Gui: move handling of SoMouseWheelEvent to its own handler function

src/Gui/GestureNavigationStyle.cpp

@@ -72,6 +72,7 @@
 #include "GestureNavigationStyle.h"
 
 #include <App/Application.h>
+#include <Base/Interpreter.h>
 #include <Base/Console.h>
 #include "View3DInventorViewer.h"
 #include "Application.h"

src/Gui/NavigationStyle.cpp

@@ -1495,24 +1495,19 @@ SbBool NavigationStyle::processEvent(const SoEvent * const ev)
 
 SbBool NavigationStyle::processSoEvent(const SoEvent * const ev)
 {
-    const SbVec2s pos(ev->getPosition());
-    const SbVec2f posn = normalizePixelPos(pos);
     bool processed = false;
 
     //handle mouse wheel zoom
-    if(ev->isOfType(SoMouseWheelEvent::getClassTypeId())){
-        doZoom(
-            viewer->getSoRenderManager()->getCamera(),
-            static_cast<const SoMouseWheelEvent*>(ev)->getDelta(),
-            posn
-        );
-        processed = true;
+    if (ev->isOfType(SoMouseWheelEvent::getClassTypeId())) {
+        const SoMouseWheelEvent * const event = static_cast<const SoMouseWheelEvent *>(ev);
+        processed = processWheelEvent(event);
     }
 
-    if (! processed)
-        return viewer->processSoEventBase(ev);
-    else
-        return processed;
+    if (!processed) {
+        processed = viewer->processSoEventBase(ev);
+    }
+
+    return processed;
 }
 
 void NavigationStyle::syncWithEvent(const SoEvent * const ev)
@@ -1692,6 +1687,17 @@ SbBool NavigationStyle::processClickEvent(const SoMouseButtonEvent * const event
     return processed;
 }
 
+SbBool NavigationStyle::processWheelEvent(const SoMouseWheelEvent * const event)
+{
+    const SbVec2s pos(event->getPosition());
+    const SbVec2f posn = normalizePixelPos(pos);
+
+    //handle mouse wheel zoom
+    doZoom(viewer->getSoRenderManager()->getCamera(),
+           event->getDelta(), posn);
+    return true;
+}
+
 void NavigationStyle::setPopupMenuEnabled(const SbBool on)
 {
     this->menuenabled = on;

src/Gui/NavigationStyle.h

@@ -41,6 +41,7 @@
 
 // forward declarations
 class SoEvent;
+class SoMouseWheelEvent;
 class SoMotion3Event;
 class SoQtViewer;
 class SoCamera;
@@ -154,6 +155,7 @@ public:
     virtual SbBool processMotionEvent(const SoMotion3Event * const ev);
     virtual SbBool processKeyboardEvent(const SoKeyboardEvent * const event);
     virtual SbBool processClickEvent(const SoMouseButtonEvent * const event);
+    virtual SbBool processWheelEvent(const SoMouseWheelEvent * const event);
 
     void setPopupMenuEnabled(const SbBool on);
     SbBool isPopupMenuEnabled() const;