    /* -*- 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 "PresenterSpritePane.hxx"
    #include "PresenterGeometryHelper.hxx"
    #include <com/sun/star/lang/XMultiComponentFactory.hpp>
    #include <com/sun/star/rendering/CompositeOperation.hpp>

    using namespace ::com::sun::star;
    using namespace ::com::sun::star::uno;
    using namespace ::com::sun::star::drawing::framework;

    namespace sdext { namespace presenter {

    //===== PresenterSpritePane =========================================================

    PresenterSpritePane::PresenterSpritePane (const Reference<XComponentContext>& rxContext,
            const ::rtl::Reference<PresenterController>& rpPresenterController)
        : PresenterPaneBase(rxContext, rpPresenterController),
          mxParentCanvas(),
          mpSprite(new PresenterSprite())
    {
        Reference<lang::XMultiComponentFactory> xFactory (
            mxComponentContext->getServiceManager(), UNO_QUERY_THROW);
        mxPresenterHelper.set(
            xFactory->createInstanceWithContext(
                "com.sun.star.comp.Draw.PresenterHelper",
                mxComponentContext),
            UNO_QUERY_THROW);
    }

    PresenterSpritePane::~PresenterSpritePane()
    {
    }

    void PresenterSpritePane::disposing()
    {
        mpSprite->SetFactory(nullptr);
        mxParentCanvas = nullptr;
        PresenterPaneBase::disposing();
    }

    //----- XPane -----------------------------------------------------------------

    Reference<awt::XWindow> SAL_CALL PresenterSpritePane::getWindow()
    {
        ThrowIfDisposed();
        return mxContentWindow;
    }

    Reference<rendering::XCanvas> SAL_CALL PresenterSpritePane::getCanvas()
    {
        ThrowIfDisposed();

        if ( ! mxContentCanvas.is())
            UpdateCanvases();

        return mxContentCanvas;
    }

    //----- XWindowListener -------------------------------------------------------

    void SAL_CALL PresenterSpritePane::windowResized (const awt::WindowEvent& rEvent)
    {
        PresenterPaneBase::windowResized(rEvent);

        mpSprite->Resize(geometry::RealSize2D(rEvent.Width, rEvent.Height));
        LayoutContextWindow();
        UpdateCanvases();
    }

    void SAL_CALL PresenterSpritePane::windowMoved (const awt::WindowEvent& rEvent)
    {
        PresenterPaneBase::windowMoved(rEvent);

        awt::Rectangle aBox (
            mxPresenterHelper->getWindowExtentsRelative(mxBorderWindow, mxParentWindow));
        mpSprite->MoveTo(geometry::RealPoint2D(aBox.X, aBox.Y));
        mpSprite->Update();
    }

    void SAL_CALL PresenterSpritePane::windowShown (const lang::EventObject& rEvent)
    {
        PresenterPaneBase::windowShown(rEvent);

        mpSprite->Show();
        ToTop();

        if (mxContentWindow.is())
        {
            LayoutContextWindow();
            mxContentWindow->setVisible(true);
        }
    }

    void SAL_CALL PresenterSpritePane::windowHidden (const lang::EventObject& rEvent)
    {
        PresenterPaneBase::windowHidden(rEvent);

        mpSprite->Hide();
        if (mxContentWindow.is())
            mxContentWindow->setVisible(false);
    }

    //----- XPaintListener --------------------------------------------------------

    void SAL_CALL PresenterSpritePane::windowPaint (const awt::PaintEvent&)
    {
        ThrowIfDisposed();

        /*
        Reference<rendering::XSpriteCanvas> xSpriteCanvas (mxParentCanvas, UNO_QUERY);
        if (xSpriteCanvas.is())
            xSpriteCanvas->updateScreen(sal_False);
        */
    }

    const std::shared_ptr<PresenterSprite>& PresenterSpritePane::GetSprite()
    {
        return mpSprite;
    }

    void PresenterSpritePane::UpdateCanvases()
    {
        Reference<XComponent> xContentCanvasComponent (mxContentCanvas, UNO_QUERY);
        if (xContentCanvasComponent.is())
        {
            if (xContentCanvasComponent.is())
                xContentCanvasComponent->dispose();
        }

        // The border canvas is the content canvas of the sprite.
        mxBorderCanvas = mpSprite->GetCanvas();

        // The content canvas is a wrapper of the border canvas.
        if (mxBorderCanvas.is())
            mxContentCanvas = mxPresenterHelper->createSharedCanvas(
                mxParentCanvas,
                mxParentWindow,
                mxBorderCanvas,
                mxBorderWindow,
                mxContentWindow);

        const awt::Rectangle aWindowBox (mxBorderWindow->getPosSize());
        PaintBorder(awt::Rectangle(0,0,aWindowBox.Width,aWindowBox.Height));
    }

    void PresenterSpritePane::CreateCanvases (
        const css::uno::Reference<css::rendering::XSpriteCanvas>& rxParentCanvas)
    {
        OSL_ASSERT(!mxParentCanvas.is() || mxParentCanvas==rxParentCanvas);
        mxParentCanvas = rxParentCanvas;

        mpSprite->SetFactory(mxParentCanvas);
        if (mxBorderWindow.is())
        {
            const awt::Rectangle aBorderBox (mxBorderWindow->getPosSize());
            mpSprite->Resize(geometry::RealSize2D(aBorderBox.Width, aBorderBox.Height));
        }

        UpdateCanvases();
    }

    } } // end of namespace ::sd::presenter

    /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

↑ V571 Recurring check. The 'if (xContentCanvasComponent.is())' condition was already verified in line 143.