AFieldSignalEmitter.h

/*
 * AUI Framework - Declarative UI toolkit for modern C++20
 * Copyright (C) 2020-2025 Alex2772 and Contributors
 *
 * SPDX-License-Identifier: MPL-2.0
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
 
#pragma once
#include "AUI/Common/ASignal.h"

template <typename T>
class AFieldSignalEmitter
{
public:
   using signal_t = ASignal<T>&;
private:
   signal_t mSignal;
   T mValue;
 
public:
   AFieldSignalEmitter(signal_t signal, T initial = T()):
       mSignal(signal), mValue(std::move(initial))
   {
       
   }
 
   AFieldSignalEmitter& operator=(T t)
   {
       if (mValue != t) {
           mValue = std::move(t);
           mSignal(mValue);
       }
       return *this;
   }
   operator T() const
   {
       return mValue;
   }
};
 
template <>
class AFieldSignalEmitter<bool>
{
   using T = bool;
public:
   using signal_t = ASignal<T> &;
   using signal_sub_t = ASignal<> &;
private:
   signal_t mSignal;
   signal_sub_t mSignalTrue;
   signal_sub_t mSignalFalse;
   T mValue;
 
public:
   AFieldSignalEmitter(signal_t signal, signal_sub_t signalTrue, signal_sub_t signalFalse, T initial = false)
       : mSignal(signal),
         mSignalTrue(signalTrue),
         mSignalFalse(signalFalse),
         mValue(initial)
   {
   }
 
   AFieldSignalEmitter& set(AObject* emitter, const T& t)
   {
       if (mValue != t) {
           mValue = t;
           mSignal(t).invokeSignal(emitter);
           if (t)
           {
               mSignalTrue().invokeSignal(emitter);
           }
           else
           {
               mSignalFalse().invokeSignal(emitter);
           }
       }
       return *this;
   }
   operator bool() const
   {
       return mValue;
   }
};

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