QPushButton resize event

[gcubar]

How I can know when a button has been resized?

Thanks.

[helloworld]

You could use an event filter, if you have a MainWindow class for example:

class QPushButton;
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    MainWindow(QWidget *parent = 0);
    ~MainWindow();
 
    bool eventFilter(QObject *object, QEvent *event);
 
private:
    QPushButton* _button;
};

class QPushButton;

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = 0);
    ~MainWindow();

    bool eventFilter(QObject *object, QEvent *event);

private:
    QPushButton* _button;
};

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In the constructor, I put:

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent),
      _button(new QPushButton)
{
    setCentralWidget(_button);
    _button->installEventFilter(this);
}

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent),
      _button(new QPushButton)
{
    setCentralWidget(_button);
    _button->installEventFilter(this);
}

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This way, MainWindow will receive all events sent to the button. The definition for eventFilter() could look like:

bool MainWindow::eventFilter(QObject *object, QEvent *event)
{
    if (_button == object && event->type() == QEvent::Resize) {
        qDebug() << "button was resized!";
    }
 
    return QMainWindow::eventFilter(object, event);
}

bool MainWindow::eventFilter(QObject *object, QEvent *event)
{
    if (_button == object && event->type() == QEvent::Resize) {
        qDebug() << "button was resized!";
    }

    return QMainWindow::eventFilter(object, event);
}

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You could also extend QPushButton and emit a signal when a resize event occurs. It all depends on your particular use-case.

[gcubar]

Thanks, this is what I needed.