Qt Reference Documentation

freezetablewidget.cpp Example File

itemviews/frozencolumn/freezetablewidget.cpp
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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());
 }
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