

    private void ParentWindow_LocationChanged(object sender, EventArgs e)
    {
        UpdateOverlaySize();
    }

    private void ParentWindow_SizeChanged(object sender, SizeChangedEventArgs e)
    {
        UpdateOverlaySize();
    }

    private void UpdateOverlaySize()
    {
        var hostTopLeft = PointToScreen(new Point(0, 0));
        _transparentInputWindow.Left = hostTopLeft.X;
        _transparentInputWindow.Top = hostTopLeft.Y;
        _transparentInputWindow.Width = ActualWidth;
        _transparentInputWindow.Height = ActualHeight;
    }
}