qt5base-lts/examples/itemviews/frozencolumn/freezetablewidget.cpp

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#include <QtWidgets>

#include "freezetablewidget.h"

//! [constructor]
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)));


}
//! [constructor]

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

//! [init part1]
void FreezeTableWidget::init()
{
      frozenTableView->setModel(model());
      frozenTableView->setFocusPolicy(Qt::NoFocus);
      frozenTableView->verticalHeader()->hide();
      frozenTableView->horizontalHeader()->setResizeMode(QHeaderView::Fixed);

      viewport()->stackUnder(frozenTableView);
//! [init part1]

//! [init part2]
      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);
}
//! [init part2]


//! [sections]
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);
}
//! [sections]


//! [resize]
void FreezeTableWidget::resizeEvent(QResizeEvent * event)
{
      QTableView::resizeEvent(event);
      updateFrozenTableGeometry();
 }
//! [resize]


//! [navigate]
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;
}
//! [navigate]

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



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