Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

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

1 files changed, 1192 insertions, 0 deletions

diff --git a/sdext/source/presenter/PresenterTextView.cxx b/sdext/source/presenter/PresenterTextView.cxx
new file mode 100644
index 000000000..d83229b88
--- /dev/null
+++ b/sdext/source/presenter/PresenterTextView.cxx
@@ -0,0 +1,1192 @@
+/* -*- 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 "PresenterTextView.hxx"
+#include "PresenterCanvasHelper.hxx"
+#include "PresenterGeometryHelper.hxx"
+#include "PresenterTimer.hxx"
+
+#include <algorithm>
+#include <cmath>
+#include <numeric>
+
+#include <com/sun/star/accessibility/AccessibleTextType.hpp>
+#include <com/sun/star/container/XEnumerationAccess.hpp>
+#include <com/sun/star/i18n/BreakIterator.hpp>
+#include <com/sun/star/i18n/CharacterIteratorMode.hpp>
+#include <com/sun/star/i18n/ScriptDirection.hpp>
+#include <com/sun/star/i18n/WordType.hpp>
+#include <com/sun/star/rendering/CompositeOperation.hpp>
+#include <com/sun/star/rendering/TextDirection.hpp>
+#include <com/sun/star/text/WritingMode2.hpp>
+#include <o3tl/safeint.hxx>
+#include <tools/diagnose_ex.h>
+
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::accessibility;
+using namespace ::com::sun::star::uno;
+
+const sal_Int64 CaretBlinkInterval = 500 * 1000 * 1000;
+
+//#define SHOW_CHARACTER_BOXES
+
+namespace {
+    sal_Int32 Signum (const sal_Int32 nValue)
+    {
+        if (nValue < 0)
+            return -1;
+        else if (nValue > 0)
+            return +1;
+        else
+            return 0;
+    }
+}
+
+namespace sdext::presenter {
+
+//===== PresenterTextView =====================================================
+
+PresenterTextView::PresenterTextView (
+    const Reference<XComponentContext>& rxContext,
+    const Reference<rendering::XCanvas>& rxCanvas,
+    const ::std::function<void (const css::awt::Rectangle&)>& rInvalidator)
+    : mxCanvas(rxCanvas),
+      maLocation(0,0),
+      maSize(0,0),
+      mpCaret(std::make_shared<PresenterTextCaret>(
+          rxContext,
+          [this] (sal_Int32 const nParagraphIndex, sal_Int32 const nCharacterIndex)
+              { return this->GetCaretBounds(nParagraphIndex, nCharacterIndex); },
+          rInvalidator)),
+      mnLeftOffset(0),
+      mnTopOffset(0),
+      mbIsFormatPending(false)
+{
+    Reference<lang::XMultiComponentFactory> xFactory =
+        rxContext->getServiceManager();
+    if ( ! xFactory.is())
+        return;
+
+    // Create the break iterator that we use to break text into lines.
+    mxBreakIterator = i18n::BreakIterator::create(rxContext);
+
+    // Create the script type detector that is used to split paragraphs into
+    // portions of the same text direction.
+    mxScriptTypeDetector.set(
+        xFactory->createInstanceWithContext(
+            "com.sun.star.i18n.ScriptTypeDetector",
+            rxContext),
+        UNO_QUERY_THROW);
+}
+
+void PresenterTextView::SetText (const Reference<text::XText>& rxText)
+{
+    maParagraphs.clear();
+
+    Reference<container::XEnumerationAccess> xParagraphAccess (rxText, UNO_QUERY);
+    if ( ! xParagraphAccess.is())
+        return;
+
+    Reference<container::XEnumeration> xParagraphs =
+        xParagraphAccess->createEnumeration();
+    if ( ! xParagraphs.is())
+        return;
+
+    if ( ! mpFont || ! mpFont->PrepareFont(mxCanvas))
+        return;
+
+    sal_Int32 nCharacterCount (0);
+    while (xParagraphs->hasMoreElements())
+    {
+        SharedPresenterTextParagraph pParagraph = std::make_shared<PresenterTextParagraph>(
+            maParagraphs.size(),
+            mxBreakIterator,
+            mxScriptTypeDetector,
+            Reference<text::XTextRange>(xParagraphs->nextElement(), UNO_QUERY),
+            mpCaret);
+        pParagraph->SetupCellArray(mpFont);
+        pParagraph->SetCharacterOffset(nCharacterCount);
+        nCharacterCount += pParagraph->GetCharacterCount();
+        maParagraphs.push_back(pParagraph);
+    }
+
+    if (mpCaret)
+        mpCaret->HideCaret();
+
+    RequestFormat();
+}
+
+void PresenterTextView::SetTextChangeBroadcaster (
+    const ::std::function<void ()>& rBroadcaster)
+{
+    maTextChangeBroadcaster = rBroadcaster;
+}
+
+void PresenterTextView::SetLocation (const css::geometry::RealPoint2D& rLocation)
+{
+    maLocation = rLocation;
+
+    for (auto& rxParagraph : maParagraphs)
+    {
+        rxParagraph->SetOrigin(
+            maLocation.X - mnLeftOffset,
+            maLocation.Y - mnTopOffset);
+    }
+}
+
+void PresenterTextView::SetSize (const css::geometry::RealSize2D& rSize)
+{
+    maSize = rSize;
+    RequestFormat();
+}
+
+double PresenterTextView::GetTotalTextHeight()
+{
+    if (mbIsFormatPending)
+    {
+        if ( ! mpFont->PrepareFont(mxCanvas))
+            return 0;
+        Format();
+    }
+
+    return std::accumulate(maParagraphs.begin(), maParagraphs.end(), double(0),
+        [](const double& nTotalHeight, const SharedPresenterTextParagraph& rxParagraph) {
+            return nTotalHeight + rxParagraph->GetTotalTextHeight();
+        });
+}
+
+void PresenterTextView::SetFont (const PresenterTheme::SharedFontDescriptor& rpFont)
+{
+    mpFont = rpFont;
+    RequestFormat();
+}
+
+void PresenterTextView::SetOffset(
+    const double nLeft,
+    const double nTop)
+{
+    mnLeftOffset = nLeft;
+    mnTopOffset = nTop;
+
+    // Trigger an update of the text origin stored at the individual paragraphs.
+    SetLocation(maLocation);
+}
+
+void PresenterTextView::MoveCaret (
+    const sal_Int32 nDistance,
+    const sal_Int16 nTextType)
+{
+    if ( ! mpCaret)
+        return;
+
+    // When the caret has not been visible yet then move it to the beginning
+    // of the text.
+    if (mpCaret->GetParagraphIndex() < 0)
+    {
+        mpCaret->SetPosition(0,0);
+        return;
+    }
+
+    sal_Int32 nParagraphIndex (mpCaret->GetParagraphIndex());
+    sal_Int32 nCharacterIndex (mpCaret->GetCharacterIndex());
+    switch (nTextType)
+    {
+        default:
+        case AccessibleTextType::CHARACTER:
+            nCharacterIndex += nDistance;
+            break;
+
+        case AccessibleTextType::WORD:
+        {
+            sal_Int32 nRemainingDistance (nDistance);
+            while (nRemainingDistance != 0)
+            {
+                SharedPresenterTextParagraph pParagraph (GetParagraph(nParagraphIndex));
+                if (pParagraph)
+                {
+                    const sal_Int32 nDelta (Signum(nDistance));
+                    nCharacterIndex = pParagraph->GetWordBoundary(nCharacterIndex, nDelta);
+                    if (nCharacterIndex < 0)
+                    {
+                        // Go to previous or next paragraph.
+                        nParagraphIndex += nDelta;
+                        if (nParagraphIndex < 0)
+                        {
+                            nParagraphIndex = 0;
+                            nCharacterIndex = 0;
+                            nRemainingDistance = 0;
+                        }
+                        else if (o3tl::make_unsigned(nParagraphIndex) >= maParagraphs.size())
+                        {
+                            nParagraphIndex = maParagraphs.size()-1;
+                            pParagraph = GetParagraph(nParagraphIndex);
+                            if (pParagraph)
+                                nCharacterIndex = pParagraph->GetCharacterCount();
+                            nRemainingDistance = 0;
+                        }
+                        else
+                        {
+                            nRemainingDistance -= nDelta;
+
+                            // Move caret one character to the end of
+                            // the previous or the start of the next paragraph.
+                            pParagraph = GetParagraph(nParagraphIndex);
+                            if (pParagraph)
+                            {
+                                if (nDistance<0)
+                                    nCharacterIndex = pParagraph->GetCharacterCount();
+                                else
+                                    nCharacterIndex = 0;
+                            }
+                        }
+                    }
+                    else
+                        nRemainingDistance -= nDelta;
+                }
+                else
+                    break;
+            }
+            break;
+        }
+    }
+
+    // Move the caret to the new position.
+    mpCaret->SetPosition(nParagraphIndex, nCharacterIndex);
+}
+
+void PresenterTextView::Paint (
+    const css::awt::Rectangle& rUpdateBox)
+{
+    if ( ! mxCanvas.is())
+        return;
+    if ( ! mpFont->PrepareFont(mxCanvas))
+        return;
+
+    if (mbIsFormatPending)
+        Format();
+
+    // Setup the clipping rectangle.  Horizontally we make it a little
+    // larger to allow characters (and the caret) to stick out of their
+    // bounding boxes.  This can happen on some characters (like the
+    // uppercase J) for typographical reasons.
+    const sal_Int32 nAdditionalLeftBorder (10);
+    const sal_Int32 nAdditionalRightBorder (5);
+    double nX (maLocation.X - mnLeftOffset);
+    double nY (maLocation.Y - mnTopOffset);
+    const sal_Int32 nClipLeft (::std::max(
+        PresenterGeometryHelper::Round(maLocation.X)-nAdditionalLeftBorder, rUpdateBox.X));
+    const sal_Int32 nClipTop (::std::max(
+        PresenterGeometryHelper::Round(maLocation.Y), rUpdateBox.Y));
+    const sal_Int32 nClipRight (::std::min(
+        PresenterGeometryHelper::Round(maLocation.X+maSize.Width)+nAdditionalRightBorder, rUpdateBox.X+rUpdateBox.Width));
+    const sal_Int32 nClipBottom (::std::min(
+        PresenterGeometryHelper::Round(maLocation.Y+maSize.Height), rUpdateBox.Y+rUpdateBox.Height));
+    if (nClipLeft>=nClipRight || nClipTop>=nClipBottom)
+        return;
+
+    const awt::Rectangle aClipBox(
+        nClipLeft,
+        nClipTop,
+        nClipRight - nClipLeft,
+        nClipBottom - nClipTop);
+    Reference<rendering::XPolyPolygon2D> xClipPolygon (
+        PresenterGeometryHelper::CreatePolygon(aClipBox, mxCanvas->getDevice()));
+
+    const rendering::ViewState aViewState(
+        geometry::AffineMatrix2D(1,0,0, 0,1,0),
+        xClipPolygon);
+
+    rendering::RenderState aRenderState (
+        geometry::AffineMatrix2D(1,0,nX, 0,1,nY),
+        nullptr,
+        Sequence<double>(4),
+        rendering::CompositeOperation::SOURCE);
+    PresenterCanvasHelper::SetDeviceColor(aRenderState, mpFont->mnColor);
+
+    for (const auto& rxParagraph : maParagraphs)
+    {
+        rxParagraph->Paint(
+            mxCanvas,
+            maSize,
+            mpFont,
+            aViewState,
+            aRenderState,
+            mnTopOffset,
+            nClipTop,
+            nClipBottom);
+    }
+
+    aRenderState.AffineTransform.m02 = 0;
+    aRenderState.AffineTransform.m12 = 0;
+
+#ifdef SHOW_CHARACTER_BOXES
+    PresenterCanvasHelper::SetDeviceColor(aRenderState, 0x00808080);
+    for (sal_Int32 nParagraphIndex(0), nParagraphCount(GetParagraphCount());
+         nParagraphIndex<nParagraphCount;
+         ++nParagraphIndex)
+    {
+        const SharedPresenterTextParagraph pParagraph (GetParagraph(nParagraphIndex));
+        if ( ! pParagraph)
+            continue;
+        for (sal_Int32 nCharacterIndex(0),nCharacterCount(pParagraph->GetCharacterCount());
+             nCharacterIndex<nCharacterCount; ++nCharacterIndex)
+        {
+            const awt::Rectangle aBox (pParagraph->GetCharacterBounds(nCharacterIndex, false));
+            mxCanvas->drawPolyPolygon (
+                PresenterGeometryHelper::CreatePolygon(
+                    aBox,
+                    mxCanvas->getDevice()),
+                aViewState,
+                aRenderState);
+        }
+    }
+    PresenterCanvasHelper::SetDeviceColor(aRenderState, mpFont->mnColor);
+#endif
+
+    if (mpCaret && mpCaret->IsVisible())
+    {
+        mxCanvas->fillPolyPolygon (
+            PresenterGeometryHelper::CreatePolygon(
+                mpCaret->GetBounds(),
+                mxCanvas->getDevice()),
+            aViewState,
+            aRenderState);
+    }
+}
+
+const SharedPresenterTextCaret& PresenterTextView::GetCaret() const
+{
+    return mpCaret;
+}
+
+awt::Rectangle PresenterTextView::GetCaretBounds (
+    sal_Int32 nParagraphIndex,
+    const sal_Int32 nCharacterIndex) const
+{
+    SharedPresenterTextParagraph pParagraph (GetParagraph(nParagraphIndex));
+
+    if (pParagraph)
+        return pParagraph->GetCharacterBounds(nCharacterIndex, true);
+    else
+        return awt::Rectangle(0,0,0,0);
+}
+
+//----- private ---------------------------------------------------------------
+
+void PresenterTextView::RequestFormat()
+{
+    mbIsFormatPending = true;
+}
+
+void PresenterTextView::Format()
+{
+    mbIsFormatPending = false;
+
+    double nY (0);
+    for (const auto& rxParagraph : maParagraphs)
+    {
+        rxParagraph->Format(nY, maSize.Width, mpFont);
+        nY += rxParagraph->GetTotalTextHeight();
+    }
+
+    if (maTextChangeBroadcaster)
+        maTextChangeBroadcaster();
+}
+
+sal_Int32 PresenterTextView::GetParagraphCount() const
+{
+    return maParagraphs.size();
+}
+
+SharedPresenterTextParagraph PresenterTextView::GetParagraph (
+    const sal_Int32 nParagraphIndex) const
+{
+    if (nParagraphIndex < 0)
+        return SharedPresenterTextParagraph();
+    else if (o3tl::make_unsigned(nParagraphIndex)>=maParagraphs.size())
+        return SharedPresenterTextParagraph();
+    else
+        return maParagraphs[nParagraphIndex];
+}
+
+//===== PresenterTextParagraph ================================================
+
+PresenterTextParagraph::PresenterTextParagraph (
+    const sal_Int32 nParagraphIndex,
+    const Reference<i18n::XBreakIterator>& rxBreakIterator,
+    const Reference<i18n::XScriptTypeDetector>& rxScriptTypeDetector,
+    const Reference<text::XTextRange>& rxTextRange,
+    const SharedPresenterTextCaret& rpCaret)
+    : mnParagraphIndex(nParagraphIndex),
+      mpCaret(rpCaret),
+      mxBreakIterator(rxBreakIterator),
+      mxScriptTypeDetector(rxScriptTypeDetector),
+      mnVerticalOffset(0),
+      mnXOrigin(0),
+      mnYOrigin(0),
+      mnWidth(0),
+      mnAscent(0),
+      mnDescent(0),
+      mnLineHeight(-1),
+      mnWritingMode (text::WritingMode2::LR_TB),
+      mnCharacterOffset(0)
+{
+    if (!rxTextRange.is())
+        return;
+
+    Reference<beans::XPropertySet> xProperties (rxTextRange, UNO_QUERY);
+    try
+    {
+        xProperties->getPropertyValue("WritingMode") >>= mnWritingMode;
+    }
+    catch(beans::UnknownPropertyException&)
+    {
+        // Ignore the exception.  Use the default value.
+    }
+
+    msParagraphText = rxTextRange->getString();
+}
+
+void PresenterTextParagraph::Paint (
+    const Reference<rendering::XCanvas>& rxCanvas,
+    const geometry::RealSize2D& rSize,
+    const PresenterTheme::SharedFontDescriptor& rpFont,
+    const rendering::ViewState& rViewState,
+    rendering::RenderState& rRenderState,
+    const double nTopOffset,
+    const double nClipTop,
+    const double nClipBottom)
+{
+    if (mnLineHeight <= 0)
+        return;
+
+    sal_Int8 nTextDirection (GetTextDirection());
+
+    const double nSavedM12 (rRenderState.AffineTransform.m12);
+
+    if ( ! IsTextReferencePointLeft())
+        rRenderState.AffineTransform.m02 += rSize.Width;
+
+#ifdef SHOW_CHARACTER_BOXES
+    for (sal_Int32 nIndex=0,nCount=maLines.size();
+         nIndex<nCount;
+         ++nIndex)
+    {
+        Line& rLine (maLines[nIndex]);
+        rLine.ProvideLayoutedLine(msParagraphText, rpFont, nTextDirection);
+    }
+#endif
+
+    for (sal_Int32 nIndex=0,nCount=maLines.size();
+         nIndex<nCount;
+         ++nIndex, rRenderState.AffineTransform.m12 += mnLineHeight)
+    {
+        Line& rLine (maLines[nIndex]);
+
+        // Paint only visible lines.
+        const double nLineTop = rLine.mnBaseLine - mnAscent - nTopOffset;
+        if (nLineTop + mnLineHeight< nClipTop)
+            continue;
+        else if (nLineTop > nClipBottom)
+            break;
+        rLine.ProvideLayoutedLine(msParagraphText, rpFont, nTextDirection);
+
+        rRenderState.AffineTransform.m12 = nSavedM12 + rLine.mnBaseLine;
+
+        rxCanvas->drawTextLayout (
+            rLine.mxLayoutedLine,
+            rViewState,
+            rRenderState);
+    }
+    rRenderState.AffineTransform.m12 = nSavedM12;
+
+    if ( ! IsTextReferencePointLeft())
+        rRenderState.AffineTransform.m02 -= rSize.Width;
+}
+
+void PresenterTextParagraph::Format (
+    const double nY,
+    const double nWidth,
+    const PresenterTheme::SharedFontDescriptor& rpFont)
+{
+    // Make sure that the text view is in a valid and sane state.
+    if ( ! mxBreakIterator.is() || ! mxScriptTypeDetector.is())
+        return;
+    if (nWidth<=0)
+        return;
+    if ( ! rpFont || ! rpFont->mxFont.is())
+        return;
+
+    sal_Int32 nPosition (0);
+
+    mnWidth = nWidth;
+    maLines.clear();
+    mnLineHeight = 0;
+    mnAscent = 0;
+    mnDescent = 0;
+    mnVerticalOffset = nY;
+    maWordBoundaries.clear();
+    maWordBoundaries.push_back(0);
+
+    const rendering::FontMetrics aMetrics (rpFont->mxFont->getFontMetrics());
+    mnAscent = aMetrics.Ascent;
+    mnDescent = aMetrics.Descent;
+    mnLineHeight = aMetrics.Ascent + aMetrics.Descent + aMetrics.ExternalLeading;
+    nPosition = 0;
+    i18n::Boundary aCurrentLine(0,0);
+    while (true)
+    {
+        const i18n::Boundary aWordBoundary = mxBreakIterator->nextWord(
+            msParagraphText,
+            nPosition,
+            lang::Locale(),
+            i18n::WordType::ANYWORD_IGNOREWHITESPACES);
+        AddWord(nWidth, aCurrentLine, aWordBoundary.startPos, rpFont);
+
+        // Remember the new word boundary for caret travelling by words.
+        // Prevent duplicates.
+        if (aWordBoundary.startPos > maWordBoundaries.back())
+            maWordBoundaries.push_back(aWordBoundary.startPos);
+
+        if (aWordBoundary.endPos>aWordBoundary.startPos)
+            AddWord(nWidth, aCurrentLine, aWordBoundary.endPos, rpFont);
+
+        if (aWordBoundary.startPos<0 || aWordBoundary.endPos<0)
+            break;
+        if (nPosition >= aWordBoundary.endPos)
+            break;
+        nPosition = aWordBoundary.endPos;
+    }
+
+    if (aCurrentLine.endPos>aCurrentLine.startPos)
+        AddLine(aCurrentLine);
+
+}
+
+sal_Int32 PresenterTextParagraph::GetWordBoundary(
+    const sal_Int32 nLocalCharacterIndex,
+    const sal_Int32 nDistance)
+{
+    OSL_ASSERT(nDistance==-1 || nDistance==+1);
+
+    if (nLocalCharacterIndex < 0)
+    {
+        // The caller asked for the start or end position of the paragraph.
+        if (nDistance < 0)
+            return 0;
+        else
+            return GetCharacterCount();
+    }
+
+    sal_Int32 nIndex (0);
+    for (sal_Int32 nCount (maWordBoundaries.size()); nIndex<nCount; ++nIndex)
+    {
+        if (maWordBoundaries[nIndex] >= nLocalCharacterIndex)
+        {
+            // When inside the word (not at its start or end) then
+            // first move to the start or end before going the previous or
+            // next word.
+            if (maWordBoundaries[nIndex] > nLocalCharacterIndex)
+                if (nDistance > 0)
+                    --nIndex;
+            break;
+        }
+    }
+
+    nIndex += nDistance;
+
+    if (nIndex < 0)
+        return -1;
+    else if (o3tl::make_unsigned(nIndex)>=maWordBoundaries.size())
+        return -1;
+    else
+        return maWordBoundaries[nIndex];
+}
+
+sal_Int32 PresenterTextParagraph::GetCaretPosition() const
+{
+    if (mpCaret && mpCaret->GetParagraphIndex()==mnParagraphIndex)
+        return mpCaret->GetCharacterIndex();
+    else
+        return -1;
+}
+
+void PresenterTextParagraph::SetCaretPosition (const sal_Int32 nPosition) const
+{
+    if (mpCaret && mpCaret->GetParagraphIndex()==mnParagraphIndex)
+        return mpCaret->SetPosition(mnParagraphIndex, nPosition);
+}
+
+void PresenterTextParagraph::SetOrigin (const double nXOrigin, const double nYOrigin)
+{
+    mnXOrigin = nXOrigin;
+    mnYOrigin = nYOrigin;
+}
+
+awt::Point PresenterTextParagraph::GetRelativeLocation() const
+{
+    return awt::Point(
+        sal_Int32(mnXOrigin),
+        sal_Int32(mnYOrigin + mnVerticalOffset));
+}
+
+awt::Size PresenterTextParagraph::GetSize() const
+{
+    return awt::Size(
+        sal_Int32(mnWidth),
+        sal_Int32(GetTotalTextHeight()));
+}
+
+void PresenterTextParagraph::AddWord (
+    const double nWidth,
+    i18n::Boundary& rCurrentLine,
+    const sal_Int32 nWordBoundary,
+    const PresenterTheme::SharedFontDescriptor& rpFont)
+{
+    sal_Int32 nLineStart (0);
+    if ( ! maLines.empty())
+        nLineStart = rCurrentLine.startPos;
+
+    const OUString sLineCandidate (
+        msParagraphText.copy(nLineStart, nWordBoundary-nLineStart));
+
+    css::geometry::RealRectangle2D aLineBox (
+        PresenterCanvasHelper::GetTextBoundingBox (
+            rpFont->mxFont,
+            sLineCandidate,
+            mnWritingMode));
+    const double nLineWidth (aLineBox.X2 - aLineBox.X1);
+
+    if (nLineWidth >= nWidth)
+    {
+        // Add new line with a single word (so far).
+        AddLine(rCurrentLine);
+    }
+    rCurrentLine.endPos = nWordBoundary;
+}
+
+void PresenterTextParagraph::AddLine (
+    i18n::Boundary& rCurrentLine)
+{
+    Line aLine (rCurrentLine.startPos, rCurrentLine.endPos);
+
+    // Find the start and end of the line with respect to cells.
+    if (!maLines.empty())
+    {
+        aLine.mnLineStartCellIndex = maLines.back().mnLineEndCellIndex;
+        aLine.mnBaseLine = maLines.back().mnBaseLine + mnLineHeight;
+    }
+    else
+    {
+        aLine.mnLineStartCellIndex = 0;
+        aLine.mnBaseLine = mnVerticalOffset + mnAscent;
+    }
+    sal_Int32 nCellIndex (aLine.mnLineStartCellIndex);
+    double nWidth (0);
+    for ( ; nCellIndex<sal_Int32(maCells.size()); ++nCellIndex)
+    {
+        const Cell& rCell (maCells[nCellIndex]);
+        if (rCell.mnCharacterIndex+rCell.mnCharacterCount > aLine.mnLineEndCharacterIndex)
+            break;
+        nWidth += rCell.mnCellWidth;
+    }
+    aLine.mnLineEndCellIndex = nCellIndex;
+    aLine.mnWidth = nWidth;
+
+    maLines.push_back(aLine);
+
+    rCurrentLine.startPos = rCurrentLine.endPos;
+}
+
+double PresenterTextParagraph::GetTotalTextHeight() const
+{
+    return maLines.size() * mnLineHeight;
+}
+
+void PresenterTextParagraph::SetCharacterOffset (const sal_Int32 nCharacterOffset)
+{
+    mnCharacterOffset = nCharacterOffset;
+}
+
+sal_Int32 PresenterTextParagraph::GetCharacterCount() const
+{
+    return msParagraphText.getLength();
+}
+
+sal_Unicode PresenterTextParagraph::GetCharacter (
+    const sal_Int32 nGlobalCharacterIndex) const
+{
+    if (nGlobalCharacterIndex<mnCharacterOffset
+        || nGlobalCharacterIndex>=mnCharacterOffset+msParagraphText.getLength())
+    {
+        return sal_Unicode();
+    }
+    else
+    {
+        return msParagraphText[nGlobalCharacterIndex - mnCharacterOffset];
+    }
+}
+
+const OUString& PresenterTextParagraph::GetText() const
+{
+    return msParagraphText;
+}
+
+TextSegment PresenterTextParagraph::GetTextSegment (
+    const sal_Int32 nOffset,
+    const sal_Int32 nIndex,
+    const sal_Int16 nTextType) const
+{
+    switch(nTextType)
+    {
+        case AccessibleTextType::PARAGRAPH:
+            return TextSegment(
+                msParagraphText,
+                mnCharacterOffset,
+                mnCharacterOffset+msParagraphText.getLength());
+
+        case AccessibleTextType::SENTENCE:
+            if (mxBreakIterator.is())
+            {
+                const sal_Int32 nStart (mxBreakIterator->beginOfSentence(
+                    msParagraphText, nIndex-mnCharacterOffset, lang::Locale()));
+                const sal_Int32 nEnd (mxBreakIterator->endOfSentence(
+                    msParagraphText, nIndex-mnCharacterOffset, lang::Locale()));
+                if (nStart < nEnd)
+                    return TextSegment(
+                        msParagraphText.copy(nStart, nEnd-nStart),
+                        nStart+mnCharacterOffset,
+                        nEnd+mnCharacterOffset);
+            }
+            break;
+
+        case AccessibleTextType::WORD:
+            if (mxBreakIterator.is())
+                return GetWordTextSegment(nOffset, nIndex);
+            break;
+
+        case AccessibleTextType::LINE:
+        {
+            auto iLine = std::find_if(maLines.begin(), maLines.end(),
+                [nIndex](const Line& rLine) { return nIndex < rLine.mnLineEndCharacterIndex; });
+            if (iLine != maLines.end())
+            {
+                return TextSegment(
+                    msParagraphText.copy(
+                        iLine->mnLineStartCharacterIndex,
+                        iLine->mnLineEndCharacterIndex - iLine->mnLineStartCharacterIndex),
+                    iLine->mnLineStartCharacterIndex,
+                    iLine->mnLineEndCharacterIndex);
+            }
+        }
+        break;
+
+        // Handle GLYPH and ATTRIBUTE_RUN like CHARACTER because we can not
+        // do better at the moment.
+        case AccessibleTextType::CHARACTER:
+        case AccessibleTextType::GLYPH:
+        case AccessibleTextType::ATTRIBUTE_RUN:
+            return CreateTextSegment(nIndex+nOffset, nIndex+nOffset+1);
+    }
+
+    return TextSegment(OUString(), 0,0);
+}
+
+TextSegment PresenterTextParagraph::GetWordTextSegment (
+    const sal_Int32 nOffset,
+    const sal_Int32 nIndex) const
+{
+    sal_Int32 nCurrentOffset (nOffset);
+    sal_Int32 nCurrentIndex (nIndex);
+
+    i18n::Boundary aWordBoundary;
+    if (nCurrentOffset == 0)
+        aWordBoundary = mxBreakIterator->getWordBoundary(
+            msParagraphText,
+            nIndex,
+            lang::Locale(),
+            i18n::WordType::ANYWORD_IGNOREWHITESPACES,
+            true);
+    else if (nCurrentOffset < 0)
+    {
+        while (nCurrentOffset<0 && nCurrentIndex>0)
+        {
+            aWordBoundary = mxBreakIterator->previousWord(
+                msParagraphText,
+                nCurrentIndex,
+                lang::Locale(),
+                i18n::WordType::ANYWORD_IGNOREWHITESPACES);
+            nCurrentIndex = aWordBoundary.startPos;
+            ++nCurrentOffset;
+        }
+    }
+    else
+    {
+        while (nCurrentOffset>0 && nCurrentIndex<=GetCharacterCount())
+        {
+            aWordBoundary = mxBreakIterator->nextWord(
+                msParagraphText,
+                nCurrentIndex,
+                lang::Locale(),
+                i18n::WordType::ANYWORD_IGNOREWHITESPACES);
+            nCurrentIndex = aWordBoundary.endPos;
+            --nCurrentOffset;
+        }
+    }
+
+    return CreateTextSegment(aWordBoundary.startPos, aWordBoundary.endPos);
+}
+
+TextSegment PresenterTextParagraph::CreateTextSegment (
+    sal_Int32 nStartIndex,
+    sal_Int32 nEndIndex) const
+{
+    if (nEndIndex <= nStartIndex)
+        return TextSegment(
+            OUString(),
+            nStartIndex,
+            nEndIndex);
+    else
+        return TextSegment(
+            msParagraphText.copy(nStartIndex, nEndIndex-nStartIndex),
+            nStartIndex,
+            nEndIndex);
+}
+
+awt::Rectangle PresenterTextParagraph::GetCharacterBounds (
+    sal_Int32 nGlobalCharacterIndex,
+    const bool bCaretBox)
+{
+    // Find the line that contains the requested character and accumulate
+    // the previous line heights.
+    double nX (mnXOrigin);
+    double nY (mnYOrigin + mnVerticalOffset + mnAscent);
+    const sal_Int8 nTextDirection (GetTextDirection());
+    for (sal_Int32 nLineIndex=0,nLineCount=maLines.size();
+         nLineIndex<nLineCount;
+         ++nLineIndex, nY+=mnLineHeight)
+    {
+        Line& rLine (maLines[nLineIndex]);
+        // Skip lines before the indexed character.
+        if (nGlobalCharacterIndex >= rLine.mnLineEndCharacterIndex)
+            // When in the last line then allow the index past the last char.
+            if (nLineIndex<nLineCount-1)
+                continue;
+
+        rLine.ProvideCellBoxes();
+
+        const sal_Int32 nCellIndex (nGlobalCharacterIndex - rLine.mnLineStartCharacterIndex);
+
+        // The cell bounding box is defined relative to the origin of
+        // the current line.  Therefore we have to add the absolute
+        // position of the line.
+        geometry::RealRectangle2D rCellBox (rLine.maCellBoxes[
+            ::std::min(nCellIndex, rLine.maCellBoxes.getLength()-1)]);
+
+        double nLeft = nX + rCellBox.X1;
+        double nRight = nX + rCellBox.X2;
+        if (nTextDirection == rendering::TextDirection::WEAK_RIGHT_TO_LEFT)
+        {
+            const double nOldRight (nRight);
+            nRight = rLine.mnWidth - nLeft;
+            nLeft = rLine.mnWidth - nOldRight;
+        }
+        double nTop = nY - mnAscent;
+        double nBottom;
+        if (bCaretBox)
+        {
+            nBottom = nTop + mnLineHeight;
+            if (nCellIndex >= rLine.maCellBoxes.getLength())
+                nLeft = nRight-2;
+            if (nLeft < nX)
+                nLeft = nX;
+            nRight = nLeft+2;
+        }
+        else
+        {
+            nBottom = nTop + mnAscent + mnDescent;
+        }
+        const sal_Int32 nX1 = sal_Int32(floor(nLeft));
+        const sal_Int32 nY1 = sal_Int32(floor(nTop));
+        const sal_Int32 nX2 = sal_Int32(ceil(nRight));
+        const sal_Int32 nY2 = sal_Int32(ceil(nBottom));
+
+        return awt::Rectangle(nX1,nY1,nX2-nX1+1,nY2-nY1+1);
+    }
+
+    // We are still here.  That means that the given index lies past the
+    // last character in the paragraph.
+    // Return an empty box that lies past the last character.  Better than nothing.
+    return awt::Rectangle(sal_Int32(nX+0.5), sal_Int32(nY+0.5), 0, 0);
+}
+
+sal_Int8 PresenterTextParagraph::GetTextDirection() const
+{
+    // Find first portion that has a non-neutral text direction.
+    sal_Int32 nPosition (0);
+    sal_Int32 nTextLength (msParagraphText.getLength());
+    while (nPosition < nTextLength)
+    {
+        const sal_Int16 nScriptDirection (
+            mxScriptTypeDetector->getScriptDirection(
+                msParagraphText, nPosition, i18n::ScriptDirection::NEUTRAL));
+        switch (nScriptDirection)
+        {
+            case i18n::ScriptDirection::NEUTRAL:
+                // continue looping.
+                break;
+            case i18n::ScriptDirection::LEFT_TO_RIGHT:
+                return rendering::TextDirection::WEAK_LEFT_TO_RIGHT;
+
+            case i18n::ScriptDirection::RIGHT_TO_LEFT:
+                return rendering::TextDirection::WEAK_RIGHT_TO_LEFT;
+        }
+
+        nPosition = mxScriptTypeDetector->endOfScriptDirection(
+            msParagraphText, nPosition, nScriptDirection);
+    }
+
+    // All text in paragraph is neutral.  Fall back on writing mode taken
+    // from the XText (which may not be properly initialized.)
+    sal_Int8 nTextDirection(rendering::TextDirection::WEAK_LEFT_TO_RIGHT);
+    switch(mnWritingMode)
+    {
+        case text::WritingMode2::LR_TB:
+            nTextDirection = rendering::TextDirection::WEAK_LEFT_TO_RIGHT;
+            break;
+
+        case text::WritingMode2::RL_TB:
+            nTextDirection = rendering::TextDirection::WEAK_RIGHT_TO_LEFT;
+            break;
+
+        default:
+        case text::WritingMode2::TB_RL:
+        case text::WritingMode2::TB_LR:
+            // Can not handle this.  Use default and hope for the best.
+            break;
+    }
+    return nTextDirection;
+}
+
+bool PresenterTextParagraph::IsTextReferencePointLeft() const
+{
+    return mnWritingMode != text::WritingMode2::RL_TB;
+}
+
+void PresenterTextParagraph::SetupCellArray (
+    const PresenterTheme::SharedFontDescriptor& rpFont)
+{
+    maCells.clear();
+
+    if ( ! rpFont || ! rpFont->mxFont.is())
+        return;
+
+    sal_Int32 nPosition (0);
+    sal_Int32 nIndex (0);
+    const sal_Int32 nTextLength (msParagraphText.getLength());
+    const sal_Int8 nTextDirection (GetTextDirection());
+    while (nPosition < nTextLength)
+    {
+        const sal_Int32 nNewPosition (mxBreakIterator->nextCharacters(
+            msParagraphText,
+            nPosition,
+            lang::Locale(),
+            i18n::CharacterIteratorMode::SKIPCELL,
+            1,
+            nIndex));
+
+        rendering::StringContext aContext (msParagraphText, nPosition, nNewPosition-nPosition);
+        Reference<rendering::XTextLayout> xLayout (
+            rpFont->mxFont->createTextLayout(aContext, nTextDirection, 0));
+        css::geometry::RealRectangle2D aCharacterBox (xLayout->queryTextBounds());
+
+        maCells.emplace_back(
+            nPosition,
+            nNewPosition-nPosition,
+            aCharacterBox.X2-aCharacterBox.X1);
+
+        nPosition = nNewPosition;
+    }
+}
+
+//===== PresenterTextCaret ================================================----
+
+PresenterTextCaret::PresenterTextCaret (
+        uno::Reference<uno::XComponentContext> const& xContext,
+    const ::std::function<css::awt::Rectangle (const sal_Int32,const sal_Int32)>& rCharacterBoundsAccess,
+    const ::std::function<void (const css::awt::Rectangle&)>& rInvalidator)
+    : m_xContext(xContext)
+    , mnParagraphIndex(-1),
+      mnCharacterIndex(-1),
+      mnCaretBlinkTaskId(0),
+      mbIsCaretVisible(false),
+      maCharacterBoundsAccess(rCharacterBoundsAccess),
+      maInvalidator(rInvalidator)
+{
+}
+
+PresenterTextCaret::~PresenterTextCaret()
+{
+    try
+    {
+        HideCaret();
+    }
+    catch (uno::Exception const&)
+    {
+        TOOLS_WARN_EXCEPTION("sdext.presenter", "unexpected exception in ~PresenterTextCaret");
+    }
+}
+
+void PresenterTextCaret::ShowCaret()
+{
+    if (mnCaretBlinkTaskId == 0)
+    {
+        mnCaretBlinkTaskId = PresenterTimer::ScheduleRepeatedTask (
+            m_xContext,
+            [this] (TimeValue const&) { return this->InvertCaret(); },
+            CaretBlinkInterval,
+            CaretBlinkInterval);
+    }
+    mbIsCaretVisible = true;
+}
+
+void PresenterTextCaret::HideCaret()
+{
+    if (mnCaretBlinkTaskId != 0)
+    {
+        PresenterTimer::CancelTask(mnCaretBlinkTaskId);
+        mnCaretBlinkTaskId = 0;
+    }
+    mbIsCaretVisible = false;
+    // Reset the caret position.
+    mnParagraphIndex = -1;
+    mnCharacterIndex = -1;
+}
+
+
+void PresenterTextCaret::SetPosition (
+    const sal_Int32 nParagraphIndex,
+    const sal_Int32 nCharacterIndex)
+{
+    if (mnParagraphIndex == nParagraphIndex
+        && mnCharacterIndex == nCharacterIndex)
+        return;
+
+    if (mnParagraphIndex >= 0)
+        maInvalidator(maCaretBounds);
+
+    const sal_Int32 nOldParagraphIndex (mnParagraphIndex);
+    const sal_Int32 nOldCharacterIndex (mnCharacterIndex);
+    mnParagraphIndex = nParagraphIndex;
+    mnCharacterIndex = nCharacterIndex;
+    maCaretBounds = maCharacterBoundsAccess(mnParagraphIndex, mnCharacterIndex);
+    if (mnParagraphIndex >= 0)
+        ShowCaret();
+    else
+        HideCaret();
+
+    if (mnParagraphIndex >= 0)
+        maInvalidator(maCaretBounds);
+
+    if (maBroadcaster)
+        maBroadcaster(
+            nOldParagraphIndex,
+            nOldCharacterIndex,
+            mnParagraphIndex,
+            mnCharacterIndex);
+}
+
+
+void PresenterTextCaret::SetCaretMotionBroadcaster (
+    const ::std::function<void (sal_Int32,sal_Int32,sal_Int32,sal_Int32)>& rBroadcaster)
+{
+    maBroadcaster = rBroadcaster;
+}
+
+const css::awt::Rectangle& PresenterTextCaret::GetBounds() const
+{
+    return maCaretBounds;
+}
+
+void PresenterTextCaret::InvertCaret()
+{
+    mbIsCaretVisible = !mbIsCaretVisible;
+    if (mnParagraphIndex >= 0)
+        maInvalidator(maCaretBounds);
+}
+
+//===== PresenterTextParagraph::Cell ==========================================
+
+PresenterTextParagraph::Cell::Cell (
+    const sal_Int32 nCharacterIndex,
+    const sal_Int32 nCharacterCount,
+    const double nCellWidth)
+    : mnCharacterIndex(nCharacterIndex),
+      mnCharacterCount(nCharacterCount),
+      mnCellWidth(nCellWidth)
+{
+}
+
+//===== PresenterTextParagraph::Line ==========================================
+
+PresenterTextParagraph::Line::Line (
+    const sal_Int32 nLineStartCharacterIndex,
+    const sal_Int32 nLineEndCharacterIndex)
+    : mnLineStartCharacterIndex(nLineStartCharacterIndex),
+      mnLineEndCharacterIndex(nLineEndCharacterIndex),
+      mnLineStartCellIndex(-1), mnLineEndCellIndex(-1),
+      mnBaseLine(0), mnWidth(0)
+{
+}
+
+void PresenterTextParagraph::Line::ProvideCellBoxes()
+{
+    if ( mnLineStartCharacterIndex < mnLineEndCharacterIndex && !maCellBoxes.hasElements() )
+    {
+        if (mxLayoutedLine.is())
+            maCellBoxes = mxLayoutedLine->queryInkMeasures();
+        else
+        {
+            OSL_ASSERT(mxLayoutedLine.is());
+        }
+    }
+}
+
+void PresenterTextParagraph::Line::ProvideLayoutedLine (
+    const OUString& rsParagraphText,
+    const PresenterTheme::SharedFontDescriptor& rpFont,
+    const sal_Int8 nTextDirection)
+{
+    if ( ! mxLayoutedLine.is())
+    {
+        const rendering::StringContext aContext (
+            rsParagraphText,
+            mnLineStartCharacterIndex,
+            mnLineEndCharacterIndex - mnLineStartCharacterIndex);
+
+        mxLayoutedLine = rpFont->mxFont->createTextLayout(
+            aContext,
+            nTextDirection,
+            0);
+    }
+}
+
+} // end of namespace ::sdext::presenter
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */