few questions related to QTreeWidget

[jpn]

How does a grid fit to a tree??

[jpn]

How does a grid fit to a tree??

...unless there are only top level items and root decoration is set to false, which means you have a multi-column list

Could you please provide me some sample code ?

If you use the custom delegate approach proposed by wysota:
override QItemDelegate:aint()

void MyItemDelegate::paint(QPainter* p, const QStyleOptionViewItem &opt, const QModelIndex &idx) const
{
	QItemDelegate::paint(p, opt, idx);
	if (idx.isValid())
	{
		p->setPen(Qt::DotLine);
		p->drawRect(opt.rect);
	}
}

void MyItemDelegate::paint(QPainter* p, const QStyleOptionViewItem &opt, const QModelIndex &idx) const
{
	QItemDelegate::paint(p, opt, idx);
	if (idx.isValid())
	{
		p->setPen(Qt::DotLine);
		p->drawRect(opt.rect);
	}
}

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And the another approach, override QTreeView::drawRow()

void MyTreeWidget::drawRow(QPainter* p, const QStyleOptionViewItem &opt, const QModelIndex &idx) const
{
	QTreeWidget::drawRow(p, opt, idx);
	for (int col = 0; col < columnCount(); ++col)
	{
		QModelIndex s = idx.sibling(idx.row(), col);
		if (s.isValid())
		{
			QRect rect = visualRect(s);
			p->setPen(Qt::DotLine);
			p->drawRect(rect);
		}
 
	}
}

void MyTreeWidget::drawRow(QPainter* p, const QStyleOptionViewItem &opt, const QModelIndex &idx) const
{
	QTreeWidget::drawRow(p, opt, idx);
	for (int col = 0; col < columnCount(); ++col)
	{
		QModelIndex s = idx.sibling(idx.row(), col);
		if (s.isValid())
		{
			QRect rect = visualRect(s);
			p->setPen(Qt::DotLine);
			p->drawRect(rect);
		}

	}
}

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