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diff --git a/slideshow/source/engine/waitsymbol.cxx b/slideshow/source/engine/waitsymbol.cxx
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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 .
+ */
+
+
+#include <canvas/canvastools.hxx>
+
+#include <cppcanvas/customsprite.hxx>
+
+#include <basegfx/point/b2dpoint.hxx>
+#include <basegfx/vector/b2dvector.hxx>
+
+#include <com/sun/star/rendering/XCanvas.hpp>
+#include <com/sun/star/presentation/XSlideShowView.hpp>
+#include <tools/diagnose_ex.h>
+
+#include "waitsymbol.hxx"
+#include <eventmultiplexer.hxx>
+
+#include <algorithm>
+
+
+using namespace com::sun::star;
+
+namespace slideshow::internal {
+
+const sal_Int32 LEFT_BORDER_SPACE = 10;
+const sal_Int32 LOWER_BORDER_SPACE = 10;
+
+WaitSymbolSharedPtr WaitSymbol::create( const uno::Reference<rendering::XBitmap>& xBitmap,
+ ScreenUpdater& rScreenUpdater,
+ EventMultiplexer& rEventMultiplexer,
+ const UnoViewContainer& rViewContainer )
+{
+ WaitSymbolSharedPtr pRet(
+ new WaitSymbol( xBitmap,
+ rScreenUpdater,
+ rViewContainer ));
+
+ rEventMultiplexer.addViewHandler( pRet );
+
+ return pRet;
+}
+
+WaitSymbol::WaitSymbol( uno::Reference<rendering::XBitmap> const & xBitmap,
+ ScreenUpdater& rScreenUpdater,
+ const UnoViewContainer& rViewContainer ) :
+ mxBitmap(xBitmap),
+ maViews(),
+ mrScreenUpdater( rScreenUpdater ),
+ mbVisible(false)
+{
+ for( const auto& pView : rViewContainer )
+ viewAdded( pView );
+}
+
+void WaitSymbol::setVisible( const bool bVisible )
+{
+ if( mbVisible == bVisible )
+ return;
+
+ mbVisible = bVisible;
+
+ for( const auto& rView : maViews )
+ {
+ if( rView.second )
+ {
+ if( bVisible )
+ rView.second->show();
+ else
+ rView.second->hide();
+ }
+ }
+
+ // sprites changed, need a screen update for this frame.
+ mrScreenUpdater.requestImmediateUpdate();
+}
+
+basegfx::B2DPoint WaitSymbol::calcSpritePos(
+ UnoViewSharedPtr const & rView ) const
+{
+ const awt::Rectangle aViewArea( rView->getUnoView()->getCanvasArea() );
+ return basegfx::B2DPoint(
+ aViewArea.X + std::min<sal_Int32>( aViewArea.Width, LEFT_BORDER_SPACE ),
+ aViewArea.X + std::max<sal_Int32>( 0,
+ aViewArea.Height
+ - mxBitmap->getSize().Height
+ - LOWER_BORDER_SPACE ) );
+}
+
+void WaitSymbol::viewAdded( const UnoViewSharedPtr& rView )
+{
+ cppcanvas::CustomSpriteSharedPtr sprite;
+
+ try
+ {
+ const geometry::IntegerSize2D spriteSize( mxBitmap->getSize() );
+ sprite = rView->createSprite( basegfx::B2DVector( spriteSize.Width,
+ spriteSize.Height ),
+ 1000.0 ); // sprite should be in front of all
+ // other sprites
+ rendering::ViewState viewState;
+ canvas::tools::initViewState( viewState );
+ rendering::RenderState renderState;
+ canvas::tools::initRenderState( renderState );
+ sprite->getContentCanvas()->getUNOCanvas()->drawBitmap(
+ mxBitmap, viewState, renderState );
+
+ sprite->setAlpha( 0.9 );
+ sprite->movePixel( calcSpritePos( rView ) );
+ if( mbVisible )
+ sprite->show();
+ }
+ catch( uno::Exception& )
+ {
+ TOOLS_WARN_EXCEPTION( "slideshow", "" );
+ }
+
+ maViews.emplace_back( rView, sprite );
+}
+
+void WaitSymbol::viewRemoved( const UnoViewSharedPtr& rView )
+{
+ maViews.erase(
+ std::remove_if(
+ maViews.begin(), maViews.end(),
+ [&rView]
+ ( const ViewsVecT::value_type& cp )
+ { return rView == cp.first; } ),
+ maViews.end() );
+}
+
+void WaitSymbol::viewChanged( const UnoViewSharedPtr& rView )
+{
+ // find entry corresponding to modified view
+ ViewsVecT::iterator aModifiedEntry(
+ std::find_if(
+ maViews.begin(),
+ maViews.end(),
+ [&rView]
+ ( const ViewsVecT::value_type& cp )
+ { return rView == cp.first; } ) );
+
+ OSL_ASSERT( aModifiedEntry != maViews.end() );
+ if( aModifiedEntry == maViews.end() )
+ return;
+
+ if( aModifiedEntry->second )
+ aModifiedEntry->second->movePixel(
+ calcSpritePos(aModifiedEntry->first) );
+}
+
+void WaitSymbol::viewsChanged()
+{
+ // reposition sprites on all views
+ for( const auto& rView : maViews )
+ {
+ if( rView.second )
+ rView.second->movePixel(
+ calcSpritePos( rView.first ) );
+ }
+}
+
+} // namespace slideshow::internal
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */