Implementation of application for Linux platform.

You can find more information in comments below. Overrided methods can be found in corresponding base interface.

class CApplication :public virtual IApplication
    {
    public:
        struct FONT_FACE // Describe loaded font face 
        {
            void *Face;
            String Name;
            int RefCount;
            bool Default;
        };
    public:
        void(*OnDestroyLastWindow)(); // Event called right after destroying the last window in application windows list 
    
        int getWindowCount() override;
        IWindow *getWindow(const int index) override;
        IForm *getWindowForm(const int index) override;
        IForm *getMainForm() override;
        IKeyboard *getKeyboard() override;
        IMouse *getMouse() override;
        ITranslate *getTranslate() override;
        IStyles *getStyles() override;
        IScreen *getScreen() override;
        ISystem *getSystem() override;
        IPicture *getPicture() override;
        IDialogs *getDialogs() override;
        IFileSystem *getFileSystem() override;
        const String &getApplicationFileName() const override;
        const String &getApplicationDirectory() const override;
        INetwork *getNetwork() override;
        const String &getModuleFileName() const override;
        const String &getModuleDirectory() const override;
        IEditor *getEditor() override; // Return nullptr 
        bool isUseDialogBoxes() override;
        bool isGlobal() override; // Return true 
    
        bool setMainForm(IForm *value) override;
    
        int Run() override;
        void ProcessMessages() override;
        void RepaintAll() override;
        IApplicationService *QueryService() override;
        IThread *CreateThread(const bool paused, IThreadListener *listener) override;
    
        CApplication();
        virtual ~CApplication();
    
        CLOSE_ACTION getCloseAction(IWindow *window); // Return default close action for specified window. caFree by default. But if handle belongs to form and this form isn't same as main form, than close action is hide 
        FONT_FACE *LoadFontFace(const String &filename); // Load font or return existing one 
        FONT_FACE *LoadDefaultFontFace(const String &filename); // Load default font or return existing one 
        void FreeFontFace(FONT_FACE *face); // Free font if it is not used anymore. Each call of LoadFontFace/LoadDefaultFontFace should correspond the same count of calls of FreeFontFace 
    };

The usage is quite simple.

void main()
    {
        CMyForm *form; // Your form(s) 
        CApplication app; // Create application 
        app.CreateForm(&form); // Create form(s) 
        app.Run(); // Run application 
    }

or

int CALLBACK WinMain(HINSTANCE, HINSTANCE, LPSTR, int)
    {
        CMyForm *form; // Your form(s) 
        CApplication app; // Create application 
        app.CreateForm(&form); // Create form(s) 
        return app.Run(); // Run application 
    }