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+/* -*- 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_SD_SOURCE_UI_INC_EVENTMULTIPLEXER_HXX
+#define INCLUDED_SD_SOURCE_UI_INC_EVENTMULTIPLEXER_HXX
+
+#include <sal/config.h>
+
+#include <rtl/ref.hxx>
+
+template <typename Arg, typename Ret> class Link;
+
+namespace sd {
+class ViewShellBase;
+}
+
+
+enum class EventMultiplexerEventId
+{
+    /** The EventMultiplexer itself is being disposed.  Called for a live
+        EventMultiplexer.  Removing a listener as response is not necessary,
+        though.
+    */
+    Disposing,
+
+    /** The selection in the center pane has changed.
+    */
+    EditViewSelection,
+
+    /** The selection in the slide sorter has changed, regardless of whether
+        the slide sorter is displayed in the left pane or the center pane.
+    */
+    SlideSortedSelection,
+
+    /** The current page has changed.
+    */
+    CurrentPageChanged,
+
+    /** The current MainViewShell (the ViewShell displayed in the center
+        pane) has been removed.
+    */
+    MainViewRemoved,
+
+    /** A new ViewShell has been made the MainViewShell.
+    */
+    MainViewAdded,
+
+    /** A new ViewShell is being displayed in one of the panes.  Note that
+        for the ViewShell in the center pane both this event type and
+        EventId::MainViewAdded is broadcasted.
+    */
+    ViewAdded,
+
+    /** Edit mode was (or is being) switched to normal mode.  Find
+        EventId::EditModeMaster below.
+    */
+    EditModeNormal,
+
+    /** One or more pages have been inserted into or deleted from the model.
+    */
+    PageOrder,
+
+    /** Text editing in one of the shapes in the MainViewShell has started.
+    */
+    BeginTextEdit,
+
+    /** Text editing in one of the shapes in the MainViewShell has ended.
+    */
+    EndTextEdit,
+
+    /** A UNO controller has been attached to the UNO frame.
+    */
+    ControllerAttached,
+
+    /** A UNO controller has been detached to the UNO frame.
+    */
+    ControllerDetached,
+
+    /** The state of a shape has changed.  The page is available in the user data.
+    */
+    ShapeChanged,
+
+    /** A shape has been inserted to a page.  The page is available in the
+        user data.
+    */
+    ShapeInserted,
+
+    /** A shape has been removed from a page.  The page is available in the
+        user data.
+    */
+    ShapeRemoved,
+
+    /** A configuration update has been completed.
+    */
+    ConfigurationUpdated,
+
+    /** Edit mode was (or is being) switched to master mode.
+    */
+    EditModeMaster,
+};
+
+namespace sd::tools {
+
+class EventMultiplexerEvent
+{
+public:
+    EventMultiplexerEventId meEventId;
+    const void* mpUserData;
+
+    EventMultiplexerEvent (
+        EventMultiplexerEventId eEventId,
+        const void* pUserData);
+};
+
+/** This convenience class makes it easy to listen to various events that
+    originally are broadcasted via different channels.
+
+    There is usually one EventMultiplexer instance per ViewShellBase().
+    Call the laters GetEventMultiplexer() method to get access to that
+    instance.
+*/
+class EventMultiplexer
+{
+public:
+    /** Create new EventMultiplexer for the given ViewShellBase object.
+    */
+    EventMultiplexer (ViewShellBase& rBase);
+    ~EventMultiplexer();
+
+    /** Add an event listener that will be informed about the specified
+        event types.
+        @param rCallback
+            The callback to call as soon as one of the event specified by
+            aEventTypeSet is received by the EventMultiplexer.
+    */
+    void AddEventListener(const Link<EventMultiplexerEvent&,void>& rCallback);
+
+    /** Remove an event listener for the specified event types.
+    */
+    void RemoveEventListener(const Link<EventMultiplexerEvent&,void>& rCallback);
+
+    /** This method is used for out-of-line events.  An event of the
+        specified type will be sent to all listeners that are registered for
+        that type.
+        @param eEventId
+            The type of the event.
+        @param pUserData
+            Some data sent to the listeners along with the event.
+    */
+    void MultiplexEvent(
+        EventMultiplexerEventId eEventId,
+        void const * pUserData);
+
+private:
+    class Implementation;
+    rtl::Reference<Implementation> mpImpl;
+};
+
+} // end of namespace ::sd::tools
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */