求助！qt焦点事件！单击lineedit出软键盘，点击其他地方软键盘消失！急！！！在线等

#include "dialog.h"
#include "ui_dialog.h"

Dialog::Dialog(QWidget *parent) :
QDialog(parent),
ui(new Ui::Dialog)
{
ui->setupUi(this);
m_keyboard = new Widgetkeyboard();
ui->lineEdit->installEventFilter(this);
}

Dialog::~Dialog()
{
delete ui;
}

void Dialog::on_lineEdit_textChanged(const QString &arg1)
{
//m_keyboard ->show();
}

void Dialog::on_lineEdit_lostFocus()
{
m_keyboard->hide();//这是失去焦点 你看看怎么调
}
bool Dialog::eventFilter(QObject *watched, QEvent *event)
{
if (watched==ui->lineEdit) //首先判断控件(这里指 lineEdit1)
{
if (event->type()==QEvent::FocusIn) //然后再判断控件的具体事件 (这里指获得焦点事件)
{//这个是获得焦点你再找找办法

QString ret = m_keyboard.returnValue();//
ui->lineEdit->setText(ret);
QMessageBox::information(this,tr("消息"),"复制完成");
m_keyboard ->show();
ui->lineEdit->clearFocus();//防止weightMaxlineEdit重新获得焦点再一次激发时间
m_keyboard ->show();
}
}

return QWidget::eventFilter(watched,event); // 最后将事件交给上层对话框
}