how to show vertical lines between colums

[thomasjoy]

hi all
i am using Qt4.1 on Mac OS

the idea is to showing the vertical lines between colums of QTreeWidget
as i have 4 colums in treewidget.
how it can be done???

and how data coming in all colums should be aligned squarely or in proper manner???


thanks in advance

[jpn]

I don't think there's any built-in way for doing that. What you can do is to reimplement paintEvent() and paint them yourself. The header provides information about column (section) positions and sizes.

[thomasjoy]

can you please explai how it can be done in simple example with no. of items are there in TreeWidget

[jpn]

Alright, here's an example:


#include <QtGui>

class TreeWidget : public QTreeWidget
{
public:
TreeWidget(QWidget* parent = 0) : QTreeWidget(parent)
{
setColumnCount(5);
}

protected:
void paintEvent(QPaintEvent* event)
{
QTreeWidget::paintEvent(event);
QPainter painter(viewport());
for (int i = 0; i < header()->count(); ++i)
{
// draw only visible sections starting from second column
if (header()->isSectionHidden(i) || header()->visualIndex(i) <= 0)
continue;

// position mapped to viewport
int pos = header()->sectionViewportPosition(i) - 1;
if (pos > 0)
painter.drawLine(QPoint(pos, 0), QPoint(pos, height()));
}
}

void scrollContentsBy(int dx, int dy)
{
QTreeWidget::scrollContentsBy(dx, dy);
// make sure lines get updated even if the view is empty
viewport()->update();
}
};

int main(int argc, char *argv[])
{
QApplication app(argc, argv);
TreeWidget tree;
tree.show();
return app.exec();
}

You could use for example QStyle::SH_Table_GridLineColor as pen color.

[thomasjoy]

thanks for such a nice example

but i dont have to use qpen or Qpaint properties...

can we disable the streching of treewidget's header
i.e header should be of fixed width