Qt -在单击时展开QTreeView？

Question

虽然双击QTreeView的文本会展开子项，但单击不会。但是，CSS中定义的图标(放置在文本左侧)只需单击一次即可展开子项。如何使文本的单击(或触摸事件)可以展开子项？

    bookTreeView->setModel(standardModel);
    bookTreeView->setEditTriggers(QAbstractItemView::NoEditTriggers);
    bookTreeView->setWordWrap(true);
    bookTreeView->sizeHint();
    //bookTreeView->mousePressEvent(QMouseEvent());
    bookTreeView->setTextElideMode(Qt::ElideNone);
    bookTreeView->setExpandsOnDoubleClick(true);
    bookTreeView->setUniformRowHeights(true);
    bookTreeView->setHeaderHidden(true);
    bookTreeView->setStyleSheet("QTreeView { font-size: 27px; show-decoration-selected: 0; } QTreeView::branch:has-siblings:!adjoins-item { border-image: none; } QTreeView::branch:has-siblings:adjoins-item { border-image: none; } QTreeView::branch:!has-children:!has-siblings:adjoins-item { border-image: none;} QTreeView::branch:has-children:!has-siblings:closed, QTreeView::branch:closed:has-children:has-siblings { border-image: none; image: url(':images/images/right_arrow.png'); } QTreeView::branch:open:has-children:!has-siblings, QTreeView::branch:open:has-children:has-siblings  { border-image: none; image: url(':images/images/down_arrow.png'); } ");

Answer 1

一些类似的东西

QObject::connect(
    tree, SIGNAL(clicked(const QModelIndex &)), 
    tree, SLOT(expand(const QModelIndex &))
);

clicked信号可能不会执行您想要的操作。您还可以查看currentChanged信号，这可能是您想要的。我从未在移动环境中使用过Qt :)

Answer 2

同样的Grund答案，但如果它已经打开，我会在点击时添加close。

QObject::connect(
    tree, SIGNAL(clicked(const QModelIndex &)), 
    this, SLOT(expandItem(const QModelIndex &))
);

void MainWindow::expandItem(const QModelIndex &index)
{
    tree->isExpanded(index)? tree->collapse(index) : tree->expand(index);
}

在mainwindow.h中：

private slots:
void expandItem(const QModelIndex &index)

Answer 3

您是否已尝试关闭双击扩展功能？

bookTreeView->setExpandsOnDoubleClick(false);