FreeCAD

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 /****************************************************************************
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  *   Copyright (c) 2023 Zheng Lei (realthunder) <realthunder.dev@gmail.com> *
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  *                                                                          *
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  *   This file is part of the FreeCAD CAx development system.               *
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  *                                                                          *
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  *   FreeCAD is free software: you can redistribute it and/or modify it     *
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  *   under the terms of the GNU Lesser General Public License as            *
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  *   published by the Free Software Foundation, either version 2.1 of the   *
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  *   License, or (at your option) any later version.                        *
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  *                                                                          *
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  *   FreeCAD is distributed in the hope that it will be useful, but         *
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  *   WITHOUT ANY WARRANTY; without even the implied warranty of             *
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  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU       *
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  *   Lesser General Public License for more details.                        *
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  *                                                                          *
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  *   You should have received a copy of the GNU Lesser General Public       *
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  *   License along with FreeCAD. If not, see                                *
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  *   <https://www.gnu.org/licenses/>.                                       *
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  *                                                                          *
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  ***************************************************************************/
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#include "PreCompiled.h"
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#ifndef _PreComp_
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#endif
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#include "ParamHandler.h"
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using namespace Gui;
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ParamHandlers::ParamHandlers()
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{
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}
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ParamHandlers::~ParamHandlers()
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{
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}
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void ParamHandlers::addHandler(const ParamKey &key, const std::shared_ptr<ParamHandler> &handler)
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{
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    if (handlers.empty()) {
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        conn = App::GetApplication().GetUserParameter().signalParamChanged.connect(
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            [this](ParameterGrp *Param, ParameterGrp::ParamType, const char *Name, const char *) {
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                if (!Param || !Name)
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                    return;
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                auto it =  handlers.find(ParamKey(Param, Name));
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                if (it != handlers.end() && it->second->onChange(&it->first)) {
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                    pendings.insert(it->second);
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                    timer.start(100);
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                }
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            });
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        timer.setSingleShot(true);
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        QObject::connect(&timer, &QTimer::timeout, [this]() {
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            for (const auto &v : pendings) {
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                v->onTimer();
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            }
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            pendings.clear();
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        });
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    }
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    handlers[key] = handler;
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}
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