QT筆記之QLineEdit自動補全以及控件提升

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

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

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

一、窗口類.h中

用到的頭文件

#include <QStandardItemModel>

//自動補全
    QStandardItemModel* m_Model ;
    QCompleter*  m_completer;

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

 

.cpp中

#include <QCompleter>

構造函數中
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內容
    ui.userEdit->setText(email);
}

void QT_Test::onTextChanged(const QString& str)
{
    if (str.contains("@"))   // 如果已經輸入了@符號，我們就停止補全了。因為到了這一步，我們再補全意義也不大了。
    {
        return;
    }
    QStringList strlist;
    strlist << "@163.com" << "@qq.com" << "@gmail.com" << "@hotmail.com" << "@126.com";

    m_Model->removeRows(0, m_Model->rowCount());   // 先清楚已經存在的數據，不然的話每次文本變更都會插入數據，最后出現重復數據
    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自定義密碼框，先顯示后隱藏

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

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

  

#ifndef QPASSWORDLINEEDIT_H
#define QPASSWORDLINEEDIT_H

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

    //獲取真實的密碼
    QString getPassword();
    //設置顯示到隱藏的時間間隔
    void setTimeout(int msec);

private slots:
    void slotCursorPositionChanged(int,int);
    void slotTextEdited(const QString&);
    //顯示隱藏后的密碼
    void slotDisplayMaskPassword();

private:
    //獲取隱藏后的密碼，這里為星號
    QString  getMaskPassword();

private:
    int    mTimeout;
    QString    mLineEditText;
    //到最后一個字符的長度
    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)//輸入
    {
        mLineEditText.append(text.right(1));
    }
    else if(text.count()<mLastCharCount)//刪除
    {
        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;
}

選中密碼編輯框，然后右鍵，在彈出菜單中選擇提升

 

點擊提升就完成了，是不是非常簡單