在WindowsFormsHost之上渲染WPF控件

时间:2011-05-12 13:42:27

标签: wpf windowsformshost

我知道默认的WPF行为是渲染WPF控件然后在顶部渲染WinForms,但有没有办法在WindowsFormsHost之上渲染WPF?

编辑:我也发现了一个临时黑客攻击。当wpf控件重叠WindowsFormsHost时,我会更改WindowsFormsHost的大小(这仅适用于重叠的矩形对象,不适用于其他形状。)

6 个答案:

答案 0 :(得分:7)

我知道这个晚会,但我最近使用WebBrowser控件遇到了这个问题。

最后一个修复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,我把它变成了一个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>

其中FixAirspace是从内容的“真实”视图切换到屏幕截图或“虚假”视图的依赖项属性。

答案 1 :(得分:6)

WPF vNext中的这个“空域”问题是suppose to be fixed。有一些解决方案,例如hereherehere

执行此操作的一种方法是将WPF内容托管在透明的Popup或Window中,该窗口覆盖Interop内容。

答案 2 :(得分:6)

这是到目前为止我在这个主题上看到的最佳答案的链接: Can I overlay a WPF window on top of another?

答案 3 :(得分:6)

尝试使用此尺寸:

<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;
    }
}

答案 4 :(得分:3)

如果有人发现自己对黑客不满意,将WindowsFormsHost的可见性设置为折叠或隐藏始终是一种选择。

答案 5 :(得分:0)

在将WinForms应用程序移植到WPF时,试图创建一个托管WinForms控件的MDI样式界面时遇到了这个问题。

我通过执行以下操作设法解决了这个问题: WindowsFormsHost-> ElementHost-> WindowsFormsHost->我的胜利表单控件。

它非常丑陋,但是它为WPF内容创建了Windows图层,使其位于WinForms内容之下。