Blinking Buttons

[mcosta]

You can use a QTimer with interval of 1s and connect the "timeout()" signal with a slot that change background color

[metdos]

I used QTimer.

for initialization

QTimer *timer = new QTimer(this);
     connect(timer, SIGNAL(timeout()), this, SLOT(update()));
     timer->start(1000);

QTimer *timer = new QTimer(this);
     connect(timer, SIGNAL(timeout()), this, SLOT(update()));
     timer->start(1000);

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and for stooping timer

timer->stop();

timer->stop();

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[mcosta]

You must create a slot (ie. "changeColorSlot()") and connect it to timeout signal

void MyButton::changeColorSlot()
{
    QColor currentColor = this->palette()->color(QPalette::Button);
    QColor newColor;
    if (currentColor == this->color1)
        newColor = this->color2;
    else
        newColor = this->color1;
 
    this->palette()->setColor(QPalette::Button, newColor);
}

void MyButton::changeColorSlot()
{
    QColor currentColor = this->palette()->color(QPalette::Button);
    QColor newColor;
    if (currentColor == this->color1)
        newColor = this->color2;
    else
        newColor = this->color1;

    this->palette()->setColor(QPalette::Button, newColor);
}

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[Lykurg]

Hi, just a single optimization suggestion: I would use a int to determinate the state instead of querying the color:

private:
  QColor m_color1;
  QColor m_color2;
  int m_buttonState;
//...
void MyButton::changeColorSlot()
{
  m_buttonState = ++m_buttonState % 2
  this->palette()->setColor(QPalette::Button, (m_buttonState) ? m_color1 : m_color2);
  update();
}

private:
  QColor m_color1;
  QColor m_color2;
  int m_buttonState;
//...
void MyButton::changeColorSlot()
{
  m_buttonState = ++m_buttonState % 2
  this->palette()->setColor(QPalette::Button, (m_buttonState) ? m_color1 : m_color2);
  update();
}

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[wysota]

I would use a bool

[Lykurg]

I would use a bool

Even better *shame*