app_close_blocker.h

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class NOVTABLE app_close_blocker : public service_base
{
public:
    virtual bool query() = 0;

    static bool g_query();

    FB2K_MAKE_SERVICE_INTERFACE_ENTRYPOINT(app_close_blocker);
};

class NOVTABLE app_close_blocking_task {
public:
    virtual void query_task_name(pfc::string_base & out) = 0;

protected:
    app_close_blocking_task() {}
    ~app_close_blocking_task() {}

    PFC_CLASS_NOT_COPYABLE_EX(app_close_blocking_task);
};

class NOVTABLE app_close_blocking_task_manager : public service_base {
public:
    virtual void register_task(app_close_blocking_task * task) = 0;
    virtual void unregister_task(app_close_blocking_task * task) = 0;
    

    FB2K_MAKE_SERVICE_INTERFACE_ENTRYPOINT(app_close_blocking_task_manager);
};

class app_close_blocking_task_impl : public app_close_blocking_task {
public:
    app_close_blocking_task_impl() { static_api_ptr_t<app_close_blocking_task_manager>()->register_task(this);}
    ~app_close_blocking_task_impl() { static_api_ptr_t<app_close_blocking_task_manager>()->unregister_task(this);}

    void query_task_name(pfc::string_base & out) { out = "<unnamed task>"; }
};

class app_close_blocking_task_impl_dynamic : public app_close_blocking_task {
public:
    app_close_blocking_task_impl_dynamic() : m_taskActive() {}
    ~app_close_blocking_task_impl_dynamic() { toggle_blocking(false); }

    void query_task_name(pfc::string_base & out) { out = "<unnamed task>"; }
    
protected:
    void toggle_blocking(bool state) {
        if (state != m_taskActive) {
            static_api_ptr_t<app_close_blocking_task_manager> api;
            if (state) api->register_task(this);
            else api->unregister_task(this);
            m_taskActive = state;
        }
    }
private:
    bool m_taskActive;
};