added a more flexible way of managing ProcEvents

modifying the global ProcEvent enum and refreshmap array is not needed
anymore. You can now register new events dynamically, using a ProcEventMapper
instance. See rtgui/localcontrast.cc for an example.

Hopefully this solves the problem of recurring merge conflicts when different
devs add different proc events

rtgui/eventmapper.cc

@@ -0,0 +1,63 @@
+/* -*- C++ -*-
+ *  
+ *  This file is part of RawTherapee.
+ *
+ *  Copyright (c) 2017 Alberto Griggio <alberto.griggio@gmail.com>
+ *
+ *  RawTherapee is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  RawTherapee 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with RawTherapee.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "eventmapper.h"
+
+
+ProcEventMapper::ProcEventMapper()
+{
+    for (int event = 0; event < rtengine::NUMOFEVENTS; ++event) {
+        history_msgs_[event] = "HISTORY_MSG_" + std::to_string(event + 1);
+    }
+}
+
+
+ProcEventMapper *ProcEventMapper::getInstance()
+{
+    static ProcEventMapper instance;
+    return &instance;
+}
+
+
+rtengine::ProcEvent ProcEventMapper::newEvent(int action, const std::string &history_msg)
+{
+    rtengine::ProcEvent event = rtengine::RefreshMapper::getInstance()->newEvent();
+    rtengine::RefreshMapper::getInstance()->mapEvent(event, action);    
+
+    if (history_msg.empty()) {
+        history_msgs_[event] = "HISTORY_MSG_" + std::to_string(event + 1);
+    } else {
+        history_msgs_[event] = history_msg;
+    }
+    
+    return event;
+}
+
+
+const std::string &ProcEventMapper::getHistoryMsg(rtengine::ProcEvent event) const
+{
+    static std::string empty;
+    auto it = history_msgs_.find(event);
+    if (it == history_msgs_.end()) {
+        return empty;
+    } else {
+        return it->second;
+    }
+}