How to make a confirm button for delete all rows operation of QTWidgets?

Question

Qt

I wanted to implement the function of deleting all rows in the database in my program, how to contact the main window through the confirmation window so that it deletes all rows?

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "warningwindow.h"
#include <QTableWidget>
#include <QMessageBox>
#include <QDialog>
#include <QWidget>
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    ui->tableWidget->setRowCount(6);
    ui->tableWidget->setColumnCount(7);
    int count=1;
    for(int i=0; i<ui->tableWidget->rowCount();i++) //строка
        for(int j=1;j<4;j++) //столбец
        {
            QTableWidgetItem *itm=new QTableWidgetItem(tr("%1").arg(count));
            ui->tableWidget->setItem(i,j,itm);
            count ++;
        }

    /*for  (int b=0; b<ui->tableWidget->rowCount();b++);
       for(int c=1;c<2;c++)
    {
    QTableWidgetItem *pl=new QTableWidgetItem(tr("%1").arg(count));

    }*/
}

MainWindow::~MainWindow()
{
    delete ui;

}
void MainWindow::on_pushButton_2_clicked()
{
   ui->tableWidget->insertRow( ui->tableWidget->rowCount() );
}

void MainWindow::on_pushButton_3_clicked()
{
   ui->tableWidget->removeRow(ui->tableWidget->currentRow());
}

void MainWindow::on_pushButton_clicked()
{
    ui->tableWidget->edit(ui->tableWidget->currentIndex());
}

void MainWindow::on_pushButton_4_clicked()
{
warningwindow window;
window.setModal(true);
window.exec();
    //ui->tableWidget->setRowCount(0);
}

#include "warningwindow.h"
#include "ui_warningwindow.h"
#include "mainwindow.h"
warningwindow::warningwindow(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::warningwindow)
{
    ui->setupUi(this);
}

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

void warningwindow::on_buttonBox_accepted()
{
}

void warningwindow::on_buttonBox_rejected()
{
    close();

}

Answer 1

You create a modal question dialog, then see what the user clicked (the result of the dialog) and execute the necessary code based on the result.
Is this what you need?