QCombobox causes updating problem

[wohehe]

Hello everyone！
I am using Qt on ARM-64 embedded system，my qt version is v5.11.3，my problem is when I use a QCombobox in a graphicView and click it，everything seems ok. But when I want to close the graphicview，the page can not update itself.By the way, if I use update(),the page will refresh. I just wonder why.
Hope for reply!

My code is

mainWindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QGraphicsView>
#include <QGraphicsProxyWidget>
#include "ui/custom_optionui.h"
#include <QTimer>

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();
    customOptionUi * subWin_1;
    QGraphicsView *view_1;

private slots:

    void on_pushButton_2_clicked();
    void view_close_1();

private:
    Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H```

mainWindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "ui_optionui.h"
#include "ui/custom_optionui.h"
#include <QTimer>
#include <QDebug>
#include <QAbstractItemView>

static void ui_rotate_1(MainWindow *mainWin, optionUi *subWin, int angle_z)
{
    QGraphicsScene *scene = new QGraphicsScene;
    QGraphicsProxyWidget *graph = scene->addWidget(subWin);
    graph->setRotation(angle_z);
    mainWin->view_1 = new QGraphicsView(scene);
    mainWin->view_1->setGeometry(0, 0, 720, 1280);
    mainWin->view_1->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    mainWin->view_1->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    mainWin->view_1->setAttribute(Qt::WA_TranslucentBackground,true);
    mainWin->view_1->setStyleSheet("background-color:transparent");
}

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    subWin_1 = new customOptionUi();
    ui_rotate_1(this, subWin_1, 90);
    view_1->hide();
    connect(timer,SIGNAL(timeout()),this,SLOT(timerout_code()));
    connect(subWin_1->ui->closeButton,SIGNAL(clicked()),this,SLOT(view_close_1()));
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_pushButton_2_clicked()
{
    view_1->show();
}

void MainWindow::view_close_1()
{
    view_1->close();

}

[SGaist]

Hi,

What do you mean by "the page can not update" ?

[wohehe]

Thanks for reply! The page is the screen on my embedded system. When this problem appears, the graphicsview still on the screen, just like it is not closed. But in fact, the graphicsview has been closed.

[SGaist]

What if you call hide rather than close ?

[wohehe]

@SGaist The problem stiil appears.

[SGaist]

Can you use a more recent version of Qt to see if it's still happening ?

[wohehe]

OK, I will use :) Thanks a lot.