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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_ACTIVITIESQUEUE_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_INC_ACTIVITIESQUEUE_HXX
+
+#include <deque>
+
+#include "activity.hxx"
+
+#include <canvas/elapsedtime.hxx>
+
+#include <memory>
+
+
+/* Definition of ActivitiesQueue class */
+
+namespace slideshow::internal
+ {
+ /** This class handles the XSprite updates needed for
+ animations, such as moves, scales etc. You can add
+ activity objects to this class, which are called in a
+ round-robin fashion.
+ */
+ class ActivitiesQueue
+ {
+ public:
+ /** Create an ActivitiesQueue.
+
+ @param pPresTimer
+ Pointer to global presentation timer. Used for
+ adjusting and holding global presentation time.
+ */
+ explicit ActivitiesQueue(
+ std::shared_ptr< ::canvas::tools::ElapsedTime > pPresTimer );
+ ~ActivitiesQueue();
+ ActivitiesQueue(const ActivitiesQueue&) = delete;
+ ActivitiesQueue& operator=(const ActivitiesQueue&) = delete;
+
+ /** Add the given activity to the queue.
+ */
+ bool addActivity( const ActivitySharedPtr& pActivity );
+
+ /** Add the given activity prioritized last in the queue.
+ */
+ bool addTailActivity( const ActivitySharedPtr& pActivity );
+
+ /** Process the activities queue.
+
+ This method performs the smallest atomic processing
+ possible on the queue (typically, this means one
+ activity get processed).
+ */
+ void process();
+
+ /** Call all dequeued activities' dequeued() method
+ */
+ void processDequeued();
+
+ /** Query state of the queue
+
+ @return false, if queue is empty, true otherwise
+ */
+ bool isEmpty() const;
+
+ /** Remove all pending activities from the queue.
+ */
+ void clear();
+
+ /** Gets the queue's timer object.
+ */
+ std::shared_ptr< ::canvas::tools::ElapsedTime > const &
+ getTimer() const { return mpTimer; }
+
+ private:
+ std::shared_ptr< ::canvas::tools::ElapsedTime > mpTimer;
+
+ typedef ::std::deque< ActivitySharedPtr > ActivityQueue;
+
+ ActivityQueue maCurrentActivitiesWaiting; // currently running
+ // activities, that still
+ // await processing for this
+ // round
+
+ ActivityQueue maCurrentTailActivitiesWaiting; // activities that will be
+ // processed last in the queue
+
+ ActivityQueue maCurrentActivitiesReinsert; // currently running
+ // activities, that are
+ // already processed for
+ // this round, and wants
+ // to be reinserted next
+ // round
+
+ ActivityQueue maDequeuedActivities; // This list collects all activities which did not request
+ // a reinsertion. After the screen update has been
+ // performed, those are notified via dequeued(). This
+ // facilitates cleanup actions taking place _after_ the
+ // current frame has been displayed.
+ };
+
+}
+#endif // INCLUDED_SLIDESHOW_SOURCE_INC_ACTIVITIESQUEUE_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */