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// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QEVENT_P_H
#define QEVENT_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of other Qt classes. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtGui/private/qtguiglobal_p.h>
#include <QtCore/qurl.h>
#include <QtGui/qevent.h>
#include <QtGui/qwindow.h>
QT_BEGIN_NAMESPACE
class QPointingDevice;
/*!
\internal
\since 6.9
This class provides a way to store copies of QEvents. QEvents can otherwise
only be copied by \l{QEvent::clone()}{cloning}, which allocates the copy on
the heap. By befriending concrete QEvent subclasses, QEventStorage gains
access to their protected copy constructors.
It is similar to std::optional, but with a more targeted API.
Note that by storing an event in QEventStorage, it may be sliced.
*/
template <typename Event>
class QEventStorage
{
Q_DISABLE_COPY_MOVE(QEventStorage)
static_assert(std::is_base_of_v<QEvent, Event>);
union {
char m_eventNotSet; // could be std::monostate, but don't want to pay for <variant> include
Event m_event;
};
bool m_engaged = false;
void engage(const Event &e)
{
Q_ASSERT(!m_engaged);
new (&m_event) Event(e);
m_engaged = true;
}
void disengage()
{
Q_ASSERT(m_engaged);
m_event.~Event();
m_engaged = false;
}
public:
QEventStorage() noexcept : m_eventNotSet{} {}
explicit QEventStorage(const Event &e)
{
engage(e);
}
~QEventStorage()
{
if (m_engaged)
disengage();
}
explicit operator bool() const noexcept { return m_engaged; }
bool operator!() const noexcept { return !m_engaged; }
Event &store(const Event &e)
{
if (m_engaged)
disengage();
engage(e);
return m_event;
}
Event &storeUnlessAlias(const Event &e)
{
if (m_engaged && &e == &m_event)
return m_event;
return store(e);
}
const Event &operator*() const
{
Q_PRE(m_engaged);
return m_event;
}
Event &operator*()
{
Q_PRE(m_engaged);
return m_event;
}
const Event *operator->() const
{
Q_PRE(m_engaged);
return &m_event;
}
Event *operator->()
{
Q_PRE(m_engaged);
return &m_event;
}
};
class Q_GUI_EXPORT QMutableTouchEvent : public QTouchEvent
{
public:
QMutableTouchEvent(QEvent::Type eventType = QEvent::TouchBegin,
const QPointingDevice *device = nullptr,
Qt::KeyboardModifiers modifiers = Qt::NoModifier,
const QList<QEventPoint> &touchPoints = QList<QEventPoint>()) :
QTouchEvent(eventType, device, modifiers, touchPoints) { }
~QMutableTouchEvent() override;
void setTarget(QObject *target) { m_target = target; }
void addPoint(const QEventPoint &point);
static void setTarget(QTouchEvent *e, QObject *target) { e->m_target = target; }
static void addPoint(QTouchEvent *e, const QEventPoint &point);
};
class Q_GUI_EXPORT QMutableSinglePointEvent : public QSinglePointEvent
{
public:
QMutableSinglePointEvent(const QSinglePointEvent &other) : QSinglePointEvent(other) {}
QMutableSinglePointEvent(Type type = QEvent::None, const QPointingDevice *device = nullptr, const QEventPoint &point = QEventPoint(),
Qt::MouseButton button = Qt::NoButton, Qt::MouseButtons buttons = Qt::NoButton,
Qt::KeyboardModifiers modifiers = Qt::NoModifier,
Qt::MouseEventSource source = Qt::MouseEventSynthesizedByQt) :
QSinglePointEvent(type, device, point, button, buttons, modifiers, source) { }
~QMutableSinglePointEvent() override;
void setSource(Qt::MouseEventSource s) { m_source = s; }
bool isDoubleClick() { return m_doubleClick; }
void setDoubleClick(bool d = true) { m_doubleClick = d; }
static bool isDoubleClick(const QSinglePointEvent *ev)
{
return ev->m_doubleClick;
}
static void setDoubleClick(QSinglePointEvent *ev, bool d)
{
ev->m_doubleClick = d;
}
};
QT_END_NAMESPACE
#endif // QEVENT_P_H
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