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Focus Management and mouse wheel hooking on WinForms by using WPF

Someone asked very interesting question in MSDN forums. I was sure, that that’s kind of “I forgot something small”, however, I built small repro.


public partial class Window1 : System.Windows.Window
{

public Window1()
{
InitializeComponent();
UserControl1 uc = new UserControl1();
WindowsFormsHost wfh = new WindowsFormsHost();
wfh.Child = (System.Windows.Forms.Control)uc;


((
Grid)this.Content).Children.Add(wfh);

}


public partial class UserControl1 : UserControl
{
public UserControl1()
{
InitializeComponent();
}

const int WM_MOUSEWHEEL = 0x20A;
protected override void WndProc(ref Message m)
{
base.WndProc(ref m);
if (m.Msg == WM_MOUSEWHEEL)
label1.Text = (
int)m.WParam > 0 ? “Scrolling up” : “Scrolling down”;
}

 

 

 

However, I noticed, that hosted WinForms control receives mouse notification only after it was clicked. What’s the ****, I thought. It was not reasonable for me, so I hooked into WindowsFormsHost.Loaded and UserControl.Load event to set focus manually by code. 



....uc.Load +=
new EventHandler(uc_Load);
....
wfh.Loaded += new RoutedEventHandler(wfh_Loaded);

void wfh_Loaded(object sender, RoutedEventArgs e)
{
FocusManager.SetFocusedElement((DependencyObject)sender, (IInputElement)sender);
}

void uc_Load(object sender, EventArgs e)
{
((
UserControl1)sender).Focus();

}
 

No effect. The user control inside WindowsFormsHost got not focus. Digging deeper, I found interesting article about focus management in WPF Interop application. So, using System.Windows.Interop.IKeyboardInputSink.TabInto(System.Windows.Input.TraversalRequest)  solves the problem. Just one line of code and Interop control, hosted in WPF got the focus, that it requests.

((System.Windows.Interop.IKeyboardInputSink)sender).TabInto(new System.Windows.Input.TraversalRequest(FocusNavigationDirection.First));

Well, next time, I advice to MSDN doc team, to write small bullet and link to such simple solution, that has to occur (as for me) automatically, when I set focus to WindowsFormsHost WPF element.

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15 Responses to “Focus Management and mouse wheel hooking on WinForms by using WPF”

  1. Vijay Says:

    I have solved my problems!

  2. Vijay Says:

    Tamir,

       Your this blog is helpful to understand this technology. I also stuck at similar situation where I need to Use WinForms inside WPF application and need to handle MouseWheel for WinForm. I am able to get the call back into WinForm implemention by echanism that you mentioned in your blog but now I need the event information such as event position i.e. like Point position = e.GetPosition(this); where e is MouseWheelEventArgs. But here, on mouseWheel controls come at "protected override void WndProc(ref System.Windows.Forms.Message m)", where MouseWheelEventArgs is missing.

    Any idea, how to get that?

  3. Blain Says:

    I have solved my problems!

    Thanks for your article!

    P.S. Do u want to see some magic ?

  4. Blain Says:

    I have done what mentioned above, but nothing works.

    Please send me full sources at pizdetsblya@gmail.com.

    I need help.

    Thank you in advance.

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