i_qtableview.h

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#ifndef i_qtableview_h
#define i_qtableview_h
 
/*+
________________________________________________________________________
 
 (C) dGB Beheer B.V.; (LICENSE) http://opendtect.org/OpendTect_license.txt
 Author:        Nanne Hemstra
 Date:          August 2020
________________________________________________________________________
 
 Inspired by Qt's Frozen Column Example
 https://doc.qt.io/qt-5/qtwidgets-itemviews-frozencolumn-example.html
-*/
 
#include <QTableView>
#include <QScrollBar>
#include <QHeaderView>
 
QT_BEGIN_NAMESPACE
 
class FrozenColumnsHelper : public QObject
{
    Q_OBJECT
    friend class ODTableView;
 
protected:
FrozenColumnsHelper( QTableView* mainview, QTableView* frozenview )
    : mainview_(mainview)
    , frozenview_(frozenview)
    , nrcols_(1)
{
    connect( mainview_->horizontalHeader(), &QHeaderView::sectionResized,
             this, &FrozenColumnsHelper::columnResized );
    connect( mainview_->verticalHeader(), &QHeaderView::sectionResized,
             this, &FrozenColumnsHelper::rowResized );
 
    connect( frozenview_->verticalScrollBar(), &QAbstractSlider::valueChanged,
             mainview_->verticalScrollBar(), &QAbstractSlider::setValue );
    connect( mainview_->verticalScrollBar(), &QAbstractSlider::valueChanged,
             frozenview_->verticalScrollBar(), &QAbstractSlider::setValue );
}
 
 
void setNrColumns( int nrcol )
{ nrcols_ = nrcol; }
 
 
void updateGeom()
{
    const int posx =
        mainview_->verticalHeader()->width() + mainview_->frameWidth();
    const int posy = mainview_->frameWidth();
    int viewwidth = 0;
    for ( int col=0; col<nrcols_; col++ )
        viewwidth += mainview_->columnWidth( col );
 
    const int viewheight = mainview_->viewport()->height() +
                           mainview_->horizontalHeader()->height();
    frozenview_->setGeometry( posx, posy, viewwidth-1, viewheight );
}
 
    QTableView*         mainview_;      // main table
    QTableView*         frozenview_;    // frozen column(s)
    int                 nrcols_;        // nr of frozen columns
 
private slots:
void columnResized( int col, int oldwidth, int newwidth )
{
    if ( col >= nrcols_ )
        return;
 
    frozenview_->setColumnWidth( col, newwidth );
    updateGeom();
}
 
 
void rowResized( int row, int oldheight, int newheight )
{
    frozenview_->setRowHeight( row, newheight );
}
 
};
 
#endif