Use QOpenGLWigdet in QGraphicsView, display will be displayed after hiding, update will not refresh

David Tang

The following is the constructor code that inherits the QGraphicsView class, using QOpenGLWidget:

M_scene = new QGraphicsScene( this );
setScene( m_scene );
setViewport(new QOpenGLWidget(this));

Call setHidden(true) in other Widgets, and then set to false, call update will not refresh

It is normal to not use opengl.

//setViewport(new QOpenGLWidget(this));

This problem will also appear on the PC and Android platforms, please help confirm what is the reason. Thank you!

SGaist

Hi and welcome to devnet,

What version of Qt are you using ?
What exact OS version are you running your application from ?
Can you provide a minimal compilable example that shows that behaviour ?

David Tang

Qt 5.12.2 (i386-little_endian-ilp32 shared (dynamic) release build; by MSVC 2017) on "windows"

OS: Windows 7 SP 1 (6.1) [winnt version 6.1.7601]

I am using an open source project, qflightinstruments-20180421, just modified to opengl way, I provide the entire project directly.

[0_1558000009369_src.zip](Uploading 100%)

In line 102 of qfi_PFD.cpp, setViewport uses openGLWidget, the following is part of the code

qfi_PFD::qfi_PFD( QWidget * parent ) :
QGraphicsView ( parent ),
......
{
Reset();

M_scene = new QGraphicsScene( this );
setScene( m_scene );

//use openGLwidget
setViewport(new QOpenGLWidget(this));

M_scene->clear();

......

Init();
}

In the 213 line of MainWindow.cpp, the update display, hidden and displayed in 222 lines per second, the following is part of the code

Void MainWindow::timerEvent( QTimerEvent *event )
{
    /////////////////////////////////////
    QMainWindow::timerEvent( event );
    /////////////////////////////////////

......

M_ui->widgetPFD->update();

Qint64 time2 = QDateTime::currentMSecsSinceEpoch();
    If( time2 - m_time1 > 1000 )
    {
        qDebug()<<m_time1<<time2<<m_steps;
        M_time1 = time2;
        M_steps = 0;
        M_ui->widgetPFD->setTestHidden();

}

The following are hidden and show functions
    Inline void setTestHidden()
    {
        setHidden(!isHidden());
    }

jsulm

@David-Tang You can't upload files here.
Upload it to some file sharing service and put the link here.