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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 QQUICKPOINTERHANDLER_H
#define QQUICKPOINTERHANDLER_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 "qevent.h"
#include <QtQuick/private/qquickevents_p_p.h>
#include <QtQuick/private/qquickitem_p.h>
QT_BEGIN_NAMESPACE
Q_DECLARE_LOGGING_CATEGORY(lcPointerHandlerDispatch)
class Q_QUICK_PRIVATE_EXPORT QQuickPointerHandler : public QObject, public QQmlParserStatus
{
Q_OBJECT
Q_INTERFACES(QQmlParserStatus)
Q_PROPERTY(bool enabled READ enabled WRITE setEnabled NOTIFY enabledChanged)
Q_PROPERTY(bool active READ active NOTIFY activeChanged)
Q_PROPERTY(QQuickItem * target READ target WRITE setTarget NOTIFY targetChanged)
Q_PROPERTY(QQuickItem * parent READ parentItem CONSTANT)
Q_PROPERTY(GrabPermissions grabPermissions READ grabPermissions WRITE setGrabPermissions NOTIFY grabPermissionChanged)
public:
explicit QQuickPointerHandler(QObject *parent = nullptr);
virtual ~QQuickPointerHandler();
enum GrabPermission {
TakeOverForbidden = 0x0,
CanTakeOverFromHandlersOfSameType = 0x01,
CanTakeOverFromHandlersOfDifferentType= 0x02,
CanTakeOverFromItems = 0x04,
CanTakeOverFromAnything = 0x0F,
ApprovesTakeOverByHandlersOfSameType = 0x10,
ApprovesTakeOverByHandlersOfDifferentType= 0x20,
ApprovesTakeOverByItems = 0x40,
ApprovesCancellation = 0x80,
ApprovesTakeOverByAnything = 0xF0
};
Q_DECLARE_FLAGS(GrabPermissions, GrabPermission)
Q_FLAG(GrabPermissions)
public:
bool enabled() const { return m_enabled; }
void setEnabled(bool enabled);
bool active() const { return m_active; }
QQuickItem *target() const;
void setTarget(QQuickItem *target);
QQuickItem * parentItem() const { return static_cast<QQuickItem *>(QObject::parent()); }
void handlePointerEvent(QQuickPointerEvent *event);
GrabPermissions grabPermissions() const { return static_cast<GrabPermissions>(m_grabPermissions); }
void setGrabPermissions(GrabPermissions grabPermissions);
Q_SIGNALS:
void enabledChanged();
void activeChanged();
void targetChanged();
void grabChanged(QQuickEventPoint *point);
void grabPermissionChanged();
void canceled(QQuickEventPoint *point);
protected:
void classBegin() override;
void componentComplete() override;
QQuickPointerEvent *currentEvent() { return m_currentEvent; }
virtual bool wantsPointerEvent(QQuickPointerEvent *event);
virtual void handlePointerEventImpl(QQuickPointerEvent *event);
void setActive(bool active);
virtual void onTargetChanged(QQuickItem *oldTarget) { Q_UNUSED(oldTarget); }
virtual void onActiveChanged() { }
virtual void onGrabChanged(QQuickPointerHandler *grabber, QQuickEventPoint::GrabState stateChange, QQuickEventPoint *point);
virtual bool canGrab(QQuickEventPoint *point);
virtual bool approveGrabTransition(QQuickEventPoint *point, QObject *proposedGrabber);
void setPassiveGrab(QQuickEventPoint *point, bool grab = true);
bool setExclusiveGrab(QQuickEventPoint *point, bool grab = true);
void cancelAllGrabs(QQuickEventPoint *point);
QPointF eventPos(const QQuickEventPoint *point) const;
bool parentContains(const QQuickEventPoint *point) const;
private:
QQuickPointerEvent *m_currentEvent;
QQuickItem *m_target;
bool m_enabled : 1;
bool m_active : 1;
bool m_targetExplicitlySet : 1;
bool m_hadKeepMouseGrab : 1; // some handlers override target()->setKeepMouseGrab(); this remembers previous state
bool m_hadKeepTouchGrab : 1; // some handlers override target()->setKeepTouchGrab(); this remembers previous state
uint m_reserved : 19;
uint8_t m_grabPermissions : 8;
friend class QQuickEventPoint;
friend class QQuickWindowPrivate;
};
Q_DECLARE_OPERATORS_FOR_FLAGS(QQuickPointerHandler::GrabPermissions)
QT_END_NAMESPACE
QML_DECLARE_TYPE(QQuickPointerHandler)
#endif // QQUICKPOINTERHANDLER_H
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