QT笔记之QLineEdit自动补全以及控件提升

转载：http://www.cnblogs.com/csuftzzk/p/qss_lineedit_completer.html?utm_source=tuicool&utm_medium=referral

转载：http://blog.csdn.net/starcloud_zxt/article/details/5186489

转载：http://blog.sina.com.cn/s/blog_a6fb6cc90101gu7w.html

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：http://blog.csdn.net/caoshangpa/article/details/50978164

转载：http://www.waitingfy.com/archives/1165

#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;
}

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