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//mylineedit.h
ifndef MYLINEEDIT_H
#define MYLINEEDIT_H
#include <QLineEdit>
#include <QEvent>
#include <QInputMethodEvent>
class MyLineEdit : public QLineEdit
{
    Q_OBJECT
public:
    MyLineEdit(QWidget* parent) : QLineEdit(parent)
    {
        //installEventFilter(this);
    }

    bool eventFilter(QObject *obj, QEvent *e)
    {
        if (obj == this)
        {
            if (e->type() == QEvent::KeyPress)
            {
                emit imputMethodRaised("ImputMethod");
                return true;
            }
        }
        return false;
    }
protected:
    void inputMethodEvent(QInputMethodEvent *e)
    {
        QLineEdit::inputMethodEvent(e);
        emit imputMethodRaised("ImputMethod");
    }

signals:
    void imputMethodRaised(const QString &flag);
};

#endif // MYLINEEDIT_H
//mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    connect(ui->lineEdit, SIGNAL(imputMethodRaised(QString)), this, SLOT(inputMethodR(QString)));
    ui->lineEdit->setAttribute(Qt::WA_InputMethodEnabled);
}

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

void MainWindow::inputMethodR(QString str)
{
    ui->label->setText(str);
}

const QString &	commitString () const
const QString &	preeditString () const
int	replacementLength () const
int	replacementStart () const