code_app/app/scantool/dialog_scan.cpp

#include "dialog_scan.h"
#include "ui_dialog_scan.h"
#include <QCloseEvent>
#include "mainwindow.h"

Dialog_Scan::Dialog_Scan(class MainWindow *mainWnd)
    : QDialog(nullptr)
    , ui(new Ui::Dialog_Scan)
    , m_mainWnd(mainWnd)
{
    ui->setupUi(this);
    setWindowFlags(Qt::Dialog | Qt::WindowCloseButtonHint);
}

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

void Dialog_Scan::closeEvent(QCloseEvent *e)
{
    hide(); // 隐藏主窗口
    e->ignore(); //忽略关闭事件，这样才不会关闭程序
}