Can’t Show Progress Bar Above QVTKOpenGLWidget On Windows

After upgrade vtk from 7.1.0 to 8.2.0, the old project shows a warning window about VTKWidget.
The newest vtk-qt program suggest me not to use old QVTKWidget anymore, so I rewrite my qt UI file
I have qt UI file as the following code snippet, a few widgets are put above QVTKOpenGLWidget.
The progress bar is at top level, you can read it from zorder information.

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>Widget</class>
 <widget class="QWidget" name="Widget">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>726</width>
    <height>458</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Widget</string>
  </property>
  <widget class="QVTKOpenGLWidget" name="qvtkWidget" native="true">
   <property name="geometry">
    <rect>
     <x>12</x>
     <y>12</y>
     <width>631</width>
     <height>411</height>
    </rect>
   </property>
  </widget>
  <widget class="QProgressBar" name="progressBar">
   <property name="geometry">
    <rect>
     <x>190</x>
     <y>210</y>
     <width>201</width>
     <height>31</height>
    </rect>
   </property>
   <property name="value">
    <number>24</number>
   </property>
  </widget>
  <widget class="QPushButton" name="pushButton_2">
   <property name="geometry">
    <rect>
     <x>480</x>
     <y>390</y>
     <width>112</width>
     <height>32</height>
    </rect>
   </property>
   <property name="text">
    <string>PushButton</string>
   </property>
  </widget>
  <widget class="QGroupBox" name="groupBox">
   <property name="geometry">
    <rect>
     <x>220</x>
     <y>290</y>
     <width>131</width>
     <height>111</height>
    </rect>
   </property>
   <property name="title">
    <string>GroupBox</string>
   </property>
   <widget class="QRadioButton" name="radioButton">
    <property name="geometry">
     <rect>
      <x>10</x>
      <y>30</y>
      <width>100</width>
      <height>20</height>
     </rect>
    </property>
    <property name="text">
     <string>RadioButton</string>
    </property>
   </widget>
   <widget class="QRadioButton" name="radioButton_2">
    <property name="geometry">
     <rect>
      <x>10</x>
      <y>80</y>
      <width>100</width>
      <height>20</height>
     </rect>
    </property>
    <property name="text">
     <string>RadioButton</string>
    </property>
   </widget>
  </widget>
  <widget class="QCheckBox" name="checkBox">
   <property name="geometry">
    <rect>
     <x>80</x>
     <y>360</y>
     <width>86</width>
     <height>20</height>
    </rect>
   </property>
   <property name="text">
    <string>CheckBox</string>
   </property>
  </widget>
  <widget class="QLineEdit" name="lineEdit">
   <property name="geometry">
    <rect>
     <x>40</x>
     <y>70</y>
     <width>113</width>
     <height>21</height>
    </rect>
   </property>
  </widget>
  <widget class="QTextEdit" name="textEdit">
   <property name="geometry">
    <rect>
     <x>340</x>
     <y>50</y>
     <width>104</width>
     <height>71</height>
    </rect>
   </property>
  </widget>
  <widget class="QTextEdit" name="textEdit_2">
   <property name="geometry">
    <rect>
     <x>50</x>
     <y>200</y>
     <width>104</width>
     <height>71</height>
    </rect>
   </property>
  </widget>
  <widget class="QPushButton" name="pushButton">
   <property name="geometry">
    <rect>
     <x>640</x>
     <y>10</y>
     <width>75</width>
     <height>32</height>
    </rect>
   </property>
   <property name="text">
    <string>Open</string>
   </property>
  </widget>
  <zorder>qvtkWidget</zorder>
  <zorder>pushButton_2</zorder>
  <zorder>groupBox</zorder>
  <zorder>checkBox</zorder>
  <zorder>lineEdit</zorder>
  <zorder>textEdit</zorder>
  <zorder>textEdit_2</zorder>
  <zorder>progressBar</zorder>
 </widget>
 <layoutdefault spacing="6" margin="11"/>
 <customwidgets>
  <customwidget>
   <class>QVTKOpenGLWidget</class>
   <extends>QWidget</extends>
   <header>QVTKOpenGLWidget.h</header>
  </customwidget>
 </customwidgets>
 <resources/>
 <connections/>
</ui>

The results on windows and mac os x are different with same code, the project had been uploaded to GitHub:
https://github.com/theArcticOcean/CLib/tree/master/VTKLearn/exploreProgressBar

The widgets above QVTKOpenGLWidget are invisible on windows, but they are normal on mac os x.
Relevant development environment on windows:
Qt 5.12.2 (MSVC 2017, 32 bit)
Qt Creator 4.9.0
VTK8.2.0

Maybe it’s a bug on windows in VTK8.2.0 and QT5.12.3.

Mac

Windows

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Christian

4 years ago

I can confirm the bug. I couldn’t find a solution to make it work with QVTKOpenGLWidget. But when using a QVTKOpenGLNativeWidget instead, the overlayed widgets will show up.