I guess since you're loading the UI dynamically, you'll need to either
go the "plugin" route or subclass QUiLoader.
https://forum.qt.io/topic/68045/can-t-load-custom-widget-using-quiloader
I'm not sure why you're using dynamic UI loading in the first place, or
how you expect any custom objects in such external UI files to be
available to the application... or if this is a one-time sort of issue.
My point being that you may be better off using plugins to being with,
since dynamically loading UI files has very limited functionality.
Cheers,
-Max
(Please reply to list, or directly, not both.)
On 5/3/2021 2:21 PM, Nicholas Yue wrote:
Thanks Max,
I tried the promotion approach and created the corresponding class
(which subclass from QOpenGLWidget) but when I ran the code, I can the
following message
```
"QFormBuilder was unable to create a custom widget of the class
'MyOpenGLWidget'; defaulting to base class 'QOpenGLWidget'."
```
The full source is here
https://github.com/nyue/QtQuestions/tree/main/Qt5/opengl/mainwindow
Cheers
On Sun, 2 May 2021 at 23:13, Max Paperno <ma...@wdg.us
<mailto:ma...@wdg.us>> wrote:
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
>
> _______________________________________________
> Interest mailing list
> Interest@qt-project.org <mailto:Interest@qt-project.org>
> https://lists.qt-project.org/listinfo/interest
>
_______________________________________________
Interest mailing list
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--
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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