QListWidget: Insert items and remove items : QListWidget « Qt « C++

1. C++
2. Qt
3. QListWidget

QListWidget: Insert items and remove items

  
/****************************************************************************
**
** 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 QListWidget;
class QListWidgetItem;

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow();

public slots:
    void insertItem();
    void removeItem();
    void sortAscending();
    void sortDescending();
    void updateMenus(QListWidgetItem *current);

private:
    void setupListItems();

    QAction *insertAction;
    QAction *removeAction;
    QListWidget *listWidget;
};

#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 *itemsMenu = new QMenu(tr("&Items"));

    insertAction = itemsMenu->addAction(tr("&Insert Item"));
    removeAction = itemsMenu->addAction(tr("&Remove Item"));
    QAction *ascendingAction = itemsMenu->addAction(tr("Sort in &Ascending Order"));
    QAction *descendingAction = itemsMenu->addAction(tr("Sort in &Descending Order"));

    menuBar()->addMenu(fileMenu);
    menuBar()->addMenu(itemsMenu);

/*  For convenient quoting:

    QListWidget *listWidget = new QListWidget(this);

*/
    listWidget = new QListWidget(this);
    listWidget->setSelectionMode(QAbstractItemView::SingleSelection);

    connect(quitAction, SIGNAL(triggered()), this, SLOT(close()));
    connect(ascendingAction, SIGNAL(triggered()), this, SLOT(sortAscending()));
    connect(descendingAction, SIGNAL(triggered()), this, SLOT(sortDescending()));
    connect(insertAction, SIGNAL(triggered()), this, SLOT(insertItem()));
    connect(removeAction, SIGNAL(triggered()), this, SLOT(removeItem()));
    connect(listWidget,
            SIGNAL(currentItemChanged(QListWidgetItem *, QListWidgetItem *)),
            this, SLOT(updateMenus(QListWidgetItem *)));

    setupListItems();
    updateMenus(listWidget->currentItem());

    setCentralWidget(listWidget);
    setWindowTitle(tr("List Widget"));
}

void MainWindow::setupListItems()
{

    new QListWidgetItem(tr("Oak"), listWidget);
    new QListWidgetItem(tr("Fir"), listWidget);
    new QListWidgetItem(tr("Pine"), listWidget);

    new QListWidgetItem(tr("Birch"), listWidget);

    new QListWidgetItem(tr("Hazel"), listWidget);

    new QListWidgetItem(tr("Redwood"), listWidget);

    new QListWidgetItem(tr("Sycamore"), listWidget);
    new QListWidgetItem(tr("Chestnut"), listWidget);
    new QListWidgetItem(tr("Mahogany"), listWidget);

}

void MainWindow::sortAscending()
{

    listWidget->sortItems(Qt::AscendingOrder);

}

void MainWindow::sortDescending()
{

    listWidget->sortItems(Qt::DescendingOrder);

}

void MainWindow::insertItem()
{
    if (!listWidget->currentItem())
        return;

    QString itemText = QInputDialog::getText(this, tr("Insert Item"),
        tr("Input text for the new item:"));

    if (itemText.isNull())
        return;


    QListWidgetItem *newItem = new QListWidgetItem;
    newItem->setText(itemText);

    int row = listWidget->row(listWidget->currentItem());

    listWidget->insertItem(row, newItem);


    QString toolTipText = tr("Tooltip:") + itemText;
    QString statusTipText = tr("Status tip:") + itemText;
    QString whatsThisText = tr("What's This?:") + itemText;

    newItem->setToolTip(toolTipText);
    newItem->setStatusTip(toolTipText);
    newItem->setWhatsThis(whatsThisText);

}

void MainWindow::removeItem()
{
    listWidget->takeItem(listWidget->row(listWidget->currentItem()));
}

void MainWindow::updateMenus(QListWidgetItem *current)
{
    insertAction->setEnabled(current != 0);
    removeAction->setEnabled(current != 0);
}






#include <QtGui>

#include "mainwindow.h"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    MainWindow *window = new MainWindow;
    window->show();
    return app.exec();
}

   
    
  

Related examples in the same category