带有复选框的QComboBox

Question

我正在创建带有复选框的QComboBox.如何防止鼠标点击时视图崩溃？我希望能够设置复选框,但每次单击项目时 - QComboBox的下拉列表都会折叠.

注意:目前我正在调试Qt源并寻找解决方法......

Answer 1

首先,您需要在组合框视图中安装事件过滤器,即:

combobox->view()->viewport()->installEventFilter(someobj);

您需要过滤组合框视图上发生的所有鼠标释放事件,以防止单击它时关闭它:

bool SomeObject::eventFilter(QObject *obj, QEvent *event)
{
     if (event->type() == QEvent::MouseButtonRelease) {
         int index = view()->currentIndex().row();

         if (itemData(index, Qt::CheckStateRole) == Qt::Checked) {
            setItemData(index, Qt::Unchecked, Qt::CheckStateRole);
         } else {
            setItemData(index, Qt::Checked, Qt::CheckStateRole);
         }

         [..]

         return true;
     } else {
         // Propagate to the parent class.
         return QObject::eventFilter(obj, event);
     }
}