QMainWindow Minimize

[Henry Blue Heeler]

I'm trying to find documentation regarding a signal or event when I click Minimize on a QMainWindow.
Basically, when I click Minimize, I want to know about it.
Any Advice?

Windows 7 64, Qt 5.

[yeye_olive]

QWidget::changeEvent() seemingly notifies changes in the window state (event type QEvent::WindowStateChange). See the docs for details.

[ChrisW67]

You should receive QWidget::hideEvent() and showEvent() calls on minimise/restore.

[Henry Blue Heeler]

Thanks Chris, I'll need to try hideEvent() and showEvent().
changeEvent() worked great for my purposes, e.g.

void MainWindow::changeEvent(QEvent *event) 
    {
    event->accept();
    if( event->type() == QEvent::WindowStateChange )
        {
        if( windowState() == Qt::WindowMinimized )
            {
            doSomething(this);
            }
        else if( windowState() == Qt::WindowNoState ) 
            {
            doSomethingElse(this);
            }
        }
    }

void MainWindow::changeEvent(QEvent *event) 
    {
    event->accept();
    if( event->type() == QEvent::WindowStateChange )
        {
        if( windowState() == Qt::WindowMinimized )
            {
            doSomething(this);
            }
        else if( windowState() == Qt::WindowNoState ) 
            {
            doSomethingElse(this);
            }
        }
    }

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[yeye_olive]

hideEvent() and showEvent() are less specific than QEvent::WindowStateChange; they are called when a widget is hidden/shown for any reason, not limited to a window being minimized/restored/maximized.

Your code probably overrides more behaviour than you wish. If I were you, I would try this instead:

void MainWindow::changeEvent(QEvent *event)
{
    QMainWindow::changeEvent(event);
    if( event->type() == QEvent::WindowStateChange )
    {
        if( windowState() == Qt::WindowMinimized )
        {
            doSomething(this);
        }
        else if( windowState() == Qt::WindowNoState )
        {
            doSomethingElse(this);
        }
    }
}

void MainWindow::changeEvent(QEvent *event)
{
    QMainWindow::changeEvent(event);
    if( event->type() == QEvent::WindowStateChange )
    {
        if( windowState() == Qt::WindowMinimized )
        {
            doSomething(this);
        }
        else if( windowState() == Qt::WindowNoState )
        {
            doSomethingElse(this);
        }
    }
}

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That code does interfere with QMainWindow's event handling; it only does something afterwards (which is what you seem to need here).