mainwindow.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
#include <QtWidgets>
 
#include "mainwindow.h"
 
MainWindow::MainWindow()
{
    QMenu *fileMenu = new QMenu(tr("&File"));
 
    QAction *quitAction = fileMenu->addAction(tr("E&xit"));
    quitAction->setShortcut(tr("Ctrl+Q"));
 
    QMenu *tableMenu = new QMenu(tr("&Table"));
 
    QAction *tableWidthAction = tableMenu->addAction(tr("Change Table &Width"));
    QAction *tableHeightAction = tableMenu->addAction(tr("Change Table &Height"));
 
    menuBar()->addMenu(fileMenu);
    menuBar()->addMenu(tableMenu);
 
//! [0]
    tableWidget = new QTableWidget(this);
//! [0]
    tableWidget->setSelectionMode(QAbstractItemView::ExtendedSelection);
 
    connect(quitAction, &QAction::triggered, this, &QWidget::close);
    connect(tableWidthAction, &QAction::triggered, this, &MainWindow::changeWidth);
    connect(tableHeightAction, &QAction::triggered, this, &MainWindow::changeHeight);
 
    setupTableItems();
 
    setCentralWidget(tableWidget);
    setWindowTitle(tr("Table Widget Resizing"));
}
 
void MainWindow::setupTableItems()
{
//! [1]
    tableWidget->setRowCount(10);
    tableWidget->setColumnCount(5);
//! [1]
 
    for (int row = 0; row < tableWidget->rowCount(); ++row) {
        for (int column = 0; column < tableWidget->columnCount(); ++column) {
//! [2]
    QTableWidgetItem *newItem = new QTableWidgetItem(tr("%1").arg(
        (row+1)*(column+1)));
    tableWidget->setItem(row, column, newItem);
//! [2]
        }
    }
}
 
void MainWindow::changeWidth()
{
    bool ok;
 
    int newWidth = QInputDialog::getInteger(this, tr("Change table width"),
        tr("Input the number of columns required (1-20):"),
        tableWidget->columnCount(), 1, 20, 1, &ok);
 
    if (ok)
        tableWidget->setColumnCount(newWidth);
}
 
void MainWindow::changeHeight()
{
    bool ok;
 
    int newHeight = QInputDialog::getInteger(this, tr("Change table height"),
        tr("Input the number of rows required (1-20):"),
        tableWidget->rowCount(), 1, 20, 1, &ok);
 
    if (ok)
        tableWidget->setRowCount(newHeight);
}