Qt实现九宫图类控件

<1>. 头文件(类声明)

class CPreviewWidge : public QWidget
{
    Q_OBJECT
public:
    CPreviewWidge( const QString &strPath, QWidget *parent = 0);
    ~CPreviewWidge();

    QSize sizeHint()const;

protected:
    void paintEvent(QPaintEvent *e);    //九宫图重绘函数

private:
    QImage    m_imgLTop;    　　　　　　 //九宫图图片左上
    QImage    m_imgLCur;   　　　　　　  //九宫图图片左中
    QImage    m_imgLBut;    　　　　　　 //九宫图图片左下

    QImage    m_imgCTop;    　　　　　　 //九宫图图片中上
    QImage    m_imgCCur;    　　　　　　 //九宫图图片中中
    QImage    m_imgCBut;   　　　　　　  //九宫图图片中下

    QImage    m_imgRTop;   　　　　　　  //九宫图图片右上
    QImage    m_imgRCur;    　　　　　　 //九宫图图片右中
    QImage    m_imgRBut;    　　　　　　 //九宫图图片右下
};

<2>. cpp文件(类定义)

CPreviewWidge::CPreviewWidge( const QString &strPath, QWidget *parent )    //传参：九宫图中上图片路径和控件父类对象
: QWidget( parent )
{
    int iLeft = strPath.lastIndexOf( "_" );
    QString strLeftPath = strPath.left( iLeft );

    m_imgLTop = QImage( strLeftPath + "_ltop.png" );
    m_imgLCur = QImage( strLeftPath + "_lcur.png" );
    m_imgLBut = QImage( strLeftPath + "_lbot.png" );

    m_imgCTop = QImage( strLeftPath + "_ctop.png" );
    m_imgCCur = QImage( strLeftPath + "_ccur.png" );
    m_imgCBut = QImage( strLeftPath + "_cbot.png" );

    m_imgRTop = QImage( strLeftPath + "_rtop.png" );
    m_imgRCur = QImage( strLeftPath + "_rcur.png" );
    m_imgRBut = QImage( strLeftPath + "_rbot.png" );
}

CPreviewWidge::~CPreviewWidge()
{
}

QSize CPreviewWidge::sizeHint() const
{
    int iHeight = m_imgLTop.height() + m_imgLCur.height() + m_imgLBut.height();
    int iWidth = m_imgLTop.width() + m_imgCTop.width() + m_imgRTop.width();

    return QSize( iWidth, iHeight );
}

void CPreviewWidge::paintEvent ( QPaintEvent* e )
{
    QWidget::paintEvent( e );

    QPainter painter( this );
    QRect r = rect();

    painter.drawImage( r.topLeft().x(), r.topLeft().y(), m_imgLTop );
    painter.drawImage( r.topRight().x() - m_imgRTop.width(), r.topRight().y(), m_imgRTop );
    painter.drawImage( r.bottomLeft().x(), r.bottomLeft().y() - m_imgLBut.height(), m_imgLBut );
    painter.drawImage( r.bottomRight().x() - m_imgRBut.width(), r.bottomRight().y() - m_imgRBut.height(), m_imgRBut );

    QRect rectLCut( r.topLeft().x(), r.topLeft().y() + m_imgLTop.height(),
                m_imgLCur.width(), ( r.bottomLeft().y() - r.topLeft().y() ) - m_imgLTop.height() - m_imgLBut.height() );
                painter.drawImage( rectLCut, m_imgLCur );

    QRect rectRCut( r.topRight().x() - m_imgRTop.width(), r.topRight().y() + m_imgRTop.height(),
                m_imgRCur.width(), ( r.bottomLeft().y() - r.topLeft().y() ) - m_imgLTop.height() - m_imgLBut.height() );
                painter.drawImage( rectRCut, m_imgRCur );

    QRect rectCTop( r.topLeft().x() + m_imgLTop.width(), r.topLeft().y(),
                ( r.topRight().x() - r.topLeft().x() ) - m_imgLTop.width() - m_imgRTop.width(), m_imgCTop.height() );
                painter.drawImage( rectCTop, m_imgCTop );

    QRect rectCBot( r.bottomLeft().x() + m_imgLBut.width(), r.bottomLeft().y() - m_imgLBut.height(),
                ( r.topRight().x() - r.topLeft().x() ) - m_imgLTop.width() - m_imgRTop.width(), m_imgCBut.height() );
                painter.drawImage( rectCBot, m_imgCBut );

    QRect rectCCur( r.topLeft().x() + m_imgLTop.width(), r.topLeft().y() + m_imgLTop.height(),
                ( r.topRight().x() - r.topLeft().x() ) - m_imgLTop.width() - m_imgRTop.width(),
                ( r.bottomLeft().y() - r.topLeft().y() ) - m_imgLTop.height() - m_imgLBut.height() );
                painter.drawImage( rectCCur, m_imgCCur );
}