126 lines
3.7 KiB
C++
126 lines
3.7 KiB
C++
/****************************************************************************
|
|
**
|
|
** Copyright (C) 2016 The Qt Company Ltd.
|
|
** Contact: https://www.qt.io/licensing/
|
|
**
|
|
** This file is part of the QtGui 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.
|
|
**
|
|
** $QT_END_LICENSE$
|
|
**
|
|
****************************************************************************/
|
|
|
|
#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
|