comparison base/ViewManager.h @ 0:da6937383da8

initial import

+/* -*- c-basic-offset: 4 -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    A waveform viewer and audio annotation editor.
+    Chris Cannam, Queen Mary University of London, 2005
+    
+    This is experimental software.  Not for distribution.
+*/
+
+#ifndef _VIEW_MANAGER_H_
+#define _VIEW_MANAGER_H_
+
+#include <QObject>
+#include <QTimer>
+
+#include <map>
+
+class AudioPlaySource;
+class PlayParameters;
+class Model;
+
+/**
+ * The ViewManager manages properties that may need to be synchronised
+ * between separate Views.  For example, it handles signals associated
+ * with changes to the global pan and zoom.  It also handles playback
+ * properties and play synchronisation.
+ *
+ * Views should be implemented in such a way as to work
+ * correctly whether they are supplied with a ViewManager or not.
+ */
+
+class ViewManager : public QObject
+{
+    Q_OBJECT
+
+public:
+    ViewManager();
+
+    void setAudioPlaySource(AudioPlaySource *source);
+
+//!!! No way to remove a model!
+    PlayParameters *getPlayParameters(const Model *model);
+    void clearPlayParameters();
+
+    unsigned long getGlobalCentreFrame() const;
+    unsigned long getGlobalZoom() const;
+
+signals:
+    /** Emitted when a widget pans.  The originator identifies the widget. */
+    void centreFrameChanged(void *originator, unsigned long frame, bool locked);
+
+    /** Emitted when a widget zooms.  The originator identifies the widget. */
+    void zoomLevelChanged(void *originator, unsigned long zoom, bool locked);
+
+    /** Emitted when the playback frame changes. */
+    void playbackFrameChanged(unsigned long frame);
+
+    /** Emitted when the output levels change. Values in range 0.0 -> 1.0. */
+    void outputLevelsChanged(float left, float right);
+
+protected slots:
+    void checkPlayStatus();
+    void considerSeek(void *, unsigned long, bool);
+    void considerZoomChange(void *, unsigned long, bool);
+
+protected:
+    AudioPlaySource *m_playSource;
+    unsigned long m_globalCentreFrame;
+    unsigned long m_globalZoom;
+
+    float m_lastLeft;
+    float m_lastRight;
+
+    std::map<const Model *, PlayParameters *> m_playParameters;
+};
+
+#endif
+