C++/Qt/QTableWidget

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Calculate the average and sum for QTableWidget

  
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef WINDOW_H
#define WINDOW_H
#include <QMainWindow>
class QAction;
class QTableWidget;
class QTableWidgetItem;
class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
    MainWindow();
public slots:
    void averageItems();
    void sumItems();
private:
    void setupTableItems();
    QAction *removeAction;
    QTableWidget *tableWidget;
};
#endif



#include <QtGui>
#include "math.h"
#include "mainwindow.h"
MainWindow::MainWindow()
{
    QMenu *fileMenu = new QMenu(tr("&File"));
    QAction *quitAction = fileMenu->addAction(tr("E&xit"));
    quitAction->setShortcut(tr("Ctrl+Q"));
    QMenu *itemsMenu = new QMenu(tr("&Items"));
    QAction *sumItemsAction = itemsMenu->addAction(tr("&Sum Items"));
    QAction *averageItemsAction = itemsMenu->addAction(tr("&Average Items"));
    menuBar()->addMenu(fileMenu);
    menuBar()->addMenu(itemsMenu);

    tableWidget = new QTableWidget(12, 3, this);
    tableWidget->setSelectionMode(QAbstractItemView::ExtendedSelection);

    QTableWidgetItem *valuesHeaderItem = new QTableWidgetItem(tr("Values"));
    tableWidget->setHorizontalHeaderItem(0, valuesHeaderItem);
    valuesHeaderItem->setTextAlignment(Qt::AlignVCenter);
    QTableWidgetItem *squaresHeaderItem = new QTableWidgetItem(tr("Squares"));
    squaresHeaderItem->setIcon(QIcon(QPixmap(":/Images/squared.png")));
    squaresHeaderItem->setTextAlignment(Qt::AlignVCenter);
    QTableWidgetItem *cubesHeaderItem = new QTableWidgetItem(tr("Cubes"));
    cubesHeaderItem->setIcon(QIcon(QPixmap(":/Images/cubed.png")));
    cubesHeaderItem->setTextAlignment(Qt::AlignVCenter);
    tableWidget->setHorizontalHeaderItem(1, squaresHeaderItem);
    tableWidget->setHorizontalHeaderItem(2, cubesHeaderItem);
    connect(quitAction, SIGNAL(triggered()), this, SLOT(close()));
    connect(sumItemsAction, SIGNAL(triggered()), this, SLOT(sumItems()));
    connect(averageItemsAction, SIGNAL(triggered()), this, SLOT(averageItems()));
    setupTableItems();
    setCentralWidget(tableWidget);
    setWindowTitle(tr("Table Widget"));
}
void MainWindow::setupTableItems()
{
    for (int row = 0; row < tableWidget->rowCount()-1; ++row) {
        for (int column = 0; column < tableWidget->columnCount(); ++column) {
    QTableWidgetItem *newItem = new QTableWidgetItem(tr("%1").arg(
        pow(row, column+1)));
    tableWidget->setItem(row, column, newItem);
        }
    }
    for (int column = 0; column < tableWidget->columnCount(); ++column) {
        QTableWidgetItem *newItem = new QTableWidgetItem;
        newItem->setFlags(Qt::ItemIsEnabled);
        tableWidget->setItem(tableWidget->rowCount()-1, column, newItem);
    }
}
void MainWindow::averageItems()
{
    QList<QTableWidgetItem *> selected = tableWidget->selectedItems();
    QTableWidgetItem *item;
    int number = 0;
    double total = 0;
    foreach (item, selected) {
        bool ok;
        double value = item->text().toDouble(&ok);
        
        if (ok && !item->text().isEmpty()) {
            total += value;
            number++;
        }
    }
    if (number > 0)
        tableWidget->currentItem()->setText(QString::number(total/number));
}
void MainWindow::sumItems()
{
    QList<QTableWidgetItem *> selected = tableWidget->selectedItems();
    QTableWidgetItem *item;
    int number = 0;
    double total = 0;
    foreach (item, selected) {
        bool ok;
        double value = item->text().toDouble(&ok);
        if (ok && !item->text().isEmpty()) {
            total += value;
            number++;
        }
    }
    if (number > 0)
        tableWidget->currentItem()->setText(QString::number(total));
}


#include <QtGui>
#include "mainwindow.h"
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    MainWindow *window = new MainWindow;
    window->show();
    return app.exec();
}


Creates a 3x3 table

  
#include <QtGui>
int main(int argc, char* argv[])
{
  QApplication app(argc, argv);
  QTableWidget tableWidget(3,3);
  for(introw=0;row<tableWidget.rowCount(); row++)
    for (int col=0;col<tableWidget.columnCount(); col++)
      tableWidget.setItem(row,col,new QTableWidgetItem(QString::number(row*col)));
  tableWidget.show();
  return app.exec();
}


QTableWidget and QTableWidgetItem

  
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef WINDOW_H
#define WINDOW_H
#include <QMainWindow>
class QAction;
class QTableWidget;
class QTableWidgetItem;
class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
    MainWindow();
public slots:
    void averageItems();
    void sumItems();
private:
    void setupTableItems();
    QAction *removeAction;
    QTableWidget *tableWidget;
};
#endif



#include <QtGui>
#include "math.h"
#include "mainwindow.h"
MainWindow::MainWindow()
{
    QMenu *fileMenu = new QMenu(tr("&File"));
    QAction *quitAction = fileMenu->addAction(tr("E&xit"));
    quitAction->setShortcut(tr("Ctrl+Q"));
    QMenu *itemsMenu = new QMenu(tr("&Items"));
    QAction *sumItemsAction = itemsMenu->addAction(tr("&Sum Items"));
    QAction *averageItemsAction = itemsMenu->addAction(tr("&Average Items"));
    menuBar()->addMenu(fileMenu);
    menuBar()->addMenu(itemsMenu);
    tableWidget = new QTableWidget(12, 3, this);
    tableWidget->setSelectionMode(QAbstractItemView::ExtendedSelection);
    tableWidget->setDragEnabled(true);
    tableWidget->setAcceptDrops(true);
    tableWidget->setDropIndicatorShown(true);
    QTableWidgetItem *valuesHeaderItem = new QTableWidgetItem(tr("Values"));
    tableWidget->setHorizontalHeaderItem(0, valuesHeaderItem);
    valuesHeaderItem->setTextAlignment(Qt::AlignVCenter);
    QTableWidgetItem *squaresHeaderItem = new QTableWidgetItem(tr("Squares"));
    squaresHeaderItem->setIcon(QIcon(QPixmap(":/Images/squared.png")));
    squaresHeaderItem->setTextAlignment(Qt::AlignVCenter);
    QTableWidgetItem *cubesHeaderItem = new QTableWidgetItem(tr("Cubes"));
    cubesHeaderItem->setIcon(QIcon(QPixmap(":/Images/cubed.png")));
    cubesHeaderItem->setTextAlignment(Qt::AlignVCenter);
    tableWidget->setHorizontalHeaderItem(1, squaresHeaderItem);
    tableWidget->setHorizontalHeaderItem(2, cubesHeaderItem);
    connect(quitAction, SIGNAL(triggered()), this, SLOT(close()));
    connect(sumItemsAction, SIGNAL(triggered()), this, SLOT(sumItems()));
    connect(averageItemsAction, SIGNAL(triggered()), this, SLOT(averageItems()));
    setupTableItems();
    setCentralWidget(tableWidget);
    setWindowTitle(tr("Table Widget"));
}
void MainWindow::setupTableItems()
{
    for (int row = 0; row < tableWidget->rowCount()-1; ++row) {
        for (int column = 0; column < tableWidget->columnCount(); ++column) {
    QTableWidgetItem *newItem = new QTableWidgetItem(tr("%1").arg(
        pow((float)row, (float)column+1)));
    tableWidget->setItem(row, column, newItem);
        }
    }
    for (int column = 0; column < tableWidget->columnCount(); ++column) {
        QTableWidgetItem *newItem = new QTableWidgetItem;
        newItem->setFlags(Qt::ItemIsEnabled | Qt::ItemIsUserCheckable);
        tableWidget->setItem(tableWidget->rowCount()-1, column, newItem);
    }
}
void MainWindow::averageItems()
{
    QList<QTableWidgetItem *> selected = tableWidget->selectedItems();
    QTableWidgetItem *item;
    int number = 0;
    double total = 0;
    foreach (item, selected) {
        bool ok;
        double value = item->text().toDouble(&ok);
        
        if (ok && !item->text().isEmpty()) {
            total += value;
            number++;
        }
    }
    if (number > 0)
        tableWidget->currentItem()->setText(QString::number(total/number));
}
void MainWindow::sumItems()
{
    QList<QTableWidgetItem *> selected = tableWidget->selectedItems();
    QTableWidgetItem *item;
    int number = 0;
    double total = 0;
    foreach (item, selected) {
        bool ok;
        double value = item->text().toDouble(&ok);
        if (ok && !item->text().isEmpty()) {
            total += value;
            number++;
        }
    }
    if (number > 0)
        tableWidget->currentItem()->setText(QString::number(total));
}



#include <QtGui>
#include "mainwindow.h"
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    MainWindow *window = new MainWindow;
    window->show();
    return app.exec();
}


Resize QTableWidget

  

/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef WINDOW_H
#define WINDOW_H
#include <QMainWindow>
class QAction;
class QTableWidget;
class QTableWidgetItem;
class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
    MainWindow();
public slots:
    void changeHeight();
    void changeWidth();
private:
    void setupTableItems();
    QTableWidget *tableWidget;
};
#endif



#include <QtGui>
#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);

    tableWidget = new QTableWidget(this);
    tableWidget->setSelectionMode(QAbstractItemView::ExtendedSelection);
    connect(quitAction, SIGNAL(triggered()), this, SLOT(close()));
    connect(tableWidthAction, SIGNAL(triggered()), this, SLOT(changeWidth()));
    connect(tableHeightAction, SIGNAL(triggered()), this, SLOT(changeHeight()));
    setupTableItems();
    setCentralWidget(tableWidget);
    setWindowTitle(tr("Table Widget Resizing"));
}
void MainWindow::setupTableItems()
{
    tableWidget->setRowCount(10);
    tableWidget->setColumnCount(5);

    for (int row = 0; row < tableWidget->rowCount(); ++row) {
        for (int column = 0; column < tableWidget->columnCount(); ++column) {
    QTableWidgetItem *newItem = new QTableWidgetItem(tr("%1").arg(
        (row+1)*(column+1)));
    tableWidget->setItem(row, column, newItem);
        }
    }
}
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);
}



#include <QtGui>
#include "mainwindow.h"
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    MainWindow *window = new MainWindow;
    window->show();
    return app.exec();
}