Question

我需要通过Handle在其他窗口中托管我的WPF UserControl。我试过使用HwndSource：

var userControl = new MyUserControl();
var parameters = new HwndSourceParameters();
parameters.WindowStyle = 0x10000000 | 0x40000000;
parameters.SetPosition(5, 5);
parameters.SetSize(300, 300);
parameters.ParentWindow = parentWindowHwnd;
var src = new HwndSource(parameters);
src.RootVisual = userControl;

但在这种情况下，箭头和标签键不起作用。

如果我使用ElementHost，一切正常：

[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);

var userControl = new UserControl1();
var elementHost = new ElementHost();
elementHost.Child = userControl;
elementHost.Left = 5;
elementHost.Top = 5;
elementHost.Width = 300;
elementHost.Height = 300;

SetParent(elementHost.Handle, parentWindowHwnd);

如何使用HwndSource获得完整功能？

Answer 1

当您使用HwndSource时，您必须为Windows消息注册处理程序。

这可以通过电话来完成：

src.AddHook(this.messageHook);

钩子必须检查wm_getdlgcode消息。

    private IntPtr messageHook(IntPtr hwnd, int msg, IntPtr wparam, IntPtr lparam, ref bool handled)
    {
        switch (msg)
        {
            case WmGetDlgCode:
                {
                    handled = true;
                    return (IntPtr)(DlgcWantChars | DlgcWantTab | DlgcWantArrows | DlgcWantAllKeys);
                }
        }
        return IntPtr.Zero;
    }

通过Dlgc_WantChars，Dlgc_WantTab，Dlgc_WantArrows和Dlgc_WantAllKeys返回您需要的内容。

选中此消息和代码： http://msdn.microsoft.com/en-us/library/windows/desktop/ms645425(v=vs.85).aspx

    private const int WmGetDlgCode = 0x0087;

    private const int DlgcWantChars = 0x0080;

    private const int DlgcWantTab = 0x0002;

    private const int DlgcWantAllKeys = 0x0004;

    private const int DlgcWantArrows = 0x0001;

使用HwndSource在Win32应用程序中托管WPF UserControl

1 个答案: