C++/Qt/QListView

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Int model for QListView

  
Foundations of Qt Development\Chapter05\editmodel\intmodel.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.
 *
 */
#include "intmodel.h"
IntModel::IntModel( int count, QObject *parent )
{
  for( int i=0; i<count; ++i )
    m_values << i+1;
}
Qt::ItemFlags IntModel::flags( const QModelIndex &index ) const
{
  return Qt::ItemIsSelectable | Qt::ItemIsEditable | Qt::ItemIsEnabled;
}
QVariant IntModel::data( const QModelIndex &index, int role ) const
{
  if( role != Qt::DisplayRole && role != Qt::EditRole )
    return QVariant();
    
  if( index.column() == 0 && index.row() < m_values.count() )
    return m_values.at( index.row() );
  else
    return QVariant();
}
int IntModel::rowCount( const QModelIndex &parent ) const
{
  return m_values.count();
}
bool IntModel::setData( const QModelIndex &index, const QVariant &value, int role )
{
  if( role != Qt::EditRole || index.column() != 0 || index.row() >= m_values.count() )
    return false;
    
  if( value.toInt() == m_values.at( index.row() ) )
    return false;
  m_values[ index.row() ] = value.toInt();
    
  emit dataChanged( index, index );
  return true;
}

Foundations of Qt Development\Chapter05\editmodel\intmodel.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.
 *
 */
#ifndef INTMODEL_H
#define INTMODEL_H
#include <QAbstractListModel>
#include <QList>
class IntModel : public QAbstractListModel
{
public:
  IntModel( int count, QObject *parent = 0 );
  
  Qt::ItemFlags flags( const QModelIndex &index ) const;
  QVariant data( const QModelIndex &index, int role = Qt::DisplayRole ) const;
  int rowCount( const QModelIndex &parent = QModelIndex() ) const;
  bool setData( const QModelIndex &index, const QVariant &value, int role = Qt::EditRole );
private:
  QList<int> m_values;
};
#endif // INTMODEL_H

Foundations of Qt Development\Chapter05\editmodel\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.
 *
 */
#include <QApplication>
#include <QListView>
#include "intmodel.h"
int main( int argc, char **argv )
{
  QApplication app( argc, argv );
  
  IntModel model( 25 );
  
  QListView list;
  list.setModel( &model );
  list.show();
  
  return app.exec();
}


QListView demo and QStandardItem

  
Foundations of Qt Development\Chapter05\readonlyview\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.
 *
 */
#include <QApplication>
#include <QSplitter>
#include <QTreeView>
#include <QListView>
#include <QTableView>
#include <QStandardItemModel>
int main( int argc, char **argv )
{
  QApplication app( argc, argv );
  
  QTreeView *tree = new QTreeView();
  QListView *list = new QListView();
  QTableView *table = new QTableView();
  
  QSplitter splitter;
  splitter.addWidget( tree );
  splitter.addWidget( list );
  splitter.addWidget( table );
  
  QStandardItemModel model( 5, 2 );
  for( int r=0; r<5; r++ ) 
    for( int c=0; c<2; c++) 
    {
      QStandardItem *item = new QStandardItem( QString("Row:%0, Column:%1").arg(r).arg(c) );
      
      if( c == 0 )
        for( int i=0; i<3; i++ )
        {
          QStandardItem *child = new QStandardItem( QString("Item %0").arg(i) );
          child->setEditable( false );
          item->appendRow( child );
        }
      
      model.setItem(r, c, item);
    }
  model.setHorizontalHeaderItem( 0, new QStandardItem( "Foo" ) );
  model.setHorizontalHeaderItem( 1, new QStandardItem( "Bar-Baz" ) );
  tree->setModel( &model );
  list->setModel( &model );
  table->setModel( &model );
  list->setSelectionModel( tree->selectionModel() );
  table->setSelectionModel( tree->selectionModel() );
  table->setSelectionBehavior( QAbstractItemView::SelectRows );
  table->setSelectionMode( QAbstractItemView::SingleSelection );
  splitter.show();
  
  return app.exec();
}


QStringListModel and QStringList

  

Foundations of Qt Development\Chapter05\stringlist\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.
 *
 */
#include <QApplication>
#include <QListView>
#include <QStringListModel>
int main( int argc, char **argv )
{
  QApplication app( argc, argv );
  QListView list;
  QStringListModel model;
  QStringList strings;
  
  strings << "foo" << "bar" << "baz";
  
  model.setStringList( strings );
  list.setModel( &model );
  list.show();
  
  return app.exec();
}


Set view mode for QListView

  

#include <QtGui>
int main(int argc, char* argv[]){
  QApplication app(argc, argv);
  QDirModel dirModel;
  QWidgetw;
  w.setWindowTitle(QObject::tr("Four directory views using one model"));
  QGridLayout *lay = new QGridLayout(&w);
  QListView *lv =new QListView;
  lay->addWidget(lv, 0, 0);
  lv->setModel(&dirModel);
  QListView *lvi = new QListView;
  lay->addWidget(lvi, 0, 1);
  lvi->setViewMode(QListView::IconMode);
  lvi->setModel(&dirModel);
  QTreeView *trv =new QTreeView;
  lay->addWidget(trv, 1, 0);
  trv->setModel(&dirModel);
  QTableView *tav =new QTableView;
  tav->setModel(&dirModel);
  lay->addWidget(tav, 1, 1);
  QModelIndex cwdIndex = dirModel.index(QDir::currentPath());
  lv->setRootIndex(cwdIndex);
  lvi->setRootIndex(cwdIndex);
  trv->setRootIndex(cwdIndex);
  tav->setRootIndex(cwdIndex);
  w.show();
  return app.exec();
}