[vtkusers] MouseWheel and .NET

[Mathieu Malaterre]

Thanks for taking the time to report solution to the ML.

Mathieu

David Montgomery wrote:
> I verified that the focused .NET component consumes the WM_MOUSEWHEEL 
> message, and the VTK graphics window would not receive it. I worked 
> around this by simply overriding the following .NET method:
> 
> OnMouseWheel(MouseEventArgs e)
> 
> Using the value of e.Delta I directed this method to call the 
> appropriate MouseWheel method of the VTK interactor as follows:
> 
> if (forward) {
> 
> this->trackballCam->OnMouseWheelForward();
> 
> } else {
> 
> this->trackballCam->OnMouseWheelBackward();
> 
> }
> 
> 
> ------------------------------------------------------------------------
> *From:* Mathieu Malaterre [mailto:mathieu.malaterre at kitware.com]
> *Sent:* Wed 3/8/2006 5:11 PM
> *To:* David Montgomery
> *Cc:* vtkusers at vtk.org
> *Subject:* Re: [vtkusers] MouseWheel and .NET
> 
> David Montgomery wrote:
>  > In VTK 5.0.0 mouse wheel input zooms the trackball interactor as
>  > expected when I use a stand alone win32 window. When I parent the VTK
>  > graphics window to a .NET Windows Forms component (such as a panel), the
>  > mouse wheel input apparently gets consumed by a .NET component. Does
>  > anyone know a work-around or setting I should use to get the mouse wheel
>  > input to the VTK window?
> 
> Be sure to propagate the events down to VTK. Have a look at:
> 
>    VTK/Examples/GUI/Win32/SampleMFC/vtkMFCRenderView.cpp
> 
> ...
> // Define our own event handler here
> LRESULT vtkMFCRenderView::WindowProc(UINT message, WPARAM wParam, LPARAM
> lParam)
> {
>    switch (message)
>      {
>      //case WM_PAINT:
>      case WM_LBUTTONDOWN:
>      case WM_LBUTTONUP:
>      case WM_MBUTTONDOWN:
>      case WM_MBUTTONUP:
>      case WM_RBUTTONDOWN:
>      case WM_RBUTTONUP:
>      case WM_MOUSEMOVE:
>      case WM_MOUSEWHEEL:
>      case WM_CHAR:
>      case WM_TIMER:
>        if (this->Interactor->GetInitialized())
>          {
>          return vtkHandleMessage2(this->m_hWnd, message, wParam, lParam,
>                                   this->Interactor);
>          }
>        break;
>      }
>    return vtkMFCView::WindowProc(message, wParam, lParam);
> }
> ...
> 
> HTH
> Mathieu
>