Matching log can be enabled from login screen

* own enable UI component
* adjusted login and matcher UI component

src/blackgui/components/modelmatcherlogenable.h

@@ -0,0 +1,63 @@
+/* Copyright (C) 2018
+ * swift project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
+
+//! \file
+
+#ifndef BLACKGUI_COMPONENTS_MODELMATCHERLOGENABLE_H
+#define BLACKGUI_COMPONENTS_MODELMATCHERLOGENABLE_H
+
+#include "blackcore/network.h"
+#include <QFrame>
+#include <QScopedPointer>
+
+namespace Ui { class CModelMatcherLogEnable; }
+namespace BlackGui
+{
+    namespace Components
+    {
+        //! Enable/disable matching logs
+        class CModelMatcherLogEnable : public QFrame
+        {
+            Q_OBJECT
+
+        public:
+            //! Constructor
+            explicit CModelMatcherLogEnable(QWidget *parent = nullptr);
+
+            //! Destructor
+            virtual ~CModelMatcherLogEnable();
+
+            //! Reverse lookup enabled?
+            bool isReverseLookupLogEnabled() const;
+
+            //! Matching log.enabled
+            bool isMatchingLogEnabled() const;
+
+        private:
+            QScopedPointer<Ui::CModelMatcherLogEnable> ui;
+
+            //! Flag changed
+            void enabledCheckboxChanged(bool enabled);
+
+            //! Init GUI
+            void initGui();
+
+            //! Has required context
+            bool hasContexts() const;
+
+            //! When values changed elsewhere
+            void valuesChanged();
+
+            //! Connection status has been changed
+            void connectionStatusChanged(BlackCore::INetwork::ConnectionStatus from, BlackCore::INetwork::ConnectionStatus to);
+        };
+    } // ns
+} // ns
+
+#endif // guard