Long press button with progress dialog

wasawi2

Dear all,

I implemented a long press button. So if the user holds pressed for less than 2 sec. nothing happens. Holding for more than 2sec. will trigger an action on timer timeout. So far so good.

Now I want to have progress dialog showing the growing bar before the 2sec. happen.

The problem is that when i implement the dialog, for some reason, my long press button looses focus and Qt automatically throws a release event on it. Which breaks the functionality i intend to implement.

Is there any way to prevent Qt from throwing that release event?

Or how would you implement this simple functionality?

Here is my current code:

    m_longClickTimer.setSingleShot(true);
    connect(ui.button_auto, &QPushButton::pressed, this, &MainWindow::StartLongPress);
    connect(ui.button_auto, &QPushButton::released, this, &MainWindow::CheckLongPress);
    connect(&m_longClickTimer, &QTimer::timeout, this, &MainWindow::LongPressTimeOut);


void MainWindow::StartLongPress()
{
    m_longClickTimer.start(2000);
    m_progressdialog_auto = new QProgressDialog(ui.button_auto);
    m_progressdialog_auto->setModal(false);
    m_progressdialog_auto->show();
}

// BUG HERE
// this method is triggered automatically if i open a diglog
void MainWindow::CheckLongPress()
{
    if (m_longClickTimer.isActive()) {
        qDebug() << "CheckLongPress: Released too early";
        m_longClickTimer.stop();
        m_progressdialog_auto->deleteLater();
    }
}

void MainWindow::LongPressTimeOut()
{
    qDebug() << "LongPress: My next action here";
}

Pl45m4

@wasawi2 said in Long press button with progress dialog:

Any other ideas will be appreciated.

Try Qt::WindowDoesNotAcceptFocus window flag on your progressBar widget.
Or Qt::Tooltip. AFAIK tooltips dont steal focus. Might be a bit hacky. Would prefer the first one if it works.

Edit:
There is also this

setAttribute(Qt::WA_ShowWithoutActivating)

https://doc.qt.io/qt-6/qt.html#WidgetAttribute-enum

which might be the best solution if it does what you expect

JonB

@wasawi2
To be clear: you start a key press on a focussed button. That open a modeless dialog and shows it. Doubtless that causes some kind of focus change and that causes button-press-termination in the original window, with a release event. Right? I don't know but either this has to happen or maybe you can do something about the new dialog now getting/accepting focus so that does not occur?

P.S.
Try your code with a plain QDialog instead of a QProgressDialog, and also with a plain QWidget. Any difference? Then we know whether it is anything to do with being a QProgressDialog.

wasawi2

@JonB Thank you very much.

Yes, what you explain is exactly what happens. I have tried with QDialog, QMainWindow and QProgressDialog, all behave in the same way, the release event is triggered when a new window opens...

So it seems I will have to find a workaround. I'm quite surprised because this kind of functionality is not too rare.

Any other ideas will be appreciated.

Pl45m4

@wasawi2 said in Long press button with progress dialog:

Any other ideas will be appreciated.

Try Qt::WindowDoesNotAcceptFocus window flag on your progressBar widget.
Or Qt::Tooltip. AFAIK tooltips dont steal focus. Might be a bit hacky. Would prefer the first one if it works.

Edit:
There is also this

setAttribute(Qt::WA_ShowWithoutActivating)

https://doc.qt.io/qt-6/qt.html#WidgetAttribute-enum

which might be the best solution if it does what you expect

Christian Ehrlicher

I would use something not that intrusive. Maybe color the button over time to show the progress.

wasawi2

@Pl45m4 said in Long press button with progress dialog:

setAttribute(Qt::WA_ShowWithoutActivating)

@Pl45m4 Thank you so much! that made the trick!

@Christian-Ehrlicher Thank you for your suggestion. Unfortunately in my case i use a touch screen and the buttons have to be the size of a finger, so i can't display anything in the button itself.

Christian Ehrlicher

@wasawi2 said in Long press button with progress dialog:

buttons have to be the size of a finger, so i can't display anything in the button itself.

How does this prevent coloring the button?

wasawi2

@Christian-Ehrlicher the user will not see well the button because they will have the finger on top of it blocking visibility.