简单的多线程与Qt:我这样做是正确的

我是新来的StackOverflow，想知道我这样做是否正确:

我正在写一个简单的Qt应用程序来测试多线程(我也是全新的东西)。我创建了一个包含小部件的主窗口和一个类MyThread，它继承了QThread并覆盖了run()方法。

应用程序简单地显示两个按钮，"开始计数器"answers"停止计数器"，和一个文本字段。当"启动计数器"被按下时，一个工作线程被创建并在后台运行，在while循环中不断增加计数器，并用更新的值向主线程(GUI所在的地方)发出信号。当"停止计数器"被按下时，一个信号被发送到主线程停止while循环，计数器停止直到"开始计数器"被再次按下。

这工作得很好…但这是最好的方法吗?我是新手，读过很多人说"不要子类化QThread"，其他人说"子类化QThread"，这有点令人困惑。如果这不是实现这类事情的最佳方式(在带有"开始"answers"停止"按钮的后台线程中运行计算密集型循环)，那是什么?如果我做错了，我怎么才能做对呢?我不想用错误的方法学习。

谢谢!下面是代码:

MyThread.h

#ifndef MYTHREAD_H
#define MYTHREAD_H
#include <QThread>
#include <QMutex>
class MyThread : public QThread
{
   Q_OBJECT
public slots:
    void stopRunning();
protected:
   virtual void run();
signals:
   void signalValueUpdated(QString);
private:
    bool isRunning;
};

MyThread.cpp

#include "MyThread.h"
#include <QString>
void MyThread::run()
{
    qDebug("Thread id inside run %d",(int)QThread::currentThreadId());
    static int value=0; //If this is not static, then it is reset to 0 every time this function is called.
    isRunning = 1;
    while(isRunning == 1)
    {
        QString string = QString("value: %1").arg(value++);
        sleep(1/1000); //If this isn't here, the counter increments way too fast and dies, or something; the app freezes, anyway.
        emit signalValueUpdated(string);       
    }            
}
void MyThread::stopRunning()
{
    isRunning = 0;
}

MainWindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QApplication>
#include <QPushButton>
#include <QHBoxLayout>
#include <QLineEdit>
#include "MyThread.h"
class MainWindow : public QWidget
{
  Q_OBJECT
  public:
    MainWindow(QWidget *parent = 0);
  private:
    //Widgets
    QHBoxLayout * boxLayout;
    QPushButton * startButton;
    QPushButton * stopButton;
    QLineEdit * lineEdit;
    MyThread thread;
};
#endif

MainWindow.cpp

#include "MainWindow.h"
MainWindow::MainWindow(QWidget *parent) : QWidget(parent)
{
    boxLayout = new QHBoxLayout(this);
    startButton = new QPushButton("Start Counter", this);
    stopButton = new QPushButton("Stop Counter", this);
    lineEdit = new QLineEdit(this);
    boxLayout->addWidget(startButton);
    boxLayout->addWidget(stopButton); 
    boxLayout->addWidget(lineEdit);
    qDebug("Thread id %d",(int)QThread::currentThreadId());
    //When the start button is pressed, invoke the start() method in the counter thread
    QObject::connect(startButton,SIGNAL(clicked()),&thread,SLOT(start()), Qt::QueuedConnection);
    //When the stop button is pressed, invoke the stop() method in the counter thread
    QObject::connect(stopButton,SIGNAL(clicked()),&thread,SLOT(stopRunning()), Qt::QueuedConnection);
    //When the counter thread emits a signal saying its value has been updated, reflect that change in the lineEdit field.
    QObject::connect(&thread,SIGNAL(signalValueUpdated(const QString&)),lineEdit,SLOT(setText(const QString&)), Qt::QueuedConnection);
}