113 lines
3.8 KiB
C++
113 lines
3.8 KiB
C++
////////////////////////////////////////////////////////////
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//
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// SFML - Simple and Fast Multimedia Library
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// Copyright (C) 2007-2025 Laurent Gomila (laurent@sfml-dev.org)
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//
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// This software is provided 'as-is', without any express or implied warranty.
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// In no event will the authors be held liable for any damages arising from the use of this software.
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//
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// Permission is granted to anyone to use this software for any purpose,
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// including commercial applications, and to alter it and redistribute it freely,
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// subject to the following restrictions:
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//
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// 1. The origin of this software must not be misrepresented;
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// you must not claim that you wrote the original software.
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// If you use this software in a product, an acknowledgment
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// in the product documentation would be appreciated but is not required.
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//
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// 2. Altered source versions must be plainly marked as such,
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// and must not be misrepresented as being the original software.
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//
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// 3. This notice may not be removed or altered from any source distribution.
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//
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////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////
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// Headers
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////////////////////////////////////////////////////////////
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#include <SFML/Window/Event.hpp>
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#include <SFML/Window/WindowBase.hpp> // NOLINT(misc-header-include-cycle)
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#include <type_traits>
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#include <utility>
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namespace sf
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{
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namespace priv
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{
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template <typename... Ts>
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struct OverloadSet : Ts...
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{
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using Ts::operator()...;
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#if defined(_MSC_VER) && !defined(__clang__)
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unsigned char dummy; // Dummy variable to ensure that this struct is not empty thus avoiding a crash due to an MSVC bug
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#endif
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};
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template <typename... Ts>
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OverloadSet(Ts...) -> OverloadSet<Ts...>;
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struct DelayOverloadResolution
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{
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template <typename T>
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DelayOverloadResolution(const T&)
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{
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}
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};
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// Wrapper providing a callable type suitable as OverloadSet base type for different kinds of handlers.
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// By default, we derive from the handler type and inherit its call operators.
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template <typename Handler>
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struct Caller : Handler
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{
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using Handler::operator();
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};
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// Inheritance is not possible with reference types.
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// In this case, we capture the reference and forward arguments to it.
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template <typename Handler>
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struct Caller<Handler&>
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{
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// Use SFINAE so that the call operator exists only for arguments the captured handler accepts
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template <typename Argument, std::enable_if_t<std::is_invocable_v<Handler&, Argument>, int> = 0>
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decltype(auto) operator()(Argument&& argument)
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{
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return handler(std::forward<Argument>(argument));
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}
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Handler& handler;
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};
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// Inheritance is not possible with function pointers either.
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// In this case, we capture the function pointer to call it.
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template <typename Return, typename Argument>
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struct Caller<Return (*)(Argument)>
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{
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Return operator()(Argument&& argument)
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{
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return function(std::forward<Argument>(argument));
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}
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Return (*function)(Argument);
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};
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} // namespace priv
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////////////////////////////////////////////////////////////
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template <typename... Handlers>
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void WindowBase::handleEvents(Handlers&&... handlers)
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{
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static_assert(sizeof...(Handlers) > 0, "Must provide at least one handler");
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static_assert((Event::isEventHandler<Handlers> && ...), "Handlers must accept at least one subtype of sf::Event");
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// Disable misc-const-correctness for this line since clang-tidy
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// complains about it even though the code would become incorrect
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// NOLINTNEXTLINE(misc-const-correctness)
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priv::OverloadSet overloadSet{priv::Caller<Handlers>{std::forward<Handlers>(handlers)}...,
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[](const priv::DelayOverloadResolution&) { /* ignore */ }};
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while (const std::optional event = pollEvent())
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event->visit(overloadSet);
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}
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} // namespace sf
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