code_app/app/scanner2/dialog_input.cpp

#include "dialog_input.h"
#include "ui_dialog_input.h"
#include <qmessagebox.h>
#include <QRegularExpression>
#include <QRegExpValidator>

Dialog_Input::Dialog_Input(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog_Input)
{
    ui->setupUi(this);
    setWindowFlags(Qt::Dialog | Qt::WindowCloseButtonHint);
    setWindowTitle(tr("configuration scheme name change"));

    ui->lineEdit->setMaxLength(20);
    QRegExp rx("[^\\s]+$");
    QRegExpValidator* validator = new QRegExpValidator(rx, this);
    ui->lineEdit->setValidator(validator);
}

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

void Dialog_Input::on_pushButton_clicked()
{
    QString text = ui->lineEdit->text();
    static QRegularExpression re("\\s");
    text.remove(re);//Remove space

    std::string str(text.toStdString());
    int pos = 0;
    while(pos < str.length() && str[pos++] == ' ');
    if(--pos > 0)
        str.erase(0, pos);
    pos = str.length() - 1;
    while(pos >= 0)
    {
        if(str[pos] != ' ')
            break;
    }
    str.erase(pos + 1);

//    if(str.empty())
//    {
//        QString title(QString::fromStdString("\351\224\231\350\257\257")),
//                text(QString::fromStdString("\350\276\223\345\205\245\351\235\236\346\263\225"));

//        QMessageBox::warning(this, title, text);

//        return;
//    }

    if (ui->lineEdit->text().isEmpty())
    {
        QMessageBox msg(QMessageBox::Information, tr("tips"), tr("The content can not be empty"), QMessageBox::Ok, this);
        msg.exec();
        return;
    }

    val_ = QString::fromStdString(str);
    accept();
}

void Dialog_Input::on_pushButton_2_clicked()
{
    reject();
}

void Dialog_Input::init_value(const QString& str)
{
    val_ = str;
    ui->lineEdit->setText(str);
    ui->lineEdit->setSelection(0, str.length());
}
QString Dialog_Input::get_inputting_value(void)
{
    return val_;
}

QString Dialog_Input::getText()
{
    QString text = ui->lineEdit->text();
    return text.toUtf8();
}

void Dialog_Input::setEditText(const QString& text)
{
    ui->lineEdit->setText(text);
    ui->lineEdit->selectAll();
}