Event.hh

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#ifndef EVENT_HH
#define EVENT_HH
 
#include "JoystickId.hh"
#include "SDLKey.hh"
#include "StringStorage.hh"
#include "TclObject.hh"
 
#include "static_vector.hh"
#include "stl.hh"
 
#include <cassert>
#include <cstdint>
#include <string>
#include <utility>
#include <variant>
 
#include <SDL.h>
 
namespace openmsx {
 
class CliConnection;
enum class EventType : uint8_t;
 
// --- The actual event classes (the Event class refers to one of these) ---
 
class EventBase {};
 
class SdlEvent : public EventBase
{
public:
        explicit SdlEvent(const SDL_Event& e) : evt(e) {}
        [[nodiscard]] const SDL_Event& getSdlEvent() const { return evt; }
        [[nodiscard]] const SDL_CommonEvent& getCommonSdlEvent() const { return evt.common; }
 
protected:
        SDL_Event evt;
};
 
 
class KeyEvent : public SdlEvent
{
public:
        using SdlEvent::SdlEvent;
 
        [[nodiscard]] bool         getRepeat()    const { return evt.key.repeat; }
        [[nodiscard]] SDL_Keycode  getKeyCode()   const { return evt.key.keysym.sym; }
        [[nodiscard]] SDL_Scancode getScanCode()  const { return evt.key.keysym.scancode; }
        [[nodiscard]] uint16_t     getModifiers() const { return evt.key.keysym.mod; }
        [[nodiscard]] uint32_t     getUnicode()   const {
                // HACK: repurposed 'unused' field as 'unicode' field
                return evt.key.keysym.unused;
        }
        [[nodiscard]] SDLKey getKey() const { return SDLKey{evt.key.keysym, evt.type == SDL_KEYDOWN}; }
};
 
class KeyUpEvent final : public KeyEvent
{
public:
        using KeyEvent::KeyEvent;
 
        [[nodiscard]] static KeyUpEvent create(SDL_Keycode code, SDL_Keymod mod = KMOD_NONE) {
                SDL_Event evt;
                evt.key = SDL_KeyboardEvent{};
                auto& e = evt.key;
 
                e.type = SDL_KEYUP;
                e.timestamp = SDL_GetTicks();
                e.state = SDL_RELEASED;
                e.keysym.sym = code;
                e.keysym.mod = mod;
                return KeyUpEvent(evt);
        }
};
 
class KeyDownEvent final : public KeyEvent
{
public:
        using KeyEvent::KeyEvent;
 
        [[nodiscard]] static KeyDownEvent create(SDL_Keycode code, SDL_Keymod mod = KMOD_NONE) {
                SDL_Event evt;
                evt.key = SDL_KeyboardEvent{};
                auto& e = evt.key;
 
                e.type = SDL_KEYDOWN;
                e.timestamp = SDL_GetTicks();
                e.state = SDL_PRESSED;
                e.keysym.sym = code;
                e.keysym.mod = mod;
                return KeyDownEvent(evt);
        }
        [[nodiscard]] static KeyDownEvent create(uint32_t timestamp, unsigned unicode) {
                SDL_Event evt;
                evt.key = SDL_KeyboardEvent{};
                auto& e = evt.key;
 
                e.type = SDL_KEYDOWN;
                e.timestamp = timestamp;
                e.state = SDL_PRESSED;
                e.keysym.sym = SDLK_UNKNOWN;
                e.keysym.mod = KMOD_NONE;
                e.keysym.unused = unicode;
                return KeyDownEvent(evt);
        }
};
 
 
class MouseButtonEvent : public SdlEvent
{
public:
        using SdlEvent::SdlEvent;
 
        [[nodiscard]] auto getButton() const { return evt.button.button; }
};
 
class MouseButtonUpEvent final : public MouseButtonEvent
{
public:
        using MouseButtonEvent::MouseButtonEvent;
};
 
class MouseButtonDownEvent final : public MouseButtonEvent
{
public:
        using MouseButtonEvent::MouseButtonEvent;
};
 
class MouseWheelEvent final : public SdlEvent
{
public:
        using SdlEvent::SdlEvent;
 
        [[nodiscard]] int getX() const { return normalize(evt.wheel.x); }
        [[nodiscard]] int getY() const { return normalize(evt.wheel.y); }
 
private:
        [[nodiscard]] int normalize(int x) const {
                return evt.wheel.direction == SDL_MOUSEWHEEL_FLIPPED ? -x : x;
        }
};
 
class MouseMotionEvent final : public SdlEvent
{
public:
        using SdlEvent::SdlEvent;
 
        [[nodiscard]] int getX() const    { return evt.motion.xrel; }
        [[nodiscard]] int getY() const    { return evt.motion.yrel; }
        [[nodiscard]] int getAbsX() const { return evt.motion.x; }
        [[nodiscard]] int getAbsY() const { return evt.motion.y; }
};
 
 
class JoystickEvent : public SdlEvent
{
public:
        using SdlEvent::SdlEvent;
 
        [[nodiscard]] JoystickId getJoystick() const {
                // SDL joystick instance ID has already been translated to an openMSX JoystickID
                return JoystickId(evt.jbutton.which);
        }
};
 
class JoystickButtonEvent : public JoystickEvent
{
public:
        using JoystickEvent::JoystickEvent;
 
        [[nodiscard]] unsigned getButton() const { return evt.jbutton.button; }
};
 
class JoystickButtonUpEvent final : public JoystickButtonEvent
{
public:
        using JoystickButtonEvent::JoystickButtonEvent;
};
 
class JoystickButtonDownEvent final : public JoystickButtonEvent
{
public:
        using JoystickButtonEvent::JoystickButtonEvent;
};
 
class JoystickAxisMotionEvent final : public JoystickEvent
{
public:
        static constexpr uint8_t X_AXIS = 0;
        static constexpr uint8_t Y_AXIS = 1;
 
        using JoystickEvent::JoystickEvent;
 
        [[nodiscard]] uint8_t getAxis() const { return evt.jaxis.axis; }
        [[nodiscard]] int16_t getValue() const { return evt.jaxis.value; }
};
 
class JoystickHatEvent final : public JoystickEvent
{
public:
        using JoystickEvent::JoystickEvent;
 
        [[nodiscard]] uint8_t getHat()   const { return evt.jhat.hat; }
        [[nodiscard]] uint8_t getValue() const { return evt.jhat.value; }
};
 
 
class WindowEvent : public SdlEvent
{
public:
        using SdlEvent::SdlEvent;
 
        [[nodiscard]] const SDL_WindowEvent& getSdlWindowEvent() const { return evt.window; }
        [[nodiscard]] bool isMainWindow() const { return isMainWindow(evt.window.windowID); }
 
public:
        static void setMainWindowId(uint32_t id) { mainWindowId = id; }
        static uint32_t getMainWindowId() { return mainWindowId; }
        [[nodiscard]] static bool isMainWindow(unsigned id) { return id == mainWindowId; }
private:
        static inline uint32_t mainWindowId = unsigned(-1);
};
 
 
class TextEvent : public SdlEvent
{
public:
        using SdlEvent::SdlEvent;
};
 
 
class FileDropEvent final : public EventBase
{
public:
        explicit FileDropEvent(std::string_view fileName_)
                : fileName(allocate_c_string(fileName_)) {}
        FileDropEvent(const FileDropEvent&) { assert(false); }
        FileDropEvent& operator=(const FileDropEvent&) { assert(false); return *this; }
        FileDropEvent(FileDropEvent&&) = default;
        FileDropEvent& operator=(FileDropEvent&&) = default;
        ~FileDropEvent() = default;
 
        [[nodiscard]] zstring_view getFileName() const { return fileName.get(); }
 
private:
        StringStorage fileName;
};
 
 
class QuitEvent final : public EventBase {};
 
 
class OsdControlEvent : public EventBase
{
public:
        enum { LEFT_BUTTON, RIGHT_BUTTON, UP_BUTTON, DOWN_BUTTON,
                A_BUTTON, B_BUTTON };
 
        [[nodiscard]] unsigned getButton() const { return button; }
 
protected:
        explicit OsdControlEvent(unsigned button_)
                : button(button_) {}
 
private:
        unsigned button;
};
 
class OsdControlReleaseEvent final : public OsdControlEvent
{
public:
        explicit OsdControlReleaseEvent(unsigned button_)
                : OsdControlEvent(button_) {}
};
 
class OsdControlPressEvent final : public OsdControlEvent
{
public:
        explicit OsdControlPressEvent(unsigned button_)
                : OsdControlEvent(button_) {}
};
 
 
class GroupEvent final : public EventBase
{
public:
        GroupEvent(std::initializer_list<EventType> typesToMatch_, TclObject tclListComponents_)
                : typesToMatch(typesToMatch_)
                , tclListComponents(std::move(tclListComponents_)) {}
 
        [[nodiscard]] const auto& getTypesToMatch() const { return typesToMatch; }
        [[nodiscard]] const auto& getTclListComponents() const { return tclListComponents; }
 
private:
        static_vector<EventType, 3> typesToMatch;
        TclObject tclListComponents;
};
 
class FinishFrameEvent final : public EventBase
{
public:
        FinishFrameEvent(int thisSource_, int selectedSource_,
                         bool skipped_)
                : thisSource(thisSource_), selectedSource(selectedSource_)
                , skipped(skipped_)
        {
        }
 
        [[nodiscard]] int getSource()         const { return thisSource; }
        [[nodiscard]] int getSelectedSource() const { return selectedSource; }
        [[nodiscard]] bool isSkipped() const { return skipped; }
        [[nodiscard]] bool needRender() const { return !skipped && (thisSource == selectedSource); }
 
private:
        int thisSource;
        int selectedSource;
        bool skipped;
};
 
class CliCommandEvent final : public EventBase
{
public:
        CliCommandEvent(std::string_view command_, const CliConnection* id_)
                : command(allocate_c_string(command_)), id(id_) {}
        CliCommandEvent(const CliCommandEvent&) { assert(false); }
        CliCommandEvent& operator=(const CliCommandEvent&) { assert(false); return *this; }
        CliCommandEvent(CliCommandEvent&&) = default;
        CliCommandEvent& operator=(CliCommandEvent&&) = default;
        ~CliCommandEvent() = default;
 
        [[nodiscard]] zstring_view getCommand() const { return command.get(); }
        [[nodiscard]] const CliConnection* getId() const { return id; }
 
private:
        StringStorage command;
        const CliConnection* id;
};
 
class ImGuiActiveEvent final : public EventBase
{
public:
        explicit ImGuiActiveEvent(bool active_)
                : active(active_) {}
        [[nodiscard]] bool getActive() const { return active; }
 
private:
        bool active;
};
 
 
// Events that don't need additional data
class SimpleEvent : public EventBase {};
 
class BootEvent                  final : public SimpleEvent {};
 
class FrameDrawnEvent            final : public SimpleEvent {};
 
class BreakEvent                 final : public SimpleEvent {};
class SwitchRendererEvent        final : public SimpleEvent {};
 
class TakeReverseSnapshotEvent   final : public SimpleEvent {};
 
class AfterTimedEvent            final : public SimpleEvent {};
 
class MachineLoadedEvent         final : public SimpleEvent {};
 
class MachineActivatedEvent      final : public SimpleEvent {};
class MachineDeactivatedEvent    final : public SimpleEvent {};
 
class MidiInReaderEvent          final : public SimpleEvent {};
class MidiInWindowsEvent         final : public SimpleEvent {};
class MidiInCoreMidiEvent        final : public SimpleEvent {};
class MidiInCoreMidiVirtualEvent final : public SimpleEvent {};
class MidiInALSAEvent            final : public SimpleEvent {};
class Rs232TesterEvent           final : public SimpleEvent {};
class Rs232NetEvent              final : public SimpleEvent {};
class ImGuiDelayedActionEvent    final : public SimpleEvent {};
 
 
// --- Put all (non-abstract) Event classes into a std::variant ---
 
using Event = std::variant<
        KeyUpEvent,
        KeyDownEvent,
        MouseMotionEvent,
        MouseButtonUpEvent,
        MouseButtonDownEvent,
        MouseWheelEvent,
        JoystickAxisMotionEvent,
        JoystickHatEvent,
        JoystickButtonUpEvent,
        JoystickButtonDownEvent,
        OsdControlReleaseEvent,
        OsdControlPressEvent,
        WindowEvent,
        TextEvent,
        FileDropEvent,
        QuitEvent,
        FinishFrameEvent,
        CliCommandEvent,
        GroupEvent,
        BootEvent,
        FrameDrawnEvent,
        BreakEvent,
        SwitchRendererEvent,
        TakeReverseSnapshotEvent,
        AfterTimedEvent,
        MachineLoadedEvent,
        MachineActivatedEvent,
        MachineDeactivatedEvent,
        MidiInReaderEvent,
        MidiInWindowsEvent,
        MidiInCoreMidiEvent,
        MidiInCoreMidiVirtualEvent,
        MidiInALSAEvent,
        Rs232TesterEvent,
        Rs232NetEvent,
        ImGuiDelayedActionEvent,
        ImGuiActiveEvent
>;
 
template<typename T>
inline constexpr uint8_t event_index = get_index<T, Event>::value;
 
 
// --- Define an enum for all concrete event types. ---
// Use the numeric value from the corresponding index in the Event.
enum class EventType : uint8_t
{
        KEY_UP                   = event_index<KeyUpEvent>,
        KEY_DOWN                 = event_index<KeyDownEvent>,
        MOUSE_MOTION             = event_index<MouseMotionEvent>,
        MOUSE_BUTTON_UP          = event_index<MouseButtonUpEvent>,
        MOUSE_BUTTON_DOWN        = event_index<MouseButtonDownEvent>,
        MOUSE_WHEEL              = event_index<MouseWheelEvent>,
        JOY_AXIS_MOTION          = event_index<JoystickAxisMotionEvent>,
        JOY_HAT                  = event_index<JoystickHatEvent>,
        JOY_BUTTON_UP            = event_index<JoystickButtonUpEvent>,
        JOY_BUTTON_DOWN          = event_index<JoystickButtonDownEvent>,
        OSD_CONTROL_RELEASE      = event_index<OsdControlReleaseEvent>,
        OSD_CONTROL_PRESS        = event_index<OsdControlPressEvent>,
        WINDOW                   = event_index<WindowEvent>,
        TEXT                     = event_index<TextEvent>,
        FILE_DROP                = event_index<FileDropEvent>,
        QUIT                     = event_index<QuitEvent>,
        GROUP                    = event_index<GroupEvent>,
        BOOT                     = event_index<BootEvent>,
        FINISH_FRAME             = event_index<FinishFrameEvent>,
        FRAME_DRAWN              = event_index<FrameDrawnEvent>,
        BREAK                    = event_index<BreakEvent>,
        SWITCH_RENDERER          = event_index<SwitchRendererEvent>,
        TAKE_REVERSE_SNAPSHOT    = event_index<TakeReverseSnapshotEvent>,
        CLICOMMAND               = event_index<CliCommandEvent>,
        AFTER_TIMED              = event_index<AfterTimedEvent>,
        MACHINE_LOADED           = event_index<MachineLoadedEvent>,
        MACHINE_ACTIVATED        = event_index<MachineActivatedEvent>,
        MACHINE_DEACTIVATED      = event_index<MachineDeactivatedEvent>,
        MIDI_IN_READER           = event_index<MidiInReaderEvent>,
        MIDI_IN_WINDOWS          = event_index<MidiInWindowsEvent>,
        MIDI_IN_COREMIDI         = event_index<MidiInCoreMidiEvent>,
        MIDI_IN_COREMIDI_VIRTUAL = event_index<MidiInCoreMidiVirtualEvent>,
        MIDI_IN_ALSA             = event_index<MidiInALSAEvent>,
        RS232_TESTER             = event_index<Rs232TesterEvent>,
        RS232_NET                = event_index<Rs232NetEvent>,
        IMGUI_DELAYED_ACTION     = event_index<ImGuiDelayedActionEvent>,
        IMGUI_ACTIVE             = event_index<ImGuiActiveEvent>,
 
        NUM_EVENT_TYPES // must be last
};
 
 
// --- Event class, free functions ---
 
[[nodiscard]] EventType getType(const Event& event);
 
[[nodiscard]] std::string toString(const Event& event);
 
[[nodiscard]] TclObject toTclList(const Event& event);
 
[[nodiscard]] bool operator==(const Event& x, const Event& y);
 
[[nodiscard]] bool matches(const Event& self, const Event& other);
 
 
// --- Event class implementation, free functions ---
 
inline EventType getType(const Event& event)
{
        return EventType(event.index());
}
 
// Similar to std::get() and std::get_if()
template<typename T>
struct GetIfEventHelper { // standard std::get_if() behavior
        const T* operator()(const Event& event) {
                return std::get_if<T>(&event);
        }
};
template<>
struct GetIfEventHelper<SdlEvent> { // extension for base-classes
        [[nodiscard]] const SdlEvent* operator()(const Event& event) const {
                const auto& var = event;
                switch (EventType(var.index())) {
                using enum EventType;
                case KEY_UP:            return &std::get<KeyUpEvent>(var);
                case KEY_DOWN:          return &std::get<KeyDownEvent>(var);
                case MOUSE_BUTTON_UP:   return &std::get<MouseButtonUpEvent>(var);
                case MOUSE_BUTTON_DOWN: return &std::get<MouseButtonDownEvent>(var);
                case MOUSE_WHEEL:       return &std::get<MouseWheelEvent>(var);
                case MOUSE_MOTION:      return &std::get<MouseMotionEvent>(var);
                case JOY_BUTTON_UP:     return &std::get<JoystickButtonUpEvent>(var);
                case JOY_BUTTON_DOWN:   return &std::get<JoystickButtonDownEvent>(var);
                case JOY_AXIS_MOTION:   return &std::get<JoystickAxisMotionEvent>(var);
                case JOY_HAT:           return &std::get<JoystickHatEvent>(var);
                case WINDOW:            return &std::get<WindowEvent>(var);
                case TEXT:              return &std::get<TextEvent>(var);
                default: return nullptr;
                }
        }
};
template<>
struct GetIfEventHelper<KeyEvent> {
        [[nodiscard]] const KeyEvent* operator()(const Event& event) const {
                const auto& var = event;
                switch (EventType(var.index())) {
                using enum EventType;
                case KEY_UP:   return &std::get<KeyUpEvent>(var);
                case KEY_DOWN: return &std::get<KeyDownEvent>(var);
                default: return nullptr;
                }
        }
};
template<>
struct GetIfEventHelper<JoystickEvent> {
        [[nodiscard]] const JoystickEvent* operator()(const Event& event) const {
                const auto& var = event;
                switch (EventType(var.index())) {
                using enum EventType;
                case JOY_BUTTON_UP:   return &std::get<JoystickButtonUpEvent>(var);
                case JOY_BUTTON_DOWN: return &std::get<JoystickButtonDownEvent>(var);
                case JOY_AXIS_MOTION: return &std::get<JoystickAxisMotionEvent>(var);
                case JOY_HAT:         return &std::get<JoystickHatEvent>(var);
                default: return nullptr;
                }
        }
};
template<typename T>
const T* get_event_if(const Event& event)
{
        GetIfEventHelper<T> helper;
        return helper(event);
}
template<typename T>
const T& get_event(const Event& event)
{
        const T* t = get_event_if<T>(event);
        assert(t);
        return *t;
}
 
} // namespace openmsx
 
#endif