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| ****************************************************************************/ |
| |
| #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 |