[英]QObject set QList as parent using setParent()
I'm trying to use QObject
tree delete mechanism to delete the list and all QObject
s that are stored in the list. 我正在尝试使用QObject
树删除机制来删除列表以及存储在列表中的所有QObject
。 Qt is still my very week area... Qt仍然是我每周的工作区域...
QList<QObject*>* list = new QList<QObject*>();
QObject* obj1 = new QObject();
QObject* obj2 = new QObject();
obj1->setParent(obj2);
obj2->setParent((QObject*)list);
I got "Segmentation fault" at last line. 我在最后一行收到“细分错误”。 Can't the QList
be used as a parent? QList
不能用作父项吗? Doesn't it inherit from QObject
? 它不是从QObject
继承吗?
Edit : 编辑 :
The main question - is it possible to conveniently delete the list and all list elements without extending the QList
class? 主要问题-是否可以在不扩展QList
类的情况下方便地删除列表和所有列表元素? This need to be called by client so it have to be simple. 这需要由客户端调用,因此必须简单。
I would like to simply call: 我想简单地打电话给:
delete list;
and not 并不是
qDeleteAll(list);
delete list;
No. QList
does not inherit from QObject
. 不可以QList
不能从QObject
继承。 If you want to delete the contents of the list easily, you can use qDeleteAll(list)
. 如果要轻松删除列表的内容,可以使用qDeleteAll(list)
。
Edit: This is untested, and there may be problems from the base class not having a virtual destructor - but give it ago. 编辑:这未经测试,并且可能有没有虚拟析构函数的基类的问题-但要提前给出。
template < class T >
class MyList : public QList< T >
{
static_assert( std::is_pointer< T >::value,
"T must be a pointer." );
// Constructors...
...
virtual ~MyList() { qDeleteAll( *this ); }
}
option 1) 选项1)
QList<QObject*> list;
.. somewhere in the code
QObject * obj = new QObject();
list << obj;
...
then
onDelete() { // variant 1
QObject * ptr;
foreach(ptr, list) {
delete ptr;
}
list(clear);
}
onDelete() { // variant 2
qDeleteAll(list);
}
option 2) 选项2)
QObject * parent = new QObject();
somewhere in a code
...
QObject * child1 = new QObject(parent);
QObject * child2 = new QObject(parent);
onDelete() {
delete parent; // all children deleted automatically
}
UPD: UPD:
From your question update, I can consider that you don't QList at all, just use QObject provided functionality, and if you need children use appropriate childer() method which will give you QList 从您的问题更新中,我可以认为您根本就没有QList,只需使用QObject提供的功能,如果需要子项,请使用适当的childer()方法,该方法将为您提供QList
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