[Development] parented_ptr

[Volker Hilsheimer]

> On 29 Oct 2025, at 16:27, André Somers <andre at familiesomers.nl> wrote:
> 
> Hi Daniel,
> On 29-10-2025 12:00, Daniel Schürmann wrote:
>> 
>> 
>> 
>> > On 29 Oct 2025, at 01:42, Ville Voutilainen <ville.voutilainen at gmail.com> wrote:
>> > 
>> 
>> One thing to consider in this context is if/how we’d like QLayout to be part of this logic. When building a widget UI, QLayout is ultimately responsible for taking core of the correct parent/child relationships etc. Opinions vary on that topic, but I typically create child widgets without parent and rely on the layout. So, we might find out that a QLayout::makeChildWidget makes sense.
> Maybe...? I mean, does it need it's own, given that it is a QObject already?

Fun thing is, the widgets QLayout::makeChildWidget creates would not be children of the QLayout object :)

I.e. today I often write

QDialog *dialog = new QDialog;
QLabel *label = new QLabel(tr(“User name:”));
QLineEdit *input = new QLineEdit;

QHBoxLayout *hbox = new QHBoxLayout;
hbox->addWidget(label);
hbox->addWidget(input);
dialog->setLayout(hbox); // now label and input are children of dialog


Instead I’d write

QDialog *dialog = new QDialog;
QHBoxLayout *hbox = new QHBoxLayout;
hbox->makeChildWidget<QLabel>(tr(“User name:”));
hbox->makeChildWidget<QLineEdit>();
dialog->setLayout(hbox);


But that’s something for the future, and needs more thinking wrt different layout classes (such as grid) - so let’s focus on the basics.

Volker