Qt如何实现密码框

这篇文章主要介绍“Qt如何实现密码框”，在日常操作中，相信很多人在Qt如何实现密码框问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”Qt如何实现密码框”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！

密码输入框

支持无可选择，不可复制，粘贴，可查看密码，全清除功能

环境

Qt5.6.2+ Vs2013

效果

代码

QPasswdLineEdit类

PasswdLineEdit.h

#ifndef PASSWDLINEEDIT_H#define PASSWDLINEEDIT_H#include <QLineEdit>#include <QPushButton>class QPasswdLineEdit : public QLineEdit{    Q_OBJECTpublic:    explicit QPasswdLineEdit(QWidget *parent = nullptr);    ~QPasswdLineEdit();    void setCopyAble(bool able);    void setSelection(bool able);    void setContextMenu(bool able);protected:    bool eventFilter(QObject *watched, QEvent *event);    private slots:    void slot_textChanged(const QString& text);    void slot_show();    void slot_hide();    void slot_clear();private:    QPushButton* x_pBtnShow;    QPushButton* x_pBtnHide;    QPushButton* x_pBtnClear;    bool x_bCopy;    //能否复制黏贴    bool x_bSelection;  //能否能选中    bool x_bContenx;  //是否存在右键菜单    bool x_bShow;};#endif // PASSWDLINEEDIT_H

PasswdLineEdit.cpp

#include "PasswdLineEdit.h"#include <QEvent>#include <QKeyEvent>#include <QPainter>#include <QHBoxLayout>#include <QSize>QPasswdLineEdit::QPasswdLineEdit(QWidget *parent)    : QLineEdit(parent)    , x_pBtnShow(nullptr)    , x_pBtnHide(nullptr)    , x_pBtnClear(nullptr)    , x_bCopy(false)    , x_bSelection(false)    , x_bContenx(false)    , x_bShow(false){    x_pBtnShow = new QPushButton(this);    x_pBtnHide = new QPushButton(this);    x_pBtnClear = new QPushButton(this);    setStyleSheet("QPushButton{border:none;}");    QPixmap _pixClear(":/image/clear");    x_pBtnClear->setIcon(_pixClear);    x_pBtnClear->setIconSize(_pixClear.size());    x_pBtnClear->setCursor(Qt::PointingHandCursor);    x_pBtnClear->setToolTip(QString::fromLocal8Bit("清理"));    QPixmap _pixShow(":/image/show");    x_pBtnShow->setIcon(_pixShow);    x_pBtnShow->setIconSize(_pixShow.size());    x_pBtnShow->setCursor(Qt::PointingHandCursor);    x_pBtnShow->setToolTip(QString::fromLocal8Bit("查看密码"));    QPixmap _pixHide(":/image/hide");    x_pBtnHide->setIcon(_pixHide);    x_pBtnHide->setIconSize(_pixHide.size());    x_pBtnHide->setCursor(Qt::PointingHandCursor);    x_pBtnHide->setToolTip(QString::fromLocal8Bit("隐藏密码"));    QHBoxLayout* _pHLayout = new QHBoxLayout();    _pHLayout->addStretch();    _pHLayout->addWidget(x_pBtnShow);    _pHLayout->addWidget(x_pBtnHide);    _pHLayout->addWidget(x_pBtnClear);    _pHLayout->setMargin(0);    _pHLayout->setSpacing(0);    x_pBtnShow->hide();    x_pBtnHide->hide();    x_pBtnClear->hide();    this->setLayout(_pHLayout);    this->setTextMargins(1, 1, 1, 1);    setFixedHeight(30);    //密码显示模式    setEchoMode(QLineEdit::Password);    if (x_bContenx)    {        this->setContextMenuPolicy(Qt::DefaultContextMenu);    }    else    {        this->setContextMenuPolicy(Qt::NoContextMenu);    }    this->installEventFilter(this);    connect(this, SIGNAL(textChanged(const QString&)), this, SLOT(slot_textChanged(const QString&)));    connect(x_pBtnShow, SIGNAL(clicked()), this, SLOT(slot_show()));    connect(x_pBtnHide, SIGNAL(clicked()), this, SLOT(slot_hide()));    connect(x_pBtnClear, SIGNAL(clicked()), this, SLOT(slot_clear()));}QPasswdLineEdit::~QPasswdLineEdit(){}void QPasswdLineEdit::setCopyAble(bool able){    x_bCopy = able;}void QPasswdLineEdit::setSelection(bool able){    x_bSelection = able;}void QPasswdLineEdit::setContextMenu(bool able){    x_bContenx = able;    if (x_bContenx)    {        this->setContextMenuPolicy(Qt::DefaultContextMenu);    }    else    {        this->setContextMenuPolicy(Qt::NoContextMenu);    }}bool QPasswdLineEdit::eventFilter(QObject *watched, QEvent *event){    QPasswdLineEdit* _pObj = qobject_cast<QPasswdLineEdit*>(watched);    if (_pObj == this)    {        switch (event->type())        {        case QEvent::MouseMove:        case QEvent::MouseButtonDblClick:            return !x_bSelection;            break;        case QEvent::MouseButtonPress:            {                QMouseEvent* _pMouseEvent = static_cast<QMouseEvent*>(event);                if (_pMouseEvent->button() == Qt::RightButton)                {                    return !x_bContenx;                }            }            break;        default:            break;        }    }    return QLineEdit::eventFilter(watched, event);}void QPasswdLineEdit::slot_textChanged(const QString& text){    if (!text.isEmpty())    {        setTextMargins(1, 1, 36, 1);        if (x_bShow)        {            x_pBtnShow->hide();            x_pBtnHide->show();        }        else        {            x_pBtnShow->show();            x_pBtnHide->hide();        }        x_pBtnClear->show();    }    else    {        x_pBtnShow->hide();        x_pBtnHide->hide();        x_pBtnClear->hide();        x_bShow = false;        setEchoMode(QLineEdit::Password);        this->setTextMargins(1, 1, 1, 1);    }}void QPasswdLineEdit::slot_show(){    x_bShow = true;    setEchoMode(QLineEdit::Normal);    x_pBtnShow->hide();    x_pBtnHide->show();}void QPasswdLineEdit::slot_hide(){    setEchoMode(QLineEdit::Password);    x_pBtnShow->show();    x_pBtnHide->hide();}void QPasswdLineEdit::slot_clear(){    clear();}

使用

x_pPsdEdit = new QPasswdLineEdit(this);QGridLayout* _pGLayout = new QGridLayout();_pGLayout->addWidget(x_pPsdEdit);setLayout(_pGLayout);

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