Qt 的自定义事件

// myEvent.h
#include <QEvent>
#include <QString>
class myEvent : public QEvent
{
public:
    myEvent(QString str);
    static Type getMyType();
    QString getStr();
private:
    static Type myType;
    QString str_;
};
//myEvent.cpp
#include "myevent.h"
#include <QEvent>
QEvent::Type myEvent::myType = QEvent::None;

myEvent::myEvent(QString str)
    :QEvent(getMyType()),str_(str)
{

}
QEvent::Type myEvent::getMyType()
{
    if(myType == QEvent::None)
        myType = (QEvent::Type)QEvent::registerEventType(QEvent::User+100);
    return myType;
}
QString myEvent::getStr()
{
    return str_;
}

//Widget.h
class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = 0);
    ~Widget();
protected:
    bool event(QEvent *event);
public:
    void postEventfuc();

};

//widget.cpp
#include "widget.h"
#include <QPushButton>
#include <QCoreApplication>
#include "myevent.h"
#include <QDebug>
// 1 继承QEvent
// 2 定义一个设置 QEvent::Type 的值（QEvent::User ~ QEvent::MaxUser之间：例如 QEvent::User+1）
// 3 设置发送方式，QCoreApplication::postEvent 或者 QCoreApplication::sendEvent;
// 4 捕获自定义事件，在QWidget的子类中找到自定义类型的事件，并处理
Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    this->resize(200,200);
    QPushButton *pb = new QPushButton(this);
    pb->setText("this is a button");

    connect(pb,&QPushButton::clicked,this,[=]()->void{
        myEvent * myevent = new myEvent("this is my Event");
        QCoreApplication::postEvent(this,myevent);}
    );// 1.这里可以用lambda表达式，注意[=]，如果没有=，this传入不进来，显示this无法捕获。
      // 2.也可以用下面的槽函数。
}

void Widget::postEventfuc()
{
    myEvent * myevent = new myEvent("this is my Event");
    QCoreApplication::postEvent(this,myevent);
}
bool Widget::event(QEvent *event)
{
    if(event->type() == myEvent::getMyType())
    {
        myEvent *e = dynamic_cast<myEvent*>(event);
        qDebug() << e->getStr() << endl;
        return true;
    }
    else
        return QWidget::event(event);
}


Widget::~Widget()
{

}