mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "noteeditor.h"
#include <QDir>
#include <QListWidgetItem>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent), ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    connect(ui->btnAddNote, &QPushButton::clicked, this, &MainWindow::onAddNote);
    connect(ui->listNotes, &QListWidget::itemClicked, this, &MainWindow::onNoteClicked);

    loadNotes();
}

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

void MainWindow::loadNotes()
{
    ui->listNotes->clear();
    QDir notesDir("notes");
    if (!notesDir.exists()) notesDir.mkpath(".");
    QStringList files = notesDir.entryList(QStringList() << "*.txt", QDir::Files);

    for (const QString &file : files) {
        ui->listNotes->addItem(file.left(file.length()-4));
    }
}

void MainWindow::onAddNote()
{
    NoteEditor editor(this);
    editor.exec();
    loadNotes();
}

void MainWindow::onNoteClicked(QListWidgetItem* item)
{
    NoteEditor editor(this, item->text());
    editor.exec();
    loadNotes();
}

void MainWindow::on_btnExit_clicked()
{
     QApplication::quit();
}