code_app/app/scanner/dialog_admin.cpp

#include "dialog_admin.h"
#include "ui_dialog_admin.h"
#include <QMessageBox>

Dialog_Admin::Dialog_Admin(const QString& password, QWidget *parent)
    : QDialog(parent)
    , ui(new Ui::Dialog_Admin)
{
    ui->setupUi(this);
    setWindowFlags(Qt::Dialog | Qt::WindowCloseButtonHint);

    ui->lineEdit->setPlaceholderText(tr("Type password"));
    ui->lineEdit->setEchoMode(QLineEdit::Password);
    ui->lineEdit->setMaxLength(20);
    m_password = password;

    QPixmap pixmap(":images/image_rsc/statusbar/statusBar_admin.png");
    pixmap = pixmap.scaled(ui->lab_adminIcon->size());
    ui->lab_adminIcon->setPixmap(pixmap);
}

Dialog_Admin::~Dialog_Admin()
{
    delete ui;
}


void Dialog_Admin::on_btn_signIn_clicked()
{
    if (ui->lineEdit->text() == m_password)
        done(1);
    else
        QMessageBox::warning(this,
                             tr("Warning"),
                             tr("Password incorrect. Please try again."));
}

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

void Dialog_Admin::on_cbtn_showPassword_toggled(bool checked)
{
    ui->lineEdit->setEchoMode(checked ? QLineEdit::Normal : QLineEdit::Password);
}

void Dialog_Admin::on_lineEdit_textChanged(const QString &arg1)
{
    ui->btn_signIn->setEnabled(!arg1.isEmpty());
}