QGridLayout Spacing issue

[markcurl]

Hello,

please have a look at the following code:

#include "MainWindow.h"
#include "ui_MainWindow.h"
#include <QGridLayout>
#include <QGroupBox>
#include <QLineEdit>

MainWindow::MainWindow(QWidget *parent) :
   QMainWindow(parent),
   ui(new Ui::MainWindow)
{
   ui->setupUi(this);

   QGridLayout* lay= new QGridLayout();
   lay->setSpacing(10);
   lay->setMargin(10);
   lay->setAlignment(Qt::AlignTop);
   lay->setOriginCorner(Qt::TopLeftCorner);

   QLineEdit* edit1 = new QLineEdit("edit1");
   edit1->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed );

   QLineEdit* edit2 = new QLineEdit("edit2");
   edit2->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::MinimumExpanding );
   edit2->setMaximumSize(400,300);

   QGroupBox* group = new QGroupBox("Group");
   group->setSizePolicy( QSizePolicy::Preferred, QSizePolicy::Fixed );

   QGridLayout* boxLay = new QGridLayout(group);
   boxLay->setSpacing(10);
   boxLay->setMargin(10);

   QLineEdit* edit3 = new QLineEdit("edit3");
   edit3->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed );

   boxLay->addWidget(edit3, 0,0);

   QLineEdit* edit4 = new QLineEdit("edit4");
   edit4->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed );

   lay->addWidget(edit1,0,0);
   lay->addWidget(edit2,1,0);
   lay->addWidget(group,3,0,2,1);
   lay->addWidget(edit4,5,0);

   this->centralWidget()->setLayout(lay);
}

If you expand the window, edit2 grows to its maximumSize.
After the maximumSize is reached, a space between the other widgets will inserted.

What can I do to prevent this behaviour and create the space at the end?

[raven-worx]

@markcurl
since you have set the size-policy of all widgets accordingly.
With a QVBoxLayout you could simply add a stretch to the layout after all widgets.

Alternatively you can try adding a QSpacerItem at the end of the QGridLayout:

QSpacerItem* vSpacerItem = new QSpacerItem( 0, 0, QSizePolicy::Minimum, QSizePolicy::Expanding );

lay->addWidget(edit1,0,0);
lay->addWidget(edit2,1,0);
lay->addWidget(group,3,0,2,1);
lay->addWidget(edit4,5,0);
lay->addItem(vSpacerItem, 5, 0);

I haven't tested it, but thats basically what QBoxLayout does when adding a stretch.

[markcurl]

@raven-worx

Thanks, works fine :)