DANodeLinkPointDrawDelegate.h

#ifndef DANODELINKPOINTDRAWDELEGATE_H
#define DANODELINKPOINTDRAWDELEGATE_H
#include "DAWorkFlowAPI.h"
#include "DANodeLinkPoint.h"
#include <QPainterPath>
namespace DA
{
 
class DAAbstractNodeGraphicsItem;
class DAWORKFLOW_API DANodeLinkPointDrawDelegate
{
    DA_DECLARE_PRIVATE(DANodeLinkPointDrawDelegate)
public:
    DANodeLinkPointDrawDelegate(DAAbstractNodeGraphicsItem* i = nullptr);
    virtual ~DANodeLinkPointDrawDelegate();
    // 设置item
    void setItem(DAAbstractNodeGraphicsItem* i);
    DAAbstractNodeGraphicsItem* getItem() const;
    // 绘制连接点
    void paintLinkPoints(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget);
    // 显示连接点的文字
    void showLinkPointText(bool on);
    bool isShowLinkPointText() const;
 
public:
    // 重新计算linkpoint的信息
    virtual void layoutLinkPoints(QList< DA::DANodeLinkPoint >& lps, const QRectF& bodyRect);
    // 获取连接点的矩形绘图区域范围
    //  此函数会影响到场景链接过程选中的状态，比较关键，决定了DANodeGraphicsScene::nodeItemLinkPointSelected能否发射,paintLinkPoint函数会调用此函数确定绘图区域
    virtual QPainterPath getlinkPointPainterRegion(const DANodeLinkPoint& pl) const;
    // 获取连接点,正常情况，不需要继承此函数，此函数只有比较特殊的情况继承
    virtual QList< DANodeLinkPoint > getLinkPoints() const;
    // 绘制连接点
    virtual void paintLinkPoints(const QList< DANodeLinkPoint >& pls,
                                 QPainter* painter,
                                 const QStyleOptionGraphicsItem* option,
                                 QWidget* widget);
    // 绘制连接点文本，会先绘制连接点，再绘制连接点文本
    virtual void paintLinkPointTexts(const QList< DANodeLinkPoint >& pls,
                                     QPainter* painter,
                                     const QStyleOptionGraphicsItem* option,
                                     QWidget* widget);
 
protected:
    // 绘制某个连接点
    virtual void paintLinkPoint(const DANodeLinkPoint& pl,
                                QPainter* painter,
                                const QStyleOptionGraphicsItem* option,
                                QWidget* widget);
    virtual void paintLinkPointText(const DANodeLinkPoint& pl,
                                    QPainter* painter,
                                    const QStyleOptionGraphicsItem* option,
                                    QWidget* widget);
};
 
}  // end of namespace DA
#endif  // DANODELINKPOINTDRAWDELEGATE_H