[vtkusers] Qt Designer (5.10.1), QVTKOpenGLWidget, and sizepolicy questions

[Elvis Chen]

Hi,

Thank you very much.  The 2nd problem was indeed related to the layout. As for the 1st problem, I’ve tried to promote a widget but the “promote” button is always grayed-out in Qt Designer. I’ll have to look deeper into this issue.

Very much appreciated,

Regards,


--
Elvis C.S. Chen, PhD, LEL
 
Imaging, Robarts Research Institute
Department of Electrical and Computer Engineering
Biomedical Engineering
Medical Biophysics, Western University
London, Ontario, Canada


From: Elvis Stansvik
Sent: May 25, 2018 2:58 AM
To: Elvis Chen
Cc: VTK Users
Subject: Re: [vtkusers] Qt Designer (5.10.1), QVTKOpenGLWidget, and sizepolicy questions

Den tors 24 maj 2018 22:37Elvis Chen <elvis.chen at gmail.com> skrev:
Hi all,
 
I have 2 questions related to the integration of QVTKOpenGLWidget into Qt Designer and sizing policy, I seek your help.
 
First of, I’ve installed both 32/64-bits of Qt 5.10.1 onto my Windows 10 environment. I am using Visual Studio 2015 Enterprise edition, CMake 3.11.2, and vtk 9.0. Everything was compiled as 32bit application.
 
Question #1: 
 
In order to integrate QVTKOpenGLWidget into Qt Designer, I had to copy QVTKWidgetPlugin.dll/pdb into a path that’s accessible to Qt Designer. There is no QVTKOpenGLWidgetPlugin.* as far as I can tell. In Qt Designer, I do have access to QVTKWidget but not QVTKOpenGLWidget.
 
The generated .ui file hence contained QVTKWidget and I had to manually edit the .ui file to replace QVTKWidget with QVTKOpenGLWidget.
 
Is this the correct way of doing things?  Is manual editing required?

I believe you're right in that there's no designer plugin for QVTKOpenGLWidget.

What I usually do is insert a QOpenGLWidget in designer and the "promote" it to a QVTKOpenGLWidget. See http://doc.qt.io/qt-5/designer-using-custom-widgets.html#promoting-widgets

Manual editing should not be required.

 
Question #2:
 
I tried to follow VTK/Qt examples such as https://lorensen.github.io/VTKExamples/site/Cxx/Qt/ShareCameraQt/.  Suppose I have generated a Qt app based on QMainWindow, with a QWidget as the centralWidget and a QVTKOpenGLWidget on top of the centralWidget (as seen on the example above).  This was accomplished using Qt Designer and the resulting .ui file resembles to the example above.
 
While it works, I am having difficulties in setting up the size policy.  In short, no matter what sizePolicy I set to both (or either) the QWidget and QVTKOpenGLWidget, their sizes are fixed. If I maximize the window, the QVTKOpenGLWidget does not maximize.
 
Can anyone shed some light into this issue?  I can attach the .ui file if it is appropriate.

It sounds like you don't have a layout set on the centralWidget? Try setting it by selecting the centralWidget and using one of the layout buttons in the toolbars.

The containing widget must have a layout set for size policies to take effect.

HTH
Elvis
 
Any help is very much appreciated,
 
--
Elvis C.S. Chen, PhD, LEL
 
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