в 14:21, 25 мая 2010

2010-05-25T14:21:06Z

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2010-05-25T10:24:38Z

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==Calculate the average and sum for QTableWidget==

<source lang="cpp">
/****************************************************************************
**
** 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();
}

</source>

==Creates a 3x3 table==

<source lang="cpp">
#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();
}

</source>

==QTableWidget and QTableWidgetItem==

<source lang="cpp">
/****************************************************************************
**
** 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();
}

</source>

==Resize QTableWidget==

<source lang="cpp">

/****************************************************************************
**
** 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();
}

</source>

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