76 lines
2.1 KiB
C++
76 lines
2.1 KiB
C++
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/*
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* Libpdraw: A Versitile GUI for use with a primitive drawing system!
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* Copyright (C) 2022 Rebekah Rowe
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#pragma once
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// an extended std lib
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#include <algorithm>
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#include <vector>
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namespace cat {
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// To handle calling of events
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template <typename... args>
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class Event {
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public:
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using FuncPtr = void (*)(args...);
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private:
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std::vector<FuncPtr> func_pool;
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bool in_event = false;
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auto find(FuncPtr in) {
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return std::find(this->func_pool.begin(), this->func_pool.end(), in);
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}
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public:
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inline bool GetInEvent() { return in_event; }
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inline void Emit(args... a) {
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in_event = true;
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for (const auto& func : this->func_pool)
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func(a...);
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in_event = false;
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}
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void Listen(FuncPtr in) {
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auto find = this->find(in);
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if (find != this->func_pool.end())
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throw "Listener already exists";
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this->func_pool.push_back(in);
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}
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void Remove(FuncPtr in) {
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auto find = this->find(in);
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if (find != this->func_pool.end())
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this->func_pool.erase(find);
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else
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throw "Listener doesnt exist";
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}
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};
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// Managed listener, adds on construct and removes on destruct
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/*template<class Event>
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class Listener {
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Listener(Event::FuncPtr _callback) : callback(_callback) {
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Event.Listen(_callback);
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}
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~Listener() { Event.Remove(callback); }
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const Event::FuncPtr callback;
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};*/
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} // namespace cat
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