VideoRecorder/src/Base/FunctionTransfer.cpp

/**
 * 叶海辉
 * QQ群121376426
 * http://blog.yundiantech.com/
 */

#include "FunctionTransfer.h"

#include <QThread>
#include <QDebug>

Qt::HANDLE FunctionTransfer::gMainThreadId = nullptr;
FunctionTransfer *FunctionTransfer::main_thread_forward = nullptr;

Q_DECLARE_METATYPE(std::function<void()>)

FunctionTransfer::FunctionTransfer(QObject *parent) :
    QObject(parent)
{
    //因为std::function<void()>是自定义的类型 要跨线程传递需要先注册一下
    qRegisterMetaType<std::function<void()>>();

    connect(this, SIGNAL(comming(std::function<void()>)), this, SLOT(slotExec(std::function<void()>)), Qt::BlockingQueuedConnection);
    connect(this, SIGNAL(comming_noBlock(std::function<void()>)), this, SLOT(slotExec(std::function<void()>)), Qt::QueuedConnection);
}

FunctionTransfer::~FunctionTransfer()
{

}

void FunctionTransfer::init()
{
    FunctionTransfer::init(QThread::currentThreadId());
}

void FunctionTransfer::init(Qt::HANDLE id)
{
    gMainThreadId = id;
    FunctionTransfer::main_thread_forward = new FunctionTransfer();
}

bool FunctionTransfer::isMainThread()
{
    if (gMainThreadId == nullptr)
    {
        qDebug()<<__FILE__<<__LINE__<<__FUNCTION__<<"the main thread id is not set!";
        return false;
    }

    if (QThread::currentThreadId() == gMainThreadId)
    {
        return true;
    }
    else
    {
        return false;
    }
}

void FunctionTransfer::runInMainThread(std::function<void()> f, bool isBlock)
{
//    FunctionTransfer::main_thread_forward->exec(f, isBlock);
    if(FunctionTransfer::isMainThread())
    {
        f();
    }
    else
    {
        if (isBlock)
        {
            Q_EMIT FunctionTransfer::main_thread_forward->comming(f);
        }
        else
        {
            Q_EMIT FunctionTransfer::main_thread_forward->comming_noBlock(f);
        }
    }
}

void FunctionTransfer::slotExec(std::function<void()> f)
{
    f();
//    if(FunctionTransfer::isMainThread())
//    {
//        f();
//    }
//    else
//    {
//        if (isBlock)
//        {
//            Q_EMIT this->comming(f);
//        }
//        else
//        {
//            Q_EMIT this->comming_noBlock(f);
//        }
//    }
}