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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_QUICK_PRIVATE_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)
Q_PROPERTY(QVector2D activeTranslation READ activeTranslation NOTIFY translationChanged REVISION(6, 2))
Q_PROPERTY(QVector2D persistentTranslation READ persistentTranslation WRITE setPersistentTranslation NOTIFY translationChanged REVISION(6, 2))
Q_PROPERTY(SnapMode snapMode READ snapMode WRITE setSnapMode NOTIFY snapModeChanged REVISION(2, 14))
QML_NAMED_ELEMENT(DragHandler)
QML_ADDED_IN_VERSION(2, 12)
public:
enum SnapMode {
NoSnap = 0,
SnapAuto,
SnapIfPressedOutsideTarget,
SnapAlways
};
Q_ENUM(SnapMode)
explicit QQuickDragHandler(QQuickItem *parent = nullptr);
void handlePointerEventImpl(QPointerEvent *event) override;
QQuickDragAxis *xAxis() { return &m_xAxis; }
QQuickDragAxis *yAxis() { return &m_yAxis; }
QVector2D translation() const { return m_activeTranslation; }
QVector2D activeTranslation() const { return m_activeTranslation; }
void setActiveTranslation(const QVector2D &trans);
QVector2D persistentTranslation() const { return m_persistentTranslation; }
void setPersistentTranslation(const QVector2D &trans);
QQuickDragHandler::SnapMode snapMode() const;
void setSnapMode(QQuickDragHandler::SnapMode mode);
void enforceConstraints();
Q_SIGNALS:
void translationChanged();
Q_REVISION(2, 14) void snapModeChanged();
protected:
bool wantsPointerEvent(QPointerEvent *event) override;
void onActiveChanged() override;
void onGrabChanged(QQuickPointerHandler *grabber, QPointingDevice::GrabTransition transition, QPointerEvent *event, QEventPoint &point) override;
private:
void ungrab();
void enforceAxisConstraints(QPointF *localPos);
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_activeTranslation;
QVector2D m_persistentTranslation;
QVector2D m_startTranslation;
QQuickDragAxis m_xAxis;
QQuickDragAxis m_yAxis;
QQuickDragHandler::SnapMode m_snapMode = SnapAuto;
bool m_pressedInsideTarget = false;
friend class QQuickDragAxis;
};
QT_END_NAMESPACE
QML_DECLARE_TYPE(QQuickDragHandler)
QML_DECLARE_TYPE(QQuickDragAxis)
#endif // QQUICKDRAGHANDLER_H
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