其實就是和Qt::QueuedConnection時的信號槽一樣，屬於異步的。
1、新建QEvent子類
①、頭文件
#ifndef MYEVENT_H
#define MYEVENT_H
#include <QString>
#include <QEvent>
class MyEvent : public QEvent
{
QString m_data;
public:
const static Type TYPE = static_cast<Type>(QEvent::User + 0xFF);
MyEvent(QString data = "");
QString data();
};
#endif // MYEVENT_H
②、cpp
#include "myevent.h"
MyEvent::MyEvent(QString data) : QEvent(TYPE)
{
m_data = data;
}
QString MyEvent::data()
{
return m_data;
}
2、在任何需要發送消息的地方
QApplication::postEvent(parent(), new MyEvent("Begin"));//必須在堆上建空間
for(int i=0; i<10000; i++)
{
QApplication::postEvent(parent(), new MyEvent(QString::number(i)));
msleep(1);
}
QApplication::postEvent(parent(), new MyEvent("End"));
3、在主界面中處理消息
bool MainWindow::event(QEvent *evt)
{
bool ret = true;
if( evt->type() == MyEvent::TYPE )
{
MyEvent* se = dynamic_cast<MyEvent*>(evt);
if( se != NULL )
{
ui->plainTextEdit->appendPlainText(se->data());
}
}
else
{
ret = QWidget::event(evt);
}
return ret;
}