text: /****************************************************************************
  **
  ** Copyright (C) 2019 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the QtQuick module of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:LGPL$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
  ** and conditions see https://www.qt.io/terms-conditions. For further
  ** information use the contact form at https://www.qt.io/contact-us.
  **
  ** GNU Lesser General Public License Usage
  ** Alternatively, this file may be used under the terms of the GNU Lesser
  ** General Public License version 3 as published by the Free Software
  ** Foundation and appearing in the file LICENSE.LGPL3 included in the
  ** packaging of this file. Please review the following information to
  ** ensure the GNU Lesser General Public License version 3 requirements
  ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
  **
  ** GNU General Public License Usage
  ** Alternatively, this file may be used under the terms of the GNU
  ** General Public License version 2.0 or (at your option) the GNU General
  ** Public license version 3 or any later version approved by the KDE Free
  ** Qt Foundation. The licenses are as published by the Free Software
  ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
  ** included in the packaging of this file. Please review the following
  ** information to ensure the GNU General Public License requirements will
  ** be met: https://www.gnu.org/licenses/gpl-2.0.html and
  ** https://www.gnu.org/licenses/gpl-3.0.html.
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/
  
  #ifndef QQUICKWHEELHANDLER_H
  #define QQUICKWHEELHANDLER_H
  
  //
  //  W A R N I N G
  //  -------------
  //
  // This file is not part of the Qt API.  It exists purely as an
  // implementation detail.  This header file may change from version to
  // version without notice, or even be removed.
  //
  // We mean it.
  //
  
  #include "qquickitem.h"
  #include "qevent.h"
  #include "qquicksinglepointhandler_p.h"
  
  QT_BEGIN_NAMESPACE
  
  class QQuickWheelEvent;
  class QQuickWheelHandlerPrivate;
  
  class Q_QUICK_PRIVATE_EXPORT QQuickWheelHandler : public QQuickSinglePointHandler
  {
      Q_OBJECT
      Q_PROPERTY(Qt::Orientation orientation READ orientation WRITE setOrientation NOTIFY orientationChanged)
      Q_PROPERTY(bool invertible READ isInvertible WRITE setInvertible NOTIFY invertibleChanged)
      Q_PROPERTY(qreal activeTimeout READ activeTimeout WRITE setActiveTimeout NOTIFY activeTimeoutChanged)
      Q_PROPERTY(qreal rotation READ rotation WRITE setRotation NOTIFY rotationChanged)
      Q_PROPERTY(qreal rotationScale READ rotationScale WRITE setRotationScale NOTIFY rotationScaleChanged)
      Q_PROPERTY(QString property READ property WRITE setProperty NOTIFY propertyChanged)
      Q_PROPERTY(qreal targetScaleMultiplier READ targetScaleMultiplier WRITE setTargetScaleMultiplier NOTIFY targetScaleMultiplierChanged)
      Q_PROPERTY(bool targetTransformAroundCursor READ isTargetTransformAroundCursor WRITE setTargetTransformAroundCursor NOTIFY targetTransformAroundCursorChanged)
  
  public:
      explicit QQuickWheelHandler(QQuickItem *parent = nullptr);
  
      Qt::Orientation orientation() const;
      void setOrientation(Qt::Orientation orientation);
  
      bool isInvertible() const;
      void setInvertible(bool invertible);
  
      qreal activeTimeout() const;
      void setActiveTimeout(qreal timeout);
  
      qreal rotation() const;
      void setRotation(qreal rotation);
  
      qreal rotationScale() const;
      void setRotationScale(qreal rotationScale);
  
      QString property() const;
      void setProperty(const QString &name);
  
      qreal targetScaleMultiplier() const;
      void setTargetScaleMultiplier(qreal targetScaleMultiplier);
  
      bool isTargetTransformAroundCursor() const;
      void setTargetTransformAroundCursor(bool ttac);
  
  Q_SIGNALS:
      void wheel(QQuickPointerScrollEvent *event);
  
      void orientationChanged();
      void invertibleChanged();
      void activeTimeoutChanged();
      void rotationChanged();
      void rotationScaleChanged();
      void propertyChanged();
      void targetScaleMultiplierChanged();
      void targetTransformAroundCursorChanged();
  
  protected:
      bool wantsPointerEvent(QQuickPointerEvent *event) override;
      void handleEventPoint(QQuickEventPoint *point) override;
      void onTargetChanged(QQuickItem *oldTarget) override;
      void onActiveChanged() override;
      void timerEvent(QTimerEvent *event) override;
  
      Q_DECLARE_PRIVATE(QQuickWheelHandler)
  };
  
  QT_END_NAMESPACE
  
  QML_DECLARE_TYPE(QQuickWheelHandler)
  
  #endif // QQUICKWHEELHANDLER_H
  