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+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt 3D Studio.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** 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 General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** 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-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#ifndef MOUSEHELPER_H
+#define MOUSEHELPER_H
+
+#include <QtCore/qobject.h>
+#include <QtCore/qpoint.h>
+#include <QtCore/qtimer.h>
+
+QT_FORWARD_DECLARE_CLASS(QWidget)
+QT_FORWARD_DECLARE_CLASS(QWindow)
+
+class MouseHelper : public QObject
+{
+ Q_OBJECT
+
+public:
+ explicit MouseHelper(QObject *parent = nullptr);
+ ~MouseHelper() {};
+
+ Q_INVOKABLE void startUnboundedDrag();
+ Q_INVOKABLE void endUnboundedDrag();
+ Q_INVOKABLE QPoint delta();
+
+ void setWidget(QWidget *widget);
+
+private Q_SLOTS:
+ void resetCursor();
+
+protected:
+ bool eventFilter(QObject *obj, QEvent *event) override;
+
+private:
+ QPoint m_startPos;
+ QPoint m_referencePoint;
+ QPoint m_previousPoint;
+ QTimer m_cursorResetTimer;
+
+ enum DragState {
+ StateNotDragging,
+ StateDragging,
+ StateEndingDrag,
+ StateFinalCursorReset
+ };
+ DragState m_dragState;
+ QWidget *m_widget = nullptr; // Not owned
+ QWindow *m_window = nullptr; // Not owned
+ QPoint m_maxDelta;
+};
+
+#endif // MOUSEHELPER_H