Make QVBoxLayout act like QFormLayout

[petwoip]

I've been trying to make a QVBoxLayout act like a QFormLayout so that when I add widgets to the QVBoxLayout, they do not stretch across the length of the parent widget. I've been trying to do this with sizePolicies, sretchFactors, etc, but I can't seem to figure it out.

Here's my code:

QPushButton* thing1 = new QPushButton(QObject::tr("Hi"));
    QPushButton* thing2 = new QPushButton(QObject::tr("There"));
    QPushButton* thing3 = new QPushButton(QObject::tr("Again"));
 
    QVBoxLayout* layout = new QVBoxLayout();
    layout->addWidget(thing1);
    layout->addWidget(thing2);
    layout->addWidget(thing3);
 
    QWidget* widget = new QWidget();
    widget->resize(300,300);
    widget->setLayout(layout);
    widget->show();

QPushButton* thing1 = new QPushButton(QObject::tr("Hi"));
    QPushButton* thing2 = new QPushButton(QObject::tr("There"));
    QPushButton* thing3 = new QPushButton(QObject::tr("Again"));
    
    QVBoxLayout* layout = new QVBoxLayout();
    layout->addWidget(thing1);
    layout->addWidget(thing2);
    layout->addWidget(thing3);
    
    QWidget* widget = new QWidget();
    widget->resize(300,300);
    widget->setLayout(layout);
    widget->show();

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Output using a QFormLayout:



Output using a QVBoxLayout:



I'd like the QVBoxLayout version to mimic the QFormLayout version.

[wysota]

Why don't you just use QFormLayout then?

[petwoip]

I suppose I could in some cases, but what if I wanted to use a QHBoxLayout instead of a QVBoxLayout (to my [limited] knowledge there is no way to make a sideways QFormLayout). I'm trying to understand what property of layouts lets me modify the layout's behavior when i expand the window.

[norobro]

Maybe I'm missing something but won't QVBoxLayout::addStretch() do what you want?

[petwoip]

Oh cool, addStretch(0) achieves the desired behavior!

[wysota]

I suppose I could in some cases, but what if I wanted to use a QHBoxLayout instead of a QVBoxLayout (to my [limited] knowledge there is no way to make a sideways QFormLayout). I'm trying to understand what property of layouts lets me modify the layout's behavior when i expand the window.

The layout behaviour is decided upon settings of the widgets (their size hint and size policies). Your problem is not a problem with QHBoxLayout as it will do what you want out of the box.

[ChiliPalmer]

setAlignment(Qt::AlignTop); should also do the trick

[petwoip]

Thanks for the help guys! This is a lot clearer to me now.