QMainWindow Open File dialog cut off and doesn't respond - c++

Question

My open file dialog in Qt5 is being cut off and it doesn't respond to any mouse clicks. I'm using an OpenGLWindow (per http://doc.qt.io/qt-5/qtgui-openglwindow-example.html) inside the central widget of the QMainWindow (per http://blog.qt.io/blog/2013/02/19/introducing-qwidgetcreatewindowcontainer/). If I don't set the central widget to my OpenGLWindow, then the open file dialog works, but once I use the OpenGLWindow in the central widget, then this problem occurs. See the screenshot below. Any ideas on how to fix this or debug it?
main.cpp:
...
QApplication app(argc, argv);
QSurfaceFormat format;
format.setSamples(16);
MainWindow mainWin;
MyOpenGLWindow window();
window.setFormat(format);
window.setAnimating(true);
QWidget *container = QWidget::createWindowContainer(&window);
mainWin.setCentralWidget(container);
#if defined(Q_OS_SYMBIAN)
mainWin.showMaximized();
#else
mainWin.show();
#endif
....
mainwindow.cpp:
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QFileDialog>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_actionOpen_File_triggered()
{
QString fileName = QFileDialog::getOpenFileName(this, tr("Open File"), "/home");
}
mainwindow.h:
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private:
Ui::MainWindow *ui;
private slots:
void on_actionOpen_File_triggered();
};
#endif // MAINWINDOW_H
mainwindow.ui:
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>MainWindow</class>
<widget class="QMainWindow" name="MainWindow">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>800</width>
<height>600</height>
</rect>
</property>
<property name="windowTitle">
<string>MainWindow</string>
</property>
<widget class="QWidget" name="centralwidget"/>
<widget class="QMenuBar" name="menubar">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>800</width>
<height>25</height>
</rect>
</property>
<widget class="QMenu" name="menuTest_Window">
<property name="title">
<string>File</string>
</property>
<addaction name="actionOpen_File"/>
</widget>
<addaction name="menuTest_Window"/>
</widget>
<widget class="QStatusBar" name="statusbar"/>
<action name="actionOpen_File">
<property name="text">
<string>Open File</string>
</property>
</action>
</widget>
<resources/>
<connections/>
</ui>

Answer 1

It seems that the way to solve this is to use an QOpenGLWidget (per https://blog.qt.io/blog/2014/09/10/qt-weekly-19-qopenglwidget/). The QWindow approach to using OpenGL doesn't seem to mix well with other QWidgets. I successfully transferred my application to use a QOpenGLWidget now and it works!