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|
/***********************************************************************
* fcallback.h - Implements the callback functionality *
* *
* This file is part of the FINAL CUT widget toolkit *
* *
* Copyright 2020-2022 Markus Gans *
* *
* FINAL CUT is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License as *
* published by the Free Software Foundation; either version 3 of *
* the License, or (at your option) any later version. *
* *
* FINAL CUT is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
***********************************************************************/
/* Standalone class
* ════════════════
*
* ▕▔▔▔▔▔▔▔▔▔▔▔▏1 *▕▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▏
* ▕ FCallback ▏- - - -▕ FCallbackData ▏
* ▕▁▁▁▁▁▁▁▁▁▁▁▏ ▕▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▏
*/
#ifndef FCALLBACK_H
#define FCALLBACK_H
#if !defined (USE_FINAL_H) && !defined (COMPILE_FINAL_CUT)
#error "Only <final/final.h> can be included directly."
#endif
#include <utility>
#include <vector>
#include "final/ftypes.h"
#include "final/util/fstring.h"
namespace finalcut
{
// class forward declaration
class FWidget;
//----------------------------------------------------------------------
// struct FCallbackData
//----------------------------------------------------------------------
struct FCallbackData
{
// Constructor
FCallbackData() = default;
template <typename FuncPtr>
FCallbackData (FString&& s, FWidget* i, FuncPtr m, FCall&& c)
: cb_signal(std::move(s))
, cb_instance(i)
, cb_function_ptr(m)
, cb_function(std::move(c))
{ }
FCallbackData (const FCallbackData&) = default;
FCallbackData (FCallbackData&&) noexcept = default;
auto operator = (const FCallbackData&) -> FCallbackData& = default;
auto operator = (FCallbackData&&) noexcept -> FCallbackData& = default;
// Data members
FString cb_signal{};
FWidget* cb_instance{};
void* cb_function_ptr{};
FCall cb_function{};
};
//----------------------------------------------------------------------
// class FCallback
//----------------------------------------------------------------------
class FCallback
{
public:
// Using-declaration
template <typename T>
using enable_if_ObjectPointer_t =
std::enable_if_t< ! std::is_member_function_pointer<T>::value
&& ! std::is_function<std::remove_pointer_t<T>>::value
&& ! std::is_function<T>::value
&& std::is_pointer<T>::value
&& std::is_object<T>::value
&& ! std::is_class<T>::value
, std::nullptr_t >;
template <typename T>
using enable_if_ClassObject_t =
std::enable_if_t< ! std::is_member_function_pointer<T>::value
&& ! std::is_function<std::remove_pointer_t<T>>::value
&& ! std::is_function<T>::value
&& ! std::is_pointer<T>::value
&& std::is_object<T>::value
&& std::is_class<T>::value
, std::nullptr_t >;
template <typename T>
using enable_if_MemberFunctionPointer_t =
std::enable_if_t< std::is_member_function_pointer<T>::value
&& ! std::is_function<std::remove_pointer_t<T>>::value
&& ! std::is_function<T>::value
&& ! std::is_pointer<T>::value
&& std::is_object<T>::value
&& ! std::is_class<T>::value
, std::nullptr_t >;
template <typename T>
using enable_if_FunctionPointer_t =
std::enable_if_t< ! std::is_member_function_pointer<T>::value
&& std::is_function<std::remove_pointer_t<T>>::value
&& ! std::is_function<T>::value
&& std::is_pointer<T>::value
&& std::is_object<T>::value
&& ! std::is_class<T>::value
, std::nullptr_t >;
template <typename T>
using enable_if_FunctionReference_t =
std::enable_if_t< ! std::is_member_function_pointer<T>::value
&& std::is_function<std::remove_pointer_t<T>>::value
&& std::is_function<T>::value
&& ! std::is_pointer<T>::value
&& ! std::is_object<T>::value
&& ! std::is_class<T>::value
, std::nullptr_t >;
// Constructors
FCallback() = default;
// Disable copy constructor
FCallback (const FCallback&) = delete;
// Destructor
~FCallback() noexcept = default;
// Disable copy assignment operator (=)
auto operator = (const FCallback&) -> FCallback& = delete;
// Accessors
auto getClassName() const -> FString;
auto getCallbackCount() const -> std::size_t;
// Methods
template <typename Object
, typename Function
, enable_if_ObjectPointer_t<Object> = nullptr
, enable_if_MemberFunctionPointer_t<Function> = nullptr
, typename... Args>
void addCallback ( FString&& cb_signal
, Object&& cb_instance
, Function&& cb_member
, Args&&... args) noexcept;
template <typename Object
, typename Function
, enable_if_ObjectPointer_t<Object> = nullptr
, enable_if_ClassObject_t<Function> = nullptr
, typename... Args>
void addCallback ( FString&& cb_signal
, Object&& cb_instance
, Function&& cb_function
, Args&&... args) noexcept;
template < typename Function
, enable_if_ClassObject_t<Function> = nullptr
, typename... Args>
void addCallback ( FString&& cb_signal
, Function&& cb_function
, Args&&... args) noexcept;
template <typename Function
, enable_if_ClassObject_t<Function> = nullptr
, typename... Args>
void addCallback ( FString&& cb_signal
, Function& cb_function
, Args&&... args) noexcept;
template <typename Function
, enable_if_FunctionReference_t<Function> = nullptr
, typename... Args>
void addCallback ( FString&& cb_signal
, Function& cb_function
, Args&&... args) noexcept;
template <typename Function
, enable_if_FunctionPointer_t<Function> = nullptr
, typename... Args>
void addCallback ( FString&& cb_signal
, Function&& cb_function
, Args&&... args) noexcept;
template <typename Object
, enable_if_ObjectPointer_t<Object> = nullptr>
void delCallback (Object&& cb_instance) noexcept;
void delCallback (const FString& cb_signal);
template <typename Object
, enable_if_ObjectPointer_t<Object> = nullptr>
void delCallback ( const FString& cb_signal
, Object&& cb_instance ) noexcept;
template <typename FunctionPtr
, enable_if_FunctionPointer_t<FunctionPtr> = nullptr>
void delCallback (FunctionPtr&& cb_func_ptr) noexcept;
template <typename Function
, enable_if_FunctionReference_t<Function> = nullptr>
void delCallback (const Function& cb_function);
void delCallback();
void emitCallback (const FString& emit_signal) const;
private:
// Using-declaration
using FCallbackObjects = std::vector<FCallbackData>;
// Data members
FCallbackObjects callback_objects{};
};
// FCallback inline functions
//----------------------------------------------------------------------
inline auto FCallback::getClassName() const -> FString
{ return "FCallback"; }
//----------------------------------------------------------------------
inline auto FCallback::getCallbackCount() const -> std::size_t
{ return callback_objects.size(); }
//----------------------------------------------------------------------
template <typename Object
, typename Function
, FCallback::enable_if_ObjectPointer_t<Object>
, FCallback::enable_if_MemberFunctionPointer_t<Function>
, typename... Args>
inline void FCallback::addCallback ( FString&& cb_signal
, Object&& cb_instance
, Function&& cb_member
, Args&&... args) noexcept
{
// Add a member function pointer as callback
Object instance = cb_instance;
auto fn = std::bind ( std::forward<Function>(cb_member)
, std::forward<Object>(cb_instance)
, std::forward<Args>(args)... );
callback_objects.emplace_back (std::move(cb_signal), instance, nullptr, fn);
}
//----------------------------------------------------------------------
template <typename Object
, typename Function
, FCallback::enable_if_ObjectPointer_t<Object>
, FCallback::enable_if_ClassObject_t<Function>
, typename... Args>
inline void FCallback::addCallback ( FString&& cb_signal
, Object&& cb_instance
, Function&& cb_function
, Args&&... args) noexcept
{
// Add a function object to an instance as callback
auto fn = std::bind (std::forward<Function>(cb_function), std::forward<Args>(args)...);
callback_objects.emplace_back (std::move(cb_signal), cb_instance, nullptr, fn);
}
//----------------------------------------------------------------------
template <typename Function
, FCallback::enable_if_ClassObject_t<Function>
, typename... Args>
inline void FCallback::addCallback ( FString&& cb_signal
, Function&& cb_function
, Args&&... args) noexcept
{
// Add a function object as callback
auto fn = std::bind ( std::forward<Function>(cb_function)
, std::forward<Args>(args)... );
callback_objects.emplace_back (std::move(cb_signal), nullptr, nullptr, fn);
}
//----------------------------------------------------------------------
template <typename Function
, FCallback::enable_if_ClassObject_t<Function>
, typename... Args>
inline void FCallback::addCallback ( FString&& cb_signal
, Function& cb_function
, Args&&... args) noexcept
{
// Add a function object reference as callback
auto fn = std::bind (cb_function, std::forward<Args>(args)...);
callback_objects.emplace_back (std::move(cb_signal), nullptr, nullptr, fn);
}
//----------------------------------------------------------------------
template <typename Function
, FCallback::enable_if_FunctionReference_t<Function>
, typename... Args>
inline void FCallback::addCallback ( FString&& cb_signal
, Function& cb_function
, Args&&... args) noexcept
{
// Add a function reference as callback
auto ptr = reinterpret_cast<void*>(&cb_function);
auto fn = std::bind (cb_function, std::forward<Args>(args)...);
callback_objects.emplace_back (std::move(cb_signal), nullptr, ptr, fn);
}
//----------------------------------------------------------------------
template <typename Function
, FCallback::enable_if_FunctionPointer_t<Function>
, typename... Args>
inline void FCallback::addCallback ( FString&& cb_signal
, Function&& cb_function
, Args&&... args) noexcept
{
// Add a function pointer as callback
auto ptr = reinterpret_cast<void*>(cb_function);
auto fn = std::bind ( std::forward<Function>(cb_function)
, std::forward<Args>(args)... );
callback_objects.emplace_back(std::move(cb_signal), nullptr, ptr, fn);
}
//----------------------------------------------------------------------
template <typename Object
, FCallback::enable_if_ObjectPointer_t<Object>>
inline void FCallback::delCallback (Object&& cb_instance) noexcept
{
// Deletes entries with the given instance from the callback list
if ( callback_objects.empty() )
return;
auto iter = callback_objects.cbegin();
while ( iter != callback_objects.cend() )
{
if ( iter->cb_instance == cb_instance )
iter = callback_objects.erase(iter);
else
++iter;
}
}
//----------------------------------------------------------------------
template <typename Object
, FCallback::enable_if_ObjectPointer_t<Object>>
inline void FCallback::delCallback ( const FString& cb_signal
, Object&& cb_instance ) noexcept
{
// Deletes entries with the given signal and instance
// from the callback list
if ( callback_objects.empty() )
return;
auto iter = callback_objects.cbegin();
while ( iter != callback_objects.cend() )
{
if ( iter->cb_signal == cb_signal
&& iter->cb_instance == cb_instance )
iter = callback_objects.erase(iter);
else
++iter;
}
}
//----------------------------------------------------------------------
template <typename FunctionPtr
, FCallback::enable_if_FunctionPointer_t<FunctionPtr>>
inline void FCallback::delCallback (FunctionPtr&& cb_func_ptr) noexcept
{
// Deletes entries with the given function pointer
// from the callback list
if ( callback_objects.empty() )
return;
auto ptr = reinterpret_cast<void*>(cb_func_ptr);
auto iter = callback_objects.cbegin();
while ( iter != callback_objects.cend() )
{
if ( iter->cb_function_ptr == ptr )
iter = callback_objects.erase(iter);
else
++iter;
}
}
//----------------------------------------------------------------------
template <typename Function
, FCallback::enable_if_FunctionReference_t<Function>>
inline void FCallback::delCallback (const Function& cb_function)
{
// Deletes entries with the given function reference
// from the callback list
if ( callback_objects.empty() )
return;
auto ptr = reinterpret_cast<void*>(&cb_function);
auto iter = callback_objects.cbegin();
while ( iter != callback_objects.cend() )
{
if ( iter->cb_function_ptr == ptr )
iter = callback_objects.erase(iter);
else
++iter;
}
}
} // namespace finalcut
#endif // FCALLBACK_H
|
