C++/Qt/QListWidget

Adding one item to QListWidget

<source lang="cpp"> /*

* Copyright (c) 2006-2007, Johan Thelin
* 
* All rights reserved.
* 
* Redistribution and use in source and binary forms, with or without modification, 
* are permitted provided that the following conditions are met:
* 
*     * Redistributions of source code must retain the above copyright notice, 
*       this list of conditions and the following disclaimer.
*     * Redistributions in binary form must reproduce the above copyright notice,  
*       this list of conditions and the following disclaimer in the documentation 
*       and/or other materials provided with the distribution.
*     * Neither the name of APress nor the names of its contributors 
*       may be used to endorse or promote products derived from this software 
*       without specific prior written permission.
* 
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/

1. include "listwidgetdialog.h"
2. include <QListWidget>
3. include <QPushButton>
4. include <QGridLayout>

ListWidgetDialog::ListWidgetDialog() : QDialog(0) {

 QPushButton *left, *right;
 QGridLayout *layout = new QGridLayout( this );
 layout->addWidget( left = new QPushButton( "<<" ), 0, 1 );
 layout->addWidget( right = new QPushButton( ">>" ), 1, 1 );
 layout->addWidget( leftList = new QListWidget(), 0, 0, 3, 1 );
 layout->addWidget( rightList = new QListWidget(), 0, 2, 3, 1 );
 
 connect( left, SIGNAL(clicked()), this, SLOT(moveLeft()) );
 connect( right, SIGNAL(clicked()), this, SLOT(moveRight()) );
 QStringList items;
 items << "Argentine" << "Brazilian" << "South African" 
       << "USA West" << "Monaco" << "Belgian" << "Spanish" 
       << "Swedish" << "French" << "British" << "German" 
       << "Austrian" << "Dutch" << "Italian" << "USA East" 
       << "Canadian";  
 leftList->addItems( items );

}

void ListWidgetDialog::moveLeft() {

 if( rightList->selectedItems().count() != 1 )
   return;
   
 QListWidgetItem *item = rightList->takeItem( rightList->currentRow() );
 leftList->addItem( item );

} void ListWidgetDialog::moveRight() {

 if( leftList->selectedItems().count() != 1 )
   return;
   
 QListWidgetItem *item = leftList->takeItem( leftList->currentRow() );
 rightList->addItem( item );

}

Chapter03\listwidget\listwidgetdialog.h /*

* Copyright (c) 2006-2007, Johan Thelin
* 
* All rights reserved.
* 
* Redistribution and use in source and binary forms, with or without modification, 
* are permitted provided that the following conditions are met:
* 
*     * Redistributions of source code must retain the above copyright notice, 
*       this list of conditions and the following disclaimer.
*     * Redistributions in binary form must reproduce the above copyright notice,  
*       this list of conditions and the following disclaimer in the documentation 
*       and/or other materials provided with the distribution.
*     * Neither the name of APress nor the names of its contributors 
*       may be used to endorse or promote products derived from this software 
*       without specific prior written permission.
* 
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/

1. ifndef LISTWIDGETDIALOG_H
2. define LISTWIDGETDIALOG_H
3. include <QDialog>

class QListWidget; class ListWidgetDialog : public QDialog {

 Q_OBJECT
 

public:

 ListWidgetDialog();
 

public slots:

 void moveLeft();
 void moveRight();
 

private:

 QListWidget *leftList;
 QListWidget *rightList;

};

1. endif // LISTWIDGETDIALOG_H

Chapter03\listwidget\main.cpp /*

* Copyright (c) 2006-2007, Johan Thelin
* 
* All rights reserved.
* 
* Redistribution and use in source and binary forms, with or without modification, 
* are permitted provided that the following conditions are met:
* 
*     * Redistributions of source code must retain the above copyright notice, 
*       this list of conditions and the following disclaimer.
*     * Redistributions in binary form must reproduce the above copyright notice,  
*       this list of conditions and the following disclaimer in the documentation 
*       and/or other materials provided with the distribution.
*     * Neither the name of APress nor the names of its contributors 
*       may be used to endorse or promote products derived from this software 
*       without specific prior written permission.
* 
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/

1. include <QApplication>
2. include "listwidgetdialog.h"

int main( int argc, char **argv ) {

 QApplication app( argc, argv );
 
 ListWidgetDialog dlg;
 dlg.show();
 
 return app.exec();

}

 </source>

Get currentRow() from QListWidget

<source lang="cpp"> /*

* Copyright (c) 2006-2007, Johan Thelin
* 
* All rights reserved.
* 
* Redistribution and use in source and binary forms, with or without modification, 
* are permitted provided that the following conditions are met:
* 
*     * Redistributions of source code must retain the above copyright notice, 
*       this list of conditions and the following disclaimer.
*     * Redistributions in binary form must reproduce the above copyright notice,  
*       this list of conditions and the following disclaimer in the documentation 
*       and/or other materials provided with the distribution.
*     * Neither the name of APress nor the names of its contributors 
*       may be used to endorse or promote products derived from this software 
*       without specific prior written permission.
* 
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/

1. include "listwidgetdialog.h"
2. include <QListWidget>
3. include <QPushButton>
4. include <QGridLayout>

ListWidgetDialog::ListWidgetDialog() : QDialog(0) {

 QPushButton *left, *right;
 QGridLayout *layout = new QGridLayout( this );
 layout->addWidget( left = new QPushButton( "<<" ), 0, 1 );
 layout->addWidget( right = new QPushButton( ">>" ), 1, 1 );
 layout->addWidget( leftList = new QListWidget(), 0, 0, 3, 1 );
 layout->addWidget( rightList = new QListWidget(), 0, 2, 3, 1 );
 
 connect( left, SIGNAL(clicked()), this, SLOT(moveLeft()) );
 connect( right, SIGNAL(clicked()), this, SLOT(moveRight()) );
 QStringList items;
 items << "Argentine" << "Brazilian" << "South African" 
       << "USA West" << "Monaco" << "Belgian" << "Spanish" 
       << "Swedish" << "French" << "British" << "German" 
       << "Austrian" << "Dutch" << "Italian" << "USA East" 
       << "Canadian";  
 leftList->addItems( items );

}

void ListWidgetDialog::moveLeft() {

 if( rightList->selectedItems().count() != 1 )
   return;
   
 QListWidgetItem *item = rightList->takeItem( rightList->currentRow() );
 leftList->addItem( item );

} void ListWidgetDialog::moveRight() {

 if( leftList->selectedItems().count() != 1 )
   return;
   
 QListWidgetItem *item = leftList->takeItem( leftList->currentRow() );
 rightList->addItem( item );

}

Chapter03\listwidget\listwidgetdialog.h /*

* Copyright (c) 2006-2007, Johan Thelin
* 
* All rights reserved.
* 
* Redistribution and use in source and binary forms, with or without modification, 
* are permitted provided that the following conditions are met:
* 
*     * Redistributions of source code must retain the above copyright notice, 
*       this list of conditions and the following disclaimer.
*     * Redistributions in binary form must reproduce the above copyright notice,  
*       this list of conditions and the following disclaimer in the documentation 
*       and/or other materials provided with the distribution.
*     * Neither the name of APress nor the names of its contributors 
*       may be used to endorse or promote products derived from this software 
*       without specific prior written permission.
* 
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/

1. ifndef LISTWIDGETDIALOG_H
2. define LISTWIDGETDIALOG_H
3. include <QDialog>

class QListWidget; class ListWidgetDialog : public QDialog {

 Q_OBJECT
 

public:

 ListWidgetDialog();
 

public slots:

 void moveLeft();
 void moveRight();
 

private:

 QListWidget *leftList;
 QListWidget *rightList;

};

1. endif // LISTWIDGETDIALOG_H

Chapter03\listwidget\main.cpp /*

* Copyright (c) 2006-2007, Johan Thelin
* 
* All rights reserved.
* 
* Redistribution and use in source and binary forms, with or without modification, 
* are permitted provided that the following conditions are met:
* 
*     * Redistributions of source code must retain the above copyright notice, 
*       this list of conditions and the following disclaimer.
*     * Redistributions in binary form must reproduce the above copyright notice,  
*       this list of conditions and the following disclaimer in the documentation 
*       and/or other materials provided with the distribution.
*     * Neither the name of APress nor the names of its contributors 
*       may be used to endorse or promote products derived from this software 
*       without specific prior written permission.
* 
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/

1. include <QApplication>
2. include "listwidgetdialog.h"

int main( int argc, char **argv ) {

 QApplication app( argc, argv );
 
 ListWidgetDialog dlg;
 dlg.show();
 
 return app.exec();

}

 </source>

Get selected Items count from QListWidget

<source lang="cpp"> /*

* Copyright (c) 2006-2007, Johan Thelin
* 
* All rights reserved.
* 
* Redistribution and use in source and binary forms, with or without modification, 
* are permitted provided that the following conditions are met:
* 
*     * Redistributions of source code must retain the above copyright notice, 
*       this list of conditions and the following disclaimer.
*     * Redistributions in binary form must reproduce the above copyright notice,  
*       this list of conditions and the following disclaimer in the documentation 
*       and/or other materials provided with the distribution.
*     * Neither the name of APress nor the names of its contributors 
*       may be used to endorse or promote products derived from this software 
*       without specific prior written permission.
* 
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/

1. include "listwidgetdialog.h"
2. include <QListWidget>
3. include <QPushButton>
4. include <QGridLayout>

ListWidgetDialog::ListWidgetDialog() : QDialog(0) {

 QPushButton *left, *right;
 QGridLayout *layout = new QGridLayout( this );
 layout->addWidget( left = new QPushButton( "<<" ), 0, 1 );
 layout->addWidget( right = new QPushButton( ">>" ), 1, 1 );
 layout->addWidget( leftList = new QListWidget(), 0, 0, 3, 1 );
 layout->addWidget( rightList = new QListWidget(), 0, 2, 3, 1 );
 
 connect( left, SIGNAL(clicked()), this, SLOT(moveLeft()) );
 connect( right, SIGNAL(clicked()), this, SLOT(moveRight()) );
 QStringList items;
 items << "Argentine" << "Brazilian" << "South African" 
       << "USA West" << "Monaco" << "Belgian" << "Spanish" 
       << "Swedish" << "French" << "British" << "German" 
       << "Austrian" << "Dutch" << "Italian" << "USA East" 
       << "Canadian";  
 leftList->addItems( items );

}

void ListWidgetDialog::moveLeft() {

 if( rightList->selectedItems().count() != 1 )
   return;
   
 QListWidgetItem *item = rightList->takeItem( rightList->currentRow() );
 leftList->addItem( item );

} void ListWidgetDialog::moveRight() {

 if( leftList->selectedItems().count() != 1 )
   return;
   
 QListWidgetItem *item = leftList->takeItem( leftList->currentRow() );
 rightList->addItem( item );

}

Chapter03\listwidget\listwidgetdialog.h /*

* Copyright (c) 2006-2007, Johan Thelin
* 
* All rights reserved.
* 
* Redistribution and use in source and binary forms, with or without modification, 
* are permitted provided that the following conditions are met:
* 
*     * Redistributions of source code must retain the above copyright notice, 
*       this list of conditions and the following disclaimer.
*     * Redistributions in binary form must reproduce the above copyright notice,  
*       this list of conditions and the following disclaimer in the documentation 
*       and/or other materials provided with the distribution.
*     * Neither the name of APress nor the names of its contributors 
*       may be used to endorse or promote products derived from this software 
*       without specific prior written permission.
* 
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/

1. ifndef LISTWIDGETDIALOG_H
2. define LISTWIDGETDIALOG_H
3. include <QDialog>

class QListWidget; class ListWidgetDialog : public QDialog {

 Q_OBJECT
 

public:

 ListWidgetDialog();
 

public slots:

 void moveLeft();
 void moveRight();
 

private:

 QListWidget *leftList;
 QListWidget *rightList;

};

1. endif // LISTWIDGETDIALOG_H

Chapter03\listwidget\main.cpp /*

* Copyright (c) 2006-2007, Johan Thelin
* 
* All rights reserved.
* 
* Redistribution and use in source and binary forms, with or without modification, 
* are permitted provided that the following conditions are met:
* 
*     * Redistributions of source code must retain the above copyright notice, 
*       this list of conditions and the following disclaimer.
*     * Redistributions in binary form must reproduce the above copyright notice,  
*       this list of conditions and the following disclaimer in the documentation 
*       and/or other materials provided with the distribution.
*     * Neither the name of APress nor the names of its contributors 
*       may be used to endorse or promote products derived from this software 
*       without specific prior written permission.
* 
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/

1. include <QApplication>
2. include "listwidgetdialog.h"

int main( int argc, char **argv ) {

 QApplication app( argc, argv );
 
 ListWidgetDialog dlg;
 dlg.show();
 
 return app.exec();

}

 </source>

QListWidget drag and drop

<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.
  • $QT_END_LICENSE$
  • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • /

1. ifndef WINDOW_H
2. define WINDOW_H
3. include <QMainWindow>

class QListWidget; class QListWidgetItem; class MainWindow : public QMainWindow {

   Q_OBJECT

public:

   MainWindow();

private:

   void setupListItems();
   QListWidget *listWidget;

};

1. endif

1. include <QtGui>
2. include "mainwindow.h"

MainWindow::MainWindow() {

   QMenu *fileMenu = new QMenu(tr("&File"));
   QAction *quitAction = fileMenu->addAction(tr("E&xit"));
   quitAction->setShortcut(tr("Ctrl+Q"));
   menuBar()->addMenu(fileMenu);

// For convenient quoting: QListWidget *listWidget = new QListWidget(this); listWidget->setSelectionMode(QAbstractItemView::SingleSelection); listWidget->setDragEnabled(true); listWidget->viewport()->setAcceptDrops(true); listWidget->setDropIndicatorShown(true);

listWidget->setDragDropMode(QAbstractItemView::InternalMove);

   this->listWidget = listWidget;
   connect(quitAction, SIGNAL(triggered()), this, SLOT(close()));
   setupListItems();
   setCentralWidget(listWidget);
   setWindowTitle(tr("List Widget"));

} void MainWindow::setupListItems() {

   QListWidgetItem *item;
   item = new QListWidgetItem(tr("Oak"), listWidget);
   item = new QListWidgetItem(tr("Fir"), listWidget);
   item = new QListWidgetItem(tr("Pine"), listWidget);
   item = new QListWidgetItem(tr("Birch"), listWidget);
   item = new QListWidgetItem(tr("Hazel"), listWidget);
   item = new QListWidgetItem(tr("Redwood"), listWidget);
   item = new QListWidgetItem(tr("Sycamore"), listWidget);
   item = new QListWidgetItem(tr("Chestnut"), listWidget);
   item = new QListWidgetItem(tr("Mahogany"), listWidget);

}

1. include <QtGui>
2. include "mainwindow.h"

int main(int argc, char *argv[]) {

   QApplication app(argc, argv);
   MainWindow *window = new MainWindow;
   window->show();
   return app.exec();

}

 </source>

QListWidget: Insert items and remove items

<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.
  • $QT_END_LICENSE$
  • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • /

1. ifndef WINDOW_H
2. define WINDOW_H
3. 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;

};

1. endif

1. include <QtGui>
2. 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);

}

1. include <QtGui>
2. include "mainwindow.h"

int main(int argc, char *argv[]) {

   QApplication app(argc, argv);
   MainWindow *window = new MainWindow;
   window->show();
   return app.exec();

}

 </source>