Axis Range Dragging With Labels Example

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 #ifndef AXESINPUTHANDLER_H
 #define AXESINPUTHANDLER_H

 #include <QtDataVisualization/Q3DInputHandler>
 #include <QtDataVisualization/QAbstract3DGraph>
 #include <QtDataVisualization/QValue3DAxis>

 using namespace QtDataVisualization;

 class AxesInputHandler : public Q3DInputHandler
 {
     Q_OBJECT

     enum InputState {
         StateNormal = 0,
         StateDraggingX,
         StateDraggingZ,
         StateDraggingY
     };

 public:
     explicit AxesInputHandler(QAbstract3DGraph *graph, QObject *parent = 0);

     inline void setAxes(QValue3DAxis *axisX, QValue3DAxis *axisZ, QValue3DAxis *axisY) {
         m_axisX = axisX;
         m_axisZ = axisZ;
         m_axisY = axisY;
     }

     inline void setDragSpeedModifier(float modifier) { m_speedModifier = modifier; }

     virtual void mousePressEvent(QMouseEvent *event, const QPoint &mousePos);
     virtual void mouseMoveEvent(QMouseEvent *event, const QPoint &mousePos);
     virtual void mouseReleaseEvent(QMouseEvent *event, const QPoint &mousePos);

 private:
     void handleElementSelected(QAbstract3DGraph::ElementType type);
     void handleAxisDragging();

 private:
     bool m_mousePressed;
     InputState m_state;
     QValue3DAxis *m_axisX;
     QValue3DAxis *m_axisZ;
     QValue3DAxis *m_axisY;
     float m_speedModifier;
 };

 #endif