swmmlayeritem.h

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#ifndef SWMMLAYERITEM_H
#define SWMMLAYERITEM_H
 
#include <QGraphicsItem>
#include <QPointer>
#include <QString>
#include <QVector>
 
class SWMMModelLayer;
 
static constexpr int SWMMLayerItemType = QGraphicsItem::UserType + 20;
 
class SWMMLayerItem : public QGraphicsItem
{
public:
    explicit SWMMLayerItem(SWMMModelLayer *layer,
                           QGraphicsItem *parent = nullptr);
    ~SWMMLayerItem() override = default;
 
    int type() const override { return SWMMLayerItemType; }
 
    void refreshBoundingRect();
 
    QRectF boundingRect() const override { return m_boundingRect; }
 
    void paint(QPainter *painter,
               const QStyleOptionGraphicsItem *option,
               QWidget *widget) override;
 
    SWMMModelLayer *ownerLayer() const { return m_layer.data(); }
 
private:
    QPointer<SWMMModelLayer> m_layer;
    QRectF                   m_boundingRect;   // scene-space, cached
 
    struct LabelTextCache {
        quint64 editRev = ~0ull;                 // layer epoch at build time
        QString expression, fieldName, priorityField;
        QVector<QString> text[4];                // 0=node 1=link 2=catch 3=gage
        QVector<double>  priority[4];
        void clear()
        {
            for (auto &t : text)     t.clear();
            for (auto &p : priority) p.clear();
        }
    };
    LabelTextCache m_labelCache;
};
 
#endif // SWMMLAYERITEM_H