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+/****************************************************************************
+**
+** Copyright (C) 2018 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 QQUICKDRAGHANDLER_H
+#define QQUICKDRAGHANDLER_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 "qquickmultipointhandler_p.h"
+#include "qquickdragaxis_p.h"
+
+QT_BEGIN_NAMESPACE
+
+class Q_AUTOTEST_EXPORT QQuickDragHandler : public QQuickMultiPointHandler
+{
+ Q_OBJECT
+ Q_PROPERTY(QQuickDragAxis * xAxis READ xAxis CONSTANT)
+ Q_PROPERTY(QQuickDragAxis * yAxis READ yAxis CONSTANT)
+ Q_PROPERTY(QVector2D translation READ translation NOTIFY translationChanged)
+
+public:
+ explicit QQuickDragHandler(QQuickItem *parent = nullptr);
+
+ void handlePointerEventImpl(QQuickPointerEvent *event) override;
+
+ QQuickDragAxis *xAxis() { return &m_xAxis; }
+ QQuickDragAxis *yAxis() { return &m_yAxis; }
+
+ QVector2D translation() const { return m_translation; }
+ void setTranslation(const QVector2D &trans);
+
+ void enforceConstraints();
+
+Q_SIGNALS:
+ void translationChanged();
+
+protected:
+ void onActiveChanged() override;
+ void onGrabChanged(QQuickPointerHandler *grabber, QQuickEventPoint::GrabTransition transition, QQuickEventPoint *point) override;
+
+private:
+ void ungrab();
+ void enforceAxisConstraints(QPointF *localPos);
+ bool targetContainsCentroid();
+ QPointF targetCentroidPosition();
+
+private:
+ QPointF m_pressTargetPos; // We must also store the local targetPos, because we cannot deduce
+ // the press target pos from the scene pos in case there was e.g a
+ // flick in one of the ancestors during the drag.
+ QVector2D m_translation;
+
+ QQuickDragAxis m_xAxis;
+ QQuickDragAxis m_yAxis;
+ bool m_pressedInsideTarget = false;
+
+ friend class QQuickDragAxis;
+};
+
+QT_END_NAMESPACE
+
+QML_DECLARE_TYPE(QQuickDragHandler)
+QML_DECLARE_TYPE(QQuickDragAxis)
+
+#endif // QQUICKDRAGHANDLER_H