How to save documents when X-Button is pressed

[Michelle02283]

Hello,
my program should show a MessageBox with the question to save the progress. I tried to override the function closeEvent in my subclass from QWidget, but my programm closes without showing the QMessageBox.

[SGaist]

Hi,

Can you show your widget implementation ?

[Michelle02283]

This post is deleted!

[Michelle02283]

@SGaist

[SGaist]

What is AddAvailableFoodView ?

Note that pasting the code here between coding tags allows for easier reading and copy pasting to test which an image does not.

[mrdebug]

It is very easy!

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include "QCloseEvent"
#include "QMessageBox"

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

protected:
    void closeEvent(QCloseEvent *event) override;

private:
    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) {
    ui->setupUi(this);
}

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

void MainWindow::closeEvent(QCloseEvent *event) {
    switch (QMessageBox(tr("Warning!"), tr("Are you sure you want to exit without save?"), QMessageBox::Warning, QMessageBox::Yes | QMessageBox::Default, QMessageBox::No, QMessageBox::Escape).exec()) {
        case 3: {
            event->accept();
            break;
        }
        default: {
            event->ignore();
            break;
        }
    }
}

[Michelle02283]

@mrdebug But I have a subclass from QWidget. This function deosn´t show anything.

[Michelle02283]

void AddAvailableFoodView::closeEvent(QCloseEvent event)
{
QMessageBox saveOrNot = new QMessageBox();
QPushButton* save = new QPushButton();
saveOrNot->addButton(save);

}

I want that my programm saves my progress, if I push the "save" button

[Michelle02283]

class AddAvailableFoodView : public QWidget
{
Q_OBJECT
public:
explicit AddAvailableFoodView(ErrorModel* errorModel, QStackedWidget* stackedWidget, QStringList* widgets,
SearchModel* searchmodel, ManageModel* manageModel,
StackHistoryView* stackHistoryView, QWidget* parent = nullptr);
void createStartLayout(void);

protected:
virtual void closeEvent(QCloseEvent *event) override;

[SGaist]

closeEvent comes from Widget.

Take a look at the Main Window Example it shows what you want to achieve.

[Michelle02283]

@mrdebug why do you use the digit 3 in the switch?

[mr ZX]

@Michelle02283
use saving method in close event ,before accept event...
like this:

void MainWindow::closeEvent(QCloseEvent *event)
{
    QMessageBox::StandardButton res=QMessageBox::question(this,
                                                          "title","exit?",
                                                          QMessageBox::Yes|QMessageBox::No);
    if(res==QMessageBox::Yes)
    {
        qDebug()<<"exit: Yes";
        SaveFunc();//saveig method
        event->accept();//exit
    }
    else
    {
        event->ignore();
    }
}

void MainWindow::SaveFunc()
{
    qDebug()<<"saving";
    Sleep(3000);
    qDebug()<<"ok saved";
}

program after 3 second closing...