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1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
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2
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3 /*
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4 EasyMercurial
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5
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6 Based on HgExplorer by Jari Korhonen
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7 Copyright (c) 2010 Jari Korhonen
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Chris@644
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8 Copyright (c) 2013 Chris Cannam
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9 Copyright (c) 2013 Queen Mary, University of London
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10
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11 This program is free software; you can redistribute it and/or
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12 modify it under the terms of the GNU General Public License as
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13 published by the Free Software Foundation; either version 2 of the
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14 License, or (at your option) any later version. See the file
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15 COPYING included with this distribution for more information.
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16 */
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17
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18 #ifndef _PANNED_H_
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19 #define _PANNED_H_
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20
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21 #include <QGraphicsView>
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22
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23 class QWheelEvent;
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24 class QEvent;
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25 class QTimer;
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26
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27 class Panned : public QGraphicsView
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28 {
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29 Q_OBJECT
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30
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31 public:
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32 Panned();
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33 virtual ~Panned() { }
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34
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35 virtual void setScene(QGraphicsScene *s);
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36
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37 signals:
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38 void pannedRectChanged(QRectF);
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39 void wheelEventReceived(QWheelEvent *);
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40 void pannedContentsScrolled();
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41 void mouseLeaves();
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42
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43 public slots:
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44 void slotSetPannedRect(QRectF);
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45 void slotEmulateWheelEvent(QWheelEvent *ev);
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46
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47 void zoomIn();
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48 void zoomOut();
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49
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50 private slots:
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51 void dragTimerTimeout();
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52
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53 protected:
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54 QRectF m_pannedRect;
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55
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56 QPoint m_lastDragPos;
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57 QPoint m_lastDragStart;
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58 QPoint m_lastOrigin;
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59 QPointF m_velocity;
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60 bool m_dragging;
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61 int m_dragTimerMs;
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62 QTimer *m_dragTimer;
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63
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64 enum DragDirection {
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65 UnknownDrag,
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66 HorizontalDrag,
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67 VerticalDrag,
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68 FreeDrag
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69 };
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70 DragDirection m_dragDirection;
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71 void updateDragDirection(QPoint);
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72
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73 virtual void mousePressEvent(QMouseEvent *);
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74 virtual void mouseMoveEvent(QMouseEvent *);
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75 virtual void mouseReleaseEvent(QMouseEvent *);
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76
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77 virtual void paintEvent(QPaintEvent *);
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78 virtual void resizeEvent(QResizeEvent *);
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79 virtual void drawForeground(QPainter *, const QRectF &);
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80 virtual void wheelEvent(QWheelEvent *);
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81 virtual void leaveEvent(QEvent *);
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82 };
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83
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84 #endif
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85
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