Qt实现转动轮播图分享！

Qt轮播图的实现代码，供大家参考，具体内容如下

qt轮播图简单的实现，功能会在后面完善

效果图：

这里我是用了QGraphicsScene+QGraphicsView+QGraphicsObject，其中对QGraphicsView和QGraphicsObject进行继承派生类功能进行了添加。时间有限，直接贴上关键代码部分供大家参考。

  //pictrueitem.h  #ifndef PICTRUEITEM_H  #define PICTRUEITEM_H  #include <QGraphicsPixmapItem>  #include <QGraphicsItem>  #include <QGraphicsObject>  #include <QPixmap>  class PictrueItem : public QGraphicsObject  {    Q_OBJECT    public:    explicit PictrueItem(QGraphicsItem *parent = Q_NULLPTR);    explicit PictrueItem(const QPixmap &pixmap, QGraphicsItem *parent = Q_NULLPTR);    virtual ~PictrueItem();    void setPixmap(const QPixmap &pixmap);    QPixmap pixmap() const;    virtual QRectF boundingRect() const;    void setTransformationMode(Qt::TransformationMode mode);    QPointF offset() const;    void setOffset(const QPointF &offset);    virtual int type()const;    void setType(int type);    int itemId()const;    void setItemId(int id);    protected:    void mousePressEvent(QGraphicsSceneMouseEvent *event);      void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);      virtual void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);    Q_SIGNALS:      void clicked();    void clickedId(int);    private:      QPointF pressedScenePoint;    QPointF m_offset;    QPointF m_pos;    Qt::TransformationMode mode;    QPixmap m_pixmap;    bool isPressed;    int m_type;    int m_id;    qreal m_pointPercent;  };    #endif // PICTRUEITEM_H

  //pictrueitem.cpp  #include "pictrueitem.h"  #include <QGraphicsSceneMouseEvent>  #include <QPainter>  #include <QDebug>  PictrueItem::PictrueItem(QGraphicsItem *parent)    :QGraphicsObject(parent),     isPressed(false),     mode(Qt::SmoothTransformation),     m_type(0),     m_id(0),     m_pointPercent((qreal)0.0)  {    }    PictrueItem::PictrueItem(const QPixmap &pixmap, QGraphicsItem *parent)    :QGraphicsObject(parent),     isPressed(false),     mode(Qt::SmoothTransformation),     m_type(0)  {    m_pixmap = pixmap;  }    PictrueItem::~PictrueItem()  {    }    void PictrueItem::setPixmap(const QPixmap &pixmap)  {    prepareGeometryChange();    m_pixmap = pixmap;    update();  }    QPixmap PictrueItem::pixmap() const  {    return m_pixmap;  }    QRectF PictrueItem::boundingRect() const  {    if(m_pixmap.isNull())      return QRectF();    return QRectF(m_offset, m_pixmap.size() / m_pixmap.devicePixelRatio());  }    void PictrueItem::setTransformationMode(Qt::TransformationMode mode)  {    if (mode != this->mode)    {      this->mode = mode;      update();    }  }    QPointF PictrueItem::offset() const  {    return m_offset;  }    void PictrueItem::setOffset(const QPointF &offset)  {    m_offset = offset;    if (m_offset == offset)      return;    prepareGeometryChange();    m_offset = offset;    update();  }    int PictrueItem::type() const  {    return m_type;  }    void PictrueItem::setType(int type)  {    m_type = type;  }    int PictrueItem::itemId() const  {    return m_id;  }    void PictrueItem::setItemId(int id)  {    m_id = id;  }      void PictrueItem::mousePressEvent(QGraphicsSceneMouseEvent *event)  {    //只响应鼠标左键    if(event->button() == Qt::LeftButton)    {      pressedScenePoint = event->pos();      isPressed = true;      }  }    void PictrueItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)  {    if(event->button() == Qt::LeftButton){      if(isPressed &&          boundingRect().contains(event->pos()) &&          boundingRect().contains(pressedScenePoint))      {        isPressed = false;        emit clicked();        emit clickedId(type());      }    }  }    void PictrueItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)  {    Q_UNUSED(widget);    Q_UNUSED(option);    painter->setRenderHint(QPainter::SmoothPixmapTransform,                (this->mode == Qt::SmoothTransformation));      painter->drawPixmap(m_offset, m_pixmap);    }

  //pictrueview.h  #ifndef PICTRUEVIEW_H  #define PICTRUEVIEW_H  #include <QGraphicsView>    class PictrueView : public QGraphicsView  {    Q_OBJECT    public:    PictrueView(QWidget *parent = Q_NULLPTR);    virtual ~PictrueView();  protected:    void resizeEvent(QResizeEvent *event);  public:  Q_SIGNALS:    void sizeChanged(const QSize &);  };    #endif // PICTRUEVIEW_H

  //pictrueview.cpp  #include "pictrueview.h"  #include <QResizeEvent>  PictrueView::PictrueView(QWidget *parent)    :QGraphicsView(parent)  {    }    PictrueView::~PictrueView()  {    //none  }    void PictrueView::resizeEvent(QResizeEvent *event)  {    emit sizeChanged(event->size());    return QGraphicsView::resizeEvent(event);  }

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