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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_SLIDESHOW_SOURCE_INC_VIEWEVENTHANDLER_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_INC_VIEWEVENTHANDLER_HXX
+
+#include <memory>
+
+#include "unoview.hxx"
+#include "disposable.hxx"
+
+
+/* Definition of ViewEventHandler interface */
+
+namespace slideshow::internal
+ {
+
+ /** Interface for handling view events.
+
+ Classes implementing this interface can be added to an
+ EventMultiplexer object, and are called from there to
+ handle view events.
+ */
+ class ViewEventHandler : public virtual SharedPtrAble
+ {
+ public:
+ /** Notify new view.
+
+ @param rView
+ The newly added view
+ */
+ virtual void viewAdded( const UnoViewSharedPtr& rView ) = 0;
+
+ /** Notify removed view.
+
+ @param rView
+ The removed view
+ */
+ virtual void viewRemoved( const UnoViewSharedPtr& rView ) = 0;
+
+ /** Notify changed view.
+
+ Reasons for a viewChanged notification can be
+ different view size, transformation, or other device
+ properties (color resolution or profile, etc.)
+
+ @param rView
+ The changed view
+ */
+ virtual void viewChanged( const UnoViewSharedPtr& rView ) = 0;
+
+ /** Notify that all views changed.
+
+ Reasons for a viewChanged notification can be
+ different view size, transformation, or other device
+ properties (color resolution or profile, etc.)
+
+ Note that this method avoids hidden inefficiencies
+ (O(n^2) behaviour when viewChanged() needs to perform
+ linear searches)
+ */
+ virtual void viewsChanged() = 0;
+ };
+
+ typedef ::std::weak_ptr< ViewEventHandler > ViewEventHandlerWeakPtr;
+
+}
+
+#endif // INCLUDED_SLIDESHOW_SOURCE_INC_VIEWEVENTHANDLER_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */