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<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Hi all,</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Following the recent thread on the MFC vtkMDI sample,
I am still not certain on the merits of using both SetParentId() & SetWindowId()
or just SetParentId().</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>If SetWindowId() is not used, vtk creates its
own window and replaces the WndProc() with </span></font><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>vtkHandleMessage().
Since MFC has not created this window (it has no CWnd derived object matching
the hWnd), all messages are routed directly to vtkHandleMessage(). CVtkMDIView::WindowProc()
is not required and will not capture messages handled by vtk. To get at these
messages, presumably, an observer can be added to the render window interactor.
However, the MFC created view coincident with the vtk window appears a redundant
overhead?</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>If SetWindowId() is used,</span></font><font size=2
face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial'> </span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>CVtkMDIView::WindowProc()
must be supplied to direct the messages to vtkHandleMessage2(). It would be
nice if this could be used without knowing what messages it should handle (as I
think Ingo is suggesting). There is the temptation to try to get vtk to draw
into any window style which may be unsuitable for OpenGL.</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Unfortunately, I am not an expert on MFC, VTK or OpenGL to
make any recommendation, and, indeed, the above diagnosis may be incorrect but
I think the cause is worthy.</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>All comments welcome.</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>John. </span></font></p>
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