C++/Qt/QAbstractItemView — различия между версиями
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Версия 17:21, 25 мая 2010
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>