Qt 5.8 | Qt Data Visualization | Custom Input Example | custominputhandler.cpp Example File

Qt 5.8.0 Reference Documentation

# custominputhandler.cpp Example File

custominput/custominputhandler.cpp

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      ** Contact: https://www.qt.io/licensing/
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      ** This file is part of the Qt Data Visualization module of the Qt Toolkit.
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      #include "custominputhandler.h"

      #include <QtDataVisualization/Q3DCamera>

      CustomInputHandler::CustomInputHandler(QObject *parent) :
          QAbstract3DInputHandler(parent)
      {
      }

      void CustomInputHandler::mouseMoveEvent(QMouseEvent *event, const QPoint &mousePos)
      {
          Q_UNUSED(event)
          setInputPosition(mousePos);
      }

      void CustomInputHandler::wheelEvent(QWheelEvent *event)
      {
          // Adjust zoom level based on what zoom range we're in.
          int zoomLevel = scene()->activeCamera()->zoomLevel();
          if (zoomLevel > 100)
              zoomLevel += event->angleDelta().y() / 12;
          else if (zoomLevel > 50)
              zoomLevel += event->angleDelta().y() / 60;
          else
              zoomLevel += event->angleDelta().y() / 120;
          if (zoomLevel > 500)
              zoomLevel = 500;
          else if (zoomLevel < 10)
              zoomLevel = 10;

          scene()->activeCamera()->setZoomLevel(zoomLevel);
      }