legendoverlay.h

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#ifndef OPENSWMMVIS_UI_WIDGETS_LEGENDOVERLAY_H
#define OPENSWMMVIS_UI_WIDGETS_LEGENDOVERLAY_H
 
#include <QPoint>
#include <QPointer>
#include <QRect>
#include <QSize>
#include <QVector>
#include <QWidget>
 
class MapCanvas;
class OpenSWMMVisLayer;
 
namespace OpenSWMM::Render { class LegendOverlayStyle; }
 
namespace openswmmvis::ui {
 
class LegendOverlay : public QWidget
{
    Q_OBJECT
public:
    explicit LegendOverlay(MapCanvas *canvas);
    ~LegendOverlay() override;
 
    void setCanvas(MapCanvas *canvas);
 
    OpenSWMM::Render::LegendOverlayStyle *style() const noexcept { return m_style; }
 
    void setStyle(OpenSWMM::Render::LegendOverlayStyle *style, bool takeOwnership = false);
 
signals:
    void hideRequested();
 
protected:
    void paintEvent(QPaintEvent *event)               override;
    void mousePressEvent(QMouseEvent *event)         override;
    void mouseMoveEvent(QMouseEvent *event)          override;
    void mouseReleaseEvent(QMouseEvent *event)       override;
    void contextMenuEvent(QContextMenuEvent *event)   override;
    bool eventFilter(QObject *watched, QEvent *event) override;
 
private slots:
    void onStyleChanged();
    void openPropertiesDialog();
    void copyLegendImage();
    void resetLayout();
    void autoSize();   
 
private:
    void recomputeLayout();
    void clampInsideCanvas();
    void anchorToCanvas();   // re-place per style().anchor() if not Free.
 
    // ── Slice US.B2 — interactive resize ────────────────────────────────
    [[nodiscard]] int edgesAt(const QPoint &pos) const;
    void updateCursor(int edges);
    void connectLayer(OpenSWMMVisLayer *layer);
    void disconnectLayer(OpenSWMMVisLayer *layer);
 
    struct ItemBand {
        QString classKey;   // renderer's per-class identifier; empty = no per-class edit
        int     yTop    = 0;
        int     yBottom = 0;
    };
    struct LayerBand {
        QPointer<OpenSWMMVisLayer> layer;
        int yTop    = 0;   // header top in widget coords
        int yBottom = 0;   // bottom of the last row of this layer
        QVector<ItemBand> items;   // per-row bands inside this layer's section
    };
 
    OpenSWMMVisLayer *layerAtY(int y) const;
 
    QPair<OpenSWMMVisLayer *, QString> itemAtY(int y) const;
 
    QPointer<MapCanvas>                       m_canvas;
    OpenSWMM::Render::LegendOverlayStyle     *m_style          = nullptr;
    bool                                      m_ownsStyle      = false;
    QPoint                                    m_dragStartOffset;
    bool                                      m_dragging       = false;
    bool                                      m_positioned     = false;  
    QVector<LayerBand>                        m_layerBands;              
 
    // Slice US.B2 — interactive resize state.
    int    m_resizeEdges     = 0;       
    QRect  m_resizeStartGeom;           
    QPoint m_resizeStartGlobal;         
    bool   m_resizing        = false;   
};
 
} // namespace openswmmvis::ui
 
#endif // OPENSWMMVIS_UI_WIDGETS_LEGENDOVERLAY_H