[vtkusers] Mouse wheel events not working under Win32?

[Charles Boivin]

Mathieu,

It's working now. You pointed me in the right direction with your
comment regarding passing all the mouse messages... It turns out that in
there is a function in the SDI example that needs to be modified:

LRESULT CVtkSDIView::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->iren->GetInitialized())
      {
        return vtkHandleMessage2(this->m_hWnd, message, wParam, lParam,
this->iren);
      }
      break;
  }
  
  return CView::WindowProc(message, wParam, lParam);
}


I added the "case WM_MOUSEWHEEL:" there. And then, of course,
vtkHandleMessage2() was able to receive the mouse wheel messages. 

I just checked, and the examples from CVS do NOT have that in there, so
that should probably be modified to avoid further problems with Windows
users... 

Thanks for your help,

Charles

>>> Mathieu Malaterre <mathieu.malaterre at kitware.com> 09/16/04 03:55pm
>>>
Charles,

	On Win32, I used to play with wxWindow/wxWidgets, so I don't
know about 
MFC. Did you try a google search, I found:

http://awc.al-williams.com/tips/tip26.htm 

	I bet this is something really simple to be done in the example
for the 
event to get passed.

I'll look into it tonite,
Mathieu

Charles Boivin wrote:
> Hi Mathieu, thanks for your reply.
> 
> In response to your questions:
> 
> a) Yes, the mouse wheel works fine in other windows apps. In fact,
it
> even works in the vtk debug window
> 
> b) There are no WM_MOUSEWHEEL messages being passed to
> vtkWin32RenderWindowInteractor::vtkHandleMessage2()
> 
> c) This is from a MFC app. In fact, it is from the VTK MFC SDI
sample
> application that I have modified a bit. Mind you, this is the SDI
> application from version 4.4. Would the one from the CVS version
pass
> all the mouse events? I am definitely NOT a MFC guru, so I am not
sure
> how I should go about this.
> 
> Thank you for your reply.
> 
> Charles
> 
> 
>>>>Mathieu Malaterre <mathieu.malaterre at kitware.com> 09/16/04 02:49pm
>>>>
> 
> Charles,
> 
> 	- Does your mouse wheel works in any other Windoze apps ?
> 
> 	- What happen in vtkHandleMessage2 
> (vtkWin32RenderWindowInteractor.cxx), if you put a breakpoint /
printf
> 
> stuff ?
> 
> 	- Are you using a simple vtkRWI window ? Or is it within your
> MFC app ? 
> If so make sure you are passing all mouse events.
> 
> HTH
> Mathieu
> 
> Charles Boivin wrote:
> 
>>Hello all,
>>
>>I have been trying to capture MouseWheel events in my own
>>InteractorStyle object without any success. I am using Visual Studio
>>.NET 2003 and the CVS version of VTK (CVS updated yesterday) on
> 
> Windows
> 
>>XP.
>>
>>I have been tracking down the events using the debugger and there
> 
> does
> 
>>not seem to be *any* calls made to
> 
> vtkInteractorStyle::ProcessEvents()
> 
>>that contain either MouseWheelForwardEvents or
> 
> MouseWheelBackwardEvents.
> 
>>This is *regardless* of the interactor style object that ends up
> 
> being
> 
>>used (my own, or the default one).
>>
>>I looked at the mailing list archives and it looked like this had
> 
> been
> 
>>implemented and was functional... am I missing something? Do I need
> 
> to
> 
>>set some macro to make sure that mouse wheel events are generated?
>>
>>Thank you,
>>
>>Charles Boivin
>>
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