双击QTreeView的文本会扩展子项,而单击则不会。但是,CSS中定义的图标(放置在文本左侧)可以通过单击扩展子项。如何使文本单击(或触摸事件)才能扩展孩子?
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'); } ");
有点像
QObject::connect(
tree, SIGNAL(clicked(const QModelIndex &)),
tree, SLOT(expand(const QModelIndex &))
);
clicked
signal可能不会做你想要的。您还可以查看currentChanged
信号,这可能是您想要的。我从来没有在移动环境中使用过Qt :)
相同的Grund答案,但如果已经打开,我会在点击上添加关闭。
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)
您是否尝试关闭双击扩展?
bookTreeView->setExpandsOnDoubleClick(false);
ui.tree_view->setExpandsOnDoubleClick(false);
QObject::connect(ui.tree_view, &QTreeView::clicked, [this]() {
if (ui.tree_view->isExpanded(ui.tree_view->currentIndex())) {
ui.tree_view->collapse(ui.tree_view->currentIndex());
}else{
ui.tree_view->expand(ui.tree_view->currentIndex());
}
});
在Qt的Visual Studio版本上测试。 一种可在单击时打开和关闭的备用方法。 此方法不需要额外的功能,因为它使用lambda。 将其放在构造函数中以运行。 注意:我设置双击扩展为false,因为逻辑上当单击一次展开时,两次单击将撤消第一次执行的展开。 该选项使流程更流畅,更一致。