一.效果

二.实现

网格线虽然可以用样式表添加，但效果不好。这里重写QTreeView的drawRow函数来实现网格线的绘制。

void QHTreeView::drawRow(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    QTreeView::drawRow(painter, option, index);

    QPen pen = painter->pen();
    pen.setWidth(1);
    pen.setColor(Qt::lightGray);
    painter->setPen(pen);
    int y = option.rect.y();
    painter->save();
    for (int i = 0; i < header()->count() - 1 ; i++)
    {
        painter->translate(header()->sectionSize(i) - 0.5, 0);
        painter->drawLine(0, y, 0, y + option.rect.height());