message_loop.h

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class NOVTABLE message_filter
{
public:
    virtual bool pretranslate_message(MSG * p_msg) = 0;
};
 
class NOVTABLE idle_handler {
public:
    virtual bool on_idle() = 0;
};

class NOVTABLE message_loop : public service_base
{
public:
    virtual void add_message_filter(message_filter * ptr) = 0;
    virtual void remove_message_filter(message_filter * ptr) = 0;
 
    virtual void add_idle_handler(idle_handler * ptr) = 0;
    virtual void remove_idle_handler(idle_handler * ptr) = 0;

    FB2K_MAKE_SERVICE_INTERFACE_ENTRYPOINT(message_loop);
};

class NOVTABLE message_loop_v2 : public message_loop {
public:
    virtual void add_message_filter_ex(message_filter * ptr, t_uint32 lowest, t_uint32 highest) = 0;

    FB2K_MAKE_SERVICE_INTERFACE(message_loop_v2, message_loop);
};

class message_filter_impl_base : public message_filter {
public:
    message_filter_impl_base() {static_api_ptr_t<message_loop>()->add_message_filter(this);}
    message_filter_impl_base(t_uint32 lowest, t_uint32 highest) {
        static_api_ptr_t<message_loop> api;
        message_loop_v2::ptr apiV2;
        if (api->service_query_t(apiV2)) {
            apiV2->add_message_filter_ex(this, lowest, highest);
        } else {
            api->add_message_filter(this);
        }
    }
    ~message_filter_impl_base() {static_api_ptr_t<message_loop>()->remove_message_filter(this);}
    bool pretranslate_message(MSG * p_msg) {return false;}
    
    PFC_CLASS_NOT_COPYABLE(message_filter_impl_base,message_filter_impl_base);
};

class message_filter_impl_accel : public message_filter_impl_base {
protected:
    bool pretranslate_message(MSG * p_msg) {
        if (m_wnd != NULL) {
            if (GetActiveWindow() == m_wnd) {
                if (TranslateAccelerator(m_wnd,m_accel.get(),p_msg) != 0) {
                    return true;
                }
            }
        }
        return false;
    }
public:
    message_filter_impl_accel(HINSTANCE p_instance,const TCHAR * p_accel) : m_wnd(NULL) {
        m_accel.load(p_instance,p_accel);
    }
    void set_wnd(HWND p_wnd) {m_wnd = p_wnd;}
private:
    HWND m_wnd;
    win32_accelerator m_accel;

    PFC_CLASS_NOT_COPYABLE(message_filter_impl_accel,message_filter_impl_accel);
};

class message_filter_remap_f1 : public message_filter_impl_base {
public:
    bool pretranslate_message(MSG * p_msg) {
        if (IsOurMsg(p_msg) && m_wnd != NULL && GetActiveWindow() == m_wnd) {
            ::PostMessage(m_wnd, WM_SYSCOMMAND, SC_CONTEXTHELP, -1);
            return true;
        }
        return false;
    }
    void set_wnd(HWND wnd) {m_wnd = wnd;}
private:
    static bool IsOurMsg(const MSG * msg) {
        return msg->message == WM_KEYDOWN && msg->wParam == VK_F1;
    }
    HWND m_wnd;
};

class idle_handler_impl_base : public idle_handler {
public:
    idle_handler_impl_base() {static_api_ptr_t<message_loop>()->add_idle_handler(this);}
    ~idle_handler_impl_base() {static_api_ptr_t<message_loop>()->remove_idle_handler(this);}
    bool on_idle() {return true;}

    PFC_CLASS_NOT_COPYABLE_EX(idle_handler_impl_base)
};