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| ****************************************************************************/ |
| #ifndef QXCBEVENTQUEUE_H |
| #define QXCBEVENTQUEUE_H |
| |
| #include <QtCore/QThread> |
| #include <QtCore/QHash> |
| #include <QtCore/QEventLoop> |
| #include <QtCore/QVector> |
| #include <QtCore/QMutex> |
| #include <QtCore/QWaitCondition> |
| |
| #include <xcb/xcb.h> |
| |
| #include <atomic> |
| |
| QT_BEGIN_NAMESPACE |
| |
| struct QXcbEventNode { |
| QXcbEventNode(xcb_generic_event_t *e = nullptr) |
| : event(e) { } |
| |
| xcb_generic_event_t *event; |
| QXcbEventNode *next = nullptr; |
| bool fromHeap = false; |
| }; |
| |
| class QXcbConnection; |
| class QAbstractEventDispatcher; |
| |
| class QXcbEventQueue : public QThread |
| { |
| Q_OBJECT |
| public: |
| QXcbEventQueue(QXcbConnection *connection); |
| ~QXcbEventQueue(); |
| |
| enum { PoolSize = 100 }; // 2.4 kB with 100 nodes |
| |
| enum PeekOption { |
| PeekDefault = 0, // see qx11info_x11.h for docs |
| PeekFromCachedIndex = 1, |
| PeekRetainMatch = 2, |
| PeekRemoveMatch = 3, |
| PeekRemoveMatchContinue = 4 |
| }; |
| Q_DECLARE_FLAGS(PeekOptions, PeekOption) |
| |
| void run() override; |
| |
| bool isEmpty() const { return m_head == m_flushedTail && !m_head->event; } |
| xcb_generic_event_t *takeFirst(QEventLoop::ProcessEventsFlags flags); |
| xcb_generic_event_t *takeFirst(); |
| void flushBufferedEvents(); |
| void wakeUpDispatcher(); |
| |
| // ### peek() and peekEventQueue() could be unified. Note that peekEventQueue() |
| // is public API exposed via QX11Extras/QX11Info. |
| template<typename Peeker> |
| xcb_generic_event_t *peek(Peeker &&peeker) { |
| return peek(PeekRemoveMatch, std::forward<Peeker>(peeker)); |
| } |
| template<typename Peeker> |
| inline xcb_generic_event_t *peek(PeekOption config, Peeker &&peeker); |
| |
| qint32 generatePeekerId(); |
| bool removePeekerId(qint32 peekerId); |
| |
| using PeekerCallback = bool (*)(xcb_generic_event_t *event, void *peekerData); |
| bool peekEventQueue(PeekerCallback peeker, void *peekerData = nullptr, |
| PeekOptions option = PeekDefault, qint32 peekerId = -1); |
| |
| void waitForNewEvents(unsigned long time = ULONG_MAX); |
| |
| private: |
| QXcbEventNode *qXcbEventNodeFactory(xcb_generic_event_t *event); |
| void dequeueNode(); |
| |
| void sendCloseConnectionEvent() const; |
| bool isCloseConnectionEvent(const xcb_generic_event_t *event); |
| |
| QXcbEventNode *m_head = nullptr; |
| QXcbEventNode *m_flushedTail = nullptr; |
| std::atomic<QXcbEventNode *> m_tail { nullptr }; |
| std::atomic_uint m_nodesRestored { 0 }; |
| |
| QXcbConnection *m_connection = nullptr; |
| bool m_closeConnectionDetected = false; |
| |
| uint m_freeNodes = PoolSize; |
| uint m_poolIndex = 0; |
| |
| qint32 m_peekerIdSource = 0; |
| bool m_queueModified = false; |
| bool m_peekerIndexCacheDirty = false; |
| QHash<qint32, QXcbEventNode *> m_peekerToNode; |
| |
| QVector<xcb_generic_event_t *> m_inputEvents; |
| |
| // debug stats |
| quint64 m_nodesOnHeap = 0; |
| |
| QMutex m_newEventsMutex; |
| QWaitCondition m_newEventsCondition; |
| }; |
| |
| template<typename Peeker> |
| xcb_generic_event_t *QXcbEventQueue::peek(PeekOption option, Peeker &&peeker) |
| { |
| flushBufferedEvents(); |
| if (isEmpty()) |
| return nullptr; |
| |
| QXcbEventNode *node = m_head; |
| do { |
| xcb_generic_event_t *event = node->event; |
| if (event && peeker(event, event->response_type & ~0x80)) { |
| if (option == PeekRemoveMatch || option == PeekRemoveMatchContinue) |
| node->event = nullptr; |
| if (option != PeekRemoveMatchContinue) |
| return event; |
| } |
| if (node == m_flushedTail) |
| break; |
| node = node->next; |
| } while (true); |
| |
| return nullptr; |
| } |
| |
| QT_END_NAMESPACE |
| |
| #endif |