Allow several classes of Level Meters sharing the same base algorithms. Initiate with the VU meter

plugins/channeltx/modam/ammodgui.ui

@@ -357,7 +357,7 @@
        </widget>
       </item>
       <item>
-       <widget class="LevelMeter" name="volumeMeter" native="true">
+       <widget class="LevelMeterVU" name="volumeMeter" native="true">
         <property name="sizePolicy">
          <sizepolicy hsizetype="Expanding" vsizetype="Preferred">
           <horstretch>0</horstretch>
@@ -662,7 +662,7 @@
    <header>gui/buttonswitch.h</header>
   </customwidget>
   <customwidget>
-   <class>LevelMeter</class>
+   <class>LevelMeterVU</class>
    <extends>QWidget</extends>
    <header>gui/levelmeter.h</header>
    <container>1</container>

plugins/channeltx/modnfm/nfmmodgui.ui

@@ -381,7 +381,7 @@
        </widget>
       </item>
       <item>
-       <widget class="LevelMeter" name="volumeMeter" native="true">
+       <widget class="LevelMeterVU" name="volumeMeter" native="true">
         <property name="sizePolicy">
          <sizepolicy hsizetype="Expanding" vsizetype="Preferred">
           <horstretch>0</horstretch>
@@ -686,7 +686,7 @@
    <header>gui/buttonswitch.h</header>
   </customwidget>
   <customwidget>
-   <class>LevelMeter</class>
+   <class>LevelMeterVU</class>
    <extends>QWidget</extends>
    <header>gui/levelmeter.h</header>
    <container>1</container>

sdrbase/gui/levelmeter.cpp

@@ -132,7 +132,16 @@ void LevelMeter::paintEvent(QPaintEvent *event)
     render(&painter);
 }
 
-void LevelMeter::render(QPainter *painter)
+LevelMeterVU::LevelMeterVU(QWidget *parent) :
+        LevelMeter(parent)
+{
+}
+
+LevelMeterVU::~LevelMeterVU()
+{
+}
+
+void LevelMeterVU::render(QPainter *painter)
 {
     painter->fillRect(rect(), QColor(42, 42, 42, 255));
 

sdrbase/gui/levelmeter.h

@@ -60,8 +60,8 @@ class LevelMeter : public QWidget
     Q_OBJECT
 
 public:
-    explicit LevelMeter(QWidget *parent = 0);
-    ~LevelMeter();
+    LevelMeter(QWidget *parent = 0);
+    virtual ~LevelMeter();
 
     void paintEvent(QPaintEvent *event);
 
@@ -69,10 +69,10 @@ public slots:
     void reset();
     void levelChanged(qreal rmsLevel, qreal peakLevel, int numSamples);
 
-private slots:
+protected slots:
     void redrawTimerExpired();
 
-private:
+protected:
     /**
      * Height of RMS level bar.
      * Range 0.0 - 1.0.
@@ -120,7 +120,17 @@ private:
     QColor m_peakColor;
     QColor m_decayedPeakColor;
 
-    void render(QPainter *painter);
+    virtual void render(QPainter *painter) = 0;
 };
 
+class LevelMeterVU : public LevelMeter
+{
+public:
+    LevelMeterVU(QWidget *parent = 0);
+    virtual ~LevelMeterVU();
+protected:
+    virtual void render(QPainter *painter);
+};
+
+
 #endif /* SDRBASE_GUI_LEVELMETER_H_ */