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1 /* -*- c-basic-offset: 4 -*- vi:set ts=8 sts=4 sw=4: */
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2
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3 /*
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4 A waveform viewer and audio annotation editor.
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5 Chris Cannam, Queen Mary University of London, 2005-2006
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6
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7 This is experimental software. Not for distribution.
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8 */
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9
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10 #ifndef _VIEW_MANAGER_H_
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11 #define _VIEW_MANAGER_H_
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12
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13 #include <QObject>
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14 #include <QTimer>
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15
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16 #include <map>
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17 #include <set>
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18
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19 #include "Selection.h"
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20
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21 class AudioPlaySource;
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22 class PlayParameters;
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23 class Model;
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24
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25 /**
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26 * The ViewManager manages properties that may need to be synchronised
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27 * between separate Views. For example, it handles signals associated
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28 * with changes to the global pan and zoom. It also handles playback
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29 * properties and play synchronisation.
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30 *
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31 * Views should be implemented in such a way as to work
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32 * correctly whether they are supplied with a ViewManager or not.
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33 */
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34
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35 class ViewManager : public QObject
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36 {
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37 Q_OBJECT
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38
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39 public:
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40 ViewManager();
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41
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42 void setAudioPlaySource(AudioPlaySource *source);
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43
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44 //!!! No way to remove a model!
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45 PlayParameters *getPlayParameters(const Model *model);
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46 void clearPlayParameters();
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47
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48 bool isPlaying() const;
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49
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50 unsigned long getGlobalCentreFrame() const;
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51 unsigned long getGlobalZoom() const;
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52
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53 typedef std::set<Selection> SelectionList;
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54
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55 bool haveInProgressSelection() const;
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56 const Selection &getInProgressSelection(bool &exclusive) const;
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57 void setInProgressSelection(const Selection &selection, bool exclusive);
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58 void clearInProgressSelection();
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59
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60 const SelectionList &getSelections() const;
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61 void setSelection(const Selection &selection);
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62 void addSelection(const Selection &selection);
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63 void removeSelection(const Selection &selection);
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64 void clearSelections();
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65
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66 enum ToolMode {
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67 NavigateMode,
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68 SelectMode,
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69 EditMode,
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70 DrawMode,
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71 TextMode
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72 };
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73 ToolMode getToolMode() const { return m_toolMode; }
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74 void setToolMode(ToolMode mode);
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75
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76 signals:
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77 /** Emitted when a widget pans. The originator identifies the widget. */
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78 void centreFrameChanged(void *originator, unsigned long frame, bool locked);
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79
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80 /** Emitted when a widget zooms. The originator identifies the widget. */
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81 void zoomLevelChanged(void *originator, unsigned long zoom, bool locked);
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82
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83 /** Emitted when the playback frame changes. */
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84 void playbackFrameChanged(unsigned long frame);
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85
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86 /** Emitted when the output levels change. Values in range 0.0 -> 1.0. */
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87 void outputLevelsChanged(float left, float right);
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88
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89 /** Emitted when the selection has changed. */
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90 void selectionChanged();
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91
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92 /** Emitted when the tool mode has been changed. */
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93 void toolModeChanged();
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94
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95 protected slots:
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96 void checkPlayStatus();
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97 void considerSeek(void *, unsigned long, bool);
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98 void considerZoomChange(void *, unsigned long, bool);
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99
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100 protected:
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101 AudioPlaySource *m_playSource;
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102 unsigned long m_globalCentreFrame;
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103 unsigned long m_globalZoom;
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104
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105 float m_lastLeft;
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106 float m_lastRight;
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107
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108 SelectionList m_selections;
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109 Selection m_inProgressSelection;
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110 bool m_inProgressExclusive;
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111
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112 ToolMode m_toolMode;
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113
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114 std::map<const Model *, PlayParameters *> m_playParameters;
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115 };
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116
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117 #endif
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118
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