making clangd happy and making script to compile/build with run.sh

app/mainwindow.h

@@ -0,0 +1,56 @@
+// Copyright (C) 2023 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QMainWindow>
+#include <QDir>
+#include <QStringLiteral>
+
+class AbstractViewer;
+class RecentFiles;
+class ViewerFactory;
+
+QT_BEGIN_NAMESPACE
+namespace Ui {
+class MainWindow;
+}
+QT_END_NAMESPACE
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    explicit MainWindow(QWidget *parent = nullptr);
+    ~MainWindow();
+
+public slots:
+    bool openFile(const QString &fileName);
+
+private slots:
+    void onActionOpenTriggered();
+    void onActionAboutTriggered();
+    void onActionAboutQtTriggered();
+
+private:
+    void readSettings();
+    void saveSettings() const;
+    void restoreViewerSettings();
+    void resetViewer() const;
+    void saveViewerSettings() const;
+
+    QDir m_currentDir;
+    AbstractViewer *m_viewer = nullptr;
+    std::unique_ptr<Ui::MainWindow> ui;
+    std::unique_ptr<RecentFiles> m_recentFiles;
+    std::unique_ptr<ViewerFactory> m_factory;
+
+    static constexpr QLatin1StringView settingsDir = QLatin1StringView("WorkingDir");
+    static constexpr QLatin1StringView settingsMainWindow = QLatin1StringView("MainWindow");
+    static constexpr QLatin1StringView settingsViewers = QLatin1StringView("Viewers");
+    static constexpr QLatin1StringView settingsFiles = QLatin1StringView("RecentFiles");
+};
+
+#endif // MAINWINDOW_H