1 files changed, 114 insertions, 0 deletions
diff --git a/include/unotools/options.hxx b/include/unotools/options.hxx
new file mode 100644
index 000000000..4e0206ace
--- /dev/null
+++ b/include/unotools/options.hxx
@@ -0,0 +1,114 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * 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/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_UNOTOOLS_OPTIONS_HXX
+#define INCLUDED_UNOTOOLS_OPTIONS_HXX
+
+#include <sal/config.h>
+#include <unotools/unotoolsdllapi.h>
+#include <o3tl/typed_flags_set.hxx>
+#include <vector>
+#include <memory>
+
+// bits for broadcasting hints of changes in ConfigurationListener::ConfigurationChanged, may be combined
+enum class ConfigurationHints {
+    NONE               = 0x0000,
+    Locale             = 0x0001,
+    Currency           = 0x0002,
+    UiLocale           = 0x0004,
+    DecSep             = 0x0008,
+    DatePatterns       = 0x0010,
+    IgnoreLang         = 0x0020,
+    CtlSettingsChanged = 0x2000,
+};
+namespace o3tl {
+    template<> struct typed_flags<ConfigurationHints> : is_typed_flags<ConfigurationHints, 0x203f> {};
+}
+
+/*
+    The class utl::detail::Options provides a kind of multiplexer. It implements a ConfigurationListener
+    that is usually registered at a ConfigItem class. At the same time it implements a ConfigurationBroadcaster
+    that allows further ("external") listeners to register.
+    Once the class deriving from Options is notified about
+    configuration changes by the ConfigItem if its content has been changed by calling some of its methods,
+    a call of the Options::NotifyListeners() method will send out notifications to all external listeners.
+*/
+
+namespace utl {
+
+    class ConfigurationBroadcaster;
+
+    // interface for configuration listener
+    class UNOTOOLS_DLLPUBLIC ConfigurationListener
+    {
+    public:
+        virtual ~ConfigurationListener();
+
+        virtual void ConfigurationChanged( ConfigurationBroadcaster* p, ConfigurationHints nHint ) = 0;
+    };
+    typedef ::std::vector< ConfigurationListener* > IMPL_ConfigurationListenerList;
+
+    // complete broadcasting implementation
+    class UNOTOOLS_DLLPUBLIC ConfigurationBroadcaster
+    {
+        std::unique_ptr<IMPL_ConfigurationListenerList> mpList;
+        sal_Int32               m_nBroadcastBlocked;     // broadcast only if this is 0
+        ConfigurationHints      m_nBlockedHint;
+
+    public:
+        void AddListener( utl::ConfigurationListener* pListener );
+        void RemoveListener( utl::ConfigurationListener const * pListener );
+
+        // notify listeners; nHint is an implementation detail of the particular class deriving from ConfigurationBroadcaster
+        void NotifyListeners( ConfigurationHints nHint );
+        ConfigurationBroadcaster();
+        ConfigurationBroadcaster(ConfigurationBroadcaster const & );
+        virtual ~ConfigurationBroadcaster();
+        ConfigurationBroadcaster & operator =(ConfigurationBroadcaster const & other);
+        virtual void BlockBroadcasts( bool bBlock );
+    };
+
+namespace detail {
+
+// A base class for the various option classes supported by
+// unotools/source/config/itemholderbase.hxx (which must be public, as it is
+// shared between unotools, svl and svt)
+// It also provides an implementation for a Configuration Listener and inherits a broadcaster implementation
+
+class SAL_WARN_UNUSED UNOTOOLS_DLLPUBLIC Options
+    : public utl::ConfigurationBroadcaster, public utl::ConfigurationListener
+{
+public:
+    Options();
+
+    virtual ~Options() override = 0;
+
+private:
+    Options(Options const &) = delete;
+    Options& operator =(Options const &) = delete;
+
+protected:
+    virtual void ConfigurationChanged( ::utl::ConfigurationBroadcaster* p, ConfigurationHints nHint ) override;
+};
+
+} }
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */