freezetablewidget.cpp Example File

 /****************************************************************************
 **
 ** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** You may use this file under the terms of the BSD license as follows:
 **
 ** "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 Nokia Corporation and its Subsidiary(-ies) 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."
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include <QtGui>

 #include "freezetablewidget.h"

 FreezeTableWidget::FreezeTableWidget(QAbstractItemModel * model)
 {
       setModel(model);
       frozenTableView = new QTableView(this);

       init();

       //connect the headers and scrollbars of both tableviews together
       connect(horizontalHeader(),SIGNAL(sectionResized(int,int,int)), this,
               SLOT(updateSectionWidth(int,int,int)));
       connect(verticalHeader(),SIGNAL(sectionResized(int,int,int)), this,
               SLOT(updateSectionHeight(int,int,int)));

       connect(frozenTableView->verticalScrollBar(), SIGNAL(valueChanged(int)),
               verticalScrollBar(), SLOT(setValue(int)));
       connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
               frozenTableView->verticalScrollBar(), SLOT(setValue(int)));

 }

 FreezeTableWidget::~FreezeTableWidget()
 {
       delete frozenTableView;
 }

 void FreezeTableWidget::init()
 {
       frozenTableView->setModel(model());
       frozenTableView->setFocusPolicy(Qt::NoFocus);
       frozenTableView->verticalHeader()->hide();
       frozenTableView->horizontalHeader()->setResizeMode(QHeaderView::Fixed);

       viewport()->stackUnder(frozenTableView);

       frozenTableView->setStyleSheet("QTableView { border: none;"
                                      "background-color: #8EDE21;"
                                      "selection-background-color: #999}"); //for demo purposes
       frozenTableView->setSelectionModel(selectionModel());
       for(int col=1; col<model()->columnCount(); col++)
             frozenTableView->setColumnHidden(col, true);

       frozenTableView->setColumnWidth(0, columnWidth(0) );

       frozenTableView->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
       frozenTableView->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
       frozenTableView->show();

       updateFrozenTableGeometry();

       setHorizontalScrollMode(ScrollPerPixel);
       setVerticalScrollMode(ScrollPerPixel);
       frozenTableView->setVerticalScrollMode(ScrollPerPixel);
 }

 void FreezeTableWidget::updateSectionWidth(int logicalIndex, int, int newSize)
 {
       if(logicalIndex==0){
             frozenTableView->setColumnWidth(0,newSize);
             updateFrozenTableGeometry();
       }
 }

 void FreezeTableWidget::updateSectionHeight(int logicalIndex, int, int newSize)
 {
       frozenTableView->setRowHeight(logicalIndex, newSize);
 }

 void FreezeTableWidget::resizeEvent(QResizeEvent * event)
 {
       QTableView::resizeEvent(event);
       updateFrozenTableGeometry();
  }

 QModelIndex FreezeTableWidget::moveCursor(CursorAction cursorAction,
                                           Qt::KeyboardModifiers modifiers)
 {
       QModelIndex current = QTableView::moveCursor(cursorAction, modifiers);

       if(cursorAction == MoveLeft && current.column()>0
          && visualRect(current).topLeft().x() < frozenTableView->columnWidth(0) ){

             const int newValue = horizontalScrollBar()->value() + visualRect(current).topLeft().x()
                                  - frozenTableView->columnWidth(0);
             horizontalScrollBar()->setValue(newValue);
       }
       return current;
 }

 void FreezeTableWidget::scrollTo (const QModelIndex & index, ScrollHint hint){
     if(index.column()>0)
         QTableView::scrollTo(index, hint);
 }

 void FreezeTableWidget::updateFrozenTableGeometry()
 {
       frozenTableView->setGeometry( verticalHeader()->width()+frameWidth(),
                                     frameWidth(), columnWidth(0),
                                     viewport()->height()+horizontalHeader()->height());
 }