SignalManager.hpp

 
//
// TGUI - Texus' Graphical User Interface
// Copyright (C) 2012-2022 Bruno Van de Velde (vdv_b@tgui.eu)
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it freely,
// subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented;
// you must not claim that you wrote the original software.
// If you use this software in a product, an acknowledgment
// in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such,
// and must not be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
 
 
#ifndef TGUI_SIGNAL_MANAGER_HPP
#define TGUI_SIGNAL_MANAGER_HPP
 
 
#include <TGUI/Widget.hpp>
#include <unordered_map>
#include <memory>
 
 
namespace tgui
{
 
 class TGUI_API SignalManager
 {
 public:
 
 using Ptr = std::shared_ptr<SignalManager>; 
 using ConstPtr = std::shared_ptr<const SignalManager>; 
 
 using Delegate = std::function<void()>;
 using DelegateEx = std::function<void(std::shared_ptr<Widget>, const String&)>;
 
 using Weak = std::weak_ptr<Widget>;
 using SignalID = unsigned int;
 
 struct SignalTuple
 {
 String widgetName;
 String signalName;
 std::pair<Delegate, DelegateEx> func;
 };
 
 struct ConnectedSignalTuple
 {
 SignalID signalId;
 Weak widget;
 unsigned int signalWidgetID;
 
 ConnectedSignalTuple(SignalID sigId, Weak widgetPtr, unsigned int widgetId) :
 signalId(sigId),
 widget(std::move(widgetPtr)),
 signalWidgetID(widgetId)
 {
 }
 };
 
 SignalManager() = default;
 
 virtual ~SignalManager() = default;
 
 static void setDefaultSignalManager(const SignalManager::Ptr& manager);
 
 static SignalManager::Ptr getSignalManager();
 
#if defined(__cpp_if_constexpr) && (__cpp_if_constexpr >= 201606L)
 template <typename Func, typename... BoundArgs>
 unsigned int connect(String widgetName, String signalName, Func&& handler, const BoundArgs&... args);
 
#else
 template <typename Func, typename... Args, typename std::enable_if<std::is_convertible<Func, std::function<void(const Args&...)>>::value>::type* = nullptr>
 unsigned int connect(String widgetName, String signalName, Func&& handler, const Args&... args);
 
 
 template <typename Func, typename... BoundArgs, typename std::enable_if<!std::is_convertible<Func, std::function<void(const BoundArgs&...)>>::value // Ambigious otherwise when passing bind expression
 && std::is_convertible<Func, std::function<void(const BoundArgs&..., std::shared_ptr<Widget>, const String&)>>::value>::type* = nullptr>
 unsigned int connect(String widgetName, String signalName, Func&& handler, BoundArgs&&... args);
#endif
 
 virtual bool disconnect(unsigned int id);
 
 
 virtual void disconnectAll();
 
 
 virtual void add(const Widget::Ptr& widgetPtr);
 
 
 virtual void remove(Widget* widget);
 
 private:
 unsigned int generateUniqueId();
 
 unsigned int m_lastId = 0;
 
 
 protected:
 
 std::pair<Delegate, DelegateEx> makeSignal(const Delegate&);
 
 
 std::pair<Delegate, DelegateEx> makeSignalEx(const DelegateEx&);
 
 
 virtual void connect(SignalID id);
 
 
 
 static SignalManager::Ptr m_manager;
 
 std::vector<Weak> m_widgets;
 std::unordered_map<SignalID, SignalTuple> m_signals;
 std::vector<ConnectedSignalTuple> m_connectedSignals;
 };
 
 
#if defined(__cpp_if_constexpr) && (__cpp_if_constexpr >= 201606L)
 template <typename Func, typename... BoundArgs>
 unsigned int SignalManager::connect(String widgetName, String signalName, Func&& handler, const BoundArgs&... args)
 {
 const unsigned int id = generateUniqueId();
 
 if constexpr (std::is_convertible_v<Func, std::function<void(const BoundArgs&...)>>
 && std::is_invocable_v<decltype(&handler), BoundArgs...>
 && !std::is_function_v<Func>)
 {
 // Reference to function
 m_signals[id] = {widgetName, signalName, makeSignal([=, f=std::function<void(const BoundArgs&...)>(handler)]{ std::invoke(f, args...); })};
 }
 else if constexpr (std::is_convertible_v<Func, std::function<void(const BoundArgs&...)>>)
 {
 // Function pointer
 m_signals[id] = {widgetName, signalName, makeSignal([=]{ std::invoke(handler, args...); })};
 }
 else if constexpr (std::is_convertible_v<Func, std::function<void(const BoundArgs&..., const std::shared_ptr<Widget>&, const String&)>>
 && std::is_invocable_v<decltype(&handler), BoundArgs..., const std::shared_ptr<Widget>&, const String&>
 && !std::is_function_v<Func>)
 {
 // Reference to function with caller arguments
 m_signals[id] = {widgetName, signalName, makeSignalEx([=, f=std::function<void(const BoundArgs&..., const std::shared_ptr<Widget>& w, const String& s)>(handler)](const std::shared_ptr<Widget>& w, const String& s){ std::invoke(f, args..., w, s); })};
 }
 else
 {
 // Function pointer with caller arguments
 m_signals[id] = {widgetName, signalName, makeSignalEx([=](const std::shared_ptr<Widget>& w, const String& s){ std::invoke(handler, args..., w, s); })};
 }
 
 connect(id);
 return id;
 }
#else
 template <typename Func, typename... Args, typename std::enable_if<std::is_convertible<Func, std::function<void(const Args&...)>>::value>::type*>
 unsigned int SignalManager::connect(String widgetName, String signalName, Func&& handler, const Args&... args)
 {
 const unsigned int id = generateUniqueId();
 m_signals[id] = {widgetName, signalName, makeSignal([f=std::function<void(const Args&...)>(handler),args...](){ f(args...); })};
 
 connect(id);
 return id;
 }
 
 template <typename Func, typename... BoundArgs, typename std::enable_if<!std::is_convertible<Func, std::function<void(const BoundArgs&...)>>::value // Ambigious otherwise when passing bind expression
 && std::is_convertible<Func, std::function<void(const BoundArgs&..., std::shared_ptr<Widget>, const String&)>>::value>::type*>
 unsigned int SignalManager::connect(String widgetName, String signalName, Func&& handler, BoundArgs&&... args)
 {
 const unsigned int id = generateUniqueId();
 m_signals[id] = {widgetName, signalName, makeSignalEx(
 [f=std::function<void(const BoundArgs&..., const std::shared_ptr<Widget>&, const String&)>(handler), args...]
 (const std::shared_ptr<Widget>& w, const String& s)
 { f(args..., w, s); }
 )};
 
 connect(id);
 return id;
 }
#endif
 
}
 
 
#endif // TGUI_SIGNAL_MANAGER_HPP