[vtkusers] Problem QVTKWidget using vtkCarbonRenderWindow instead of vtkCocoaRenderWindow

[Mike Jackson]

Qt 4.5 will be based on Cocoa (That is the current news from TT). Qt  
4.4 is CARBON based so you will have to build VTK using Carbon=ON if  
you want to use Qt. As far as supporting Cocoa/Qt in the future I am  
not sure if anyone has really looked at it yet. _IF_ TrollTech does  
deliver Qt/Cocoa for Qt 4.5 then the test is pretty simple. If the Qt  
Version is less than 4.5 then use Carbon. If it is 4.5 or above use  
Cocoa. This can be detected in CMake and set accordingly.

Q_WS_MAC is defined by Qt in its header files.


  _________________________________________________
| Mike Jackson - Principal Software Engineer      |
| BlueQuartz Software                             |
| mike.jackson at bluequartz.net                     |
| www.bluequartz.net                              |
---------------------------------------------------

On Sep 23, 2008, at 9:27 AM, Elvis Dowson wrote:

> Hi,
>         I just downloaded the latest vtk-5.x sources from cvs  
> (vtk-5.3) and tried to compile shared libraries, with
>
> Problem Outline
>
> VTK_USE_CARBON=OFF
> VTK_USE_COCOA=ON
> VTK_GUI_SUPPORT=ON
> VTK_USE_QVTK=ON
> DESIRED_QT_VERSION=4
>
> I am using qt-4.4.2 for mac os, which has support for Cocoa.
>
> Somehow, even through I have disabled support for Carbon, this error  
> comes up.
>
>   "vtkCarbonRenderWindow::UpdateGLRegion()", referenced from:
>       QVTKWidget::DirtyRegionProcessor(OpaqueEventHandlerCallRef*,  
> OpaqueEventRef*, void*)   in libQVTK.a(QVTKWidget.o)
>
> If I look at the file GUISupport/Qt/CMakeLists.cxx (what is this  
> file used for BTW?)
>
> I see the following implementation. Shouldn't it use  
> vtkCocoaRenderWindow instead?
>
> #if defined (Q_WS_MAC) && QT_VERSION >= 0x040000
> OSStatus QVTKWidget::DirtyRegionProcessor(EventHandlerCallRef,  
> EventRef event, void* wid)
> {
>   QVTKWidget* widget = reinterpret_cast<QVTKWidget*>(wid);
>   UInt32 event_kind = GetEventKind(event);
>   UInt32 event_class = GetEventClass(event);
>   if(event_class == 'cute' && event_kind == 20)
>     {
>     static_cast<vtkCarbonRenderWindow*>(widget->GetRenderWindow())- 
> >UpdateGLRegion();
>     }
>   return eventNotHandledErr;
> }
>
> #endif
>
>
> If I look at the file QVTKWidget.h
>
> there is no implementation for the case when qt version >= 4 and the  
> user selects the Cocoa libraries.
>
> #if defined(Q_WS_MAC) && QT_VERSION >= 0x040000
> #include <Carbon/Carbon.h>    // Event handling for dirty region
> #endif
>
> How can I go about trying to fix this?
>
> Where is Q_WS_MAC defined?
>
> General Question
>
> What should I do to make the modifications to support Cocoa for QVTK?
>
>
> Best regards,
>
> Elvis Dowson
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