mirror of
https://github.com/rad4day/Waybar.git
synced 2023-12-21 10:22:59 +01:00
218 lines
5.8 KiB
C++
218 lines
5.8 KiB
C++
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#pragma once
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#include <mpd/client.h>
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#include <spdlog/fmt/bundled/format.h>
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#include <spdlog/spdlog.h>
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#include <condition_variable>
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#include <thread>
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#include "ALabel.hpp"
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namespace waybar::modules {
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class MPD;
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} // namespace waybar::modules
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namespace waybar::modules::detail {
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using unique_connection = std::unique_ptr<mpd_connection, decltype(&mpd_connection_free)>;
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using unique_status = std::unique_ptr<mpd_status, decltype(&mpd_status_free)>;
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using unique_song = std::unique_ptr<mpd_song, decltype(&mpd_song_free)>;
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class Context;
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/// This state machine loosely follows a non-hierarchical, statechart
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/// pattern, and includes ENTRY and EXIT actions.
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///
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/// The State class is the base class for all other states. The
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/// entry and exit methods are automatically called when entering
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/// into a new state and exiting from the current state. This
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/// includes initially entering (Disconnected class) and exiting
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/// Waybar.
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///
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/// The following nested "top-level" states are represented:
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/// 1. Idle - await notification of MPD activity.
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/// 2. All Non-Idle states:
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/// 1. Playing - An active song is producing audio output.
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/// 2. Paused - The current song is paused.
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/// 3. Stopped - No song is actively playing.
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/// 3. Disconnected - periodically attempt MPD (re-)connection.
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///
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/// NOTE: Since this statechart is non-hierarchical, the above
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/// states are flattened into a set.
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class State {
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public:
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virtual ~State() noexcept = default;
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virtual void entry() noexcept { spdlog::debug("mpd: ignore entry action"); }
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virtual void exit() noexcept { spdlog::debug("mpd: ignore exit action"); }
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virtual void play() { spdlog::debug("mpd: ignore play state transition"); }
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virtual void stop() { spdlog::debug("mpd: ignore stop state transition"); }
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virtual void pause() { spdlog::debug("mpd: ignore pause state transition"); }
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/// Request state update the GUI.
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virtual void update() noexcept { spdlog::debug("mpd: ignoring update method request"); }
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};
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class Idle : public State {
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Context* const ctx_;
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sigc::connection idle_connection_;
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public:
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Idle(Context* const ctx) : ctx_{ctx} {}
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virtual ~Idle() noexcept { this->exit(); };
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void entry() noexcept override;
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void exit() noexcept override;
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void play() override;
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void stop() override;
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void pause() override;
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void update() noexcept override;
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private:
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Idle(const Idle&) = delete;
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Idle& operator=(const Idle&) = delete;
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bool on_io(Glib::IOCondition const&);
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};
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class Playing : public State {
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Context* const ctx_;
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sigc::connection timer_connection_;
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public:
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Playing(Context* const ctx) : ctx_{ctx} {}
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virtual ~Playing() noexcept { this->exit(); }
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void entry() noexcept override;
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void exit() noexcept override;
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void pause() override;
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void stop() override;
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void update() noexcept override;
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private:
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Playing(Playing const&) = delete;
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Playing& operator=(Playing const&) = delete;
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bool on_timer();
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};
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class Paused : public State {
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Context* const ctx_;
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sigc::connection timer_connection_;
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public:
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Paused(Context* const ctx) : ctx_{ctx} {}
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virtual ~Paused() noexcept { this->exit(); }
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void entry() noexcept override;
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void exit() noexcept override;
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void play() override;
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void stop() override;
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void update() noexcept override;
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private:
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Paused(Paused const&) = delete;
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Paused& operator=(Paused const&) = delete;
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bool on_timer();
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};
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class Stopped : public State {
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Context* const ctx_;
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sigc::connection timer_connection_;
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public:
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Stopped(Context* const ctx) : ctx_{ctx} {}
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virtual ~Stopped() noexcept { this->exit(); }
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void entry() noexcept override;
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void exit() noexcept override;
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void play() override;
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void pause() override;
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void update() noexcept override;
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private:
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Stopped(Stopped const&) = delete;
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Stopped& operator=(Stopped const&) = delete;
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bool on_timer();
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};
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class Disconnected : public State {
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Context* const ctx_;
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sigc::connection timer_connection_;
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public:
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Disconnected(Context* const ctx) : ctx_{ctx} {}
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virtual ~Disconnected() noexcept { this->exit(); }
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void entry() noexcept override;
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void exit() noexcept override;
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void update() noexcept override;
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private:
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Disconnected(Disconnected const&) = delete;
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Disconnected& operator=(Disconnected const&) = delete;
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void arm_timer(int interval) noexcept;
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void disarm_timer() noexcept;
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bool on_timer();
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};
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class Context {
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std::unique_ptr<State> state_;
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waybar::modules::MPD* mpd_module_;
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friend class State;
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friend class Playing;
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friend class Paused;
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friend class Stopped;
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friend class Disconnected;
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friend class Idle;
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protected:
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void setState(std::unique_ptr<State>&& new_state) noexcept {
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if (state_.get() != nullptr) {
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state_->exit();
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}
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state_ = std::move(new_state);
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state_->entry();
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}
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bool is_connected() const;
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bool is_playing() const;
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bool is_paused() const;
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bool is_stopped() const;
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constexpr std::size_t interval() const;
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void tryConnect() const;
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void checkErrors(mpd_connection*) const;
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void do_update();
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void queryMPD() const;
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void fetchState() const;
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constexpr mpd_state state() const;
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void emit() const;
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[[nodiscard]] unique_connection& connection();
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public:
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explicit Context(waybar::modules::MPD* const mpd_module)
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: state_{std::make_unique<Disconnected>(this)}, mpd_module_{mpd_module} {
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state_->entry();
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}
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void play() { state_->play(); }
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void stop() { state_->stop(); }
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void pause() { state_->pause(); }
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void update() noexcept { state_->update(); }
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};
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} // namespace waybar::modules::detail
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