带复选框的QComboBox

问题描述

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

I'm creating QComboBox with checkboxes. How I can prevent collapsing of view on mouse clicking? I want to be able to set up checkboxes, but each time I click on item - drop-down of QComboBox is collapsed.

注意:目前，我正在调试Qt源并正在寻找解决方法...

Note: currently I'm debugging Qt sources and looking for workaround...

推荐答案

首先，您需要在组合框视图中安装事件过滤器，即:

First of all you need to install an event filter to the combo box view, i.e.:

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，以防止在单击时关闭它:

than you need to filter all mouse release events that happen on the combo box view to prevent its closing when you click on it:

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);
     }
}

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