转载：

转载：

转载：

一、窗口类.h中

用到的头文件

#include <QStandardItemModel>

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

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

 

.cpp中

#include <QCompleter>

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));    }}

 

二、Qt自定义密码框，先显示后隐藏

转载：

转载：

  

#ifndef QPASSWORDLINEEDIT_H#define QPASSWORDLINEEDIT_H#include 
     
      class QPasswordLineEdit : public QLineEdit{    Q_OBJECTpublic:    //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 
     
      #include 
      
       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()
       
        text().length();    if(count>0)    {        for(int i=0;i
       
      
     

选中密码编辑框，然后右键，在弹出菜单中选择提升

 

点击提升就完成了，是不是非常简单