QT中自定义了可移动按钮类（继承QPushButton），槽函数无用的问题

[天真的]

本人萌新，QT也是刚学两天，我自定义了一个mybutton类，它继承自QPushButton类，添加了三个函数使之可在窗口内移动。之后想增加一个槽，使放开按钮时关闭窗口，却发现无法实现该功能。请问是什么原因，以及应该如何修改，求前辈指点。下面是我的代码。
mybutton.h

#ifndef MYBUTTON_H
#define MYBUTTON_H

#include <QWidget>
#include <QPushButton>
#include <QDebug>
#include <QPoint>

class mybutton : public QPushButton
{
    Q_OBJECT
public:
    mybutton(const QString & text, QWidget * parent = 0);

    virtual void mouseMoveEvent(QMouseEvent * e);

    virtual void mousePressEvent(QMouseEvent * e);

    virtual void keyPressEvent(QKeyEvent * e);

private:
    QPoint m_beginPos;
    QPoint m_lastPos;

signals:

public slots:
};

#endif // MYBUTTON_H

mybutton.cpp

#include "mybutton.h"
#include "QMouseEvent"
#include "QKeyEvent"

mybutton::mybutton(const QString &text, QWidget *parent)
 :QPushButton(text,parent)
{
}

void mybutton::mouseMoveEvent(QMouseEvent *e)
{
    qDebug() << "mouse move!";

    m_lastPos = e->pos();

    int t_xDistance = m_lastPos.x() - m_beginPos.x();
    int t_yDistance = m_lastPos.y() - m_beginPos.y();
    if((this->x()+t_xDistance<=parentWidget()->width()-this->width()) && (this->y()+t_yDistance<=parentWidget()->height()-this->height()) && this->x()+t_xDistance>=0 && this->y()+t_yDistance>=0)
        this->move(this->x()+t_xDistance,this->y()+t_yDistance);
}

void mybutton::mousePressEvent(QMouseEvent *e)
{
    m_beginPos = e->pos();
}

void mybutton::keyPressEvent(QKeyEvent *e)
{
    qDebug() << "key press!";

    if(e->key() == Qt::Key_Left)
    {
        qDebug() << "key_left press!";
        if(this->x()-4>=0)
            this->move(this->x()-4,this->y());
    }
    else if(e->key() == Qt::Key_Right)
    {
        qDebug() << "key_right press!";
        if(parentWidget()->width()-this->width()-this->x()-4>=0)
            this->move(this->x()+4,this->y());
    }
    else if(e->key() == Qt::Key_Up)
    {
        qDebug() << "key_up press!";
        if(this->y()-4>=0)
            this->move(this->x(),this->y()-4);
    }
    else if(e->key() == Qt::Key_Down)
    {
        qDebug() << "key_down press!";
        if(parentWidget()->height()-this->height()-this->y()-4>=0)
            this->move(this->x(),this->y()+4);
    }
}

widgetbutton.h

#ifndef WIDGETBUTTON_H
#define WIDGETBUTTON_H

#include <QWidget>
#include "mybutton.h"

class WidgetButton : public QWidget
{
    Q_OBJECT

public:
    WidgetButton(QWidget *parent = 0);
    ~WidgetButton();

private:
    mybutton *m_moveBtn;
};

#endif // WIDGETBUTTON_H

widgetbutton.cpp

#include "widgetbutton.h"
#include "mybutton.h"

WidgetButton::WidgetButton(QWidget *parent)
    : QWidget(parent)
{
    m_moveBtn = new mybutton("move",this);
    this->resize(400,400);
    connect(m_moveBtn,SIGNAL(released()),this,SLOT(close()));//我想实现的功能
}

[huo5896324]

应该是你处理完这些鼠标事件后没有将事件再交给父类去处理，所以不会发送出released信号，你在每个事件里加上
QPushButton::xx事件(e);试试

[天真的]

可以解决，谢谢帮助。