cpp-rotor/include/rotor/wx/supervisor_wx.h

#pragma once

//
// Copyright (c) 2019-2020 Ivan Baidakou (basiliscos) (the dot dmol at gmail dot com)
//
// Distributed under the MIT Software License
//

#include "rotor/supervisor.h"
#include "rotor/wx/supervisor_config_wx.h"
#include "rotor/wx/system_context_wx.h"
#include <wx/event.h>
#include <wx/timer.h>
#include <memory>
#include <unordered_map>

namespace rotor {
namespace wx {

/** \struct supervisor_wx_t
 *  \brief delivers rotor-messages on top of wx event
 *
 *  Basically wx event handler is used as transport for wx-rotor-events,
 *  which wrap rotor-messages.
 *
 * Since wx-event loop is mainly GUI-loop, i.e. singleton, there are no
 * different execution contexts, i.e. only one (main) executing thread;
 * hence, there is no sense of having multiple supervisors.
 *
 * The wx-supervisor (and it's actors) role in `rotor` messaging is
 * to **abstract** destination endpoints from other non-wx (I/O) event
 * loops, i.e. show some information in corresponding field/window/frame/...
 * Hence, the receiving rotor-messages actors should be aware of your
 * wx-application system, i.e. hold refences to appropriate fields/windows
 * etc.
 *
 * The commands translaton (i.e. from click on the button to the `rotor`
 * -message send) should be also performed on wx-specific actors.
 *
 */
struct supervisor_wx_t : public supervisor_t {

    /** \brief injects an alias for supervisor_config_wx_t */
    using config_t = supervisor_config_wx_t;

    /** \brief injects templated supervisor_config_wx_builder_t */
    template <typename Supervisor> using config_builder_t = supervisor_config_wx_builder_t<Supervisor>;

    /** \brief constructs new supervisor from supervisor config */
    supervisor_wx_t(supervisor_config_wx_t &config);

    void start() noexcept override;
    void shutdown() noexcept override;
    void enqueue(message_ptr_t message) noexcept override;
    // void on_timer_trigger(request_id_t timer_id) noexcept override;

    /** \brief returns pointer to the wx system context */
    inline system_context_wx_t *get_context() noexcept { return static_cast<system_context_wx_t *>(context); }

  protected:
    /** \struct timer_t
     *  \brief timer structure, adoped for wx-supervisor needs.
     */
    struct timer_t : public wxTimer {
        /** \brief alias for intrusive pointer for the supervisor */
        using supervisor_ptr_t = intrusive_ptr_t<supervisor_wx_t>;

        /** \brief non-owning pointer to timer handler */
        timer_handler_base_t *handler;

        /** \brief intrusive pointer to the supervisor */
        supervisor_ptr_t sup;

        /** \brief constructs timer from wx supervisor */
        timer_t(timer_handler_base_t *handler, supervisor_ptr_t &&sup_);

        /** \brief invokes `shutdown_timer_trigger` method if shutdown timer triggers*/
        virtual void Notify() noexcept override;
    };

    friend struct timer_t;

    void do_start_timer(const pt::time_duration &interval, timer_handler_base_t &handler) noexcept override;
    void do_cancel_timer(request_id_t timer_id) noexcept override;

    /** \brief unique pointer to timer */
    using timer_ptr_t = std::unique_ptr<timer_t>;

    /** \brief timer id to timer pointer mapping type */
    using timers_map_t = std::unordered_map<request_id_t, timer_ptr_t>;

    /** \brief non-owning pointer to the wx application (copied from config) */
    wxEvtHandler *handler;

    /** \brief timer id to timer pointer mapping */
    timers_map_t timers_map;
};

} // namespace wx
} // namespace rotor