How to add QGridLayout to QScrollArea?

SGaist

Well, the code you show here does not contain the part related to the labels. The issue might be in what you did not post.

TomNow99

@SGaist This is my whole code:

 layoutWithLabels = new QGridLayout;
    scrollWidget = new QWidget;
    area= new QScrollArea;
    area->setWidget(scrollWidget);
    scrollWidget->setLayout(layoutWithLabels);
    setCentralWidget(area);


    for(int i=0;i<10;i++)
    {
        wektor.append(new QLabel("randomText"));
        wektor[i]->setStyleSheet("QLabel {background-color:red}");

        layoutWithLabels->addWidget(wektor[i],i,0, Qt::AlignRight);

        wektor[i]->setFixedSize(50,20);
    }

wektor is QVector<QLabel*>

SGaist

Just a silly idea: build the complete widget first so it has all its content in place and as last step create the scroll area and put the widget in.

TomNow99

@SGaist hmmm, it works, but there is a new problem.

Now my code looks like:

    layoutWithLabels = new QGridLayout;

    for(int i=0;i<30;i++)
    {
        wektor.append(new QLabel(QString::number(i)));
        wektor[i]->setStyleSheet("QLabel {background-color:red}");

        layoutWithLabels->addWidget(wektor[i],i,0);

        wektor[i]->setFixedSize(50,20);
    }
    scrollWidget = new QWidget;
    scrollWidget->setLayout(layoutWithLabels);
    area= new QScrollArea;
    area->setWidget(scrollWidget);

    setCentralWidget(area);

But if you read my first post I would like to add a new QLabel to QGridLayout after 5 sec. I have QTimer and slot:

void MainWindow::timeoutSlot()
{
    static int i=30;
    wektor.append(new QLabel(QString::number(i)));
    wektor[i]->setStyleSheet("QLabel {background-color:red}");

    layoutWithLabels->addWidget(wektor[i],i,0);

    wektor[i]->setFixedSize(50,20);
    i++;
}

and it add new QLabel, but look:
This is my app after start:

and this is my app after add new QLabels:

QLabels are overlap

SGaist

There's no need for that static i variable. You can use the vector size for your computation.

TomNow99

@SGaist Yeah, you are right with static :) But what with the main problem?

JonB

@TomNow99
I think QGridLayout's job is to fit everything. You have to give something a size/spacing to make it work. setRowMinimumHeight(int row, int minSize)? setSpacing(int spacing)?

TomNow99

@JonB I try setSpacing and setRow but not work :(

SGaist

Since you have your labels in on column, why not use a QVBoxLayout ?

mrjj

Hi
Tried your code and it worked?
(not including the static int )

alt text

  QTimer::singleShot(5000, [this, layoutWithLabels]() {
        wektor.append(new QLabel(QString::number( wektor.size()))  );
        wektor.last()->setStyleSheet("QLabel {background-color:blue}");

        layoutWithLabels->addWidget(wektor.last(), wektor.size(), 0);

        wektor.last()->setFixedSize(50, 20);
    });

TomNow99

Hello,
@SGaist You are right. I started from QVBoxLayout, but I had problem with Alingment QLabels in layout, so I use QGridLayout.

@mrjj Please repeat add QLabel many Times. Of course you can change 5 sec to 0.5 sec. When I use your code I get:

Bonnie

[EDITED]
Removed my previous answer.
I've found the solution:

layoutWithLabels->setSizeConstraint(QLayout::SetMinimumSize);

QLayout::SetMinAndMaxSize also works.

TomNow99

@Bonnie P E R F E C T! Thank you!

Thanks for all you:@mrjj @JonB @SGaist