Adding upstream version 1:7.0.4.upstream/1%7.0.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 754 insertions, 0 deletions

diff --git a/sdext/source/presenter/PresenterHelpView.cxx b/sdext/source/presenter/PresenterHelpView.cxx
new file mode 100644
index 000000000..9f0a55de4
--- /dev/null
+++ b/sdext/source/presenter/PresenterHelpView.cxx
@@ -0,0 +1,754 @@
+/* -*- 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 <vcl/settings.hxx>
+#include "PresenterHelpView.hxx"
+#include "PresenterButton.hxx"
+#include "PresenterCanvasHelper.hxx"
+#include "PresenterGeometryHelper.hxx"
+#include <com/sun/star/awt/XWindowPeer.hpp>
+#include <com/sun/star/container/XNameAccess.hpp>
+#include <com/sun/star/drawing/framework/XConfigurationController.hpp>
+#include <com/sun/star/drawing/framework/XControllerManager.hpp>
+#include <com/sun/star/rendering/CompositeOperation.hpp>
+#include <com/sun/star/rendering/TextDirection.hpp>
+#include <com/sun/star/util/Color.hpp>
+#include <algorithm>
+#include <numeric>
+#include <vector>
+
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::drawing::framework;
+using ::std::vector;
+
+namespace sdext::presenter {
+
+namespace {
+    const static sal_Int32 gnHorizontalGap (20);
+    const static sal_Int32 gnVerticalBorder (30);
+    const static sal_Int32 gnVerticalButtonPadding (12);
+
+    class LineDescriptor
+    {
+    public:
+        LineDescriptor();
+        void AddPart (
+            const OUString& rsLine,
+            const css::uno::Reference<css::rendering::XCanvasFont>& rxFont);
+        bool IsEmpty() const;
+
+        OUString msLine;
+        geometry::RealSize2D maSize;
+        double mnVerticalOffset;
+
+        void CalculateSize (const css::uno::Reference<css::rendering::XCanvasFont>& rxFont);
+    };
+
+    class LineDescriptorList
+    {
+    public:
+        LineDescriptorList (
+            const OUString& rsText,
+            const css::uno::Reference<css::rendering::XCanvasFont>& rxFont,
+            const sal_Int32 nMaximalWidth);
+
+        void Update (
+            const css::uno::Reference<css::rendering::XCanvasFont>& rxFont,
+            const sal_Int32 nMaximalWidth);
+
+        double Paint(
+            const Reference<rendering::XCanvas>& rxCanvas,
+            const geometry::RealRectangle2D& rBBox,
+            const bool bFlushLeft,
+            const rendering::ViewState& rViewState,
+            rendering::RenderState& rRenderState,
+            const css::uno::Reference<css::rendering::XCanvasFont>& rxFont) const;
+        double GetHeight() const;
+
+    private:
+        const OUString msText;
+        std::shared_ptr<vector<LineDescriptor> > mpLineDescriptors;
+
+        static void SplitText (const OUString& rsText, vector<OUString>& rTextParts);
+        void FormatText (
+            const vector<OUString>& rTextParts,
+            const css::uno::Reference<css::rendering::XCanvasFont>& rxFont,
+            const sal_Int32 nMaximalWidth);
+    };
+
+    class Block
+    {
+    public:
+        Block (
+            const OUString& rsLeftText,
+            const OUString& rsRightText,
+            const css::uno::Reference<css::rendering::XCanvasFont>& rxFont,
+            const sal_Int32 nMaximalWidth);
+        Block(const Block&) = delete;
+        Block& operator=(const Block&) = delete;
+        void Update (
+            const css::uno::Reference<css::rendering::XCanvasFont>& rxFont,
+            const sal_Int32 nMaximalWidth);
+
+        LineDescriptorList maLeft;
+        LineDescriptorList maRight;
+    };
+} // end of anonymous namespace
+
+class PresenterHelpView::TextContainer : public vector<std::shared_ptr<Block> >
+{
+};
+
+PresenterHelpView::PresenterHelpView (
+    const Reference<uno::XComponentContext>& rxContext,
+    const Reference<XResourceId>& rxViewId,
+    const Reference<frame::XController>& rxController,
+    const ::rtl::Reference<PresenterController>& rpPresenterController)
+    : PresenterHelpViewInterfaceBase(m_aMutex),
+      mxComponentContext(rxContext),
+      mxViewId(rxViewId),
+      mxPane(),
+      mxWindow(),
+      mxCanvas(),
+      mpPresenterController(rpPresenterController),
+      mpFont(),
+      mpTextContainer(),
+      mpCloseButton(),
+      mnSeparatorY(0),
+      mnMaximalWidth(0)
+{
+    try
+    {
+        // Get the content window via the pane anchor.
+        Reference<XControllerManager> xCM (rxController, UNO_QUERY_THROW);
+        Reference<XConfigurationController> xCC (
+            xCM->getConfigurationController(), UNO_SET_THROW);
+        mxPane.set(xCC->getResource(rxViewId->getAnchor()), UNO_QUERY_THROW);
+
+        mxWindow = mxPane->getWindow();
+        ProvideCanvas();
+
+        mxWindow->addWindowListener(this);
+        mxWindow->addPaintListener(this);
+        Reference<awt::XWindowPeer> xPeer (mxWindow, UNO_QUERY);
+        if (xPeer.is())
+            xPeer->setBackground(util::Color(0xff000000));
+        mxWindow->setVisible(true);
+
+        if (mpPresenterController.is())
+        {
+            mpFont = mpPresenterController->GetViewFont(mxViewId->getResourceURL());
+            if (mpFont.get() != nullptr)
+            {
+                mpFont->PrepareFont(mxCanvas);
+            }
+        }
+
+        // Create the close button.
+        mpCloseButton = PresenterButton::Create(
+            mxComponentContext,
+            mpPresenterController,
+            mpPresenterController->GetTheme(),
+            mxWindow,
+            mxCanvas,
+            "HelpViewCloser");
+
+        ReadHelpStrings();
+        Resize();
+    }
+    catch (RuntimeException&)
+    {
+        mxViewId = nullptr;
+        mxWindow = nullptr;
+        throw;
+    }
+}
+
+PresenterHelpView::~PresenterHelpView()
+{
+}
+
+void SAL_CALL PresenterHelpView::disposing()
+{
+    mxViewId = nullptr;
+
+    if (mpCloseButton.is())
+    {
+        Reference<lang::XComponent> xComponent (
+            static_cast<XWeak*>(mpCloseButton.get()), UNO_QUERY);
+        mpCloseButton = nullptr;
+        if (xComponent.is())
+            xComponent->dispose();
+    }
+
+    if (mxWindow.is())
+    {
+        mxWindow->removeWindowListener(this);
+        mxWindow->removePaintListener(this);
+    }
+}
+
+//----- lang::XEventListener --------------------------------------------------
+
+void SAL_CALL PresenterHelpView::disposing (const lang::EventObject& rEventObject)
+{
+    if (rEventObject.Source == mxCanvas)
+    {
+        mxCanvas = nullptr;
+    }
+    else if (rEventObject.Source == mxWindow)
+    {
+        mxWindow = nullptr;
+        dispose();
+    }
+}
+
+//----- XWindowListener -------------------------------------------------------
+
+void SAL_CALL PresenterHelpView::windowResized (const awt::WindowEvent&)
+{
+    ThrowIfDisposed();
+    Resize();
+}
+
+void SAL_CALL PresenterHelpView::windowMoved (const awt::WindowEvent&)
+{
+    ThrowIfDisposed();
+}
+
+void SAL_CALL PresenterHelpView::windowShown (const lang::EventObject&)
+{
+    ThrowIfDisposed();
+    Resize();
+}
+
+void SAL_CALL PresenterHelpView::windowHidden (const lang::EventObject&)
+{
+    ThrowIfDisposed();
+}
+
+//----- XPaintListener --------------------------------------------------------
+
+void SAL_CALL PresenterHelpView::windowPaint (const css::awt::PaintEvent& rEvent)
+{
+    Paint(rEvent.UpdateRect);
+}
+
+void PresenterHelpView::Paint (const awt::Rectangle& rUpdateBox)
+{
+    ProvideCanvas();
+    if ( ! mxCanvas.is())
+        return;
+
+    // Clear background.
+    const awt::Rectangle aWindowBox (mxWindow->getPosSize());
+    mpPresenterController->GetCanvasHelper()->Paint(
+        mpPresenterController->GetViewBackground(mxViewId->getResourceURL()),
+        mxCanvas,
+        rUpdateBox,
+        awt::Rectangle(0,0,aWindowBox.Width,aWindowBox.Height),
+        awt::Rectangle());
+
+    // Paint vertical divider.
+
+    rendering::ViewState aViewState(
+        geometry::AffineMatrix2D(1,0,0, 0,1,0),
+        PresenterGeometryHelper::CreatePolygon(rUpdateBox, mxCanvas->getDevice()));
+
+    rendering::RenderState aRenderState (
+        geometry::AffineMatrix2D(1,0,0, 0,1,0),
+        nullptr,
+        Sequence<double>(4),
+        rendering::CompositeOperation::SOURCE);
+    PresenterCanvasHelper::SetDeviceColor(aRenderState, mpFont->mnColor);
+
+    mxCanvas->drawLine(
+            geometry::RealPoint2D((aWindowBox.Width/2.0), gnVerticalBorder),
+            geometry::RealPoint2D((aWindowBox.Width/2.0), mnSeparatorY - gnVerticalBorder),
+        aViewState,
+        aRenderState);
+
+    // Paint the horizontal separator.
+    mxCanvas->drawLine(
+        geometry::RealPoint2D(0, mnSeparatorY),
+        geometry::RealPoint2D(aWindowBox.Width, mnSeparatorY),
+        aViewState,
+        aRenderState);
+
+    // Paint text.
+    double nY (gnVerticalBorder);
+    for (const auto& rxBlock : *mpTextContainer)
+    {
+        sal_Int32 LeftX1 = gnHorizontalGap;
+        sal_Int32 LeftX2 = aWindowBox.Width/2 - gnHorizontalGap;
+        sal_Int32 RightX1 = aWindowBox.Width/2 + gnHorizontalGap;
+        sal_Int32 RightX2 = aWindowBox.Width - gnHorizontalGap;
+        /* check whether RTL interface or not
+           then replace the windowbox position */
+        if(AllSettings::GetLayoutRTL())
+        {
+            LeftX1 = aWindowBox.Width/2 + gnHorizontalGap;
+            LeftX2 = aWindowBox.Width - gnHorizontalGap;
+            RightX1 = gnHorizontalGap;
+            RightX2 = aWindowBox.Width/2 - gnHorizontalGap;
+        }
+        const double nLeftHeight (
+            rxBlock->maLeft.Paint(mxCanvas,
+                geometry::RealRectangle2D(
+                        LeftX1,
+                        nY,
+                        LeftX2,
+                        aWindowBox.Height - gnVerticalBorder),
+                false,
+                aViewState,
+                aRenderState,
+                mpFont->mxFont));
+        const double nRightHeight (
+            rxBlock->maRight.Paint(mxCanvas,
+                geometry::RealRectangle2D(
+                        RightX1,
+                        nY,
+                        RightX2,
+                        aWindowBox.Height - gnVerticalBorder),
+                true,
+                aViewState,
+                aRenderState,
+                mpFont->mxFont));
+
+        nY += ::std::max(nLeftHeight,nRightHeight);
+    }
+
+    Reference<rendering::XSpriteCanvas> xSpriteCanvas (mxCanvas, UNO_QUERY);
+    if (xSpriteCanvas.is())
+        xSpriteCanvas->updateScreen(false);
+}
+
+void PresenterHelpView::ReadHelpStrings()
+{
+    mpTextContainer.reset(new TextContainer);
+    PresenterConfigurationAccess aConfiguration (
+        mxComponentContext,
+        "/org.openoffice.Office.PresenterScreen/",
+        PresenterConfigurationAccess::READ_ONLY);
+    Reference<container::XNameAccess> xStrings (
+        aConfiguration.GetConfigurationNode("PresenterScreenSettings/HelpView/HelpStrings"),
+        UNO_QUERY);
+    PresenterConfigurationAccess::ForAll(
+        xStrings,
+        [this](OUString const&, uno::Reference<beans::XPropertySet> const& xProps)
+        {
+            return this->ProcessString(xProps);
+        });
+}
+
+void PresenterHelpView::ProcessString (
+    const Reference<beans::XPropertySet>& rsProperties)
+{
+    if ( ! rsProperties.is())
+        return;
+
+    OUString sLeftText;
+    PresenterConfigurationAccess::GetProperty(rsProperties, "Left") >>= sLeftText;
+    OUString sRightText;
+    PresenterConfigurationAccess::GetProperty(rsProperties, "Right") >>= sRightText;
+    mpTextContainer->push_back(
+        std::make_shared<Block>(
+            sLeftText, sRightText, mpFont->mxFont, mnMaximalWidth));
+}
+
+void PresenterHelpView::CheckFontSize()
+{
+    if (mpFont.get() == nullptr)
+        return;
+
+    sal_Int32 nBestSize (6);
+
+    // Scaling down and then reformatting can cause the text to be too large
+    // still.  So do this again and again until the text size is
+    // small enough.  Restrict the number of loops.
+    for (int nLoopCount=0; nLoopCount<5; ++nLoopCount)
+    {
+        double nY = std::accumulate(mpTextContainer->begin(), mpTextContainer->end(), double(0),
+            [](const double& sum, const std::shared_ptr<Block>& rxBlock) {
+                return sum + std::max(
+                    rxBlock->maLeft.GetHeight(),
+                    rxBlock->maRight.GetHeight());
+            });
+
+        const double nHeightDifference (nY - (mnSeparatorY-gnVerticalBorder));
+        if (nHeightDifference <= 0 && nHeightDifference > -50)
+        {
+            // We have found a good font size that is large and leaves not
+            // too much space below the help text.
+            return;
+        }
+
+        // Use a simple linear transformation to calculate initial guess of
+        // a size that lets all help text be shown inside the window.
+        const double nScale (double(mnSeparatorY-gnVerticalBorder) / nY);
+        if (nScale > 1.0 && nScale < 1.05)
+            break;
+
+        sal_Int32 nFontSizeGuess (sal_Int32(mpFont->mnSize * nScale));
+        if (nHeightDifference<=0 && mpFont->mnSize>nBestSize)
+            nBestSize = mpFont->mnSize;
+        mpFont->mnSize = nFontSizeGuess;
+        mpFont->mxFont = nullptr;
+        mpFont->PrepareFont(mxCanvas);
+
+        // Reformat blocks.
+        for (auto& rxBlock : *mpTextContainer)
+            rxBlock->Update(mpFont->mxFont, mnMaximalWidth);
+    }
+
+    if (nBestSize != mpFont->mnSize)
+    {
+        mpFont->mnSize = nBestSize;
+        mpFont->mxFont = nullptr;
+        mpFont->PrepareFont(mxCanvas);
+
+        // Reformat blocks.
+        for (auto& rxBlock : *mpTextContainer)
+        {
+            rxBlock->Update(mpFont->mxFont, mnMaximalWidth);
+        }
+    }
+}
+
+//----- XResourceId -----------------------------------------------------------
+
+Reference<XResourceId> SAL_CALL PresenterHelpView::getResourceId()
+{
+    ThrowIfDisposed();
+    return mxViewId;
+}
+
+sal_Bool SAL_CALL PresenterHelpView::isAnchorOnly()
+{
+    return false;
+}
+
+
+void PresenterHelpView::ProvideCanvas()
+{
+    if ( ! mxCanvas.is() && mxPane.is())
+    {
+        mxCanvas = mxPane->getCanvas();
+        if ( ! mxCanvas.is())
+            return;
+        Reference<lang::XComponent> xComponent (mxCanvas, UNO_QUERY);
+        if (xComponent.is())
+            xComponent->addEventListener(static_cast<awt::XPaintListener*>(this));
+
+        if (mpCloseButton.is())
+            mpCloseButton->SetCanvas(mxCanvas, mxWindow);
+    }
+}
+
+void PresenterHelpView::Resize()
+{
+    if (!(mpCloseButton.get() != nullptr && mxWindow.is()))
+        return;
+
+    const awt::Rectangle aWindowBox (mxWindow->getPosSize());
+    mnMaximalWidth = (mxWindow->getPosSize().Width - 4*gnHorizontalGap) / 2;
+
+    // Place vertical separator.
+    mnSeparatorY = aWindowBox.Height
+        - mpCloseButton->GetSize().Height - gnVerticalButtonPadding;
+
+    mpCloseButton->SetCenter(geometry::RealPoint2D(
+        aWindowBox.Width/2.0,
+        aWindowBox.Height - mpCloseButton->GetSize().Height/2.0));
+
+    CheckFontSize();
+}
+
+void PresenterHelpView::ThrowIfDisposed()
+{
+    if (rBHelper.bDisposed || rBHelper.bInDispose)
+    {
+        throw lang::DisposedException (
+            "PresenterHelpView has been already disposed",
+            static_cast<uno::XWeak*>(this));
+    }
+}
+
+//===== LineDescriptor =========================================================
+
+namespace {
+
+LineDescriptor::LineDescriptor()
+    : msLine(),
+      maSize(0,0),
+      mnVerticalOffset(0)
+{
+}
+
+void LineDescriptor::AddPart (
+    const OUString& rsLine,
+    const css::uno::Reference<css::rendering::XCanvasFont>& rxFont)
+{
+    msLine += rsLine;
+
+    CalculateSize(rxFont);
+}
+
+bool LineDescriptor::IsEmpty() const
+{
+    return msLine.isEmpty();
+}
+
+void LineDescriptor::CalculateSize (
+    const css::uno::Reference<css::rendering::XCanvasFont>& rxFont)
+{
+    OSL_ASSERT(rxFont.is());
+
+    rendering::StringContext aContext (msLine, 0, msLine.getLength());
+    Reference<rendering::XTextLayout> xLayout (
+        rxFont->createTextLayout(aContext, rendering::TextDirection::WEAK_LEFT_TO_RIGHT, 0));
+    const geometry::RealRectangle2D aTextBBox (xLayout->queryTextBounds());
+    maSize = css::geometry::RealSize2D(aTextBBox.X2 - aTextBBox.X1, aTextBBox.Y2 - aTextBBox.Y1);
+    mnVerticalOffset = aTextBBox.Y2;
+}
+
+} // end of anonymous namespace
+
+//===== LineDescriptorList ====================================================
+
+namespace {
+
+LineDescriptorList::LineDescriptorList (
+    const OUString& rsText,
+    const css::uno::Reference<css::rendering::XCanvasFont>& rxFont,
+    const sal_Int32 nMaximalWidth)
+    : msText(rsText)
+{
+    Update(rxFont, nMaximalWidth);
+}
+
+double LineDescriptorList::Paint(
+    const Reference<rendering::XCanvas>& rxCanvas,
+    const geometry::RealRectangle2D& rBBox,
+    const bool bFlushLeft,
+    const rendering::ViewState& rViewState,
+    rendering::RenderState& rRenderState,
+    const css::uno::Reference<css::rendering::XCanvasFont>& rxFont) const
+{
+    if ( ! rxCanvas.is())
+        return 0;
+
+    double nY (rBBox.Y1);
+    for (const auto& rLine : *mpLineDescriptors)
+    {
+        double nX;
+        /// check whether RTL interface or not
+        if(!AllSettings::GetLayoutRTL())
+        {
+            nX = rBBox.X1;
+            if ( ! bFlushLeft)
+                nX = rBBox.X2 - rLine.maSize.Width;
+        }
+        else
+        {
+            nX=rBBox.X2 - rLine.maSize.Width;
+            if ( ! bFlushLeft)
+                nX = rBBox.X1;
+        }
+        rRenderState.AffineTransform.m02 = nX;
+        rRenderState.AffineTransform.m12 = nY + rLine.maSize.Height - rLine.mnVerticalOffset;
+
+        const rendering::StringContext aContext (rLine.msLine, 0, rLine.msLine.getLength());
+        Reference<rendering::XTextLayout> xLayout (
+        rxFont->createTextLayout(aContext, rendering::TextDirection::WEAK_LEFT_TO_RIGHT, 0));
+        rxCanvas->drawTextLayout (
+            xLayout,
+            rViewState,
+            rRenderState);
+
+        nY += rLine.maSize.Height * 1.2;
+    }
+
+    return nY - rBBox.Y1;
+}
+
+double LineDescriptorList::GetHeight() const
+{
+    return std::accumulate(mpLineDescriptors->begin(), mpLineDescriptors->end(), double(0),
+        [](const double& nHeight, const LineDescriptor& rLine) {
+            return nHeight + rLine.maSize.Height * 1.2;
+        });
+}
+
+void LineDescriptorList::Update (
+    const css::uno::Reference<css::rendering::XCanvasFont>& rxFont,
+    const sal_Int32 nMaximalWidth)
+{
+    vector<OUString> aTextParts;
+    SplitText(msText, aTextParts);
+    FormatText(aTextParts, rxFont, nMaximalWidth);
+}
+
+void LineDescriptorList::SplitText (
+    const OUString& rsText,
+    vector<OUString>& rTextParts)
+{
+    const char cQuote ('\'');
+    const char cSeparator (',');
+
+    sal_Int32 nIndex (0);
+    sal_Int32 nStart (0);
+    sal_Int32 nLength (rsText.getLength());
+    bool bIsQuoted (false);
+    while (nIndex < nLength)
+    {
+        const sal_Int32 nQuoteIndex (rsText.indexOf(cQuote, nIndex));
+        const sal_Int32 nSeparatorIndex (rsText.indexOf(cSeparator, nIndex));
+        if (nQuoteIndex>=0 && (nSeparatorIndex==-1 || nQuoteIndex<nSeparatorIndex))
+        {
+            bIsQuoted = !bIsQuoted;
+            nIndex = nQuoteIndex+1;
+            continue;
+        }
+
+        const sal_Int32 nNextIndex = nSeparatorIndex;
+        if (nNextIndex < 0)
+        {
+            break;
+        }
+        else if ( ! bIsQuoted)
+        {
+            rTextParts.push_back(rsText.copy(nStart, nNextIndex-nStart));
+            nStart = nNextIndex + 1;
+        }
+        nIndex = nNextIndex+1;
+    }
+    if (nStart < nLength)
+        rTextParts.push_back(rsText.copy(nStart, nLength-nStart));
+}
+
+void LineDescriptorList::FormatText (
+    const vector<OUString>& rTextParts,
+    const css::uno::Reference<css::rendering::XCanvasFont>& rxFont,
+    const sal_Int32 nMaximalWidth)
+{
+    LineDescriptor aLineDescriptor;
+
+    mpLineDescriptors = std::make_shared<vector<LineDescriptor>>();
+
+    vector<OUString>::const_iterator iPart (rTextParts.begin());
+    vector<OUString>::const_iterator iEnd (rTextParts.end());
+    while (iPart!=iEnd)
+    {
+        if (aLineDescriptor.IsEmpty())
+        {
+            // Avoid empty lines.
+            if (PresenterCanvasHelper::GetTextSize(
+                rxFont, *iPart).Width > nMaximalWidth)
+            {
+                const char cSpace (' ');
+
+                sal_Int32 nIndex (0);
+                sal_Int32 nStart (0);
+                sal_Int32 nLength (iPart->getLength());
+                while (nIndex < nLength)
+                {
+                    sal_Int32  nSpaceIndex (iPart->indexOf(cSpace, nIndex));
+                    while (nSpaceIndex >= 0 && PresenterCanvasHelper::GetTextSize(
+                        rxFont, iPart->copy(nStart, nSpaceIndex-nStart)).Width <= nMaximalWidth)
+                    {
+                        nIndex = nSpaceIndex;
+                        nSpaceIndex = iPart->indexOf(cSpace, nIndex+1);
+                    }
+
+                    if (nSpaceIndex < 0 && PresenterCanvasHelper::GetTextSize(
+                        rxFont, iPart->copy(nStart, nLength-nStart)).Width <= nMaximalWidth)
+                    {
+                        nIndex = nLength;
+                    }
+
+                    if (nIndex == nStart)
+                    {
+                        nIndex = nLength;
+                    }
+
+                    aLineDescriptor.AddPart(iPart->copy(nStart, nIndex-nStart), rxFont);
+                    if (nIndex != nLength)
+                    {
+                        mpLineDescriptors->push_back(aLineDescriptor);
+                        aLineDescriptor = LineDescriptor();
+                    }
+                    nStart = nIndex;
+                }
+            }
+            else
+            {
+                aLineDescriptor.AddPart(*iPart, rxFont);
+            }
+        }
+        else if (PresenterCanvasHelper::GetTextSize(
+            rxFont, aLineDescriptor.msLine+", "+*iPart).Width > nMaximalWidth)
+        {
+            aLineDescriptor.AddPart(",", rxFont);
+            mpLineDescriptors->push_back(aLineDescriptor);
+            aLineDescriptor = LineDescriptor();
+            continue;
+        }
+        else
+        {
+            aLineDescriptor.AddPart(", "+*iPart, rxFont);
+        }
+        ++iPart;
+    }
+    if ( ! aLineDescriptor.IsEmpty())
+    {
+        mpLineDescriptors->push_back(aLineDescriptor);
+    }
+}
+
+} // end of anonymous namespace
+
+//===== Block =================================================================
+
+namespace {
+
+Block::Block (
+    const OUString& rsLeftText,
+    const OUString& rsRightText,
+    const css::uno::Reference<css::rendering::XCanvasFont>& rxFont,
+    const sal_Int32 nMaximalWidth)
+    : maLeft(rsLeftText, rxFont, nMaximalWidth),
+      maRight(rsRightText, rxFont, nMaximalWidth)
+{
+}
+
+void Block::Update (
+    const css::uno::Reference<css::rendering::XCanvasFont>& rxFont,
+    const sal_Int32 nMaximalWidth)
+{
+    maLeft.Update(rxFont, nMaximalWidth);
+    maRight.Update(rxFont, nMaximalWidth);
+}
+
+} // end of anonymous namespace
+
+} // end of namespace ::sdext::presenter
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */