承袭QTextEditor后改了一下keyPressEvent()，然后不能向里面输入内容了

#ifndef CODEEDITOR_H
#define CODEEDITOR_H
#include<QTextEdit>
//#include<QKeyEvent>
class CodeEditor:public QTextEdit
{
    Q_OBJECT
protected:
    void keyPressEvent(QKeyEvent *e);
};

#endif // CODEEDITOR_H

#include "codeeditor.h"
#include<QKeyEvent>
#include<QDebug>
#include<qwidget.h>
void CodeEditor::keyPressEvent(QKeyEvent *e)
{
	
    switch(e->key())
    {
      case Qt::Key_Home:
		qDebug()<<"press";
		if(e->modifiers()&Qt::ControlModifier)
        {
            this->setText("KeyPress Success!!");
        }
		break;
      default:
        QWidget::keyPressEvent(e);     //其他按键按QWidget的keyPressEvent()处理
    }
}