code_app/app/scanner2/dialog_passwordchange.cpp

#include "dialog_passwordchange.h"
#include "ui_dialog_passwordchange.h"
#include <QMessageBox>
#include <QPushButton>
#include <QRegExpValidator>
#include <QToolTip>

Dialog_PasswordChange::Dialog_PasswordChange(const QString &old_password, QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog_PasswordChange),
    m_old_password(old_password),
    m_new_password("")
{
    ui->setupUi(this);
    setWindowFlags(Qt::Dialog | Qt::WindowCloseButtonHint);
    QRegExp rx("[a-zA-Z0-9!@#%^&*()_]+$"); //创建一个正则表达式对象rx
    qReg = new QRegExpValidator(rx, this); //创建一个过滤器对象
    m_lineEditList<<ui->lineEdit_oldPassword<<ui->lineEdit_newPassword<<ui->lineEdit_confirmPassword;
    foreach(QLineEdit* item, m_lineEditList)
    {
        item->setEchoMode(QLineEdit::Password);
        item->setMaxLength(20);
        item->setValidator(qReg);
    }
    m_lineEditList[0]->setPlaceholderText(tr("Type old password"));
    m_lineEditList[1]->setPlaceholderText(tr("Type new password"));
    m_lineEditList[2]->setPlaceholderText(tr("Retype new password"));
}

Dialog_PasswordChange::~Dialog_PasswordChange()
{
    delete qReg;
    delete ui;
}

QString Dialog_PasswordChange::getNewPassword()
{
    return m_new_password;
}

void Dialog_PasswordChange::on_cbtn_showPassword_toggled(bool checked)
{
    foreach(QLineEdit* item, m_lineEditList)
        item->setEchoMode(checked ? QLineEdit::Normal : QLineEdit::PasswordEchoOnEdit);
}

void Dialog_PasswordChange::on_lineEdit_oldPassword_textChanged(const QString &arg1)
{
    ui->btn_ok->setEnabled(arg1.length() >= 8 && ui->lineEdit_newPassword->text().length() >= 8 && ui->lineEdit_confirmPassword->text().length() >= 8);
}

void Dialog_PasswordChange::on_lineEdit_newPassword_textChanged(const QString &arg1)
{
    ui->btn_ok->setEnabled(arg1.length() >= 8 && ui->lineEdit_newPassword->text().length() >= 8 && ui->lineEdit_confirmPassword->text().length() >= 8);
}

void Dialog_PasswordChange::on_lineEdit_confirmPassword_textChanged(const QString &arg1)
{
    ui->btn_ok->setEnabled(arg1.length() >= 8 && ui->lineEdit_newPassword->text().length() >= 8 && ui->lineEdit_confirmPassword->text().length() >= 8);
}

void Dialog_PasswordChange::on_btn_ok_clicked()
{
    if(ui->lineEdit_oldPassword->text() != m_old_password)
        QMessageBox::warning(this,
                             tr("Warning"),
                             tr("Old password incorrect.\n"
                             "Please try again."));
    else if(ui->lineEdit_newPassword->text() != ui->lineEdit_confirmPassword->text())
        QMessageBox::warning(this,
                             tr("Warning"),
                             tr("New password and confirm password are not matched.\n"
                             "Please make sure the two passwords are the same."));
    else
    {
        m_new_password = ui->lineEdit_newPassword->text();
        done(1);
    }
}

void Dialog_PasswordChange::on_btn_cancel_clicked()
{
    done(0);
}

void Dialog_PasswordChange::on_lineEdit_oldPassword_inputRejected()
{
    QToolTip::showText(mapToGlobal(ui->lineEdit_oldPassword->pos()),
                       tr("Password only allowed to use numbers, English and special characters."));
}

void Dialog_PasswordChange::on_lineEdit_newPassword_inputRejected()
{
    QToolTip::showText(mapToGlobal(ui->lineEdit_newPassword->pos()),
                       tr("Password only allowed to use numbers, English and special characters."));
}

void Dialog_PasswordChange::on_lineEdit_confirmPassword_inputRejected()
{
    QToolTip::showText(mapToGlobal(ui->lineEdit_confirmPassword->pos()),
                       tr("Password only allowed to use numbers, English and special characters."));
}