QCoreapplication sendEvent源码-QT开发中文网

在Qt的源码中，QCoreApplication::sendEvent()函数用于将事件发送到指定的对象。以下是QCoreApplication::sendEvent()函数的简化示例代码：

”`cpp bool QCoreApplication::sendEvent(QObject *receiver, QEvent *event) {

Q_ASSERT(receiver);
Q_ASSERT(event);

QThreadData *threadData = receiver->threadData;
if (!threadData) {
    qWarning("Cannot send events to objects owned by a different thread.");
    return false;
}

// 在接收器所在线程上直接调度事件
if (QThread::currentThread() == threadData->thread) {
    return receiver->isWidgetType() ? QApplicationPrivate::dispatchWidgetEvent(receiver, event)
                                    : receiver->event(event);
}

// 向目标线程发送事件并等待完成
bool result = false;
QMetaCallEvent callEvent(QMetaMethod(), event, -1);
postEvent(receiver, &callEvent);

#if QT_CONFIG(thread)

// 等待事件处理完成
QtPrivate::RefCountPointer<QWaitCondition> waiter(new QWaitCondition());
QMutex mutex(QMutex::Recursive);

mutex.lock();
while (!callEvent.isPosted()) {
    waiter->wait(&mutex);
    qApp->processEvents(QEventLoop::ExcludeUserInputEvents);

    // 处理其他可能的任务或超时条件

    if (timeout_condition) {
        break;
    }
}

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