在WindowsFormsHost上呈现WPF控件

Question

我知道默认的WPF行为是呈现WPF控件，然后在WinForms顶部呈现WPF，但是有什么方法可以在WindowsFormsHost之上呈现WPF吗？

编辑：我也发现了一个临时黑客。当wpf控件与WindowsFormsHost重叠时，我会更改WindowsFormsHost的大小(只有当有重叠的矩形对象时才有效，对于其他形状则不起作用)。

Answer 1

这个“空域”问题是WPF vNext中的vNext。有几种解决方案，如这里、这里和这里。

一种方法是将WPF内容托管在一个透明的弹出窗口或窗口中，该窗口覆盖了Interop内容。

Answer 2

晚会晚了，我知道，但最近我用WebBrowser控件发现了这个问题。

最后的解决办法是，每当我在顶部托管一个模态对话框时，就创建一个web浏览器的屏幕截图。因为这有点微妙，我把它变成了一个吉特布项目，希望这能帮上一点忙-

https://github.com/chris84948/AirspaceFixer

(它也在Nuget上，在AirspaceFixer下)

一旦你有了这个项目，你需要做的就是

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

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

其中，FixAirspace是从内容的“真实”视图切换到屏幕快照或“假”视图的依赖属性。

Answer 3

试一试这个尺寸：

<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;
    }
}