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25 
26 #pragma once
27 
28 #include <QGraphicsRectItem>
29 
30 #include "arrowitem.h"
31 
32 #include <QHash>
33 
34 namespace qmt {
35 
36 class DiagramSceneModel;
37 class IRelationable;
38 
39 class RelationStarter : public QGraphicsRectItem
40 {
41 public:
42     RelationStarter(IRelationable *owner, DiagramSceneModel *diagramSceneModel,
43                     QGraphicsItem *parent = nullptr);
44     ~RelationStarter() override;
45 
46     QRectF boundingRect() const override;
47     void paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
48                QWidget *widget = nullptr) override;
49 
50     void addArrow(const QString &id, ArrowItem::Shaft shaft, ArrowItem::Head startHead,
51                   ArrowItem::Head endHead,
52                   const QString &toolTip = QString());
53 
54 protected:
55     void mousePressEvent(QGraphicsSceneMouseEvent *event) override;
56     void mouseMoveEvent(QGraphicsSceneMouseEvent *event) override;
57     void mouseReleaseEvent(QGraphicsSceneMouseEvent *event) override;
58     void keyPressEvent(QKeyEvent *event) override;
59     void focusOutEvent(QFocusEvent *event) override;
60 
61 private:
62     void updateCurrentPreviewArrow(const QPointF &headPoint);
63 
64     IRelationable *m_owner = nullptr;
65     DiagramSceneModel *m_diagramSceneModel = nullptr;
66     QList<ArrowItem *> m_arrows;
67     QHash<ArrowItem *, QString> m_arrowIds;
68     ArrowItem *m_currentPreviewArrow = nullptr;
69     QString m_currentPreviewArrowId;
70     QList<QPointF> m_currentPreviewArrowIntermediatePoints;
71 };
72 
73 } // namespace qmt
74