diagrameventaddpath.h

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/*
        Copyright 2006-2026 The QElectroTech Team
        This file is part of QElectroTech.
 
        QElectroTech is free software: you can redistribute it and/or modify
        it under the terms of the GNU General Public License as published by
        the Free Software Foundation, either version 2 of the License, or
        (at your option) any later version.
 
        QElectroTech is distributed in the hope that it will be useful,
        but WITHOUT ANY WARRANTY; without even the implied warranty of
        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        GNU General Public License for more details.
 
        You should have received a copy of the GNU General Public License
        along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef DIAGRAMEVENTADDPATH_H
#define DIAGRAMEVENTADDPATH_H
 
#include "../qetgraphicsitem/qetshapeitem.h"
#include "diagrameventinterface.h"
 
class QGraphicsLineItem;

class DiagramEventAddPath : public DiagramEventInterface
{
                Q_OBJECT
 
        public:
                DiagramEventAddPath(Diagram *diagram);
                ~DiagramEventAddPath() override;
 
                void mousePressEvent       (QGraphicsSceneMouseEvent *event) override;
                void mouseMoveEvent        (QGraphicsSceneMouseEvent *event) override;
                void mouseReleaseEvent     (QGraphicsSceneMouseEvent *event) override;
                void mouseDoubleClickEvent (QGraphicsSceneMouseEvent *event) override;
                void keyPressEvent         (QKeyEvent *event) override;
                void init() override;
 
        private:
                void updateHelpCross (const QPointF &p);
                void showHint () const;
                void finishPath (bool closed);
                void cancelPath ();
                bool nearFirstNode (const QPointF &scenePos) const;
                int  confirmedNodeCount () const;   // m_nodes always carries one trailing "preview" node while running; this excludes it
                QPointF snapped (const QPointF &scenePos, Qt::KeyboardModifiers mods) const;
 
                QetShapeItem                    *m_shape_item;
                QVector<QetShapeItem::PathNode>  m_nodes;
                int                               m_dragging_node = -1;
                QGraphicsLineItem                *m_help_horiz, *m_help_verti;
 
                // Scene units within which a click on an existing path is
                // treated as "on the first node" and closes the shape, rather
                // than adding yet another node right next to it.
                static constexpr qreal CLOSE_THRESHOLD = 12.0;
};
 
#endif // DIAGRAMEVENTADDPATH_H