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DrawWidget::DrawWidget(QWidget *parent) : QWidget(parent)
{
    painter = new QPainter;
    //
    this->rect = new QRect(0, 0, 50, 50);
    this->color = new QColor(255, 0, 0, 255);
    this->resize(600, 400);
}
void DrawWidget::addBlur()
{
    QGraphicsBlurEffect* effect = new QGraphicsBlurEffect();
    effect->setBlurRadius(10);
    this->setGraphicsEffect(effect);
}

void DrawWidget::setBounds(QRect* rect) {this->rect = rect;}
void DrawWidget::setColor(QColor* color) {this->color = color;}

void DrawWidget::paintEvent ( QPaintEvent * event )
{
    QWidget::paintEvent(event);
    //
    if (painter->begin(this)) {
        painter->setPen(QPen(Qt::NoPen));
        painter->setBrush(QBrush(*color));
        painter->drawRect(*rect);
        painter->end();
    } else {
        qDebug() << "not begin";
    }
}

DrawWidget* draw1 = new DrawWidget(&mainWidget);
draw1->setBounds(new QRect(50, 50, 100, 100));
draw1->addBlur();
//
DrawWidget* draw2 = new DrawWidget(&mainWidget);
draw2->setBounds(new QRect(50, 50, 100, 100));
draw2->setColor(new QColor(255, 255, 0, 255));