QT -- how to set shadow effect in QWidget

Introduce

 This is a tool to set up QWidget Control and its child control shadow effect class .

Parent class

 Inherited from :QGraphicsEffect

attribute

blurRadius:qeal
 Blur radius : have access to  qreal blurRadius() const  and void setBlurRadius(qreal blurRadius) Get and set the value of the current property , The default value is 1.

color:QColor
 Set the shadow color : have access to QColor color() const and void setColor(const QColor &color) To set and get the value of the current property , The default value is (QColor(63, 63, 63, 180))

offset : QPointF
 This attribute holds the shadow offset in pixels . By default , Lower right offset is 8 Pixels . The offset is given in the equipment coordinates , This means that it is not affected by proportion . have access to QPointF offset()const and void setOffset(const QPointF &ofs) To set and get the value of the current property .


xOffset : qreal
 This attribute holds the shadow offset in pixels X.

yOffset : qreal
 This attribute holds the shadow offset in pixels Y.

public inheritance

virtual QRectF boundingRectFor(const QRectF &rect) const override

Protection succession

virtual void draw(QPainter *painter) override

The signal

void blurRadiusChanged(qreal blurRadius)
void colorChanged(const QColor &color)
void offsetChanged(const QPointF &offset)

    QGraphicsDropShadowEffect*mpGraphicsDropShadowEffect= new QGraphicsDropShadowEffect(this);
    mpGraphicsDropShadowEffect->setColor(QColor(100,100,100,100));
    mpGraphicsDropShadowEffect->setBlurRadius(2);
    mpGraphicsDropShadowEffect->setOffset(2.5);
    ui->label->setGraphicsEffect(mpGraphicsDropShadowEffect);

Code demo