Signal.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_HPP
#define TGUI_SIGNAL_HPP
 
 
#include <TGUI/Global.hpp>
#include <TGUI/String.hpp>
#include <TGUI/Color.hpp>
#include <TGUI/Vector2.hpp>
#include <TGUI/Animation.hpp>
#include <TGUI/Filesystem.hpp>
#include <unordered_map>
#include <type_traits>
#include <functional>
#include <typeindex>
#include <memory>
#include <vector>
#include <deque>
 
#undef MessageBox // windows.h defines MessageBox when NOMB isn't defined before including windows.h
 
 
namespace tgui
{
 class Widget;
 class ChildWindow;
 
 class TGUI_API Signal
 {
 public:
 
 virtual ~Signal() = default;
 
 
 Signal(String&& name, std::size_t extraParameters = 0) :
 m_name{std::move(name)}
 {
 if (1 + extraParameters > m_parameters.size())
 m_parameters.resize(1 + extraParameters);
 }
 
 
 Signal(const Signal& other);
 
 
 Signal(Signal&& other) noexcept = default;
 
 
 Signal& operator=(const Signal& other);
 
 
 Signal& operator=(Signal&& other) noexcept = default;
 
 
 template <typename Func, typename... BoundArgs>
 unsigned int operator()(const Func& func, const BoundArgs&... args)
 {
 return connect(func, args...);
 }
 
 
 template <typename Func, typename... BoundArgs, typename std::enable_if_t<std::is_convertible<Func, std::function<void(const BoundArgs&...)>>::value>* = nullptr>
 unsigned int connect(const Func& func, const BoundArgs&... args)
 {
 const auto id = ++m_lastSignalId;
#if defined(__cpp_if_constexpr) && (__cpp_if_constexpr >= 201606L)
 if constexpr(sizeof...(BoundArgs) == 0)
 m_handlers[id] = func;
 else
#endif
 {
 m_handlers[id] = [=]{ invokeFunc(func, args...); };
 }
 
 return id;
 }
 
 
 template <typename Func, typename... BoundArgs, typename std::enable_if_t<std::is_convertible<Func, std::function<void(const BoundArgs&..., std::shared_ptr<Widget>, const String&)>>::value>* = nullptr>
 unsigned int connectEx(const Func& func, const BoundArgs&... args)
 {
 // The name is copied so that the lambda does not depend on the 'this' pointer
 return connect([func, name=m_name, args...](){ invokeFunc(func, args..., getWidget(), name); });
 }
 
 
 bool disconnect(unsigned int id);
 
 
 void disconnectAll();
 
 
 bool emit(const Widget* widget);
 
 
 String getName() const
 {
 return m_name;
 }
 
 
 void setEnabled(bool enabled)
 {
 m_enabled = enabled;
 }
 
 
 bool isEnabled() const
 {
 return m_enabled;
 }
 
 
 protected:
 
 static std::shared_ptr<Widget> getWidget();
 
 
 template <typename Type>
 static const std::decay_t<Type>& dereferenceParam(std::size_t paramIndex)
 {
 return *static_cast<const std::decay_t<Type>*>(m_parameters[paramIndex]);
 }
 
 
#if defined(__cpp_lib_invoke) && (__cpp_lib_invoke >= 201411L)
 template <typename Func, typename... Args>
 static void invokeFunc(Func&& func, Args&&... args)
 {
 std::invoke(std::forward<Func>(func), std::forward<Args>(args)...);
 }
#else
 // std::invoke only exists in c++17 so we use our own implementation to support c++14 compilers
 template <typename Func, typename... Args, typename std::enable_if<std::is_member_pointer<std::decay_t<Func>>::value>::type* = nullptr>
 static void invokeFunc(Func&& func, Args&&... args)
 {
 (std::mem_fn(func))(std::forward<Args>(args)...);
 }
 
 template <typename Func, typename... Args, typename std::enable_if<!std::is_member_pointer<std::decay_t<Func>>::value>::type* = nullptr>
 static void invokeFunc(Func&& func, Args&&... args)
 {
 std::forward<Func>(func)(std::forward<Args>(args)...);
 }
#endif
 
 
 protected:
 
 bool m_enabled = true;
 String m_name;
 std::unordered_map<unsigned int, std::function<void()>> m_handlers;
 
 static unsigned int m_lastSignalId;
 static std::deque<const void*> m_parameters;
 };
 
 
 template <typename T>
 class SignalTyped : public Signal
 {
 public:
 
 SignalTyped(String&& name) :
 Signal{std::move(name), 1}
 {
 }
 
 
 template <typename Func, typename... BoundArgs>
 unsigned int operator()(const Func& func, const BoundArgs&... args)
 {
 return connect(func, args...);
 }
 
 
 template <typename Func, typename... BoundArgs, typename std::enable_if_t<std::is_convertible<Func, std::function<void(const BoundArgs&...)>>::value>* = nullptr>
 unsigned int connect(const Func& func, const BoundArgs&... args)
 {
 return Signal::connect(func, args...);
 }
 
 
 template <typename Func, typename... BoundArgs, typename std::enable_if_t<std::is_convertible<Func, std::function<void(const BoundArgs&..., T)>>::value>* = nullptr>
 unsigned int connect(const Func& func, const BoundArgs&... args)
 {
 return Signal::connect([=]{ invokeFunc(func, args..., dereferenceParam<T>(1)); });
 }
 
 
 bool emit(const Widget* widget, T param)
 {
 if (m_handlers.empty())
 return false;
 
 m_parameters[1] = static_cast<const void*>(&param);
 return Signal::emit(widget);
 }
 };
 
 
 template <typename T1, typename T2>
 class SignalTyped2 : public Signal
 {
 public:
 
 SignalTyped2(String&& name) :
 Signal{std::move(name), 2}
 {
 }
 
 
 template <typename Func, typename... BoundArgs>
 unsigned int operator()(const Func& func, const BoundArgs&... args)
 {
 return connect(func, args...);
 }
 
 
 template <typename Func, typename... BoundArgs, typename std::enable_if_t<std::is_convertible<Func, std::function<void(const BoundArgs&...)>>::value>* = nullptr>
 unsigned int connect(const Func& func, const BoundArgs&... args)
 {
 return Signal::connect(func, args...);
 }
 
 
 template <typename Func, typename... BoundArgs, typename std::enable_if_t<std::is_convertible<Func, std::function<void(const BoundArgs&..., T1, T2)>>::value>* = nullptr>
 unsigned int connect(const Func& func, const BoundArgs&... args)
 {
 return Signal::connect([=]{ invokeFunc(func, args..., dereferenceParam<T1>(1), dereferenceParam<T2>(2)); });
 }
 
 
 bool emit(const Widget* widget, T1 param1, T2 param2)
 {
 if (m_handlers.empty())
 return false;
 
 m_parameters[1] = static_cast<const void*>(&param1);
 m_parameters[2] = static_cast<const void*>(&param2);
 return Signal::emit(widget);
 }
 };
 
 using SignalInt = SignalTyped<int>; 
 using SignalUInt = SignalTyped<unsigned int>; 
 using SignalBool = SignalTyped<bool>; 
 using SignalFloat = SignalTyped<float>; 
 using SignalColor = SignalTyped<Color>; 
 using SignalString = SignalTyped<const String&>; 
 using SignalVector2f = SignalTyped<Vector2f>; 
 using SignalFloatRect = SignalTyped<FloatRect>; 
 using SignalRange = SignalTyped2<float, float>; 
 
 
 class TGUI_API SignalChildWindow : public Signal
 {
 public:
 
 SignalChildWindow(String&& name) :
 Signal{std::move(name), 1}
 {
 }
 
 
 template <typename Func, typename... BoundArgs>
 unsigned int operator()(const Func& func, const BoundArgs&... args)
 {
 return connect(func, args...);
 }
 
 
 template <typename Func, typename... BoundArgs, typename std::enable_if_t<std::is_convertible<Func, std::function<void(const BoundArgs&...)>>::value>* = nullptr>
 unsigned int connect(const Func& func, const BoundArgs&... args)
 {
 return Signal::connect(func, args...);
 }
 
 
 template <typename Func, typename... BoundArgs, typename std::enable_if_t<std::is_convertible<Func, std::function<void(const BoundArgs&..., const std::shared_ptr<ChildWindow>&)>>::value>* = nullptr>
 unsigned int connect(const Func& func, const BoundArgs&... args)
 {
 return Signal::connect([=]{ invokeFunc(func, args..., dereferenceChildWindow()); });
 }
 
 
 bool emit(ChildWindow* param);
 
 
 private:
 
 static std::shared_ptr<ChildWindow> dereferenceChildWindow();
 
 
 };
 
 
 class TGUI_API SignalItem : public Signal
 {
 public:
 
 SignalItem(String&& name) :
 Signal{std::move(name), 3}
 {
 }
 
 
 template <typename Func, typename... BoundArgs>
 unsigned int operator()(const Func& func, const BoundArgs&... args)
 {
 return connect(func, args...);
 }
 
 
 template <typename Func, typename... BoundArgs, typename std::enable_if_t<std::is_convertible<Func, std::function<void(const BoundArgs&...)>>::value>* = nullptr>
 unsigned int connect(const Func& func, const BoundArgs&... args)
 {
 return Signal::connect(func, args...);
 }
 
 
 template <typename Func, typename... BoundArgs, typename std::enable_if_t<std::is_convertible<Func, std::function<void(const BoundArgs&..., int)>>::value>* = nullptr>
 unsigned int connect(const Func& func, const BoundArgs&... args)
 {
 return Signal::connect([=]{ invokeFunc(func, args..., dereferenceParam<int>(1)); });
 }
 
 
 template <typename Func, typename... BoundArgs, typename std::enable_if_t<std::is_convertible<Func, std::function<void(const BoundArgs&..., const String&)>>::value>* = nullptr>
 unsigned int connect(const Func& func, const BoundArgs&... args)
 {
 return Signal::connect([=]{ invokeFunc(func, args..., dereferenceParam<String>(2)); });
 }
 
 
 template <typename Func, typename... BoundArgs, typename std::enable_if_t<std::is_convertible<Func, std::function<void(const BoundArgs&..., const String&, const String&)>>::value>* = nullptr>
 unsigned int connect(const Func& func, const BoundArgs&... args)
 {
 return Signal::connect([=]{ invokeFunc(func, args..., dereferenceParam<String>(2), dereferenceParam<String>(3)); });
 }
 
 
 bool emit(const Widget* widget, int index, const String& item, const String& id);
 
 
 };
 
 
 class TGUI_API SignalFileDialogPaths : public Signal
 {
 public:
 
 SignalFileDialogPaths(String&& name) :
 Signal{std::move(name), 3}
 {
 }
 
 template <typename Func, typename... BoundArgs>
 unsigned int operator()(const Func& func, const BoundArgs&... args)
 {
 return connect(func, args...);
 }
 
 template <typename Func, typename... BoundArgs, typename std::enable_if_t<std::is_convertible<Func, std::function<void(const BoundArgs&...)>>::value>* = nullptr>
 unsigned int connect(const Func& func, const BoundArgs&... args)
 {
 return Signal::connect(func, args...);
 }
 
 template <typename Func, typename... BoundArgs, typename std::enable_if_t<std::is_convertible<Func, std::function<void(const BoundArgs&..., const String&)>>::value>* = nullptr>
 unsigned int connect(const Func& func, const BoundArgs&... args)
 {
 return Signal::connect([=]{ invokeFunc(func, args..., dereferenceParam<String>(1)); });
 }
 
 template <typename Func, typename... BoundArgs, typename std::enable_if_t<std::is_convertible<Func, std::function<void(const BoundArgs&..., const Filesystem::Path&)>>::value>* = nullptr>
 unsigned int connect(const Func& func, const BoundArgs&... args)
 {
 return Signal::connect([=]{ invokeFunc(func, args..., dereferenceParam<Filesystem::Path>(2)); });
 }
 
 template <typename Func, typename... BoundArgs, typename std::enable_if_t<std::is_convertible<Func, std::function<void(const BoundArgs&..., const std::vector<Filesystem::Path>&)>>::value>* = nullptr>
 unsigned int connect(const Func& func, const BoundArgs&... args)
 {
 return Signal::connect([=]{ invokeFunc(func, args..., dereferenceParam<std::vector<Filesystem::Path>>(3)); });
 }
 
 bool emit(const Widget* widget, const std::vector<Filesystem::Path>& paths);
 };
 
 
 class TGUI_API SignalShowEffect : public Signal
 {
 public:
 
 SignalShowEffect(String&& name) :
 Signal{std::move(name), 2}
 {
 }
 
 
 template <typename Func, typename... BoundArgs>
 unsigned int operator()(const Func& func, const BoundArgs&... args)
 {
 return connect(func, args...);
 }
 
 
 template <typename Func, typename... BoundArgs, typename std::enable_if_t<std::is_convertible<Func, std::function<void(const BoundArgs&...)>>::value>* = nullptr>
 unsigned int connect(const Func& func, const BoundArgs&... args)
 {
 return Signal::connect(func, args...);
 }
 
 
 template <typename Func, typename... BoundArgs, typename std::enable_if_t<std::is_convertible<Func, std::function<void(const BoundArgs&..., ShowEffectType)>>::value>* = nullptr>
 unsigned int connect(const Func& func, const BoundArgs&... args)
 {
 return Signal::connect([=]{ invokeFunc(func, args..., dereferenceParam<ShowEffectType>(1)); });
 }
 
 
 template <typename Func, typename... BoundArgs, typename std::enable_if_t<std::is_convertible<Func, std::function<void(const BoundArgs&..., bool)>>::value>* = nullptr>
 unsigned int connect(const Func& func, const BoundArgs&... args)
 {
 return Signal::connect([=]{ invokeFunc(func, args..., dereferenceParam<bool>(2)); });
 }
 
 
 template <typename Func, typename... BoundArgs, typename std::enable_if_t<std::is_convertible<Func, std::function<void(const BoundArgs&..., ShowEffectType, bool)>>::value>* = nullptr>
 unsigned int connect(const Func& func, const BoundArgs&... args)
 {
 return Signal::connect([=]{ invokeFunc(func, args..., dereferenceParam<ShowEffectType>(1), dereferenceParam<bool>(2)); });
 }
 
 
 bool emit(const Widget* widget, ShowEffectType type, bool visible);
 
 
 };
 
 
 class TGUI_API SignalAnimationType : public Signal
 {
 public:
 
 SignalAnimationType(String&& name) :
 Signal{std::move(name), 1}
 {
 }
 
 
 template <typename Func, typename... BoundArgs>
 unsigned int operator()(const Func& func, const BoundArgs&... args)
 {
 return connect(func, args...);
 }
 
 
 template <typename Func, typename... BoundArgs, typename std::enable_if_t<std::is_convertible<Func, std::function<void(const BoundArgs&...)>>::value>* = nullptr>
 unsigned int connect(const Func& func, const BoundArgs&... args)
 {
 return Signal::connect(func, args...);
 }
 
 
 template <typename Func, typename... BoundArgs, typename std::enable_if_t<std::is_convertible<Func, std::function<void(const BoundArgs&..., AnimationType)>>::value>* = nullptr>
 unsigned int connect(const Func& func, const BoundArgs&... args)
 {
 return Signal::connect([=]{ invokeFunc(func, args..., dereferenceParam<AnimationType>(1)); });
 }
 
 
 bool emit(const Widget* widget, AnimationType type);
 
 
 };
 
 
 class TGUI_API SignalItemHierarchy : public Signal
 {
 public:
 
 SignalItemHierarchy(String&& name) :
 Signal{std::move(name), 2}
 {
 }
 
 
 template <typename Func, typename... BoundArgs>
 unsigned int operator()(const Func& func, const BoundArgs&... args)
 {
 return connect(func, args...);
 }
 
 
 template <typename Func, typename... BoundArgs, typename std::enable_if_t<std::is_convertible<Func, std::function<void(const BoundArgs&...)>>::value>* = nullptr>
 unsigned int connect(const Func& func, const BoundArgs&... args)
 {
 return Signal::connect(func, args...);
 }
 
 
 template <typename Func, typename... BoundArgs, typename std::enable_if_t<std::is_convertible<Func, std::function<void(const BoundArgs&..., const String&)>>::value>* = nullptr>
 unsigned int connect(const Func& func, const BoundArgs&... args)
 {
 return Signal::connect([=]{ invokeFunc(func, args..., dereferenceParam<String>(1)); });
 }
 
 
 template <typename Func, typename... BoundArgs, typename std::enable_if_t<std::is_convertible<Func, std::function<void(const BoundArgs&..., const std::vector<String>&)>>::value>* = nullptr>
 unsigned int connect(const Func& func, const BoundArgs&... args)
 {
 return Signal::connect([=]{ invokeFunc(func, args..., dereferenceParam<std::vector<String>>(2)); });
 }
 
 
 bool emit(const Widget* widget, const String& item, const std::vector<String>& fullItem);
 
 
 };
 
}
 
 
#endif // TGUI_SIGNAL_HPP