Change styling of flat QPushButton hover state (without using style sheets)

Question

Flat QPushButtons have no indication of mouse hovering. Is there a way to set the styling for the flat button hover state so that it matches the style of the normal button hover state (or something similar)?

I don't want to use style sheets if it means deviating away from the default look or having to design the button styles from scratch.

Answer 1

One way of doing it is deriving QPushButton:

pushbutton.h:

#ifndef PUSHBUTTON_H
#define PUSHBUTTON_H

#include <QPushButton>

class PushButton : public QPushButton
{
    Q_OBJECT
public:
    explicit PushButton(QWidget *parent = 0);

protected:
    bool event(QEvent * event);

};

#endif // PUSHBUTTON_H

pushbutton.cpp:

#include "pushbutton.h"

#include <QEvent>

PushButton::PushButton(QWidget *parent) :
    QPushButton(parent)
{
    setFlat(true);
}

bool PushButton::event(QEvent *event)
{
    if(event->type() == QEvent::HoverEnter)
    {
        setFlat(false);
    }

    if(event->type() == QEvent::HoverLeave)
    {
        setFlat(true);
    }

    return QPushButton::event(event);
}