Disabled state only draws border

Plus a few API tweaks

src/ui/designer/QGCRadioChannelDisplay.cpp

@@ -70,9 +70,11 @@ void QGCRadioChannelDisplay::paintEvent(QPaintEvent *event)
         painter.setBrush(Qt::SolidPattern);
 
         //draw the text value of the widget, and its label
-        QString valStr = QString::number(m_value);
         painter.setPen(QColor::fromRgb(255,255,255));
         painter.drawText((width()/2.0) - (painter.fontMetrics().width(m_name)/2.0),((height()-3) - (fontHeight*1)),m_name);
+
+        if (isEnabled()) {
+            QString valStr = QString::number(m_value);
             painter.drawText((width()/2.0) - (painter.fontMetrics().width(valStr)/2.0),((height()-3) - (fontHeight * 0)),valStr);
 
             painter.setPen(QColor::fromRgb(128,128,64));
@@ -109,6 +111,7 @@ void QGCRadioChannelDisplay::paintEvent(QPaintEvent *event)
 
             }
         }
+    }
     else //horizontal orientation
     {
         QLinearGradient hGradientBrush(0, 0, this->width(), this->height());
@@ -123,10 +126,11 @@ void QGCRadioChannelDisplay::paintEvent(QPaintEvent *event)
 
         //draw the value string
         painter.setPen(QColor::fromRgb(255,255,255));
-        QString valstr = QString::number(m_value);
         painter.drawText((width()/2.0) - (painter.fontMetrics().width(m_name)/2.0),((height()-3) - (fontHeight*1)),m_name);
-        painter.drawText((width()/2.0) - (painter.fontMetrics().width(valstr)/2.0),((height()-3) - (fontHeight * 0)),valstr);
 
+        if (isEnabled()) {
+            QString valstr = QString::number(m_value);
+            painter.drawText((width()/2.0) - (painter.fontMetrics().width(valstr)/2.0),((height()-3) - (fontHeight * 0)),valstr);
 
             painter.setPen(QColor::fromRgb(0,128,0));
             painter.setBrush(hGradientBrush);
@@ -154,6 +158,7 @@ void QGCRadioChannelDisplay::paintEvent(QPaintEvent *event)
                 painter.drawText((width() * ((float)m_max / 3000.0)) - (painter.fontMetrics().width(maxstr)/2.0),((height()-3) - (painter.fontMetrics().height() * 0)),maxstr);
             }
         }
+    }
 }
 
 void QGCRadioChannelDisplay::setValue(int value)
@@ -173,9 +178,9 @@ void QGCRadioChannelDisplay::setValue(int value)
     update();
 }
 
-void QGCRadioChannelDisplay::showMinMax()
+void QGCRadioChannelDisplay::showMinMax(bool show)
 {
-    m_showMinMax = true;
+    m_showMinMax = show;
     update();
 }
 

src/ui/designer/QGCRadioChannelDisplay.h

@@ -10,8 +10,9 @@ public:
     explicit QGCRadioChannelDisplay(QWidget *parent = 0);
     void setOrientation(Qt::Orientation orient);
     void setValue(int value);
-    void showMinMax();
+    void showMinMax(bool show = true);
     void hideMinMax();
+    bool isMinMaxShown() { return m_showMinMax; }
     void setValueAndRange(int val, int min, int max);
     void setMinMax(int min, int max);
     void setMin(int value);