sectionpreviewwidget.h

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#ifndef OPENSWMMVIS_SECTIONVIEW_SECTIONPREVIEWWIDGET_H
#define OPENSWMMVIS_SECTIONVIEW_SECTIONPREVIEWWIDGET_H
 
#include <QPointF>
#include <QRectF>
#include <QWidget>
 
#include "ui/sectionview/sectiondiagram.h"
 
namespace openswmmvis::sectionview {
 
class SectionPreviewWidget : public QWidget
{
    Q_OBJECT
 
public:
    explicit SectionPreviewWidget(QWidget *parent = nullptr);
 
    void setModel(SectionDiagramModel model);
 
    [[nodiscard]] const SectionDiagramModel &model() const noexcept
    { return m_model; }
 
    void setPlaceholderText(const QString &text);
 
    [[nodiscard]] QImage renderToImage(const QSize &size) const;
 
    // ---- View ---------------------------------------------------------------
    //
    // Navigation matches the map canvas so the gestures transfer:
    //   wheel                 → zoom about the cursor
    //   middle-button drag    → pan
    //   middle double-click   → zoom to extents
    //
    // Zoom scales the GEOMETRY only; labels keep their point size, which is what
    // makes zooming a legibility tool — the drawing spreads out from under
    // crowded dimension text instead of magnifying the crowding.
 
    [[nodiscard]] const DiagramViewport &viewport() const noexcept
    { return m_viewport; }
 
    void setViewport(const DiagramViewport &viewport);
 
    void zoomToExtents();
 
    void zoomBy(double factor, const QPointF &anchorPx);
 
    [[nodiscard]] double achievedVerticalExaggeration() const noexcept
    { return m_achievedVE; }
 
    [[nodiscard]] QRectF lastFitRect() const noexcept { return m_lastFitRect; }
 
signals:
    void viewportChanged(const DiagramViewport &viewport);
 
protected:
    void paintEvent(QPaintEvent *event) override;
    void wheelEvent(QWheelEvent *event) override;
    void mousePressEvent(QMouseEvent *event) override;
    void mouseMoveEvent(QMouseEvent *event) override;
    void mouseReleaseEvent(QMouseEvent *event) override;
    void mouseDoubleClickEvent(QMouseEvent *event) override;
 
private:
    SectionDiagramModel m_model;
    QString             m_placeholder;
 
    DiagramViewport m_viewport;
    mutable QRectF  m_lastFitRect;
    mutable double  m_achievedVE = 1.0;
    bool            m_panning = false;
    QPointF         m_panAnchorPx;      
    QPointF         m_panStartOffset;   
};
 
} // namespace openswmmvis::sectionview
 
#endif // OPENSWMMVIS_SECTIONVIEW_SECTIONPREVIEWWIDGET_H