C++/Qt/QListView

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Int model for QListView

<source lang="cpp"> 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.
*
*/
  1. 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.
*
*/
  1. ifndef INTMODEL_H
  2. define INTMODEL_H
  3. include <QAbstractListModel>
  4. 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;

};

  1. 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.
*
*/
  1. include <QApplication>
  2. include <QListView>
  3. 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();

} 


 </source>


QListView demo and QStandardItem

<source lang="cpp"> 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.
*
*/
  1. include <QApplication>
  2. include <QSplitter>
  3. include <QTreeView>
  4. include <QListView>
  5. include <QTableView>
  6. 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();

} 


 </source>


QStringListModel and QStringList

<source lang="cpp">

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.
*
*/
  1. include <QApplication>
  2. include <QListView>
  3. 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();

} 


 </source>


Set view mode for QListView

<source lang="cpp">

  1. 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();

} 


 </source>
Источник — «http://cppe.ru/index.php?title=C%2B%2B/Qt/QListView&oldid=1261»