diff widgets/LevelPanWidget.h @ 923:2a9f1eb6e0ed tonioni

Try adding a combined simple level/pan widget

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widgets/LevelPanWidget.h	Tue Mar 24 14:40:31 2015 +0000
@@ -0,0 +1,81 @@
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Sonic Visualiser
+    An audio file viewer and annotation editor.
+    Centre for Digital Music, Queen Mary, University of London.
+    
+    This program 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.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+#ifndef LEVEL_PAN_WIDGET_H
+#define LEVEL_PAN_WIDGET_H
+
+#include <QWidget>
+
+/**
+ * A simple widget for coarse level and pan control.
+ *
+ * For this initial implementation at least, pan is in five steps only
+ * (hard left, mid-left, centre, mid-right, hard right) and level is
+ * in five plus mute.
+ */
+
+class LevelPanWidget : public QWidget
+{
+    Q_OBJECT
+
+public:
+    LevelPanWidget(QWidget *parent = 0);
+    ~LevelPanWidget();
+    
+    /// Return level as a gain value in the range [0,1]
+    float getLevel() const; 
+    
+    /// Return pan as a value in the range [-1,1]
+    float getPan() const;
+
+    /// Find out whether the widget is editable
+    bool isEditable() const;
+
+public slots:
+    /// Set level in the range [0,1] -- will be rounded
+    void setLevel(float);
+
+    /// Set pan in the range [-1,1] -- will be rounded
+    void setPan(float);
+
+    /// Specify whether the widget is editable or read-only (default editable)
+    void setEditable(bool);
+    
+signals:
+    void levelChanged(float);
+    void panChanged(float);
+
+protected:
+    virtual void mousePressEvent(QMouseEvent *ev);
+    virtual void mouseMoveEvent(QMouseEvent *ev);
+    virtual void mouseReleaseEvent(QMouseEvent *ev);
+    virtual void wheelEvent(QWheelEvent *ev);
+    virtual void paintEvent(QPaintEvent *ev);
+
+    void emitLevelChanged();
+    void emitPanChanged();
+    
+    int m_level;
+    int m_pan;
+    bool m_editable;
+
+    QSizeF cellSize() const;
+    QPointF cellCentre(int level, int pan) const;
+    QSizeF cellLightSize() const;
+    QRectF cellLightRect(int level, int pan) const;
+    double thinLineWidth() const;
+    void toCell(QPointF loc, int &level, int &pan) const;
+};
+
+#endif