Unable to move ScrollBar to the top

[SGaist]

Hi,

How are you moving this button ?
Do you have a widget set on the QScrollArea ?

[superg]

@SGaist Hi! I have a QWidget called QScrollAreaWidgetContents inside the QScrollArea.

I insert the network buttons shown before in this QWidget's layout.

[SGaist]

Wouldn't a QListWidget be simpler to use in your case ?

[superg]

@SGaist Never used one, haven't been using Qt for that much. I'm going to do some reading, check it out and let you know. Thanks!

[superg]

@SGaist Well, I've tried it but it doesn't work (I think).
The problem is that, when one of those buttons is clicked, It'll show a QLineEdit for password and a QPushButton to connect, like this:
Button in normal state:

Button clicked:

The problem is that these are not simple QPushButtons, but widgets of my own custom class that extends QFrame. So, when I put these same buttons in a QListWidget, this is what I get:

At first, every button is just a blue rectangle like seen in the first rows, but when clicked they extend onto the buttons below. So, the only button that works correctly is the last one. Is there a way to give more space to each button? And allow them to change size without breaking everything?

[SGaist]

Ok, I thought you were showing just a list of item but since it's a custom widget, the QScrollArea should be fine. Did you try to use QScrollArea::ensureWidgetVisible ?

[superg]

@SGaist It doesn't seem to work. The fact that the scroll area is inside a QFrame with a layout shouldn't matter, am I right?

[SGaist]

AFAIK, it should not.

Can you reproduce that issue if you build a minimal application with a QScrollArea that you fill with plain QPushButton ?

[superg]

@SGaist Nope, I did what you ask and it works perfectly. It doesn't make sense, the code is the almost the same. This is what I wrote:

QVBoxLayout* lay = qobject_cast<QVBoxLayout*>(ui->scrollAreaWidgetContents->layout());
    for (int i = 0; i<20; i++) {
        QPushButton * button = new QPushButton(QString::number(i),this);
        button->setStyleSheet("QPushButton {color:white; background:blue}");
        connect(button, &QPushButton::clicked, this, [this]() {
            QVBoxLayout* lay = qobject_cast<QVBoxLayout*>(ui->scrollAreaWidgetContents->layout());
            QPushButton* button = qobject_cast<QPushButton*>(sender());
            lay->removeWidget(button);
            lay->insertWidget(0,button);
            ui->scrollArea->verticalScrollBar()->setValue(0);
        });

        lay->addWidget(button);
    }

[superg]

@SGaist I changed the desing: Now QPushButtons are displayed in the QScrollArea, so the Button with the ssid and the other elements (The line to write a password, the button to connect to a network) are shown separately. With these simple changes, the code I wrote before works like a charm! True, It wasn't what I originally intended, but I realized that it's far better due to the circumstances where this app is going to be used.
Thanks for your time and your help!