QtreeView横向滚动条无法自适应

1.问题描述

QTreeView层级过多时，横向滚动条有时无法自适应，导致有些item右侧显示不全，无法点击按钮，所以需要实现一个适应函数，在Qtreeview展开，收起节点，或者单击节点时，调用这个函数，让滚动条能够自适应；

void TreeTaskList::SlotResizeTreeWidget()
{
    m_treeHoribarPos = ui.treeView->horizontalScrollBar()->value();
    m_isItemClicked = true;
    ui.treeView->resizeColumnToContents(0);//自适应
    ui.treeView->horizontalScrollBar()->setSliderPosition(m_treeHoribarPos);
}
connect(ui.treeView, &QTreeView::pressed, this, [=](QModelIndex index)
    {
        QStandardItem* pitem = m_modelTree->itemFromIndex(index);
        if (m_pSelectItem == pitem)
        {
            ui.treeView->clearSelection();
        }
        else
        {
            m_pSelectItem = pitem;
        }
        SlotResizeTreeWidget();
    });
    connect(ui.treeView, &QTreeView::expanded, this, [=](QModelIndex index)
    {
        SlotResizeTreeWidget();
    });
    connect(ui.treeView, &QTreeView::collapsed, this, [=](QModelIndex index)
    {
        SlotResizeTreeWidget();
    });