SceneInteraction.h

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// Copyright 2015 - 2026, GIBIS-UNIFESP and the wiRedPanda contributors
// SPDX-License-Identifier: GPL-3.0-or-later

 
#pragma once
 
#include <utility>
 
#include <QElapsedTimer>
#include <QGraphicsRectItem>
#include <QList>
#include <QPointer>
#include <QPointF>
 
class GraphicElement;
class QGraphicsSceneMouseEvent;
class Scene;
class ThemeAttributes;

class SceneInteraction
{
public:
    explicit SceneInteraction(Scene *scene);

    void attachToScene();

    bool mousePress(QGraphicsSceneMouseEvent *event);
    bool mouseMove(QGraphicsSceneMouseEvent *event);
    bool mouseRelease(QGraphicsSceneMouseEvent *event);
    bool mouseDoubleClick(QGraphicsSceneMouseEvent *event);

    [[nodiscard]] QPointF lastMousePos() const { return m_mousePos; }

    [[nodiscard]] bool isDraggingElement() const { return m_draggingElement; }

    void applyTheme(const ThemeAttributes &theme);
 
private:
    void startSelectionRect();
 
    Scene *m_scene;
 
    QGraphicsRectItem m_selectionRect;
    QElapsedTimer m_timer;
    QPointF m_mousePos;
    QPointF m_selectionStartPoint;

    QList<std::pair<QPointer<GraphicElement>, QPointF>> m_dragSnapshot;
    bool m_draggingElement = false;
    bool m_markingSelectionBox = false;
};