[Interest] Taking back a widget from a QBoxLayout?
mwoehlke.floss at gmail.com
Fri Feb 22 21:10:04 CET 2019
On 22/02/2019 14.42, Jason H wrote:
> 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.> '''
> 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
P "owns" C and (AFAIK) L.
There *also* exists a layout item I. L owns I. I *references*, but does
not own, C.
More information about the Interest