I am using the constructor QWidget(QWidget *parent)
. This parent widget contains a lot of child widgets. I need to clear all the child widgets from the parent at runtime. How can I do this?
Previous answer is wrong!! You cannot use findChildren
to delete a widget's children, because Qt4's findChildren
recursively lists children. Therefore, you will delete children of children, which then may be deleted twice, potentially crashing your app.
More generally, in Qt, taking a list of QObject
pointers and deleting them one by one is dangerous, as destroying an object may chain-destroy other objects, due to the parent ownership mechanism, or by connecting a destroyed()
signal to a deleteLater()
slot. Therefore, destroying the first objects in the list may invalidate the next ones.
You need to list children widgets either by: