Qt 4.8: freezetablewidget.cpp Example File (itemviews/frozencolumn/freezetablewidget.cpp)

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# freezetablewidget.cpp Example File

itemviews/frozencolumn/freezetablewidget.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2015 The Qt Company Ltd.
     ** Contact: http://www.qt.io/licensing/
     **
     ** 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.
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     **     contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
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     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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     #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());
     }