[Interest] How to use QOpenGLWidget from Qt Creator

[Max Paperno]

Hi Nicholas,

What you want to do is create your custom QOpenGLWidget first (it could 
be the bare minimum to start with, even just a header file with the 
class declaration).  Then in Qt Creator/Designer you want to "promote" 
the placeholder QOpenGLWidget to your custom version.  If you search on 
"promote widget in Qt Designer" (or similar) you'll find more clues. 
Here's a couple links to get you started.

https://stackoverflow.com/questions/8138711/creating-custom-widget-to-be-promoted-in-qt-designer

https://doc.qt.io/archives/qt-4.8/designer-using-custom-widgets.html 
(see "Promoting Widgets" part).

Note that most customization to your widget won't actually show up in 
Designer (it will act as a "generic" QOpenGLWidget in Designer). Nor 
would any custom properties you create, etc. For that you'd need closer 
integration by writing a plugin (which you probably don't need to do).  See:

https://stackoverflow.com/questions/58714879/my-custom-widget-is-not-shown-in-qt-creator-qt-designer-but-it-is-shown-when-i

https://stackoverflow.com/questions/23275909/adding-widgets-to-qt-designer


HTH,
-Max


On 5/3/2021 1:12 AM, Nicholas Yue wrote:
> Hi,
> 
> I used designer to create a QOpenGLWidget on a MainWindow
> 
> I can retrieve the widget via findChild<QOpenGLWidget*>()
> 
> My understanding is that to leverage the widget, there are a couple of 
> virtual methods that needs to be overridden e.g. paintGL(), resizeGL(), 
> initializeGL()
> 
> However, the widget I retrieve via findChild() will be the base class 
> without the overridden methods.
> 
> I must be missing something here.
> 
> Where can I read up more on how this can be resolved ?
> 
> The OpenGL examples I found did not use Qt Creator to create the UI
> 
> https://doc.qt.io/qt-5/qtopengl-hellogl2-example.html
> 
> Cheers
> -- 
> Nicholas Yue
> Graphics - Arnold, Alembic, RenderMan, OpenGL, HDF5
> Custom Dev - C++ porting, OSX, Linux, Windows
> http://au.linkedin.com/in/nicholasyue
> https://vimeo.com/channels/naiadtools
> 
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