QT中实现类似网页搜索的自动出现下拉提示

要实现一个在输入框中输入字时，自动出现一个下拉框提示相关的搜索词语。在网上搜了一下，没搜到有QT中相关的实现，就自己动手实现了一个。

class HintList : public QListWidget 

#include "HintList.h"

HintList::HintList(QWidget *parent) : QListWidget(parent)
{

 myTimer=new QTimer();
    myTimer->start(2000);
connect(myTimer,SIGNAL(timeout()),this,SLOT(checkSlots()));
}

HintList::~HintList()
{

}

void HintList::ShowUI()
{
 this->show();
    myTimer->stop();
    myTimer->start();
}

void HintList::keyPressEvent(QKeyEvent *event)
{
 if(event->key() == Qt::Key_Down)
 {
 this->setCurrentRow(this->currentRow()+1);
        myTimer->stop();
        myTimer->start();
    }
    else if(event->key() == Qt::Key_Up)
    {
        this->setCurrentRow(this->currentRow()-1);
        myTimer->stop();
        myTimer->start();
    }
    else if(event->key() == Qt::Key_Enter || event->key() == Qt::Key_Return)
    {
        emit choiceStr(this->currentItem()->text());
        this->close();
    }
}

void HintList::checkSlots()
{
 myTimer->stop();
    this->close();
}

实现：

m_list_hint= new HintList(this);
m_list_hint->hide();
connect(ui->lineEdit_fromStation,SIGNAL(textChanged(QString)),this,SLOT(flushFromStationListWidget(QString)));
connect(m_list_hint,SIGNAL(clicked(QModelIndex)),this,SLOT(onClickedListWidget(QModelIndex)));
connect(m_list_hint,SIGNAL(choiceStr(QString)),this,SLOT(changeFromStationText(QString)));


……
void Sale::flushFromStationListWidget(QString str)
{
    m_list_hint->clear();

    m_list_hint->addItem("dsa");
    m_list_hint->addItem("eea");
    m_list_hint->addItem("武汉a");
    int x = ui->lineEdit_fromStation->x() + 4;
    int y = ui->lineEdit_fromStation->y() + 44;
    int w = ui->lineEdit_fromStation->width();
    int h = m_list_hint->count() * 20 ;

    m_list_hint->setGeometry(x,y,w,h);
    m_list_hint->setCurrentRow(0);
    m_list_hint->ShowUI();
}
void Sale::keyPressEvent(QKeyEvent *event)
{
if(event->key() == Qt::Key_Down)
    {
if(this->focusWidget() == ui->lineEdit_fromStation)
        {
            m_list_hint->setFocus();
            m_list_hint->setCurrentRow(0);
        }
    }
}

void Sale::onClickedListWidget(QModelIndex index)
{
    ui->lineEdit_fromStation->setText(m_list_hint->item(index.row())->text());
    m_list_hint->hide();
}

void Sale::changeFromStationText(QString text)
{
    ui->lineEdit_fromStation->setText(text);
}