第85课 - 多线程与界面组件的通信（下）

 

 

 

#ifndef WIDGET_H
#define WIDGET_H

#include <QtGui/QWidget>
#include <QPlainTextEdit>
#include "UpdateThread.h"

class Widget : public QWidget
{
    Q_OBJECT

    UpdateThread m_thread;
    QPlainTextEdit textEdit;

public:
    Widget(QWidget *parent = 0);
    bool event(QEvent *evt);
    ~Widget();
};

#endif // WIDGET_H

#ifndef UPDATETHREAD_H
#define UPDATETHREAD_H

#include <QThread>

class UpdateThread : public QThread
{
    Q_OBJECT

protected:
    void run();
public:
    explicit UpdateThread(QObject *parent = 0);
    
};

#endif // UPDATETHREAD_H

#ifndef _STRINGEVENT_H_
#define _STRINGEVENT_H_

#include <QEvent>
#include <QString>

class StringEvent : public QEvent
{
    QString m_data;
public:
    const static Type TYPE = static_cast<Type>(QEvent::User + 0xFF);

    explicit StringEvent(QString data = "");
    QString data();
    
};

#endif // _STRINGEVENT_H_

#include <QtGui/QApplication>
#include "Widget.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();
    
    return a.exec();
}

#include "Widget.h"
#include "StringEvent.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{

    textEdit.setParent(this);
    textEdit.move(20, 20);
    textEdit.resize(200, 150);
    textEdit.setReadOnly(true);

    m_thread.setParent(this);
    m_thread.start();
}

bool Widget::event(QEvent *evt)
{
    bool ret = true;

    if( evt->type() == StringEvent::TYPE )
    {
        StringEvent* se = dynamic_cast<StringEvent*>(evt);

        if( se != NULL )
        {
            textEdit.appendPlainText(se->data());
        }
    }
    else
    {
        ret = QWidget::event(evt);
    }

    return ret;
}

Widget::~Widget()
{
    
}

#include "StringEvent.h"

StringEvent::StringEvent(QString data) : QEvent(TYPE)
{
    m_data = data;
}

QString StringEvent::data()
{
    return m_data;
}

#include "UpdateThread.h"
#include <QApplication>
#include "StringEvent.h"

UpdateThread::UpdateThread(QObject *parent) :
    QThread(parent)
{
}

void UpdateThread::run()
{
    // emit updateUI("Begin");
    QApplication::postEvent(parent(), new StringEvent("Begin"));

    for(int i=0; i<10; i++)
    {
        // emit updateUI(QString::number(i));
        QApplication::postEvent(parent(), new StringEvent(QString::number(i)));

        sleep(1);
    }

    // emit updateUI("End");
    QApplication::postEvent(parent(), new StringEvent("End"));
}