| 1 | // Copyright (C) 2016 The Qt Company Ltd. |
|---|---|
| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
| 3 | |
| 4 | #include "qdnd_p.h" |
| 5 | |
| 6 | #include "qguiapplication.h" |
| 7 | #include <ctype.h> |
| 8 | #include <qpa/qplatformdrag.h> |
| 9 | #include <qpa/qplatformintegration.h> |
| 10 | #include <private/qguiapplication_p.h> |
| 11 | |
| 12 | QT_BEGIN_NAMESPACE |
| 13 | |
| 14 | // the universe's only drag manager |
| 15 | QDragManager *QDragManager::m_instance = nullptr; |
| 16 | |
| 17 | QDragManager::QDragManager() |
| 18 | : QObject(qApp), m_currentDropTarget(nullptr), |
| 19 | m_platformDrag(QGuiApplicationPrivate::platformIntegration()->drag()), |
| 20 | m_object(nullptr) |
| 21 | { |
| 22 | Q_ASSERT(!m_instance); |
| 23 | } |
| 24 | |
| 25 | QDragManager::~QDragManager() |
| 26 | { |
| 27 | m_instance = nullptr; |
| 28 | } |
| 29 | |
| 30 | QDragManager *QDragManager::self() |
| 31 | { |
| 32 | if (!m_instance && !QGuiApplication::closingDown()) |
| 33 | m_instance = new QDragManager; |
| 34 | return m_instance; |
| 35 | } |
| 36 | |
| 37 | QObject *QDragManager::source() const |
| 38 | { |
| 39 | if (m_object) |
| 40 | return m_object->source(); |
| 41 | return nullptr; |
| 42 | } |
| 43 | |
| 44 | void QDragManager::setCurrentTarget(QObject *target, bool dropped) |
| 45 | { |
| 46 | if (m_currentDropTarget == target) |
| 47 | return; |
| 48 | |
| 49 | m_currentDropTarget = target; |
| 50 | if (!dropped && m_object) { |
| 51 | m_object->d_func()->target = target; |
| 52 | emit m_object->targetChanged(newTarget: target); |
| 53 | } |
| 54 | } |
| 55 | |
| 56 | QObject *QDragManager::currentTarget() const |
| 57 | { |
| 58 | return m_currentDropTarget; |
| 59 | } |
| 60 | |
| 61 | Qt::DropAction QDragManager::drag(QDrag *o) |
| 62 | { |
| 63 | if (!o || m_object == o) |
| 64 | return Qt::IgnoreAction; |
| 65 | |
| 66 | if (!m_platformDrag || !o->source()) { |
| 67 | o->deleteLater(); |
| 68 | return Qt::IgnoreAction; |
| 69 | } |
| 70 | |
| 71 | if (m_object) { |
| 72 | qWarning(msg: "QDragManager::drag in possibly invalid state"); |
| 73 | return Qt::IgnoreAction; |
| 74 | } |
| 75 | |
| 76 | m_object = o; |
| 77 | |
| 78 | m_object->d_func()->target = nullptr; |
| 79 | |
| 80 | QGuiApplicationPrivate::instance()->notifyDragStarted(m_object.data()); |
| 81 | const Qt::DropAction result = m_platformDrag->drag(m_drag: m_object); |
| 82 | if (!m_object.isNull() && !m_platformDrag->ownsDragObject()) |
| 83 | m_object->deleteLater(); |
| 84 | |
| 85 | m_object.clear(); |
| 86 | return result; |
| 87 | } |
| 88 | |
| 89 | QT_END_NAMESPACE |
| 90 | |
| 91 | #include "moc_qdnd_p.cpp" |
| 92 |