Gui: modernize C++11

* remove redundant void-arg
* use nullptr

src/Gui/SoFCColorBar.cpp

@@ -56,7 +56,7 @@ SoFCColorBarBase::~SoFCColorBarBase()
 }
 
 // doc from parent
-void SoFCColorBarBase::initClass(void)
+void SoFCColorBarBase::initClass()
 {
     SO_NODE_INIT_ABSTRACT_CLASS(SoFCColorBarBase,SoSeparator,"Separator");
 }
@@ -85,7 +85,7 @@ class SoFCColorBarProxyObject : public QObject
 {
 public:
     SoFCColorBarProxyObject(SoFCColorBar* b)
-        : QObject(0), bar(b) {}
+        : QObject(nullptr), bar(b) {}
     ~SoFCColorBarProxyObject() {}
     void customEvent(QEvent *)
     {
@@ -137,7 +137,7 @@ SoFCColorBar::~SoFCColorBar()
 }
 
 // doc from parent
-void SoFCColorBar::initClass(void)
+void SoFCColorBar::initClass()
 {
     SO_NODE_INIT_CLASS(SoFCColorBar,SoFCColorBarBase,"Separator");
 }
@@ -186,12 +186,12 @@ bool SoFCColorBar::isVisible (float fVal) const
     return this->getActiveBar()->isVisible(fVal);
 }
 
-float SoFCColorBar::getMinValue (void) const
+float SoFCColorBar::getMinValue () const
 {
     return this->getActiveBar()->getMinValue();
 }
 
-float SoFCColorBar::getMaxValue (void) const
+float SoFCColorBar::getMaxValue () const
 {
     return this->getActiveBar()->getMaxValue();
 }

src/Gui/SoFCColorBar.h

@@ -50,8 +50,8 @@ class GuiExport SoFCColorBarBase : public SoSeparator, public App::ValueFloatToR
   SO_NODE_ABSTRACT_HEADER(Gui::SoFCColorBarBase);
 
 public:
-  static void initClass(void);
-  static void finish(void);
+  static void initClass();
+  static void finish();
 
   virtual void GLRenderBelowPath ( SoGLRenderAction *action );
 
@@ -86,12 +86,12 @@ public:
    *
    * This method must be implemented in subclasses.
    */
-  virtual float getMinValue (void) const = 0;
+  virtual float getMinValue () const = 0;
   /** Returns the current maximum of the parameter range.
    *
    * This method must be implemented in subclasses.
    */
-  virtual float getMaxValue (void) const = 0;
+  virtual float getMaxValue () const = 0;
   /**
    * Opens a dialog to customize the current settings of the color bar.
    * Returns true if the settings have been changed, false otherwise.
@@ -113,7 +113,7 @@ protected:
    */
   virtual void setViewportSize( const SbVec2s& size ) = 0;
 
-  SoFCColorBarBase (void);
+  SoFCColorBarBase ();
   virtual ~SoFCColorBarBase ();
 
 private:
@@ -132,9 +132,9 @@ class GuiExport SoFCColorBar : public SoFCColorBarBase, public Base::Subject<int
   SO_NODE_HEADER(Gui::SoFCColorBar);
 
 public:
-  static void initClass(void);
-  static void finish(void);
-  SoFCColorBar(void);
+  static void initClass();
+  static void finish();
+  SoFCColorBar();
 
   /**
    * Returns the currently active color bar object.
@@ -164,11 +164,11 @@ public:
   /**
    * Returns the current minimum of the parameter range of the currently active color bar.
    */
-  float getMinValue (void) const;
+  float getMinValue () const;
   /**
    * Returns the current maximum of the parameter range of the currently active color bar.
    */
-  float getMaxValue (void) const;
+  float getMaxValue () const;
   /**
    * Customizes the currently active color bar.
    */

src/Gui/SoFCColorGradient.cpp

@@ -72,7 +72,7 @@ SoFCColorGradient::~SoFCColorGradient()
 }
 
 // doc from parent
-void SoFCColorGradient::initClass(void)
+void SoFCColorGradient::initClass()
 {
     SO_NODE_INIT_CLASS(SoFCColorGradient,SoFCColorBarBase,"Separator");
 }

src/Gui/SoFCColorGradient.h

@@ -42,9 +42,9 @@ class GuiExport SoFCColorGradient : public SoFCColorBarBase {
   SO_NODE_HEADER(Gui::SoFCColorGradient);
 
 public:
-  static void initClass(void);
-  static void finish(void);
-  SoFCColorGradient(void);
+  static void initClass();
+  static void finish();
+  SoFCColorGradient();
 
   /**
    * Sets the range of the colorbar from the maximum \a fMax to the minimum \a fMin.
@@ -63,9 +63,9 @@ public:
    */
   bool isVisible (float fVal) const;
   /** Returns the current minimum of the parameter range. */
-  float getMinValue (void) const { return _cColGrad.getMinValue(); }
+  float getMinValue () const { return _cColGrad.getMinValue(); }
   /** Returns the current maximum of the parameter range. */
-  float getMaxValue (void) const { return _cColGrad.getMaxValue(); }
+  float getMaxValue () const { return _cColGrad.getMaxValue(); }
   /**
    * Opens a dialog to customize the current settings of the color gradient bar.
    * Returns true if the settings have been changed, false otherwise.

src/Gui/SoFCColorLegend.cpp

@@ -73,7 +73,7 @@ SoFCColorLegend::~SoFCColorLegend()
 }
 
 // doc from parent
-void SoFCColorLegend::initClass(void)
+void SoFCColorLegend::initClass()
 {
     SO_NODE_INIT_CLASS(SoFCColorLegend,SoFCColorBarBase,"Separator");
 }

src/Gui/SoFCColorLegend.h

@@ -41,9 +41,9 @@ class GuiExport SoFCColorLegend : public SoFCColorBarBase {
   SO_NODE_HEADER(Gui::SoFCColorLegend);
 
 public:
-  static void initClass(void);
-  static void finish(void);
-  SoFCColorLegend(void);
+  static void initClass();
+  static void finish();
+  SoFCColorLegend();
 
   void setLegendLabels(const App::ColorLegend& legend, int prec=3);
 
@@ -61,9 +61,9 @@ public:
   App::Color getColor (float fVal) const { return _currentLegend.getColor(fVal); }
   void setOutsideGrayed (bool bVal) { _currentLegend.setOutsideGrayed(bVal); }
   bool isVisible (float) const { return false; }
-  float getMinValue (void) const { return _currentLegend.getMinValue(); }
-  float getMaxValue (void) const { return _currentLegend.getMaxValue(); }
-  std::size_t countColors (void) const { return _currentLegend.hasNumberOfFields(); }
+  float getMinValue () const { return _currentLegend.getMinValue(); }
+  float getMaxValue () const { return _currentLegend.getMaxValue(); }
+  std::size_t countColors () const { return _currentLegend.hasNumberOfFields(); }
 
   bool customize() { return false; }
   const char* getColorBarName() const { return "Color Legend"; }