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==Subclass QAbstractItemView==

<source lang="cpp">

Foundations of Qt Development\Chapter05\singleitemview\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 <QTableView>
#include <QStandardItemModel>
#include "singleitemview.h"
int main( int argc, char **argv )
{
QApplication app( argc, argv );

QTableView *table = new QTableView();
SingleItemView *selectionView = new SingleItemView();

QSplitter splitter;
splitter.addWidget( table );
splitter.addWidget( selectionView );
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) );
model.setItem(r, c, item);
}
table->setModel( &model );
selectionView->setModel( &model );
selectionView->setSelectionModel( table->selectionModel() );
splitter.show();

return app.exec();
}

Foundations of Qt Development\Chapter05\singleitemview\singleitemview.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 <QScrollBar>
#include <QGridLayout>
#include <QLabel>
#include "singleitemview.h"
SingleItemView::SingleItemView( QWidget *parent ) : QAbstractItemView( parent )
{
QGridLayout *layout = new QGridLayout( this->viewport() );
label = new QLabel();
layout->addWidget( label, 0, 0 );

label->setAlignment( Qt::AlignCenter );
label->setSizePolicy( QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding ) );
label->setText( tr("No data.") );
}

QRect SingleItemView::visualRect( const QModelIndex &index ) const
{
if( selectionModel()->selection().indexes().count() != 1 )
return QRect();

if( currentIndex() != index )
return QRect();

return rect();
}
QRegion SingleItemView::visualRegionForSelection( const QItemSelection &selection ) const
{
if( selection.indexes().count() != 1 )
return QRect();

if( currentIndex() != selection.indexes()[0] )
return QRect();

return rect();
}
bool SingleItemView::isIndexHidden( const QModelIndex &index ) const
{
if( selectionModel()->selection().indexes().count() != 1 )
return true;

if( currentIndex() != index )
return true;

return false;
}
QModelIndex SingleItemView::indexAt( const QPoint &point ) const
{
if( selectionModel()->selection().indexes().count() != 1 )
return QModelIndex();

return currentIndex();
}
int SingleItemView::horizontalOffset() const
{
return horizontalScrollBar()->value();
}
int SingleItemView::verticalOffset() const
{
return verticalScrollBar()->value();
}
QModelIndex SingleItemView::moveCursor( CursorAction cursorAction, Qt::KeyboardModifiers modifiers )
{
return currentIndex();
}
void SingleItemView::setSelection( const QRect &rect, QItemSelectionModel::SelectionFlags flags )
{
// do nothing
}
void SingleItemView::scrollTo( const QModelIndex &index, ScrollHint hint )
{
// cannot scroll
}
void SingleItemView::dataChanged( const QModelIndex &topLeft, const QModelIndex &bottomRight )
{
updateText();
}
void SingleItemView::selectionChanged( const QItemSelection &selected, const QItemSelection &deselected )
{
updateText();
}
void SingleItemView::updateText()
{
switch( selectionModel()->selection().indexes().count() )
{
case 0:
label->setText( tr("No data.") );
break;

case 1:
label->setText( model()->data( currentIndex() ).toString() );
break;

default:
label->setText( tr("Too many items selected. Can only show one item at a time.") );
break;
}
}

Foundations of Qt Development\Chapter05\singleitemview\singleitemview.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 SINGLEITEMVIEW_H
#define SINGLEITEMVIEW_H
#include <QAbstractItemView>
class QLabel;
class SingleItemView : public QAbstractItemView
{
Q_OBJECT

public:
SingleItemView( QWidget *parent = 0 );

QModelIndex indexAt( const QPoint &point ) const;
void scrollTo( const QModelIndex &index, ScrollHint hint = EnsureVisible );
QRect visualRect( const QModelIndex &index ) const;
protected:
int horizontalOffset() const;
bool isIndexHidden( const QModelIndex &index ) const;
QModelIndex moveCursor( CursorAction cursorAction, Qt::KeyboardModifiers modifiers );
void setSelection( const QRect &rect, QItemSelectionModel::SelectionFlags flags );
int verticalOffset() const;
QRegion visualRegionForSelection( const QItemSelection &selection ) const;

protected slots:
void dataChanged( const QModelIndex &topLeft, const QModelIndex &bottomRight );
void selectionChanged( const QItemSelection &selected, const QItemSelection &deselected );

private:
void updateText();

QLabel *label;
};
#endif // SINGLEITEMVIEW_H

</source>

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