RmlUi/Source/Lua/Elements/As.h

/*
 * This source file is part of RmlUi, the HTML/CSS Interface Middleware
 *
 * For the latest information, see http://github.com/mikke89/RmlUi
 *
 * Copyright (c) 2008-2010 CodePoint Ltd, Shift Technology Ltd
 * Copyright (c) 2019-2023 The RmlUi Team, and contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 */

#ifndef RMLUI_LUA_ELEMENTS_AS_H
#define RMLUI_LUA_ELEMENTS_AS_H
/*
    These are helper functions to fill up the Element.As table with types that are able to be casted
*/

#include <RmlUi/Core/Element.h>
#include <RmlUi/Lua/IncludeLua.h>
#include <RmlUi/Lua/LuaType.h>

namespace Rml {
namespace Lua {

// Helper function for the controls, so that the types don't have to define individual functions themselves
//  to fill the Elements.As table
template <typename ToType>
int CastFromElementTo(lua_State* L)
{
	Element* ele = LuaType<Element>::check(L, 1);
	RMLUI_CHECK_OBJ(ele);
	LuaType<ToType>::push(L, (ToType*)ele, false);
	return 1;
}

// Adds to the Element.As table the name of the type, and the function to use to cast
template <typename T>
void AddCastFunctionToElementAsTable(lua_State* L)
{
	int top = lua_gettop(L);
	lua_getglobal(L, "Element");
	lua_getfield(L, -1, "As");
	if (!lua_isnoneornil(L, -1))
	{
		lua_pushcfunction(L, CastFromElementTo<T>);
		lua_setfield(L, -2, GetTClassName<T>());
	}
	lua_settop(L, top); // pop "As" and "Element"
}

} // namespace Lua
} // namespace Rml
#endif