Qt 解决用QLineEdit实现的输入框开始没有光标在闪烁的问题

在项目中遇到new出来QLineEdit在开始时，没有光标在闪烁，此时需要重写QlineEdit

代码如下：

.h文件

class CLineEidt : public QLineEdit
{
    Q_OBJECT
public:
    CLineEidt(QWidget *parent = NULL);
    ~CLineEidt();
protected:
    virtual void focusInEvent(QFocusEvent *e);
    virtual void focusOutEvent(QFocusEvent *e);
    virtual void showEvent(QShowEvent *event);
private:
signals :
    void focusOut(CLineEidt *);
    void focusIn(CLineEidt *);
};

.cpp文件

CLineEidt::CLineEidt(QWidget *parent /*= NULL*/) :QLineEdit(parent)
{

}

CLineEidt::~CLineEidt()
{

}

void CLineEidt::focusInEvent(QFocusEvent *e)
{
    QLineEdit::focusInEvent(e);
    emit focusIn(this);
}

void CLineEidt::focusOutEvent(QFocusEvent *e)
{
    QLineEdit::focusOutEvent(e);
    emit focusOut(this);
}

void CLineEidt::showEvent(QShowEvent *event)
{
    setEnabled(true);
    setFocus();
    QLineEdit::showEvent(event);
}

调用如下：

   CLineEidt *m_filterInputLineEdit = new CLineEidt();
    m_filterInputLineEdit->setObjectName("filterInputLineEdit");
     m_filterInputLineEdit->setFixedHeight(40);
     m_filterInputLineEdit->setMaxLength(60);
    m_filterInputLineEdit->setStyleSheet("QLineEdit#filterInputLineEdit{border: 1px solid rgb(224,229,237);}");

//关联槽函数，处理失去焦点与获得焦点的响应函数

    connect(m_filterInputLineEdit, SIGNAL(focusOut(CLineEidt*)), this, SLOT(onFoucusOut(CLineEidt*)));
    connect(m_filterInputLineEdit, SIGNAL(focusIn(CLineEidt*)), this, SLOT(onFoucusIn(CLineEidt*)));