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// Copyright (C) 2016 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
#include "qdnd_p.h"
#include "qguiapplication.h"
#include <ctype.h>
#include <qpa/qplatformdrag.h>
#include <qpa/qplatformintegration.h>
#include <private/qguiapplication_p.h>
QT_BEGIN_NAMESPACE
// the universe's only drag manager
QDragManager *QDragManager::m_instance = nullptr;
QDragManager::QDragManager()
: QObject(qApp), m_currentDropTarget(nullptr),
m_platformDrag(QGuiApplicationPrivate::platformIntegration()->drag()),
m_object(nullptr)
{
Q_ASSERT(!m_instance);
}
QDragManager::~QDragManager()
{
m_instance = nullptr;
}
QDragManager *QDragManager::self()
{
if (!m_instance && !QGuiApplication::closingDown())
m_instance = new QDragManager;
return m_instance;
}
QObject *QDragManager::source() const
{
if (m_object)
return m_object->source();
return nullptr;
}
void QDragManager::setCurrentTarget(QObject *target, bool dropped)
{
if (m_currentDropTarget == target)
return;
m_currentDropTarget = target;
if (!dropped && m_object) {
m_object->d_func()->target = target;
emit m_object->targetChanged(target);
}
}
QObject *QDragManager::currentTarget() const
{
return m_currentDropTarget;
}
Qt::DropAction QDragManager::drag(QDrag *o)
{
if (!o || m_object == o)
return Qt::IgnoreAction;
if (!m_platformDrag || !o->source()) {
o->deleteLater();
return Qt::IgnoreAction;
}
if (m_object) {
qWarning("QDragManager::drag in possibly invalid state");
return Qt::IgnoreAction;
}
m_object = o;
m_object->d_func()->target = nullptr;
QGuiApplicationPrivate::instance()->notifyDragStarted(m_object.data());
const Qt::DropAction result = m_platformDrag->drag(m_object);
if (!m_object.isNull() && !m_platformDrag->ownsDragObject())
m_object->deleteLater();
m_object.clear();
return result;
}
QT_END_NAMESPACE
#include "moc_qdnd_p.cpp"
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