QT笔记之QLineEdit自动补全以及控件提升

//自动补全
    QStandardItemModel* m_Model ;
    QCompleter*  m_completer;

void onEmailChoosed(const QString& email);
void onTextChanged(const QString& str);

构造函数中
m_Model = new QStandardItemModel(0, 1, this);
m_completer = new QCompleter(m_Model, this);

    ui.userEdit->setCompleter(m_completer);

    connect(m_completer, SIGNAL(activated(const QString&)), this, SLOT(onEmailChoosed(const QString&)));
    connect(ui.userEdit, SIGNAL(textChanged(const QString&)), this, SLOT(onTextChanged(const QString&)));

void QT_Test::onEmailChoosed(const QString& email)
{
    ui.userEdit->clear();    // 清除已存在的文本更新内容
    ui.userEdit->setText(email);
}

void QT_Test::onTextChanged(const QString& str)
{
    if (str.contains("@"))   // 如果已经输入了@符号，我们就停止补全了。因为到了这一步，我们再补全意义也不大了。
    {
        return;
    }
    QStringList strlist;
    strlist << "@163.com" << "@qq.com" << "@gmail.com" << "@hotmail.com" << "@126.com";

    m_Model->removeRows(0, m_Model->rowCount());   // 先清楚已经存在的数据，不然的话每次文本变更都会插入数据，最后出现重复数据
    for (int i = 0; i < strlist.size(); ++i)
    {
        m_Model->insertRow(0);
        m_Model->setData(m_Model->index(0, 0), str + strlist.at(i));
    }
}

#ifndef QPASSWORDLINEEDIT_H
#define QPASSWORDLINEEDIT_H

#include <QLineEdit>
class QPasswordLineEdit : public QLineEdit
{
    Q_OBJECT
public:
    //默认输入300毫秒后消失
    QPasswordLineEdit(QWidget *parent,int timeout = 300);
    ~QPasswordLineEdit();

    //获取真实的密码
    QString getPassword();
    //设置显示到隐藏的时间间隔
    void setTimeout(int msec);

private slots:
    void slotCursorPositionChanged(int,int);
    void slotTextEdited(const QString&);
    //显示隐藏后的密码
    void slotDisplayMaskPassword();

private:
    //获取隐藏后的密码，这里为星号
    QString  getMaskPassword();

private:
    int    mTimeout;
    QString    mLineEditText;
    //到最后一个字符的长度
    int    mLastCharCount;
};

#endif // QPASSWORDLINEEDIT_H

#include "qpasswordlineedit.h"
#include <QTimer>
#include <QDebug>
QPasswordLineEdit::QPasswordLineEdit(QWidget *parent,int timeout) : QLineEdit(parent)
{
    mTimeout = timeout;
    mLineEditText = "";
    mLastCharCount = 0;
    connect(this,SIGNAL(cursorPositionChanged(int,int)),this,SLOT(slotCursorPositionChanged(int,int)));
    connect(this,SIGNAL(textEdited(const QString&)),this,SLOT(slotTextEdited(const QString&)));
}

QPasswordLineEdit::~QPasswordLineEdit()
{

}

void QPasswordLineEdit::slotCursorPositionChanged(int oldPos,int newPos)
{
    if(oldPos>=-1 && newPos>=0 )
    {
        if(newPos>oldPos)
        {
           QTimer::singleShot(mTimeout,this,SLOT(slotDisplayMaskPassword()));
        }
        else
        {
            this->setCursorPosition(oldPos);
        }
    }
}
void QPasswordLineEdit::slotDisplayMaskPassword()
{
    this->setText(getMaskPassword());
}

void QPasswordLineEdit::slotTextEdited(const QString& text)
{
    if(text.count()>mLastCharCount)//输入
    {
        mLineEditText.append(text.right(1));
    }
    else if(text.count()<mLastCharCount)//删除
    {
        mLineEditText.remove(mLineEditText.count()-1,1);
    }
    mLastCharCount = mLineEditText.count();
}

QString QPasswordLineEdit::getPassword()
{
    return mLineEditText;
}
void QPasswordLineEdit::setTimeout(int msec)
{
    mTimeout = msec;
}

QString QPasswordLineEdit::getMaskPassword()
{
    QString mask = "";
    int count = this->text().length();
    if(count>0)
    {
        for(int i=0;i<count;i++)
        {
            mask += "*";
        }
    }
    return mask;
}