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Thread: QTreeView and Column/Row Gridlines

  1. #1
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    Default QTreeView and Column/Row Gridlines

    I have seen this question asked before, but I did not quite see an answer that cleared it up for me. A QTreeView has rows and columns. Is there a way to draw gridlines so that each row and column is clearly outlined or just vertical lines to separate columns? I looked at Qt Designer and their Property Editor does this. Does creating a feature like this require reimplementing the drawRow function or is there a straight forward way to do this?

    Thanks in advance

  2. #2
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    Default Re: QTreeView and Column/Row Gridlines

    You could use a delegate
    Qt Code:
    1. class GridDelegate : public QStyledItemDelegate
    2. {
    3. public:
    4. explicit GridDelegate(QObject * parent = 0) : QStyledItemDelegate(parent) { }
    5.  
    6. void paint(QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index ) const
    7. {
    8. painter->save();
    9. painter->setPen(QColor(Qt::black));
    10. painter->drawRect(option.rect);
    11. painter->restore();
    12.  
    13. QStyledItemDelegate::paint(painter, option, index);
    14. }
    15. };
    16.  
    17. int main(int argc, char ** argv)
    18. {
    19. QApplication app(argc, argv);
    20.  
    21. model.setRowCount(5);
    22. model.setColumnCount(5);
    23.  
    24. for(int r = 0; r < model.rowCount(); r++)
    25. for(int c = 0; c < model.columnCount(); c++)
    26. model.setItem(r, c, new QStandardItem("Item"));
    27.  
    28. QTreeView treeView;
    29. treeView.setModel(&model);
    30. treeView.setItemDelegate(new GridDelegate(&treeView));
    31. treeView.show();
    32.  
    33. return app.exec();
    34. }
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    When you know how to do it then you may do it wrong.
    When you don't know how to do it then it is not that you may do it wrong but you may not do it right.

  3. The following user says thank you to Santosh Reddy for this useful post:

    smhall316 (12th July 2013)

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