QT实现透明效果的按钮

typedef struct OpacityBtnInfoSet_Tag

{

    QRect rect;

    QColor color;

    QString strTime;

    QString strHall;

    OpacityBtnInfoSet_Tag()

    {

        strTime = "";

        strHall = "";

    }

    OpacityBtnInfoSet_Tag(OpacityBtnInfoSet_Tag& Info)

    {

        rect.setX(Info.rect.x());

        rect.setY(Info.rect.y());

        rect.setWidth(Info.rect.width());

        rect.setHeight(Info.rect.height());

        color = Info.color;

        strTime = Info.strTime;

        strHall = Info.strHall;

    }

} OpacityBtnInfoSet;

class COpacityButton : public QPushButton

//class ImgButton : public QLabel

{

    Q_OBJECT

public:

    COpacityButton(OpacityBtnInfoSet& Info, QWidget *parent = NULL);

    ~COpacityButton();

    void SetButtonInfo(OpacityBtnInfoSet& Info);

    void GetButtonInfo(OpacityBtnInfoSet& Info);

private slots:

private:

    OpacityBtnInfoSet m_BtnInfoSet;

protected:

   virtual void paintEvent(QPaintEvent *event);

   void mousePressEvent(QMouseEvent *event);

   void mouseReleaseEvent(QMouseEvent *event);

};

COpacityButton::COpacityButton(OpacityBtnInfoSet& Info, QWidget *parent)

    : QPushButton(parent),m_BtnInfoSet(Info)

{

    if(Info.rect.width() > 0 && Info.rect.height() > 0)

    {

        this->setGeometry(m_BtnInfoSet.rect);

        setMaximumSize(m_BtnInfoSet.rect.width(), m_BtnInfoSet.rect.height());

        resize(m_BtnInfoSet.rect.width(), m_BtnInfoSet.rect.height());

    }

}

COpacityButton::~COpacityButton()

{

}

void COpacityButton::SetButtonInfo(OpacityBtnInfoSet& Info)

{

    m_BtnInfoSet.strTime = Info.strTime;

    m_BtnInfoSet.strHall = Info.strHall;

    m_BtnInfoSet.rect.setRect(Info.rect.x(), Info.rect.y(), Info.rect.width(), Info.rect.height());

    if(m_BtnInfoSet.rect.width() > 0 && m_BtnInfoSet.rect.height() > 0)

    {

        this->setGeometry(m_BtnInfoSet.rect);

        setMaximumSize(m_BtnInfoSet.rect.width(), m_BtnInfoSet.rect.height());

        resize(m_BtnInfoSet.rect.width(), m_BtnInfoSet.rect.height());

    }

    m_BtnInfoSet.color = QColor(Info.color);

    update();

}

void COpacityButton::GetButtonInfo(OpacityBtnInfoSet& Info)

{

    Info.strTime = m_BtnInfoSet.strTime;

    Info.strHall = m_BtnInfoSet.strHall;

    Info.rect.setRect(m_BtnInfoSet.rect.x(), m_BtnInfoSet.rect.y(), m_BtnInfoSet.rect.width(), m_BtnInfoSet.rect.height());

    Info.color = QColor(m_BtnInfoSet.color);

}

void COpacityButton::mousePressEvent(QMouseEvent * event)

{

    QPushButton::mousePressEvent(event);

    setMaximumSize(m_BtnInfoSet.rect.width() + 8, m_BtnInfoSet.rect.height() + 8);

    resize(m_BtnInfoSet.rect.width() + 8, m_BtnInfoSet.rect.height() + 8);

    update();

}

void COpacityButton::mouseReleaseEvent(QMouseEvent *event)

{

    QPushButton::mouseReleaseEvent(event);

    setMaximumSize(m_BtnInfoSet.rect.width(), m_BtnInfoSet.rect.height());

    resize(m_BtnInfoSet.rect.width(), m_BtnInfoSet.rect.height());

    update();

}

void COpacityButton::paintEvent(QPaintEvent *event)

{

    QPushButton::paintEvent(event);

    QPainter paint(this);

    int red = m_BtnInfoSet.color.red();

    int green = m_BtnInfoSet.color.green();

    int blue = m_BtnInfoSet.color.blue();

    int x = this->rect().x();

    int y = this->rect().y();

    qreal width = this->rect().width();

    qreal height = this->rect().height();

    QLinearGradient lineGr(x, y, x, y+height);

    lineGr.setColorAt(0.0, QColor(255, 255, 255, 255));

    lineGr.setColorAt(0.02, QColor(red, green, blue, 191));

    lineGr.setColorAt(0.47, QColor(red, green, blue, 191));

    lineGr.setColorAt(0.48, QColor(50, 50, 50, 200));

    lineGr.setColorAt(0.5, QColor(50, 50, 50, 180));

    lineGr.setColorAt(0.8, QColor(red, green, blue, 191));

    lineGr.setColorAt(0.9, QColor(red, green, blue, 191));

    lineGr.setColorAt(1, QColor(255, 255, 255, 255));

    paint.setRenderHint(QPainter::Antialiasing);

    paint.setPen(Qt::NoPen);

    paint.setBrush(lineGr);

    paint.drawRoundedRect(x,y,width, height, 4, 4);

    paint.setPen(QColor(190,190,190,191));

    paint.drawEllipse(x+width - 20, y + 8, 40, height - 16);

    QFont font(tr("宋体"), 20);

    font.setBold(true);

    paint.setFont(font);

    paint.setPen(Qt::white);

    paint.drawText(rect(),Qt::AlignCenter, m_BtnInfoSet.strTime);

    font.setPointSize(15);

    paint.setFont(font);

    paint.drawText(x+width - 20, y + 8, 20, height - 16,

                   Qt::AlignRight | Qt::AlignVCenter, m_BtnInfoSet.strHall);

}