1 files changed, 173 insertions, 0 deletions
diff --git a/svx/source/sdr/animation/scheduler.cxx b/svx/source/sdr/animation/scheduler.cxx
new file mode 100644
index 0000000000..02017d915d
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+++ b/svx/source/sdr/animation/scheduler.cxx
@@ -0,0 +1,173 @@
+/* -*- 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 .
+ */
+
+#include <svx/sdr/animation/scheduler.hxx>
+
+#include <algorithm>
+#include <vector>
+
+
+// event class
+
+namespace sdr::animation
+{
+        Event::Event() : mnTime(0)
+        {
+        }
+
+        Event::~Event()
+        {
+        }
+
+
+        void Event::SetTime(sal_uInt32 nNew)
+        {
+            if(mnTime != nNew)
+            {
+                mnTime = nNew;
+            }
+        }
+
+        Scheduler::Scheduler()
+        :   Timer("sdr::animation::Scheduler"),
+            mnTime(0),
+            mnDeltaTime(0),
+            mbIsPaused(false)
+        {
+            SetPriority(TaskPriority::POST_PAINT);
+        }
+
+        Scheduler::~Scheduler()
+        {
+            Stop();
+        }
+
+        void Scheduler::Invoke()
+        {
+            // stop timer and add time
+            Stop();
+            mnTime += mnDeltaTime;
+
+            // execute events
+            triggerEvents();
+
+            // re-start or stop timer according to event list
+            checkTimeout();
+        }
+
+        void Scheduler::triggerEvents()
+        {
+            if (mvEvents.empty())
+                return;
+
+            // copy events which need to be executed to a vector. Remove them from
+            // the scheduler
+            ::std::vector< Event* > aToBeExecutedList;
+
+            while(!mvEvents.empty() && mvEvents.front()->GetTime() <= mnTime)
+            {
+                Event* pNextEvent = mvEvents.front();
+                mvEvents.erase(mvEvents.begin());
+                aToBeExecutedList.push_back(pNextEvent);
+            }
+
+            // execute events from the vector
+            for(auto& rpCandidate : aToBeExecutedList)
+            {
+                // trigger event. This may re-insert the event to the scheduler again
+                rpCandidate->Trigger(mnTime);
+            }
+        }
+
+        void Scheduler::checkTimeout()
+        {
+            // re-start or stop timer according to event list
+            if(!IsPaused() && !mvEvents.empty())
+            {
+                mnDeltaTime = mvEvents.front()->GetTime() - mnTime;
+
+                if(0 != mnDeltaTime)
+                {
+                    SetTimeout(mnDeltaTime);
+                    Start();
+                }
+            }
+            else
+            {
+                Stop();
+            }
+        }
+
+
+        // #i38135#
+        void Scheduler::SetTime(sal_uInt32 nTime)
+        {
+            // reset time
+            Stop();
+            mnTime = nTime;
+
+            if (mvEvents.empty())
+                return;
+
+            // reset event time points
+            for (auto & rEvent : mvEvents)
+            {
+                rEvent->SetTime(nTime);
+            }
+
+            if(!IsPaused())
+            {
+                // without delta time, init events by triggering them. This will invalidate
+                // painted objects and add them to the scheduler again
+                mnDeltaTime = 0;
+                triggerEvents();
+                checkTimeout();
+            }
+        }
+
+        void Scheduler::InsertEvent(Event& rNew)
+        {
+            // insert maintaining time ordering
+            auto it = std::find_if(mvEvents.begin(), mvEvents.end(),
+                [&rNew](const Event* pEvent) { return rNew.GetTime() < pEvent->GetTime(); });
+            mvEvents.insert(it, &rNew);
+            checkTimeout();
+        }
+
+        void Scheduler::RemoveEvent(Event* pOld)
+        {
+            if(!mvEvents.empty())
+            {
+                std::erase(mvEvents, pOld);
+                checkTimeout();
+            }
+        }
+
+        void Scheduler::SetPaused(bool bNew)
+        {
+            if(bNew != mbIsPaused)
+            {
+                mbIsPaused = bNew;
+                checkTimeout();
+            }
+        }
+
+} // end of namespace
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */