src/lua/math/lua_input.cpp

#ifdef WITH_RIVE_SCRIPTING
#include "rive/lua/rive_lua_libs.hpp"
#include "lualib.h"

using namespace rive;

static const char* hit_listener_type_string(int raw)
{
    switch (static_cast<ListenerType>(raw))
    {
        case ListenerType::enter:
            return "pointerEnter";
        case ListenerType::exit:
            return "pointerExit";
        case ListenerType::down:
            return "pointerDown";
        case ListenerType::up:
            return "pointerUp";
        case ListenerType::move:
            return "pointerMove";
        case ListenerType::click:
            return "click";
        case ListenerType::drag:
            return "pointerDrag";
        default:
            return "unknown";
    }
    return "unknown";
}

static void pointer_event_direct_id(void* udata, void* result)
{
    lua_userdatadirectfield_setnumber(
        result,
        (double)((ScriptedPointerEvent*)udata)->m_id);
}

static void pointer_event_direct_position(void* udata, void* result)
{
    auto* self = (ScriptedPointerEvent*)udata;
    lua_userdatadirectfield_setvector(result,
                                      self->m_position.x,
                                      self->m_position.y,
                                      0.0f
#if LUA_VECTOR_SIZE == 4
                                      ,
                                      0.0f
#endif
    );
}

static void pointer_event_direct_previousPosition(void* udata, void* result)
{
    auto* self = (ScriptedPointerEvent*)udata;
    lua_userdatadirectfield_setvector(result,
                                      self->m_previousPosition.x,
                                      self->m_previousPosition.y,
                                      0.0f
#if LUA_VECTOR_SIZE == 4
                                      ,
                                      0.0f
#endif
    );
}

static void pointer_event_direct_timeStamp(void* udata, void* result)
{
    lua_userdatadirectfield_setnumber(
        result,
        ((ScriptedPointerEvent*)udata)->m_timeStamp);
}

static int pointer_event_index(lua_State* L)
{
    int atom;
    const char* key = lua_tostringatom(L, 2, &atom);
    if (!key)
    {
        luaL_typeerrorL(L, 2, lua_typename(L, LUA_TSTRING));
        return 0;
    }

    auto pointerEvent = lua_torive<ScriptedPointerEvent>(L, 1);
    switch (atom)
    {
        case (int)LuaAtoms::id:
            lua_pushunsigned(L, (unsigned)pointerEvent->m_id);
            return 1;
        case (int)LuaAtoms::position:
            lua_pushvector2(L,
                            pointerEvent->m_position.x,
                            pointerEvent->m_position.y);
            return 1;
        case (int)LuaAtoms::previousPosition:
            lua_pushvector2(L,
                            pointerEvent->m_previousPosition.x,
                            pointerEvent->m_previousPosition.y);
            return 1;
        case (int)LuaAtoms::type:
            lua_pushstring(
                L,
                hit_listener_type_string(pointerEvent->m_hitListenerType));
            return 1;
        case (int)LuaAtoms::timeStamp:
            lua_pushnumber(L, pointerEvent->m_timeStamp);
            return 1;
    }

    luaL_error(L,
               "%s is not a valid field of %s",
               luaL_checkstring(L, 1),
               ScriptedPointerEvent::luaName);
    return 0;
}

static int pointer_event_hit(lua_State* L)
{
    auto pointerEvent = lua_torive<ScriptedPointerEvent>(L, 1);
    if (lua_isboolean(L, 2))
    {
        pointerEvent->m_hitResult =
            lua_toboolean(L, 2) ? HitResult::hit : HitResult::hitOpaque;
    }
    else
    {
        pointerEvent->m_hitResult = HitResult::hitOpaque;
    }
    return 0;
}

static int pointer_event_namecall(lua_State* L)
{
    int atom;
    const char* str = lua_namecallatom(L, &atom);
    if (str != nullptr)
    {
        switch (atom)
        {
            case (int)LuaAtoms::hit:
                return pointer_event_hit(L);
        }
    }

    luaL_error(L,
               "%s is not a valid method of %s",
               luaL_checkstring(L, 1),
               ScriptedPointerEvent::luaName);
    return 0;
}

static int pointer_event_new(lua_State* L)
{

    int id = luaL_checkinteger(L, 1);
    auto vec = lua_checkvec2d(L, 2);
    lua_newrive<ScriptedPointerEvent>(L, id, Vec2D(vec->x, vec->y));
    return 1;
}

static const luaL_Reg pointerEventsStaticMethods[] = {
    {"new", pointer_event_new},
    {nullptr, nullptr}};

int luaopen_rive_input(lua_State* L)
{
    {
        luaL_register(L,
                      ScriptedPointerEvent::luaName,
                      pointerEventsStaticMethods);
    }
    {
        lua_register_rive<ScriptedPointerEvent>(L);
        lua_pushcfunction(L, pointer_event_index, nullptr);
        lua_setfield(L, -2, "__index");
        lua_pushcfunction(L, pointer_event_namecall, nullptr);
        lua_setfield(L, -2, "__namecall");

        lua_setreadonly(L, -1, true);
        lua_pop(L, 1); // pop the metatable

        lua_registeruserdatadirectfieldget(L,
                                           ScriptedPointerEvent::luaTag,
                                           "id",
                                           pointer_event_direct_id);
        lua_registeruserdatadirectfieldget(L,
                                           ScriptedPointerEvent::luaTag,
                                           "position",
                                           pointer_event_direct_position);
        lua_registeruserdatadirectfieldget(
            L,
            ScriptedPointerEvent::luaTag,
            "previousPosition",
            pointer_event_direct_previousPosition);
        lua_registeruserdatadirectfieldget(L,
                                           ScriptedPointerEvent::luaTag,
                                           "timeStamp",
                                           pointer_event_direct_timeStamp);
    }

    rive_lua_register_listener_invocation_types(L);

    return 1;
}

#endif