> Sent: Friday, February 22, 2019 at 3:10 PM > From: "Matthew Woehlke" <mwoehlke.fl...@gmail.com> > To: "Jason H" <jh...@gmx.com>, "interest@qt-project.org" > <interest@qt-project.org> > Subject: Re: Taking back a widget from a QBoxLayout? > > On 22/02/2019 14.42, Jason H wrote: > >>> https://doc.qt.io/qt-5/layout.html#tips-for-using-layouts > > From that: > > ''' > > When you use a layout, you do not need to pass a parent when > > constructing the child widgets. The layout will automatically > > reparent the widgets (using QWidget::setParent()) so that they are > > children of the widget on which the layout is installed. > > > > Note: Widgets in a layout are children of the widget on which the > > layout is installed, not of the layout itself. Widgets can only have > > other widgets as parent, not layouts.> ''' > > > > However: > > ''' > > void QLayout::addItem(QLayoutItem *item) > > [...] > > Note: The ownership of item is transferred to the layout, and it's the > > layout's responsibility to delete it. > > > > void QLayout::addWidget(QWidget *w) > > Adds widget w to this layout in a manner specific to the layout. This > > function uses addItem(). > > ''' > > ...but that's talking about a *QLayoutItem*, which is *not* a QWidget > (or even a QObject). It's a class that encapsulates a "thing" (widget, > other layour, spacer, ...) that is present in a QLayout. > > Let's say you have widgets P and C, with P having layout L which > contains C. > > P "owns" C and (AFAIK) L. > > There *also* exists a layout item I. L owns I. I *references*, but does > not own, C.
I am with you, but confused by "This function uses addItem()." Since addItem is used to QLayout*, I don't see how this is possible? _______________________________________________ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
