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, 2271 insertions, 0 deletions

diff --git a/accessibility/source/extended/textwindowaccessibility.cxx b/accessibility/source/extended/textwindowaccessibility.cxx
new file mode 100644
index 000000000..218ba33e6
--- /dev/null
+++ b/accessibility/source/extended/textwindowaccessibility.cxx
@@ -0,0 +1,2271 @@
+/* -*- 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 <sal/config.h>
+#include <sal/log.hxx>
+
+#include <com/sun/star/accessibility/AccessibleEventId.hpp>
+#include <com/sun/star/accessibility/AccessibleRelationType.hpp>
+#include <com/sun/star/accessibility/AccessibleRole.hpp>
+#include <com/sun/star/accessibility/AccessibleStateType.hpp>
+#include <com/sun/star/awt/FontWeight.hpp>
+#include <com/sun/star/lang/IndexOutOfBoundsException.hpp>
+#include <com/sun/star/lang/WrappedTargetRuntimeException.hpp>
+#include <com/sun/star/i18n/Boundary.hpp>
+#include <cppuhelper/exc_hlp.hxx>
+#include <extended/textwindowaccessibility.hxx>
+#include <comphelper/accessibleeventnotifier.hxx>
+#include <unotools/accessiblerelationsethelper.hxx>
+#include <unotools/accessiblestatesethelper.hxx>
+#include <utility>
+#include <vcl/svapp.hxx>
+#include <vcl/txtattr.hxx>
+#include <vcl/window.hxx>
+#include <tools/diagnose_ex.h>
+#include <toolkit/helper/convert.hxx>
+#include <comphelper/sequence.hxx>
+
+#include <algorithm>
+#include <memory>
+#include <numeric>
+#include <vector>
+
+namespace accessibility
+{
+void SfxListenerGuard::startListening(::SfxBroadcaster & rNotifier)
+{
+    assert(m_pNotifier == nullptr && "called more than once");
+    m_pNotifier = &rNotifier;
+    m_rListener.StartListening(*m_pNotifier, DuplicateHandling::Prevent);
+}
+
+void SfxListenerGuard::endListening()
+{
+    if (m_pNotifier != nullptr)
+    {
+        m_rListener.EndListening(*m_pNotifier);
+        m_pNotifier = nullptr;
+    }
+}
+
+void WindowListenerGuard::startListening(vcl::Window & rNotifier)
+{
+    assert(m_pNotifier == nullptr && "called more than once");
+    m_pNotifier = &rNotifier;
+    m_pNotifier->AddEventListener(m_aListener);
+}
+
+void WindowListenerGuard::endListening()
+{
+    if (m_pNotifier)
+    {
+        m_pNotifier->RemoveEventListener(m_aListener);
+        m_pNotifier = nullptr;
+    }
+}
+
+Paragraph::Paragraph(::rtl::Reference< Document > xDocument,
+                             Paragraphs::size_type nNumber):
+    ParagraphBase(m_aMutex),
+    m_xDocument(std::move(xDocument)),
+    m_nNumber(nNumber),
+    m_nClientId(0)
+{
+    m_aParagraphText = m_xDocument->retrieveParagraphText(this);
+}
+
+void
+Paragraph::numberChanged(bool bIncremented)
+{
+    if (bIncremented)
+        ++m_nNumber;
+    else
+        --m_nNumber;
+}
+
+void Paragraph::textChanged()
+{
+    OUString aParagraphText = implGetText();
+    css::uno::Any aOldValue, aNewValue;
+    if ( implInitTextChangedEvent( m_aParagraphText, aParagraphText, aOldValue, aNewValue ) )
+    {
+        m_aParagraphText = aParagraphText;
+        notifyEvent(css::accessibility::AccessibleEventId::
+                    TEXT_CHANGED,
+                    aOldValue, aNewValue);
+    }
+}
+
+void Paragraph::notifyEvent(::sal_Int16 nEventId,
+                                css::uno::Any const & rOldValue,
+                                css::uno::Any const & rNewValue)
+{
+    if (m_nClientId)
+        comphelper::AccessibleEventNotifier::addEvent( m_nClientId, css::accessibility::AccessibleEventObject(
+                             static_cast< ::cppu::OWeakObject * >(this),
+                             nEventId, rNewValue, rOldValue) );
+}
+
+// virtual
+css::uno::Reference< css::accessibility::XAccessibleContext > SAL_CALL
+Paragraph::getAccessibleContext()
+{
+    checkDisposed();
+    return this;
+}
+
+// virtual
+::sal_Int32 SAL_CALL Paragraph::getAccessibleChildCount()
+{
+    checkDisposed();
+    return 0;
+}
+
+// virtual
+css::uno::Reference< css::accessibility::XAccessible > SAL_CALL
+Paragraph::getAccessibleChild(::sal_Int32)
+{
+    checkDisposed();
+    throw css::lang::IndexOutOfBoundsException(
+        "textwindowaccessibility.cxx:"
+        " Paragraph::getAccessibleChild",
+        static_cast< css::uno::XWeak * >(this));
+}
+
+// virtual
+css::uno::Reference< css::accessibility::XAccessible > SAL_CALL
+Paragraph::getAccessibleParent()
+{
+    checkDisposed();
+    return m_xDocument->getAccessible();
+}
+
+// virtual
+::sal_Int32 SAL_CALL Paragraph::getAccessibleIndexInParent()
+{
+    checkDisposed();
+    return m_xDocument->retrieveParagraphIndex(this);
+}
+
+// virtual
+::sal_Int16 SAL_CALL Paragraph::getAccessibleRole()
+{
+    checkDisposed();
+    return css::accessibility::AccessibleRole::PARAGRAPH;
+}
+
+// virtual
+OUString SAL_CALL Paragraph::getAccessibleDescription()
+{
+    checkDisposed();
+    return OUString();
+}
+
+// virtual
+OUString SAL_CALL Paragraph::getAccessibleName()
+{
+    checkDisposed();
+    return OUString();
+}
+
+// virtual
+css::uno::Reference< css::accessibility::XAccessibleRelationSet >
+SAL_CALL Paragraph::getAccessibleRelationSet()
+{
+    checkDisposed();
+    return m_xDocument->retrieveParagraphRelationSet( this );
+}
+
+// virtual
+css::uno::Reference< css::accessibility::XAccessibleStateSet >
+SAL_CALL Paragraph::getAccessibleStateSet()
+{
+    checkDisposed();
+
+    // FIXME  Notification of changes (STATE_CHANGED) missing when
+    // m_rView.IsReadOnly() changes:
+    return new ::utl::AccessibleStateSetHelper(
+        m_xDocument->retrieveParagraphState(this));
+}
+
+// virtual
+css::lang::Locale SAL_CALL Paragraph::getLocale()
+{
+    checkDisposed();
+    return m_xDocument->retrieveLocale();
+}
+
+// virtual
+sal_Bool SAL_CALL Paragraph::containsPoint(css::awt::Point const & rPoint)
+{
+    checkDisposed();
+    css::awt::Rectangle aRect(m_xDocument->retrieveParagraphBounds(this,
+                                                                     false));
+    return rPoint.X >= 0 && rPoint.X < aRect.Width
+        && rPoint.Y >= 0 && rPoint.Y < aRect.Height;
+}
+
+// virtual
+css::uno::Reference< css::accessibility::XAccessible > SAL_CALL
+Paragraph::getAccessibleAtPoint(css::awt::Point const &)
+{
+    checkDisposed();
+    return nullptr;
+}
+
+// virtual
+css::awt::Rectangle SAL_CALL Paragraph::getBounds()
+{
+    checkDisposed();
+    return m_xDocument->retrieveParagraphBounds(this, false);
+}
+
+// virtual
+css::awt::Point SAL_CALL Paragraph::getLocation()
+{
+    checkDisposed();
+    css::awt::Rectangle aRect(m_xDocument->retrieveParagraphBounds(this,
+                                                                     false));
+    return css::awt::Point(aRect.X, aRect.Y);
+}
+
+// virtual
+css::awt::Point SAL_CALL Paragraph::getLocationOnScreen()
+{
+    checkDisposed();
+    css::awt::Rectangle aRect(m_xDocument->retrieveParagraphBounds(this,
+                                                                     true));
+    return css::awt::Point(aRect.X, aRect.Y);
+}
+
+// virtual
+css::awt::Size SAL_CALL Paragraph::getSize()
+{
+    checkDisposed();
+    css::awt::Rectangle aRect(m_xDocument->retrieveParagraphBounds(this,
+                                                                     false));
+    return css::awt::Size(aRect.Width, aRect.Height);
+}
+
+// virtual
+void SAL_CALL Paragraph::grabFocus()
+{
+    checkDisposed();
+    VclPtr<vcl::Window> pWindow = m_xDocument->GetWindow();
+    if ( pWindow )
+    {
+        pWindow->GrabFocus();
+    }
+    try
+    {
+        m_xDocument->changeParagraphSelection(this, 0, 0);
+    }
+    catch (const css::lang::IndexOutOfBoundsException &)
+    {
+        TOOLS_INFO_EXCEPTION("accessibility", "Paragraph::grabFocus: caught unexpected");
+    }
+}
+
+// virtual
+sal_Int32 SAL_CALL Paragraph::getForeground()
+{
+    return 0; // TODO
+}
+
+// virtual
+sal_Int32 SAL_CALL Paragraph::getBackground()
+{
+    return 0; // TODO
+}
+
+// virtual
+::sal_Int32 SAL_CALL Paragraph::getCaretPosition()
+{
+    checkDisposed();
+    return m_xDocument->retrieveParagraphCaretPosition(this);
+}
+
+// virtual
+sal_Bool SAL_CALL Paragraph::setCaretPosition(::sal_Int32 nIndex)
+{
+    checkDisposed();
+    m_xDocument->changeParagraphSelection(this, nIndex, nIndex);
+    return true;
+}
+
+// virtual
+::sal_Unicode SAL_CALL Paragraph::getCharacter(::sal_Int32 nIndex)
+{
+    checkDisposed();
+    return OCommonAccessibleText::implGetCharacter(implGetText(), nIndex);
+}
+
+// virtual
+css::uno::Sequence< css::beans::PropertyValue > SAL_CALL
+Paragraph::getCharacterAttributes(::sal_Int32 nIndex, const css::uno::Sequence< OUString >& aRequestedAttributes)
+{
+    checkDisposed();
+    return m_xDocument->retrieveCharacterAttributes( this, nIndex, aRequestedAttributes );
+}
+
+// virtual
+css::awt::Rectangle SAL_CALL
+Paragraph::getCharacterBounds(::sal_Int32 nIndex)
+{
+    checkDisposed();
+    css::awt::Rectangle aBounds(m_xDocument->retrieveCharacterBounds(this, nIndex));
+    css::awt::Rectangle aParaBounds(m_xDocument->retrieveParagraphBounds(this, false));
+    aBounds.X -= aParaBounds.X;
+    aBounds.Y -= aParaBounds.Y;
+    return aBounds;
+}
+
+// virtual
+::sal_Int32 SAL_CALL Paragraph::getCharacterCount()
+{
+    checkDisposed();
+    return implGetText().getLength();
+}
+
+// virtual
+::sal_Int32 SAL_CALL
+Paragraph::getIndexAtPoint(css::awt::Point const & rPoint)
+{
+    checkDisposed();
+    css::awt::Point aPoint(rPoint);
+    css::awt::Rectangle aParaBounds(m_xDocument->retrieveParagraphBounds(this, false));
+    aPoint.X += aParaBounds.X;
+    aPoint.Y += aParaBounds.Y;
+    return m_xDocument->retrieveCharacterIndex(this, aPoint);
+}
+
+// virtual
+OUString SAL_CALL Paragraph::getSelectedText()
+{
+    checkDisposed();
+
+    return OCommonAccessibleText::getSelectedText();
+}
+
+// virtual
+::sal_Int32 SAL_CALL Paragraph::getSelectionStart()
+{
+    checkDisposed();
+    return OCommonAccessibleText::getSelectionStart();
+}
+
+// virtual
+::sal_Int32 SAL_CALL Paragraph::getSelectionEnd()
+{
+    checkDisposed();
+    return OCommonAccessibleText::getSelectionEnd();
+}
+
+// virtual
+sal_Bool SAL_CALL Paragraph::setSelection(::sal_Int32 nStartIndex,
+                                                ::sal_Int32 nEndIndex)
+{
+    checkDisposed();
+    m_xDocument->changeParagraphSelection(this, nStartIndex, nEndIndex);
+    return true;
+}
+
+// virtual
+OUString SAL_CALL Paragraph::getText()
+{
+    checkDisposed();
+    return implGetText();
+}
+
+// virtual
+OUString SAL_CALL Paragraph::getTextRange(::sal_Int32 nStartIndex,
+                                                     ::sal_Int32 nEndIndex)
+{
+    checkDisposed();
+    return OCommonAccessibleText::implGetTextRange(implGetText(), nStartIndex, nEndIndex);
+}
+
+// virtual
+css::accessibility::TextSegment SAL_CALL Paragraph::getTextAtIndex( sal_Int32 nIndex, sal_Int16 aTextType )
+{
+    checkDisposed();
+    return OCommonAccessibleText::getTextAtIndex(nIndex, aTextType);
+}
+
+// virtual
+css::accessibility::TextSegment SAL_CALL Paragraph::getTextBeforeIndex( sal_Int32 nIndex, sal_Int16 aTextType )
+{
+    checkDisposed();
+    return OCommonAccessibleText::getTextBeforeIndex(nIndex, aTextType);
+}
+
+// virtual
+css::accessibility::TextSegment SAL_CALL Paragraph::getTextBehindIndex( sal_Int32 nIndex, sal_Int16 aTextType )
+{
+    checkDisposed();
+    return OCommonAccessibleText::getTextBehindIndex(nIndex, aTextType);
+}
+
+// virtual
+sal_Bool SAL_CALL Paragraph::copyText(::sal_Int32 nStartIndex,
+                                            ::sal_Int32 nEndIndex)
+{
+    checkDisposed();
+    m_xDocument->copyParagraphText(this, nStartIndex, nEndIndex);
+    return true;
+}
+
+// virtual
+sal_Bool SAL_CALL Paragraph::scrollSubstringTo( sal_Int32, sal_Int32, css::accessibility::AccessibleScrollType )
+{
+    return false;
+}
+
+// virtual
+sal_Bool SAL_CALL Paragraph::cutText(::sal_Int32 nStartIndex,
+                                           ::sal_Int32 nEndIndex)
+{
+    checkDisposed();
+    m_xDocument->changeParagraphText(this, nStartIndex, nEndIndex, true, false,
+                                     OUString());
+    return true;
+}
+
+// virtual
+sal_Bool SAL_CALL Paragraph::pasteText(::sal_Int32 nIndex)
+{
+    checkDisposed();
+    m_xDocument->changeParagraphText(this, nIndex, nIndex, false, true,
+                                     OUString());
+    return true;
+}
+
+// virtual
+sal_Bool SAL_CALL Paragraph::deleteText(::sal_Int32 nStartIndex,
+                                          ::sal_Int32 nEndIndex)
+{
+    checkDisposed();
+    m_xDocument->changeParagraphText(this, nStartIndex, nEndIndex, false, false,
+                                     OUString());
+    return true;
+}
+
+// virtual
+sal_Bool SAL_CALL Paragraph::insertText(OUString const & rText,
+                                              ::sal_Int32 nIndex)
+{
+    checkDisposed();
+    m_xDocument->changeParagraphText(this, nIndex, nIndex, false, false, rText);
+    return true;
+}
+
+// virtual
+sal_Bool SAL_CALL
+Paragraph::replaceText(::sal_Int32 nStartIndex, ::sal_Int32 nEndIndex,
+                           OUString const & rReplacement)
+{
+    checkDisposed();
+    m_xDocument->changeParagraphText(this, nStartIndex, nEndIndex, false, false,
+                                     rReplacement);
+    return true;
+}
+
+// virtual
+sal_Bool SAL_CALL Paragraph::setAttributes(
+    ::sal_Int32 nStartIndex, ::sal_Int32 nEndIndex,
+    css::uno::Sequence< css::beans::PropertyValue > const & rAttributeSet)
+{
+    checkDisposed();
+    m_xDocument->changeParagraphAttributes(this, nStartIndex, nEndIndex,
+                                           rAttributeSet);
+    return true;
+}
+
+// virtual
+sal_Bool SAL_CALL Paragraph::setText(OUString const & rText)
+{
+    checkDisposed();
+    m_xDocument->changeParagraphText(this, rText);
+    return true;
+}
+
+// virtual
+css::uno::Sequence< css::beans::PropertyValue > SAL_CALL
+Paragraph::getDefaultAttributes(const css::uno::Sequence< OUString >&)
+{
+    checkDisposed();
+    return {}; // default attributes are not supported by text engine
+}
+
+// virtual
+css::uno::Sequence< css::beans::PropertyValue > SAL_CALL
+Paragraph::getRunAttributes(::sal_Int32 Index, const css::uno::Sequence< OUString >& RequestedAttributes)
+{
+    checkDisposed();
+    return m_xDocument->retrieveRunAttributes( this, Index, RequestedAttributes );
+}
+
+// virtual
+::sal_Int32 SAL_CALL Paragraph::getLineNumberAtIndex( ::sal_Int32 nIndex )
+{
+    checkDisposed();
+
+    ::sal_Int32 nLineNo = -1;
+    m_xDocument->retrieveParagraphLineBoundary( this, nIndex, &nLineNo );
+
+    return nLineNo;
+}
+
+// virtual
+css::accessibility::TextSegment SAL_CALL Paragraph::getTextAtLineNumber( ::sal_Int32 nLineNo )
+{
+    checkDisposed();
+
+    css::i18n::Boundary aBoundary =
+        m_xDocument->retrieveParagraphBoundaryOfLine( this, nLineNo );
+
+    return css::accessibility::TextSegment( getTextRange(aBoundary.startPos, aBoundary.endPos),
+        aBoundary.startPos, aBoundary.endPos);
+}
+
+// virtual
+css::accessibility::TextSegment SAL_CALL Paragraph::getTextAtLineWithCaret(  )
+{
+    checkDisposed();
+
+    sal_Int32 nLineNo = getNumberOfLineWithCaret();
+
+    try {
+        return ( nLineNo >= 0 ) ?
+            getTextAtLineNumber( nLineNo ) :
+            css::accessibility::TextSegment();
+    } catch (const css::lang::IndexOutOfBoundsException&) {
+        css::uno::Any anyEx = cppu::getCaughtException();
+        throw css::lang::WrappedTargetRuntimeException(
+            "textwindowaccessibility.cxx:"
+            " Paragraph::getTextAtLineWithCaret",
+            static_cast< css::uno::XWeak * >( this ), anyEx );
+    }
+}
+
+// virtual
+::sal_Int32 SAL_CALL Paragraph::getNumberOfLineWithCaret(  )
+{
+    checkDisposed();
+    return m_xDocument->retrieveParagraphLineWithCursor(this);
+}
+
+
+// virtual
+void SAL_CALL Paragraph::addAccessibleEventListener(
+    css::uno::Reference<
+    css::accessibility::XAccessibleEventListener > const & rListener)
+{
+    if (!rListener.is())
+        return;
+
+    ::osl::ClearableMutexGuard aGuard(rBHelper.rMutex);
+    if (rBHelper.bDisposed || rBHelper.bInDispose)
+    {
+        aGuard.clear();
+        rListener->disposing(css::lang::EventObject(
+                                static_cast< ::cppu::OWeakObject * >(this)));
+    }
+    else
+    {
+        if (!m_nClientId)
+            m_nClientId = comphelper::AccessibleEventNotifier::registerClient( );
+        comphelper::AccessibleEventNotifier::addEventListener( m_nClientId, rListener );
+    }
+}
+
+// virtual
+void SAL_CALL Paragraph::removeAccessibleEventListener(
+    css::uno::Reference<
+    css::accessibility::XAccessibleEventListener > const & rListener)
+{
+    comphelper::AccessibleEventNotifier::TClientId nId = 0;
+    {
+        osl::MutexGuard aGuard(rBHelper.rMutex);
+        if (rListener.is() && m_nClientId != 0
+            && comphelper::AccessibleEventNotifier::removeEventListener( m_nClientId, rListener ) == 0)
+        {
+            nId = m_nClientId;
+            m_nClientId = 0;
+        }
+    }
+    if (nId != 0)
+    {
+        // no listeners anymore
+        // -> revoke ourself. This may lead to the notifier thread dying (if we were the last client),
+        // and at least to us not firing any events anymore, in case somebody calls
+        // NotifyAccessibleEvent, again
+        comphelper::AccessibleEventNotifier::revokeClient(nId);
+    }
+}
+
+// virtual
+void SAL_CALL Paragraph::disposing()
+{
+    comphelper::AccessibleEventNotifier::TClientId nId = 0;
+    {
+        osl::MutexGuard aGuard(rBHelper.rMutex);
+        nId = m_nClientId;
+        m_nClientId = 0;
+    }
+    if (nId != 0)
+        comphelper::AccessibleEventNotifier::revokeClientNotifyDisposing(nId, *this);
+}
+
+// virtual
+OUString Paragraph::implGetText()
+{
+    return m_xDocument->retrieveParagraphText(this);
+}
+
+// virtual
+css::lang::Locale Paragraph::implGetLocale()
+{
+    return m_xDocument->retrieveLocale();
+}
+
+// virtual
+void Paragraph::implGetSelection(::sal_Int32 & rStartIndex,
+                                     ::sal_Int32 & rEndIndex)
+{
+    m_xDocument->retrieveParagraphSelection(this, &rStartIndex, &rEndIndex);
+}
+
+// virtual
+void Paragraph::implGetParagraphBoundary( const OUString& rText,
+                                          css::i18n::Boundary& rBoundary,
+                                          ::sal_Int32 nIndex )
+{
+    ::sal_Int32 nLength = rText.getLength();
+
+    if ( implIsValidIndex( nIndex, nLength ) )
+    {
+        rBoundary.startPos = 0;
+        rBoundary.endPos = nLength;
+    }
+    else
+    {
+        rBoundary.startPos = nIndex;
+        rBoundary.endPos = nIndex;
+    }
+}
+
+// virtual
+void Paragraph::implGetLineBoundary( const OUString& rText,
+                                     css::i18n::Boundary& rBoundary,
+                                     ::sal_Int32 nIndex )
+{
+    ::sal_Int32 nLength = rText.getLength();
+
+    if ( implIsValidIndex( nIndex, nLength ) || nIndex == nLength )
+    {
+        css::i18n::Boundary aBoundary =
+            m_xDocument->retrieveParagraphLineBoundary( this, nIndex, nullptr );
+        rBoundary.startPos = aBoundary.startPos;
+        rBoundary.endPos = aBoundary.endPos;
+    }
+    else
+    {
+        rBoundary.startPos = nIndex;
+        rBoundary.endPos = nIndex;
+    }
+}
+
+
+void Paragraph::checkDisposed()
+{
+    ::osl::MutexGuard aGuard(rBHelper.rMutex);
+    if (!(rBHelper.bDisposed || rBHelper.bInDispose))
+        return;
+    throw css::lang::DisposedException(
+        OUString(), static_cast< css::uno::XWeak * >(this));
+}
+
+Document::Document(::VCLXWindow * pVclXWindow, ::TextEngine & rEngine,
+                   ::TextView & rView):
+    VCLXAccessibleComponent(pVclXWindow),
+    m_xAccessible(pVclXWindow),
+    m_rEngine(rEngine),
+    m_rView(rView),
+    m_aEngineListener(*this),
+    m_aViewListener(LINK(this, Document, WindowEventHandler)),
+    m_nViewOffset(0),
+    m_nViewHeight(0),
+    m_nVisibleBeginOffset(0),
+    m_nSelectionFirstPara(-1),
+    m_nSelectionFirstPos(-1),
+    m_nSelectionLastPara(-1),
+    m_nSelectionLastPos(-1),
+    m_bSelectionChangedNotification(false)
+{}
+
+css::lang::Locale Document::retrieveLocale()
+{
+    SolarMutexGuard aGuard;
+    return m_rEngine.GetLocale();
+}
+
+::sal_Int32 Document::retrieveParagraphIndex(Paragraph const * pParagraph)
+{
+    ::osl::MutexGuard aInternalGuard(GetMutex());
+
+    // If a client holds on to a Paragraph that is no longer visible, it can
+    // happen that this Paragraph lies outside the range from m_aVisibleBegin
+    // to m_aVisibleEnd.  In that case, return -1 instead of a valid index:
+    Paragraphs::iterator aPara(m_xParagraphs->begin()
+                               + pParagraph->getNumber());
+    return aPara < m_aVisibleBegin || aPara >= m_aVisibleEnd
+        ? -1 : static_cast< ::sal_Int32 >(aPara - m_aVisibleBegin);
+        // XXX  numeric overflow
+}
+
+::sal_Int64 Document::retrieveParagraphState(Paragraph const * pParagraph)
+{
+    ::osl::MutexGuard aInternalGuard(GetMutex());
+
+    // If a client holds on to a Paragraph that is no longer visible, it can
+    // happen that this Paragraph lies outside the range from m_aVisibleBegin
+    // to m_aVisibleEnd.  In that case, it is neither VISIBLE nor SHOWING:
+    ::sal_Int64 nState
+          = (static_cast< ::sal_Int64 >(1)
+             << css::accessibility::AccessibleStateType::ENABLED)
+          | (static_cast< ::sal_Int64 >(1)
+             << css::accessibility::AccessibleStateType::SENSITIVE)
+          | (static_cast< ::sal_Int64 >(1)
+             << css::accessibility::AccessibleStateType::FOCUSABLE)
+          | (static_cast< ::sal_Int64 >(1)
+             << css::accessibility::AccessibleStateType::MULTI_LINE);
+    if (!m_rView.IsReadOnly())
+        nState |= (static_cast< ::sal_Int64 >(1)
+                   << css::accessibility::AccessibleStateType::EDITABLE);
+    Paragraphs::iterator aPara(m_xParagraphs->begin()
+                               + pParagraph->getNumber());
+    if (aPara >= m_aVisibleBegin && aPara < m_aVisibleEnd)
+    {
+        nState
+            |= (static_cast< ::sal_Int64 >(1)
+                << css::accessibility::AccessibleStateType::VISIBLE)
+            | (static_cast< ::sal_Int64 >(1)
+               << css::accessibility::AccessibleStateType::SHOWING);
+        if (aPara == m_aFocused)
+            nState |= (static_cast< ::sal_Int64 >(1)
+                       << css::accessibility::AccessibleStateType::FOCUSED);
+    }
+    return nState;
+};
+
+css::awt::Rectangle
+Document::retrieveParagraphBounds(Paragraph const * pParagraph,
+                                  bool bAbsolute)
+{
+    SolarMutexGuard aGuard;
+    ::osl::MutexGuard aInternalGuard(GetMutex());
+
+    // If a client holds on to a Paragraph that is no longer visible (as it
+    // scrolled out the top of the view), it can happen that this Paragraph
+    // lies before m_aVisibleBegin.  In that case, calculate the vertical
+    // position of the Paragraph starting at paragraph 0, otherwise optimize
+    // and start at m_aVisibleBegin:
+    Paragraphs::iterator aPara(m_xParagraphs->begin()
+                               + pParagraph->getNumber());
+    auto lAddHeight = [](const sal_Int32& rSum, const ParagraphInfo& rParagraph) {
+        return rSum + rParagraph.getHeight(); };
+    ::sal_Int32 nPos;
+    if (aPara < m_aVisibleBegin)
+        nPos = std::accumulate(m_xParagraphs->begin(), aPara, sal_Int32(0), lAddHeight);
+    else
+        nPos = std::accumulate(m_aVisibleBegin, aPara, m_nViewOffset - m_nVisibleBeginOffset, lAddHeight);
+
+    Point aOrig(0, 0);
+    if (bAbsolute)
+        aOrig = m_rView.GetWindow()->OutputToAbsoluteScreenPixel(aOrig);
+
+    return css::awt::Rectangle(
+        static_cast< ::sal_Int32 >(aOrig.X()),
+        static_cast< ::sal_Int32 >(aOrig.Y()) + nPos - m_nViewOffset,
+        m_rView.GetWindow()->GetOutputSizePixel().Width(), aPara->getHeight());
+        // XXX  numeric overflow (3x)
+}
+
+OUString
+Document::retrieveParagraphText(Paragraph const * pParagraph)
+{
+    SolarMutexGuard aGuard;
+    ::osl::MutexGuard aInternalGuard(GetMutex());
+    return m_rEngine.GetText(static_cast< ::sal_uInt32 >(pParagraph->getNumber()));
+        // numeric overflow cannot happen here
+}
+
+void Document::retrieveParagraphSelection(Paragraph const * pParagraph,
+                                          ::sal_Int32 * pBegin,
+                                          ::sal_Int32 * pEnd)
+{
+    SolarMutexGuard aGuard;
+    ::osl::MutexGuard aInternalGuard(GetMutex());
+    ::TextSelection const & rSelection = m_rView.GetSelection();
+    Paragraphs::size_type nNumber = pParagraph->getNumber();
+    TextPaM aStartPaM( rSelection.GetStart() );
+    TextPaM aEndPaM( rSelection.GetEnd() );
+    TextPaM aMinPaM( std::min( aStartPaM, aEndPaM ) );
+    TextPaM aMaxPaM( std::max( aStartPaM, aEndPaM ) );
+
+    if ( nNumber >= aMinPaM.GetPara() && nNumber <= aMaxPaM.GetPara() )
+    {
+        *pBegin = nNumber > aMinPaM.GetPara() ? 0 : aMinPaM.GetIndex();
+            // XXX numeric overflow
+        *pEnd = nNumber < aMaxPaM.GetPara()
+            ? m_rEngine.GetText(static_cast< ::sal_uInt32 >(nNumber)).getLength()
+            : aMaxPaM.GetIndex();
+            // XXX  numeric overflow (3x)
+
+        if ( aStartPaM > aEndPaM )
+            std::swap( *pBegin, *pEnd );
+    }
+    else
+    {
+        *pBegin = 0;
+        *pEnd = 0;
+    }
+}
+
+::sal_Int32 Document::retrieveParagraphCaretPosition(Paragraph const * pParagraph)
+{
+    SolarMutexGuard aGuard;
+    ::osl::MutexGuard aInternalGuard(GetMutex());
+    ::TextSelection const & rSelection = m_rView.GetSelection();
+    Paragraphs::size_type nNumber = pParagraph->getNumber();
+    TextPaM aEndPaM( rSelection.GetEnd() );
+
+    return aEndPaM.GetPara() == nNumber ? aEndPaM.GetIndex() : -1;
+}
+
+css::awt::Rectangle
+Document::retrieveCharacterBounds(Paragraph const * pParagraph,
+                                  ::sal_Int32 nIndex)
+{
+    SolarMutexGuard aGuard;
+    ::osl::MutexGuard aInternalGuard(GetMutex());
+    ::sal_uInt32 nNumber = static_cast< ::sal_uInt32 >(pParagraph->getNumber());
+    sal_Int32 nLength = m_rEngine.GetText(nNumber).getLength();
+        // XXX  numeric overflow
+    if (nIndex < 0 || nIndex > nLength)
+        throw css::lang::IndexOutOfBoundsException(
+            "textwindowaccessibility.cxx:"
+            " Document::retrieveCharacterAttributes",
+            static_cast< css::uno::XWeak * >(this));
+    css::awt::Rectangle aBounds( 0, 0, 0, 0 );
+    if ( nIndex == nLength )
+    {
+        aBounds = AWTRectangle(
+            m_rEngine.PaMtoEditCursor(::TextPaM(nNumber, nIndex)));
+    }
+    else
+    {
+        ::tools::Rectangle aLeft(
+            m_rEngine.PaMtoEditCursor(::TextPaM(nNumber, nIndex)));
+            // XXX  numeric overflow
+        ::tools::Rectangle aRight(
+            m_rEngine.PaMtoEditCursor(::TextPaM(nNumber, nIndex + 1)));
+            // XXX  numeric overflow (2x)
+        // FIXME  If the vertical extends of the two cursors do not match, assume
+        // nIndex is the last character on the line; the bounding box will then
+        // extend to m_rEngine.GetMaxTextWidth():
+        ::sal_Int32 nWidth = (aLeft.Top() == aRight.Top()
+                            && aLeft.Bottom() == aRight.Bottom())
+            ? static_cast< ::sal_Int32 >(aRight.Left() - aLeft.Left())
+            : static_cast< ::sal_Int32 >(m_rEngine.GetMaxTextWidth()
+                                        - aLeft.Left());
+            // XXX  numeric overflow (4x)
+        aBounds = css::awt::Rectangle(static_cast< ::sal_Int32 >(aLeft.Left()),
+                                        static_cast< ::sal_Int32 >(aLeft.Top() - m_nViewOffset),
+                                        nWidth,
+                                        static_cast< ::sal_Int32 >(aLeft.Bottom()
+                                                                    - aLeft.Top()));
+            // XXX  numeric overflow (4x)
+    }
+    return aBounds;
+}
+
+::sal_Int32 Document::retrieveCharacterIndex(Paragraph const * pParagraph,
+                                             css::awt::Point const & rPoint)
+{
+    SolarMutexGuard aGuard;
+    ::osl::MutexGuard aInternalGuard(GetMutex());
+    ::sal_uInt32 nNumber = static_cast< ::sal_uInt32 >(pParagraph->getNumber());
+        // XXX  numeric overflow
+    ::TextPaM aPaM(m_rEngine.GetPaM(::Point(static_cast< tools::Long >(rPoint.X),
+                                            static_cast< tools::Long >(rPoint.Y))));
+        // XXX  numeric overflow (2x)
+    return aPaM.GetPara() == nNumber ? aPaM.GetIndex() : -1;
+        // XXX  numeric overflow
+}
+
+css::uno::Sequence< css::beans::PropertyValue >
+Document::retrieveCharacterAttributes(
+    Paragraph const * pParagraph, ::sal_Int32 nIndex,
+    const css::uno::Sequence< OUString >& aRequestedAttributes)
+{
+    SolarMutexGuard aGuard;
+
+    vcl::Font aFont = m_rEngine.GetFont();
+    const sal_Int32 AttributeCount = 9;
+    std::vector< css::beans::PropertyValue > aAttribs;
+    aAttribs.reserve(AttributeCount);
+
+    css::beans::PropertyValue aAttrib;
+    aAttrib.Handle = -1;
+    aAttrib.State = css::beans::PropertyState_DIRECT_VALUE;
+
+    //character background color
+    aAttrib.Name = "CharBackColor";
+    aAttrib.Value = mapFontColor( aFont.GetFillColor() );
+    aAttribs.push_back(aAttrib);
+
+    //character color
+    aAttrib.Name = "CharColor";
+    //aAttrib.Value = mapFontColor( aFont.GetColor() );
+    aAttrib.Value = mapFontColor( m_rEngine.GetTextColor() );
+    aAttribs.push_back(aAttrib);
+
+    //character font name
+    aAttrib.Name = "CharFontName";
+    aAttrib.Value <<= aFont.GetFamilyName();
+    aAttribs.push_back(aAttrib);
+
+    //character height
+    aAttrib.Name = "CharHeight";
+    aAttrib.Value <<= static_cast<sal_Int16>(aFont.GetFontHeight());
+    aAttribs.push_back(aAttrib);
+
+    //character posture
+    aAttrib.Name = "CharPosture";
+    aAttrib.Value <<= static_cast<sal_Int16>(aFont.GetItalic());
+    aAttribs.push_back(aAttrib);
+
+    //character relief
+    /*
+    aAttrib.Name = "CharRelief";
+    aAttrib.Value = css::uno::Any( (sal_Int16)aFont.GetRelief() );
+    aAttribs.push_back(aAttrib);
+    */
+
+    //character strikeout
+    aAttrib.Name = "CharStrikeout";
+    aAttrib.Value <<= static_cast<sal_Int16>(aFont.GetStrikeout());
+    aAttribs.push_back(aAttrib);
+
+    //character underline
+    aAttrib.Name = "CharUnderline";
+    aAttrib.Value <<= static_cast<sal_Int16>(aFont.GetUnderline());
+    aAttribs.push_back(aAttrib);
+
+    //character weight
+    aAttrib.Name = "CharWeight";
+    aAttrib.Value <<= static_cast<float>(aFont.GetWeight());
+    aAttribs.push_back(aAttrib);
+
+    //character alignment
+    aAttrib.Name = "ParaAdjust";
+    aAttrib.Value <<= static_cast<sal_Int16>(m_rEngine.GetTextAlign());
+    aAttribs.push_back(aAttrib);
+
+    ::osl::MutexGuard aInternalGuard(GetMutex());
+    ::sal_uInt32 nNumber = static_cast< ::sal_uInt32 >(pParagraph->getNumber());
+        // XXX  numeric overflow
+        // nIndex can be equal to getLength();
+    if (nIndex < 0 || nIndex > m_rEngine.GetText(nNumber).getLength())
+        throw css::lang::IndexOutOfBoundsException(
+            "textwindowaccessibility.cxx:"
+            " Document::retrieveCharacterAttributes",
+            static_cast< css::uno::XWeak * >(this));
+
+
+    // retrieve run attributes
+    tPropValMap aCharAttrSeq;
+    retrieveRunAttributesImpl( pParagraph, nIndex, aRequestedAttributes, aCharAttrSeq );
+
+    for (const css::beans::PropertyValue& rAttrib : aAttribs)
+    {
+        aCharAttrSeq[ rAttrib.Name ] = rAttrib;
+    }
+
+    const css::uno::Sequence< css::beans::PropertyValue > aRes = comphelper::mapValuesToSequence( aCharAttrSeq );
+
+    // sort the attributes
+    auto nLength = static_cast<size_t>(aRes.getLength());
+    std::unique_ptr<sal_Int32[]> pIndices( new sal_Int32[nLength] );
+    std::iota(&pIndices[0], &pIndices[nLength], 0);
+    std::sort(&pIndices[0], &pIndices[nLength],
+        [&aRes](sal_Int32 a, sal_Int32 b) { return aRes[a].Name < aRes[b].Name; });
+
+    // create sorted sequences according to index array
+    std::vector<css::beans::PropertyValue> aNewValues;
+    aNewValues.reserve(nLength);
+    std::transform(&pIndices[0], &pIndices[nLength], std::back_inserter(aNewValues),
+        [&aRes](const sal_Int32 nIdx) { return aRes[nIdx]; });
+
+    return comphelper::containerToSequence(aNewValues);
+}
+
+void Document::retrieveRunAttributesImpl(
+    Paragraph const * pParagraph, ::sal_Int32 Index,
+    const css::uno::Sequence< OUString >& RequestedAttributes,
+    tPropValMap& rRunAttrSeq)
+{
+    ::sal_uInt32 nNumber = static_cast< ::sal_uInt32 >( pParagraph->getNumber() );
+    ::TextPaM aPaM( nNumber, Index );
+        // XXX  numeric overflow
+    ::TextAttribFontColor const * pColor
+          = static_cast< ::TextAttribFontColor const * >(
+              m_rEngine.FindAttrib( aPaM, TEXTATTR_FONTCOLOR ) );
+    ::TextAttribFontWeight const * pWeight
+          = static_cast< ::TextAttribFontWeight const * >(
+              m_rEngine.FindAttrib( aPaM, TEXTATTR_FONTWEIGHT ) );
+    tPropValMap aRunAttrSeq;
+    if ( pColor )
+    {
+        css::beans::PropertyValue aPropVal;
+        aPropVal.Name = "CharColor";
+        aPropVal.Handle = -1;
+        aPropVal.Value = mapFontColor( pColor->GetColor() );
+        aPropVal.State = css::beans::PropertyState_DIRECT_VALUE;
+        aRunAttrSeq[ aPropVal.Name ] = aPropVal;
+    }
+    if ( pWeight )
+    {
+        css::beans::PropertyValue aPropVal;
+        aPropVal.Name = "CharWeight";
+        aPropVal.Handle = -1;
+        aPropVal.Value = mapFontWeight( pWeight->getFontWeight() );
+        aPropVal.State = css::beans::PropertyState_DIRECT_VALUE;
+        aRunAttrSeq[ aPropVal.Name ] = aPropVal;
+    }
+    if ( !RequestedAttributes.hasElements() )
+    {
+        rRunAttrSeq = aRunAttrSeq;
+    }
+    else
+    {
+        for ( const OUString& rReqAttr : RequestedAttributes )
+        {
+            tPropValMap::iterator aIter = aRunAttrSeq.find( rReqAttr );
+            if ( aIter != aRunAttrSeq.end() )
+            {
+                rRunAttrSeq[ (*aIter).first ] = (*aIter).second;
+            }
+        }
+    }
+}
+
+css::uno::Sequence< css::beans::PropertyValue >
+Document::retrieveRunAttributes(
+    Paragraph const * pParagraph, ::sal_Int32 Index,
+    const css::uno::Sequence< OUString >& RequestedAttributes)
+{
+    SolarMutexGuard aGuard;
+    ::osl::MutexGuard aInternalGuard( GetMutex() );
+    ::sal_uInt32 nNumber = static_cast< ::sal_uInt32 >( pParagraph->getNumber() );
+        // XXX  numeric overflow
+    if ( Index < 0 || Index >= m_rEngine.GetText(nNumber).getLength() )
+        throw css::lang::IndexOutOfBoundsException(
+            "textwindowaccessibility.cxx:"
+            " Document::retrieveRunAttributes",
+            static_cast< css::uno::XWeak * >( this ) );
+
+    tPropValMap aRunAttrSeq;
+    retrieveRunAttributesImpl( pParagraph, Index, RequestedAttributes, aRunAttrSeq );
+    return comphelper::mapValuesToSequence( aRunAttrSeq );
+}
+
+void Document::changeParagraphText(Paragraph const * pParagraph,
+                                   OUString const & rText)
+{
+    SolarMutexGuard aGuard;
+    {
+        ::osl::MutexGuard aInternalGuard(GetMutex());
+        ::sal_uInt32 nNumber = static_cast< ::sal_uInt32 >(pParagraph->getNumber());
+            // XXX  numeric overflow
+        changeParagraphText(nNumber, 0, m_rEngine.GetTextLen(nNumber), false,
+                            false, rText);
+    }
+}
+
+void Document::changeParagraphText(Paragraph const * pParagraph,
+                                   ::sal_Int32 nBegin, ::sal_Int32 nEnd,
+                                   bool bCut, bool bPaste,
+                                   OUString const & rText)
+{
+    SolarMutexGuard aGuard;
+    {
+        ::osl::MutexGuard aInternalGuard(GetMutex());
+        ::sal_uInt32 nNumber = static_cast< ::sal_uInt32 >(pParagraph->getNumber());
+            // XXX  numeric overflow
+        if (nBegin < 0 || nBegin > nEnd
+            || nEnd > m_rEngine.GetText(nNumber).getLength())
+            throw css::lang::IndexOutOfBoundsException(
+                "textwindowaccessibility.cxx:"
+                " Document::changeParagraphText",
+                static_cast< css::uno::XWeak * >(this));
+        changeParagraphText(nNumber, static_cast< ::sal_uInt16 >(nBegin),
+                            static_cast< ::sal_uInt16 >(nEnd), bCut, bPaste, rText);
+            // XXX  numeric overflow (2x)
+    }
+}
+
+void Document::copyParagraphText(Paragraph const * pParagraph,
+                                 ::sal_Int32 nBegin, ::sal_Int32 nEnd)
+{
+    SolarMutexGuard aGuard;
+    {
+        ::osl::MutexGuard aInternalGuard(GetMutex());
+        ::sal_uInt32 nNumber = static_cast< ::sal_uInt32 >(pParagraph->getNumber());
+            // XXX  numeric overflow
+        if (nBegin < 0 || nBegin > nEnd
+            || nEnd > m_rEngine.GetText(nNumber).getLength())
+            throw css::lang::IndexOutOfBoundsException(
+                "textwindowaccessibility.cxx:"
+                " Document::copyParagraphText",
+                static_cast< css::uno::XWeak * >(this));
+        m_rView.SetSelection(
+            ::TextSelection(::TextPaM(nNumber, nBegin),
+                            ::TextPaM(nNumber, nEnd)));
+            // XXX  numeric overflow (2x)
+        m_rView.Copy();
+    }
+}
+
+void Document::changeParagraphAttributes(
+    Paragraph const * pParagraph, ::sal_Int32 nBegin, ::sal_Int32 nEnd,
+    css::uno::Sequence< css::beans::PropertyValue > const & rAttributeSet)
+{
+    SolarMutexGuard aGuard;
+    {
+        ::osl::MutexGuard aInternalGuard(GetMutex());
+        ::sal_uInt32 nNumber = static_cast< ::sal_uInt32 >(pParagraph->getNumber());
+        // XXX  numeric overflow
+        if (nBegin < 0 || nBegin > nEnd
+            || nEnd > m_rEngine.GetText(nNumber).getLength())
+            throw css::lang::IndexOutOfBoundsException(
+                "textwindowaccessibility.cxx:"
+                " Document::changeParagraphAttributes",
+                static_cast< css::uno::XWeak * >(this));
+
+        // FIXME  The new attributes are added to any attributes already set,
+        // they do not replace the old attributes as required by
+        // XAccessibleEditableText.setAttributes:
+        for (const auto& rAttr : rAttributeSet)
+            if ( rAttr.Name == "CharColor" )
+                m_rEngine.SetAttrib(::TextAttribFontColor(
+                                        mapFontColor(rAttr.Value)),
+                                        nNumber, nBegin, nEnd);
+                    // XXX  numeric overflow (2x)
+            else if ( rAttr.Name == "CharWeight" )
+                m_rEngine.SetAttrib(::TextAttribFontWeight(
+                                        mapFontWeight(rAttr.Value)),
+                                        nNumber, nBegin, nEnd);
+                    // XXX  numeric overflow (2x)
+    }
+}
+
+void Document::changeParagraphSelection(Paragraph const * pParagraph,
+                                        ::sal_Int32 nBegin, ::sal_Int32 nEnd)
+{
+    SolarMutexGuard aGuard;
+    {
+        ::osl::MutexGuard aInternalGuard(GetMutex());
+        ::sal_uInt32 nNumber = static_cast< ::sal_uInt32 >(pParagraph->getNumber());
+            // XXX  numeric overflow
+        if (nBegin < 0 || nBegin > nEnd
+            || nEnd > m_rEngine.GetText(nNumber).getLength())
+            throw css::lang::IndexOutOfBoundsException(
+                "textwindowaccessibility.cxx:"
+                " Document::changeParagraphSelection",
+                static_cast< css::uno::XWeak * >(this));
+        m_rView.SetSelection(
+            ::TextSelection(::TextPaM(nNumber, nBegin),
+                            ::TextPaM(nNumber, nEnd)));
+            // XXX  numeric overflow (2x)
+    }
+}
+
+css::i18n::Boundary
+Document::retrieveParagraphLineBoundary( Paragraph const * pParagraph,
+                                         ::sal_Int32 nIndex, ::sal_Int32 *pLineNo )
+{
+    css::i18n::Boundary aBoundary;
+    aBoundary.startPos = nIndex;
+    aBoundary.endPos = nIndex;
+
+    SolarMutexGuard aGuard;
+    {
+        ::osl::MutexGuard aInternalGuard( GetMutex() );
+        ::sal_uInt32 nNumber = static_cast< ::sal_uInt32 >( pParagraph->getNumber() );
+        if ( nIndex < 0 || nIndex > m_rEngine.GetText( nNumber ).getLength() )
+            throw css::lang::IndexOutOfBoundsException(
+                "textwindowaccessibility.cxx:"
+                " Document::retrieveParagraphLineBoundary",
+                static_cast< css::uno::XWeak * >( this ) );
+        ::sal_Int32 nLineStart = 0;
+        ::sal_Int32 nLineEnd = 0;
+        ::sal_uInt16 nLineCount = m_rEngine.GetLineCount( nNumber );
+        for ( ::sal_uInt16 nLine = 0; nLine < nLineCount; ++nLine )
+        {
+            nLineStart = nLineEnd;
+            nLineEnd += m_rEngine.GetLineLen( nNumber, nLine );
+            if ( nIndex >= nLineStart && ( ( nLine == nLineCount - 1 ) ? nIndex <= nLineEnd : nIndex < nLineEnd ) )
+            {
+                aBoundary.startPos = nLineStart;
+                aBoundary.endPos = nLineEnd;
+                if( pLineNo )
+                    pLineNo[0] = nLine;
+                break;
+            }
+        }
+    }
+
+    return aBoundary;
+}
+
+css::i18n::Boundary
+Document::retrieveParagraphBoundaryOfLine( Paragraph const * pParagraph,
+                                           ::sal_Int32 nLineNo )
+{
+    css::i18n::Boundary aBoundary;
+    aBoundary.startPos = 0;
+    aBoundary.endPos = 0;
+
+    SolarMutexGuard aGuard;
+    {
+        ::osl::MutexGuard aInternalGuard( GetMutex() );
+        ::sal_uInt32 nNumber = static_cast< ::sal_uInt32 >( pParagraph->getNumber() );
+        if ( nLineNo >= m_rEngine.GetLineCount( nNumber ) )
+            throw css::lang::IndexOutOfBoundsException(
+                "textwindowaccessibility.cxx:"
+                " Document::retrieveParagraphBoundaryOfLine",
+                static_cast< css::uno::XWeak * >( this ) );
+        ::sal_Int32 nLineStart = 0;
+        ::sal_Int32 nLineEnd = 0;
+        for ( ::sal_Int32 nLine = 0; nLine <= nLineNo; ++nLine )
+        {
+            nLineStart = nLineEnd;
+            nLineEnd += m_rEngine.GetLineLen( nNumber, nLine );
+        }
+
+        aBoundary.startPos = nLineStart;
+        aBoundary.endPos = nLineEnd;
+    }
+
+    return aBoundary;
+}
+
+sal_Int32 Document::retrieveParagraphLineWithCursor( Paragraph const * pParagraph )
+{
+    SolarMutexGuard aGuard;
+    ::osl::MutexGuard aInternalGuard(GetMutex());
+    ::TextSelection const & rSelection = m_rView.GetSelection();
+    Paragraphs::size_type nNumber = pParagraph->getNumber();
+    TextPaM aEndPaM( rSelection.GetEnd() );
+
+    return aEndPaM.GetPara() == nNumber
+        ? m_rView.GetLineNumberOfCursorInSelection() : -1;
+}
+
+
+css::uno::Reference< css::accessibility::XAccessibleRelationSet >
+Document::retrieveParagraphRelationSet( Paragraph const * pParagraph )
+{
+    ::osl::MutexGuard aInternalGuard( GetMutex() );
+
+    rtl::Reference<::utl::AccessibleRelationSetHelper> pRelationSetHelper = new ::utl::AccessibleRelationSetHelper();
+
+    Paragraphs::iterator aPara( m_xParagraphs->begin() + pParagraph->getNumber() );
+
+    if ( aPara > m_aVisibleBegin && aPara < m_aVisibleEnd )
+    {
+        css::uno::Sequence< css::uno::Reference< css::uno::XInterface > > aSequence { getAccessibleChild( aPara - 1 ) };
+        css::accessibility::AccessibleRelation aRelation( css::accessibility::AccessibleRelationType::CONTENT_FLOWS_FROM, aSequence );
+        pRelationSetHelper->AddRelation( aRelation );
+    }
+
+    if ( aPara >= m_aVisibleBegin && aPara < m_aVisibleEnd -1 )
+    {
+        css::uno::Sequence< css::uno::Reference< css::uno::XInterface > > aSequence { getAccessibleChild( aPara + 1 ) };
+        css::accessibility::AccessibleRelation aRelation( css::accessibility::AccessibleRelationType::CONTENT_FLOWS_TO, aSequence );
+        pRelationSetHelper->AddRelation( aRelation );
+    }
+
+    return pRelationSetHelper;
+}
+
+// virtual
+::sal_Int32 SAL_CALL Document::getAccessibleChildCount()
+{
+    ::comphelper::OExternalLockGuard aGuard(this);
+    init();
+    return m_aVisibleEnd - m_aVisibleBegin;
+}
+
+// virtual
+css::uno::Reference< css::accessibility::XAccessible > SAL_CALL
+Document::getAccessibleChild(::sal_Int32 i)
+{
+    ::comphelper::OExternalLockGuard aGuard(this);
+    init();
+    if (i < 0 || i >= m_aVisibleEnd - m_aVisibleBegin)
+        throw css::lang::IndexOutOfBoundsException(
+            "textwindowaccessibility.cxx:"
+            " Document::getAccessibleChild",
+            static_cast< css::uno::XWeak * >(this));
+    return getAccessibleChild(m_aVisibleBegin
+                              + static_cast< Paragraphs::size_type >(i));
+}
+
+// virtual
+::sal_Int16 SAL_CALL Document::getAccessibleRole()
+{
+    return css::accessibility::AccessibleRole::TEXT_FRAME;
+}
+
+// virtual
+css::uno::Reference< css::accessibility::XAccessible > SAL_CALL
+Document::getAccessibleAtPoint(css::awt::Point const & rPoint)
+{
+    ::comphelper::OExternalLockGuard aGuard(this);
+    init();
+    if (rPoint.X >= 0
+        && rPoint.X < m_rView.GetWindow()->GetOutputSizePixel().Width()
+        && rPoint.Y >= 0 && rPoint.Y < m_nViewHeight)
+    {
+        ::sal_Int32 nOffset = m_nViewOffset + rPoint.Y; // XXX  numeric overflow
+        ::sal_Int32 nPos = m_nViewOffset - m_nVisibleBeginOffset;
+        for (Paragraphs::iterator aIt(m_aVisibleBegin); aIt != m_aVisibleEnd;
+             ++aIt)
+        {
+            nPos += aIt->getHeight(); // XXX  numeric overflow
+            if (nOffset < nPos)
+                return getAccessibleChild(aIt);
+        }
+    }
+    return nullptr;
+}
+void Document::FillAccessibleStateSet( utl::AccessibleStateSetHelper& rStateSet )
+{
+    VCLXAccessibleComponent::FillAccessibleStateSet( rStateSet );
+    if (!m_rView.IsReadOnly())
+        rStateSet.AddState( css::accessibility::AccessibleStateType::EDITABLE );
+}
+
+void    Document::FillAccessibleRelationSet( utl::AccessibleRelationSetHelper& rRelationSet )
+{
+    if( getAccessibleParent()->getAccessibleContext()->getAccessibleRole() == css::accessibility::AccessibleRole::SCROLL_PANE )
+    {
+        css::uno::Sequence< css::uno::Reference< css::uno::XInterface > > aSequence {  getAccessibleParent() };
+        rRelationSet.AddRelation( css::accessibility::AccessibleRelation( css::accessibility::AccessibleRelationType::MEMBER_OF, aSequence ) );
+    }
+    else
+    {
+         VCLXAccessibleComponent::FillAccessibleRelationSet(rRelationSet);
+    }
+}
+// virtual
+void SAL_CALL Document::disposing()
+{
+    m_aEngineListener.endListening();
+    m_aViewListener.endListening();
+    if (m_xParagraphs != nullptr)
+        disposeParagraphs();
+    VCLXAccessibleComponent::disposing();
+}
+
+// virtual
+void Document::Notify(::SfxBroadcaster &, ::SfxHint const & rHint)
+{
+    const TextHint* pTextHint = dynamic_cast<const TextHint*>(&rHint);
+    if (!pTextHint)
+        return;
+
+    ::TextHint const & rTextHint = *pTextHint;
+    switch (rTextHint.GetId())
+    {
+    case SfxHintId::TextParaInserted:
+    case SfxHintId::TextParaRemoved:
+        // SfxHintId::TextParaInserted and SfxHintId::TextParaRemoved are sent at
+        // "unsafe" times (when the text engine has not yet re-formatted its
+        // content), so that for example calling ::TextEngine::GetTextHeight
+        // from within the code that handles SfxHintId::TextParaInserted causes
+        // trouble within the text engine.  Therefore, these hints are just
+        // buffered until a following ::TextEngine::FormatDoc causes a
+        // SfxHintId::TextFormatted to come in:
+    case SfxHintId::TextFormatPara:
+        // ::TextEngine::FormatDoc sends a sequence of
+        // SfxHintId::TextFormatParas, followed by an optional
+        // SfxHintId::TextHeightChanged, followed in all cases by one
+        // SfxHintId::TextFormatted.  Only the SfxHintId::TextFormatParas contain
+        // the numbers of the affected paragraphs, but they are sent
+        // before the changes are applied.  Therefore, SfxHintId::TextFormatParas
+        // are just buffered until another hint comes in:
+        {
+            ::osl::MutexGuard aInternalGuard(GetMutex());
+            if (!isAlive())
+                break;
+
+            m_aParagraphNotifications.push(rTextHint);
+            break;
+        }
+    case SfxHintId::TextFormatted:
+    case SfxHintId::TextHeightChanged:
+    case SfxHintId::TextModified:
+        {
+            ::osl::MutexGuard aInternalGuard(GetMutex());
+            if (!isAlive())
+                break;
+            handleParagraphNotifications();
+            break;
+        }
+    case SfxHintId::TextViewScrolled:
+        {
+            ::osl::MutexGuard aInternalGuard(GetMutex());
+            if (!isAlive())
+                break;
+            handleParagraphNotifications();
+
+            ::sal_Int32 nOffset = static_cast< ::sal_Int32 >(
+                m_rView.GetStartDocPos().Y());
+                // XXX  numeric overflow
+            if (nOffset != m_nViewOffset)
+            {
+                m_nViewOffset = nOffset;
+
+                Paragraphs::iterator aOldVisibleBegin(
+                    m_aVisibleBegin);
+                Paragraphs::iterator aOldVisibleEnd(m_aVisibleEnd);
+
+                determineVisibleRange();
+
+                notifyVisibleRangeChanges(aOldVisibleBegin,
+                                            aOldVisibleEnd,
+                                            m_xParagraphs->end());
+            }
+            break;
+        }
+    case SfxHintId::TextViewSelectionChanged:
+    case SfxHintId::TextViewCaretChanged:
+        {
+            ::osl::MutexGuard aInternalGuard(GetMutex());
+            if (!isAlive())
+                break;
+
+            if (m_aParagraphNotifications.empty())
+            {
+                handleSelectionChangeNotification();
+            }
+            else
+            {
+                // SfxHintId::TextViewSelectionChanged is sometimes sent at
+                // "unsafe" times (when the text engine has not yet re-
+                // formatted its content), so that for example calling
+                // ::TextEngine::GetTextHeight from within the code that
+                // handles a previous SfxHintId::TextParaInserted causes
+                // trouble within the text engine.  Therefore, these
+                // hints are just buffered (along with
+                // SfxHintId::TextParaInserted/REMOVED/FORMATPARA) until a
+                // following ::TextEngine::FormatDoc causes a
+                // SfxHintId::TextFormatted to come in:
+                m_bSelectionChangedNotification = true;
+            }
+            break;
+        }
+    default: break;
+    }
+}
+
+IMPL_LINK(Document, WindowEventHandler, ::VclWindowEvent&, rEvent, void)
+{
+    switch (rEvent.GetId())
+    {
+    case VclEventId::WindowResize:
+        {
+            ::osl::MutexGuard aInternalGuard(GetMutex());
+            if (!isAlive())
+                break;
+
+            ::sal_Int32 nHeight = static_cast< ::sal_Int32 >(
+                m_rView.GetWindow()->GetOutputSizePixel().Height());
+                // XXX  numeric overflow
+            if (nHeight != m_nViewHeight)
+            {
+                m_nViewHeight = nHeight;
+
+                Paragraphs::iterator aOldVisibleBegin(m_aVisibleBegin);
+                Paragraphs::iterator aOldVisibleEnd(m_aVisibleEnd);
+
+                determineVisibleRange();
+
+                notifyVisibleRangeChanges(aOldVisibleBegin, aOldVisibleEnd,
+                                            m_xParagraphs->end());
+            }
+            break;
+        }
+    case VclEventId::WindowGetFocus:
+        {
+            ::osl::MutexGuard aInternalGuard(GetMutex());
+            if (!isAlive())
+                break;
+            //to enable the PARAGRAPH to get focus for multiline edit
+            ::sal_Int32 count = getAccessibleChildCount();
+            bool bEmpty = m_aFocused == m_aVisibleEnd && count == 1;
+            if ((m_aFocused >= m_aVisibleBegin && m_aFocused < m_aVisibleEnd) || bEmpty)
+            {
+                Paragraphs::iterator aTemp = bEmpty ? m_aVisibleBegin : m_aFocused;
+                ::rtl::Reference< Paragraph > xParagraph(getParagraph(aTemp));
+                if (xParagraph.is())
+                {
+                    xParagraph->notifyEvent(
+                        css::accessibility::AccessibleEventId::
+                        STATE_CHANGED,
+                        css::uno::Any(),
+                        css::uno::Any(
+                            css::accessibility::AccessibleStateType::
+                            FOCUSED));
+                }
+            }
+            break;
+        }
+    case VclEventId::WindowLoseFocus:
+        {
+            ::osl::MutexGuard aInternalGuard(GetMutex());
+            if (!isAlive())
+                break;
+            //to enable the PARAGRAPH to get focus for multiline edit
+            ::sal_Int32 count = getAccessibleChildCount();
+            bool bEmpty = m_aFocused == m_aVisibleEnd && count == 1;
+            if ((m_aFocused >= m_aVisibleBegin && m_aFocused < m_aVisibleEnd) || bEmpty)
+            {
+                Paragraphs::iterator aTemp = bEmpty ? m_aVisibleBegin : m_aFocused;
+                ::rtl::Reference< Paragraph > xParagraph(getParagraph(aTemp));
+                if (xParagraph.is())
+                    xParagraph->notifyEvent(
+                        css::accessibility::AccessibleEventId::
+                        STATE_CHANGED,
+                        css::uno::Any(
+                            css::accessibility::AccessibleStateType::
+                            FOCUSED),
+                        css::uno::Any());
+            }
+            break;
+        }
+    default: break;
+    }
+}
+
+void Document::init()
+{
+    if (m_xParagraphs != nullptr)
+        return;
+
+    const ::sal_uInt32 nCount = m_rEngine.GetParagraphCount();
+    m_xParagraphs.reset(new Paragraphs);
+    m_xParagraphs->reserve(static_cast< Paragraphs::size_type >(nCount));
+        // numeric overflow is harmless here
+    for (::sal_uInt32 i = 0; i < nCount; ++i)
+        m_xParagraphs->push_back(ParagraphInfo(static_cast< ::sal_Int32 >(
+                                       m_rEngine.GetTextHeight(i))));
+            // XXX  numeric overflow
+    m_nViewOffset = static_cast< ::sal_Int32 >(
+        m_rView.GetStartDocPos().Y()); // XXX  numeric overflow
+    m_nViewHeight = static_cast< ::sal_Int32 >(
+        m_rView.GetWindow()->GetOutputSizePixel().Height());
+        // XXX  numeric overflow
+    determineVisibleRange();
+    m_nSelectionFirstPara = -1;
+    m_nSelectionFirstPos = -1;
+    m_nSelectionLastPara = -1;
+    m_nSelectionLastPos = -1;
+    m_aFocused = m_xParagraphs->end();
+    m_bSelectionChangedNotification = false;
+    m_aEngineListener.startListening(m_rEngine);
+    m_aViewListener.startListening(*m_rView.GetWindow());
+}
+
+::rtl::Reference< Paragraph >
+Document::getParagraph(Paragraphs::iterator const & rIt)
+{
+    return static_cast< Paragraph * >(
+        css::uno::Reference< css::accessibility::XAccessible >(
+            rIt->getParagraph()).get());
+}
+
+css::uno::Reference< css::accessibility::XAccessible >
+Document::getAccessibleChild(Paragraphs::iterator const & rIt)
+{
+    css::uno::Reference< css::accessibility::XAccessible > xParagraph(
+        rIt->getParagraph());
+    if (!xParagraph.is())
+    {
+        xParagraph = new Paragraph(this, rIt - m_xParagraphs->begin());
+        rIt->setParagraph(xParagraph);
+    }
+    return xParagraph;
+}
+
+void Document::determineVisibleRange()
+{
+    Paragraphs::iterator const aEnd = m_xParagraphs->end();
+
+    m_aVisibleBegin = aEnd;
+    m_aVisibleEnd = aEnd;
+    m_nVisibleBeginOffset = 0;
+
+    ::sal_Int32 nPos = 0;
+    for (Paragraphs::iterator aIt = m_xParagraphs->begin(); m_aVisibleEnd == aEnd && aIt != aEnd; ++aIt)
+    {
+        ::sal_Int32 const nOldPos = nPos;
+        nPos += aIt->getHeight(); // XXX  numeric overflow
+        if (m_aVisibleBegin == aEnd)
+        {
+            if (nPos >= m_nViewOffset)
+            {
+                m_aVisibleBegin = aIt;
+                m_nVisibleBeginOffset = m_nViewOffset - nOldPos;
+            }
+        }
+        else
+        {
+            if (nPos >= m_nViewOffset + m_nViewHeight) // XXX  numeric overflow
+            {
+                m_aVisibleEnd = aIt;
+            }
+        }
+    }
+
+    SAL_WARN_IF(
+            !((m_aVisibleBegin == m_xParagraphs->end() && m_aVisibleEnd == m_xParagraphs->end() && m_nVisibleBeginOffset == 0)
+                || (m_aVisibleBegin < m_aVisibleEnd && m_nVisibleBeginOffset >= 0)),
+            "accessibility",
+            "invalid visible range");
+}
+
+void Document::notifyVisibleRangeChanges(
+    Paragraphs::iterator const & rOldVisibleBegin,
+    Paragraphs::iterator const & rOldVisibleEnd,
+    Paragraphs::iterator const & rInserted)
+{
+    // XXX  Replace this code that determines which paragraphs have changed from
+    // invisible to visible or vice versa with a better algorithm.
+    for (Paragraphs::iterator aIt(rOldVisibleBegin); aIt != rOldVisibleEnd;
+         ++aIt)
+    {
+        if (aIt != rInserted
+            && (aIt < m_aVisibleBegin || aIt >= m_aVisibleEnd))
+            NotifyAccessibleEvent(
+                css::accessibility::AccessibleEventId::
+                CHILD,
+                css::uno::Any(getAccessibleChild(aIt)),
+                css::uno::Any());
+    }
+    for (Paragraphs::iterator aIt(m_aVisibleBegin); aIt != m_aVisibleEnd;
+         ++aIt)
+    {
+        if (aIt == rInserted
+            || aIt < rOldVisibleBegin || aIt >= rOldVisibleEnd)
+            NotifyAccessibleEvent(
+                css::accessibility::AccessibleEventId::
+                CHILD,
+                css::uno::Any(),
+                css::uno::Any(getAccessibleChild(aIt)));
+    }
+}
+
+void
+Document::changeParagraphText(::sal_uInt32 nNumber, ::sal_uInt16 nBegin, ::sal_uInt16 nEnd,
+                              bool bCut, bool bPaste,
+                              OUString const & rText)
+{
+    m_rView.SetSelection(::TextSelection(::TextPaM(nNumber, nBegin),
+                                         ::TextPaM(nNumber, nEnd)));
+    if (bCut)
+        m_rView.Cut();
+    else if (nBegin != nEnd)
+        m_rView.DeleteSelected();
+    if (bPaste)
+        m_rView.Paste();
+    else if (!rText.isEmpty())
+        m_rView.InsertText(rText);
+}
+
+void Document::handleParagraphNotifications()
+{
+    while (!m_aParagraphNotifications.empty())
+    {
+        ::TextHint aHint(m_aParagraphNotifications.front());
+        m_aParagraphNotifications.pop();
+        switch (aHint.GetId())
+        {
+        case SfxHintId::TextParaInserted:
+            {
+                ::sal_uInt32 n = static_cast< ::sal_uInt32 >( aHint.GetValue() );
+                assert(n <= m_xParagraphs->size() && "bad SfxHintId::TextParaInserted event");
+
+                // Save the values of old iterators (the iterators themselves
+                // will get invalidated), and adjust the old values so that they
+                // reflect the insertion of the new paragraph:
+                Paragraphs::size_type nOldVisibleBegin
+                    = m_aVisibleBegin - m_xParagraphs->begin();
+                Paragraphs::size_type nOldVisibleEnd
+                    = m_aVisibleEnd - m_xParagraphs->begin();
+                Paragraphs::size_type nOldFocused
+                    = m_aFocused - m_xParagraphs->begin();
+                if (n <= nOldVisibleBegin)
+                    ++nOldVisibleBegin; // XXX  numeric overflow
+                if (n <= nOldVisibleEnd)
+                    ++nOldVisibleEnd; // XXX  numeric overflow
+                if (n <= nOldFocused)
+                    ++nOldFocused; // XXX  numeric overflow
+                if (sal::static_int_cast<sal_Int32>(n) <= m_nSelectionFirstPara)
+                    ++m_nSelectionFirstPara; // XXX  numeric overflow
+                if (sal::static_int_cast<sal_Int32>(n) <= m_nSelectionLastPara)
+                    ++m_nSelectionLastPara; // XXX  numeric overflow
+
+                Paragraphs::iterator aIns(
+                    m_xParagraphs->insert(
+                        m_xParagraphs->begin() + n,
+                        ParagraphInfo(static_cast< ::sal_Int32 >(
+                                          m_rEngine.GetTextHeight(n)))));
+                    // XXX  numeric overflow (2x)
+
+                determineVisibleRange();
+                m_aFocused = m_xParagraphs->begin() + nOldFocused;
+
+                for (Paragraphs::iterator aIt(aIns);;)
+                {
+                    ++aIt;
+                    if (aIt == m_xParagraphs->end())
+                        break;
+                    ::rtl::Reference< Paragraph > xParagraph(
+                        getParagraph(aIt));
+                    if (xParagraph.is())
+                        xParagraph->numberChanged(true);
+                }
+
+                notifyVisibleRangeChanges(
+                    m_xParagraphs->begin() + nOldVisibleBegin,
+                    m_xParagraphs->begin() + nOldVisibleEnd, aIns);
+                break;
+            }
+        case SfxHintId::TextParaRemoved:
+            {
+                ::sal_uInt32 n = static_cast< ::sal_uInt32 >( aHint.GetValue() );
+                if (n == TEXT_PARA_ALL)
+                {
+                    for (Paragraphs::iterator aIt(m_aVisibleBegin);
+                         aIt != m_aVisibleEnd; ++aIt)
+                    {
+                        NotifyAccessibleEvent(
+                            css::accessibility::AccessibleEventId::
+                            CHILD,
+                            css::uno::Any(getAccessibleChild(aIt)),
+                            css::uno::Any());
+                    }
+                    disposeParagraphs();
+                    m_xParagraphs->clear();
+                    determineVisibleRange();
+                    m_nSelectionFirstPara = -1;
+                    m_nSelectionFirstPos = -1;
+                    m_nSelectionLastPara = -1;
+                    m_nSelectionLastPos = -1;
+                    m_aFocused = m_xParagraphs->end();
+                }
+                else
+                {
+                    assert(n < m_xParagraphs->size() && "Bad SfxHintId::TextParaRemoved event");
+
+                    Paragraphs::iterator aIt(m_xParagraphs->begin() + n);
+                        // numeric overflow cannot occur
+
+                    // Save the values of old iterators (the iterators
+                    // themselves will get invalidated), and adjust the old
+                    // values so that they reflect the removal of the paragraph:
+                    Paragraphs::size_type nOldVisibleBegin
+                        = m_aVisibleBegin - m_xParagraphs->begin();
+                    Paragraphs::size_type nOldVisibleEnd
+                        = m_aVisibleEnd - m_xParagraphs->begin();
+                    bool bWasVisible
+                        = nOldVisibleBegin <= n && n < nOldVisibleEnd;
+                    Paragraphs::size_type nOldFocused
+                        = m_aFocused - m_xParagraphs->begin();
+                    bool bWasFocused = aIt == m_aFocused;
+                    if (n < nOldVisibleBegin)
+                        --nOldVisibleBegin;
+                    if (n < nOldVisibleEnd)
+                        --nOldVisibleEnd;
+                    if (n < nOldFocused)
+                        --nOldFocused;
+                    if (sal::static_int_cast<sal_Int32>(n) < m_nSelectionFirstPara)
+                        --m_nSelectionFirstPara;
+                    else if (sal::static_int_cast<sal_Int32>(n) == m_nSelectionFirstPara)
+                    {
+                        if (m_nSelectionFirstPara == m_nSelectionLastPara)
+                        {
+                            m_nSelectionFirstPara = -1;
+                            m_nSelectionFirstPos = -1;
+                            m_nSelectionLastPara = -1;
+                            m_nSelectionLastPos = -1;
+                        }
+                        else
+                        {
+                            ++m_nSelectionFirstPara;
+                            m_nSelectionFirstPos = 0;
+                        }
+                    }
+                    if (sal::static_int_cast<sal_Int32>(n) < m_nSelectionLastPara)
+                        --m_nSelectionLastPara;
+                    else if (sal::static_int_cast<sal_Int32>(n) == m_nSelectionLastPara)
+                    {
+                        assert(m_nSelectionFirstPara < m_nSelectionLastPara && "logic error");
+                        --m_nSelectionLastPara;
+                        m_nSelectionLastPos = 0x7FFFFFFF;
+                    }
+
+                    css::uno::Reference< css::accessibility::XAccessible >
+                          xStrong;
+                    if (bWasVisible)
+                        xStrong = getAccessibleChild(aIt);
+                    css::uno::WeakReference<
+                          css::accessibility::XAccessible > xWeak(
+                              aIt->getParagraph());
+                    aIt = m_xParagraphs->erase(aIt);
+
+                    determineVisibleRange();
+                    m_aFocused = bWasFocused ? m_xParagraphs->end()
+                        : m_xParagraphs->begin() + nOldFocused;
+
+                    for (; aIt != m_xParagraphs->end(); ++aIt)
+                    {
+                        ::rtl::Reference< Paragraph > xParagraph(
+                            getParagraph(aIt));
+                        if (xParagraph.is())
+                            xParagraph->numberChanged(false);
+                    }
+
+                    if (bWasVisible)
+                        NotifyAccessibleEvent(
+                            css::accessibility::AccessibleEventId::
+                            CHILD,
+                            css::uno::Any(xStrong),
+                            css::uno::Any());
+
+                    css::uno::Reference< css::lang::XComponent > xComponent(
+                        xWeak.get(), css::uno::UNO_QUERY);
+                    if (xComponent.is())
+                        xComponent->dispose();
+
+                    notifyVisibleRangeChanges(
+                        m_xParagraphs->begin() + nOldVisibleBegin,
+                        m_xParagraphs->begin() + nOldVisibleEnd,
+                        m_xParagraphs->end());
+                }
+                break;
+            }
+        case SfxHintId::TextFormatPara:
+            {
+                ::sal_uInt32 n = static_cast< ::sal_uInt32 >( aHint.GetValue() );
+                assert(n < m_xParagraphs->size() && "Bad SfxHintId::TextFormatPara event");
+
+                (*m_xParagraphs)[static_cast< Paragraphs::size_type >(n)].
+                    changeHeight(static_cast< ::sal_Int32 >(
+                                     m_rEngine.GetTextHeight(n)));
+                    // XXX  numeric overflow
+                Paragraphs::iterator aOldVisibleBegin(m_aVisibleBegin);
+                Paragraphs::iterator aOldVisibleEnd(m_aVisibleEnd);
+                determineVisibleRange();
+                notifyVisibleRangeChanges(aOldVisibleBegin, aOldVisibleEnd,
+                                          m_xParagraphs->end());
+
+                if (n < m_xParagraphs->size())
+                {
+                    Paragraphs::iterator aIt(m_xParagraphs->begin() + n);
+                    ::rtl::Reference< Paragraph > xParagraph(getParagraph(aIt));
+                    if (xParagraph.is())
+                        xParagraph->textChanged();
+                }
+                break;
+            }
+        default:
+            SAL_WARN("accessibility", "bad buffered hint");
+            break;
+        }
+    }
+    if (m_bSelectionChangedNotification)
+    {
+        m_bSelectionChangedNotification = false;
+        handleSelectionChangeNotification();
+    }
+}
+
+namespace
+{
+
+enum class SelChangeType
+{
+    None, // no change, or invalid
+    CaretMove, // neither old nor new have selection, and they are different
+    NoSelToSel, // old has no selection but new has selection
+    SelToNoSel, // old has selection but new has no selection
+    // both old and new have selections
+    NoParaChange, // only end index changed inside end para
+    EndParaNoMoreBehind, // end para was behind start, but now is same or ahead
+    AddedFollowingPara, // selection extended to following paragraph(s)
+    ExcludedPreviousPara, // selection shrunk excluding previous paragraph(s)
+    ExcludedFollowingPara, // selection shrunk excluding following paragraph(s)
+    AddedPreviousPara, // selection extended to previous paragraph(s)
+    EndParaBecameBehind // end para was ahead of start, but now is behind
+};
+
+SelChangeType getSelChangeType(const TextPaM& Os, const TextPaM& Oe,
+                               const TextPaM& Ns, const TextPaM& Ne)
+{
+    if (Os == Oe) // no old selection
+    {
+        if (Ns == Ne) // no new selection: only caret moves
+            return Os != Ns ? SelChangeType::CaretMove : SelChangeType::None;
+        else // old has no selection but new has selection
+            return SelChangeType::NoSelToSel;
+    }
+    else if (Ns == Ne) // old has selection; no new selection
+    {
+        return SelChangeType::SelToNoSel;
+    }
+    else if (Os == Ns) // both old and new have selections, and their starts are same
+    {
+        const sal_Int32 Osp = Os.GetPara(), Oep = Oe.GetPara();
+        const sal_Int32 Nsp = Ns.GetPara(), Nep = Ne.GetPara();
+        if (Oep == Nep) // end of selection stays in the same paragraph
+        {
+            //Send text_selection_change event on Nep
+            return Oe.GetIndex() != Ne.GetIndex() ? SelChangeType::NoParaChange
+                                                  : SelChangeType::None;
+        }
+        else if (Oep < Nep) // end of selection moved to a following paragraph
+        {
+            //all the following examples like 1,2->1,3 means that old start select para is 1, old end select para is 2,
+            // then press shift up, the new start select para is 1, new end select para is 3;
+            //for example, 1, 2 -> 1, 3; 4,1 -> 4, 7; 4,1 -> 4, 2; 4,4->4,5
+            if (Nep >= Nsp) // new end para not behind start
+            {
+                // 1, 2 -> 1, 3; 4, 1 -> 4, 7; 4,4->4,5;
+                if (Oep < Osp) // old end was behind start
+                {
+                    // 4,1 -> 4,7; 4,1 -> 4,4
+                    return SelChangeType::EndParaNoMoreBehind;
+                }
+                else // old end para wasn't behind start
+                {
+                    // 1, 2 -> 1, 3; 4,4->4,5;
+                    return SelChangeType::AddedFollowingPara;
+                }
+            }
+            else // new end para is still behind start
+            {
+                // 4,1 -> 4,2,
+                return SelChangeType::ExcludedPreviousPara;
+            }
+        }
+        else // Oep > Nep => end of selection moved to a previous paragraph
+        {
+            // 3,2 -> 3,1; 4,7 -> 4,1; 4, 7 -> 4,6; 4,4 -> 4,3
+            if (Nep >= Nsp) // new end para is still not behind of start
+            {
+                // 4,7 ->4,6
+                return SelChangeType::ExcludedFollowingPara;
+            }
+            else // new end para is behind start
+            {
+                // 3,2 -> 3,1, 4,7 -> 4,1; 4,4->4,3
+                if (Oep <= Osp) // it was not ahead already
+                {
+                    // 3,2 -> 3,1; 4,4->4,3
+                    return SelChangeType::AddedPreviousPara;
+                }
+                else // it was ahead previously
+                {
+                    // 4,7 -> 4,1
+                    return SelChangeType::EndParaBecameBehind;
+                }
+            }
+        }
+    }
+    return SelChangeType::None;
+}
+
+} // namespace
+
+void Document::sendEvent(::sal_Int32 start, ::sal_Int32 end, ::sal_Int16 nEventId)
+{
+    size_t nAvailDistance = std::distance(m_xParagraphs->begin(), m_aVisibleEnd);
+
+    Paragraphs::iterator aEnd(m_xParagraphs->begin());
+    size_t nEndDistance = std::min<size_t>(end + 1, nAvailDistance);
+    std::advance(aEnd, nEndDistance);
+
+    Paragraphs::iterator aIt(m_xParagraphs->begin());
+    size_t nStartDistance = std::min<size_t>(start, nAvailDistance);
+    std::advance(aIt, nStartDistance);
+
+    while (aIt < aEnd)
+    {
+        ::rtl::Reference< Paragraph > xParagraph(getParagraph(aIt));
+        if (xParagraph.is())
+            xParagraph->notifyEvent(
+            nEventId,
+                css::uno::Any(), css::uno::Any());
+        ++aIt;
+    }
+}
+
+void Document::handleSelectionChangeNotification()
+{
+    ::TextSelection const & rSelection = m_rView.GetSelection();
+    assert(rSelection.GetStart().GetPara() < m_xParagraphs->size() &&
+           rSelection.GetEnd().GetPara() < m_xParagraphs->size() &&
+           "bad SfxHintId::TextViewSelectionChanged event");
+    ::sal_Int32 nNewFirstPara
+          = static_cast< ::sal_Int32 >(rSelection.GetStart().GetPara());
+    ::sal_Int32 nNewFirstPos = rSelection.GetStart().GetIndex();
+        // XXX  numeric overflow
+    ::sal_Int32 nNewLastPara
+          = static_cast< ::sal_Int32 >(rSelection.GetEnd().GetPara());
+    ::sal_Int32 nNewLastPos = rSelection.GetEnd().GetIndex();
+        // XXX  numeric overflow
+
+    // Lose focus:
+    Paragraphs::iterator aIt(m_xParagraphs->begin() + nNewLastPara);
+    if (m_aFocused != m_xParagraphs->end() && m_aFocused != aIt
+        && m_aFocused >= m_aVisibleBegin && m_aFocused < m_aVisibleEnd)
+    {
+        ::rtl::Reference< Paragraph > xParagraph(getParagraph(m_aFocused));
+        if (xParagraph.is())
+            xParagraph->notifyEvent(
+                css::accessibility::AccessibleEventId::
+                STATE_CHANGED,
+                css::uno::Any(
+                    css::accessibility::AccessibleStateType::FOCUSED),
+                css::uno::Any());
+    }
+
+    // Gain focus and update cursor position:
+    if (aIt >= m_aVisibleBegin && aIt < m_aVisibleEnd
+        && (aIt != m_aFocused
+            || nNewLastPara != m_nSelectionLastPara
+            || nNewLastPos != m_nSelectionLastPos))
+    {
+        ::rtl::Reference< Paragraph > xParagraph(getParagraph(aIt));
+        if (xParagraph.is())
+        {
+            //disable the first event when user types in empty field.
+            ::sal_Int32 count = getAccessibleChildCount();
+            bool bEmpty = count > 1;
+            //if (aIt != m_aFocused)
+            if (aIt != m_aFocused && bEmpty)
+                xParagraph->notifyEvent(
+                    css::accessibility::AccessibleEventId::
+                    STATE_CHANGED,
+                    css::uno::Any(),
+                    css::uno::Any(
+                        css::accessibility::AccessibleStateType::FOCUSED));
+            if (nNewLastPara != m_nSelectionLastPara
+                || nNewLastPos != m_nSelectionLastPos)
+                xParagraph->notifyEvent(
+                    css::accessibility::AccessibleEventId::
+                    CARET_CHANGED,
+                    css::uno::Any( ::sal_Int32 (
+                        nNewLastPara == m_nSelectionLastPara
+                        ? m_nSelectionLastPos : 0)),
+                    css::uno::Any(nNewLastPos));
+        }
+    }
+    m_aFocused = aIt;
+
+    if (m_nSelectionFirstPara != -1)
+    {
+        sal_Int32 nMin;
+        sal_Int32 nMax;
+        SelChangeType ret = getSelChangeType(TextPaM(m_nSelectionFirstPara, m_nSelectionFirstPos),
+                                             TextPaM(m_nSelectionLastPara, m_nSelectionLastPos),
+                                             rSelection.GetStart(), rSelection.GetEnd());
+        switch (ret)
+        {
+            case SelChangeType::None:
+                //no event
+                break;
+            case SelChangeType::CaretMove:
+                //only caret moved, already handled in above
+                break;
+            case SelChangeType::NoSelToSel:
+                //old has no selection but new has selection
+                nMin = std::min(nNewFirstPara, nNewLastPara);
+                nMax = std::max(nNewFirstPara, nNewLastPara);
+                sendEvent(nMin, nMax, css::accessibility::AccessibleEventId::SELECTION_CHANGED);
+                sendEvent(nMin, nMax,
+                          css::accessibility::AccessibleEventId::TEXT_SELECTION_CHANGED);
+                break;
+            case SelChangeType::SelToNoSel:
+                //old has selection but new has no selection.
+                nMin = std::min(m_nSelectionFirstPara, m_nSelectionLastPara);
+                nMax = std::max(m_nSelectionFirstPara, m_nSelectionLastPara);
+                sendEvent(nMin, nMax, css::accessibility::AccessibleEventId::SELECTION_CHANGED);
+                sendEvent(nMin, nMax,
+                          css::accessibility::AccessibleEventId::TEXT_SELECTION_CHANGED);
+                break;
+            case SelChangeType::NoParaChange:
+                //Send text_selection_change event on Nep
+                sendEvent(nNewLastPara, nNewLastPara,
+                          css::accessibility::AccessibleEventId::TEXT_SELECTION_CHANGED);
+                break;
+            case SelChangeType::EndParaNoMoreBehind:
+                // 4, 1 -> 4, 7; 4,1 -> 4,4
+                sendEvent(m_nSelectionLastPara, m_nSelectionFirstPara - 1,
+                          css::accessibility::AccessibleEventId::SELECTION_CHANGED);
+                sendEvent(nNewFirstPara + 1, nNewLastPara,
+                          css::accessibility::AccessibleEventId::SELECTION_CHANGED);
+
+                sendEvent(m_nSelectionLastPara, nNewLastPara,
+                          css::accessibility::AccessibleEventId::TEXT_SELECTION_CHANGED);
+                break;
+            case SelChangeType::AddedFollowingPara:
+                // 1, 2 -> 1, 4; 4,4->4,5;
+                sendEvent(m_nSelectionLastPara + 1, nNewLastPara,
+                          css::accessibility::AccessibleEventId::SELECTION_CHANGED);
+
+                sendEvent(m_nSelectionLastPara, nNewLastPara,
+                          css::accessibility::AccessibleEventId::TEXT_SELECTION_CHANGED);
+                break;
+            case SelChangeType::ExcludedPreviousPara:
+                // 4,1 -> 4,3,
+                sendEvent(m_nSelectionLastPara + 1, nNewLastPara,
+                          css::accessibility::AccessibleEventId::SELECTION_CHANGED);
+
+                sendEvent(m_nSelectionLastPara, nNewLastPara,
+                          css::accessibility::AccessibleEventId::TEXT_SELECTION_CHANGED);
+                break;
+            case SelChangeType::ExcludedFollowingPara:
+                // 4,7 ->4,5;
+                sendEvent(nNewLastPara + 1, m_nSelectionLastPara,
+                          css::accessibility::AccessibleEventId::SELECTION_CHANGED);
+
+                sendEvent(nNewLastPara, m_nSelectionLastPara,
+                          css::accessibility::AccessibleEventId::TEXT_SELECTION_CHANGED);
+                break;
+            case SelChangeType::AddedPreviousPara:
+                // 3,2 -> 3,1; 4,4->4,3
+                sendEvent(nNewLastPara, m_nSelectionLastPara - 1,
+                          css::accessibility::AccessibleEventId::SELECTION_CHANGED);
+
+                sendEvent(nNewLastPara, m_nSelectionLastPara,
+                          css::accessibility::AccessibleEventId::TEXT_SELECTION_CHANGED);
+                break;
+            case SelChangeType::EndParaBecameBehind:
+                // 4,7 -> 4,1
+                sendEvent(m_nSelectionFirstPara + 1, m_nSelectionLastPara,
+                          css::accessibility::AccessibleEventId::SELECTION_CHANGED);
+                sendEvent(nNewLastPara, nNewFirstPara - 1,
+                          css::accessibility::AccessibleEventId::SELECTION_CHANGED);
+
+                sendEvent(nNewLastPara, m_nSelectionLastPara,
+                          css::accessibility::AccessibleEventId::TEXT_SELECTION_CHANGED);
+                break;
+        }
+    }
+
+    m_nSelectionFirstPara = nNewFirstPara;
+    m_nSelectionFirstPos = nNewFirstPos;
+    m_nSelectionLastPara = nNewLastPara;
+    m_nSelectionLastPos = nNewLastPos;
+}
+
+void Document::disposeParagraphs()
+{
+    for (auto const& paragraph : *m_xParagraphs)
+    {
+        css::uno::Reference< css::lang::XComponent > xComponent(
+            paragraph.getParagraph().get(), css::uno::UNO_QUERY);
+        if (xComponent.is())
+            xComponent->dispose();
+    }
+}
+
+// static
+css::uno::Any Document::mapFontColor(::Color const & rColor)
+{
+    return css::uno::Any(rColor.GetRGBColor());
+        // FIXME  keep transparency?
+}
+
+// static
+::Color Document::mapFontColor(css::uno::Any const & rColor)
+{
+    ::Color nColor;
+    rColor >>= nColor;
+    return nColor;
+}
+
+// static
+css::uno::Any Document::mapFontWeight(::FontWeight nWeight)
+{
+    // Map from ::FontWeight to css::awt::FontWeight, depends on order of
+    // elements in ::FontWeight (vcl/vclenum.hxx):
+    static float const aWeight[]
+        = { css::awt::FontWeight::DONTKNOW, // WEIGHT_DONTKNOW
+            css::awt::FontWeight::THIN, // WEIGHT_THIN
+            css::awt::FontWeight::ULTRALIGHT, // WEIGHT_ULTRALIGHT
+            css::awt::FontWeight::LIGHT, // WEIGHT_LIGHT
+            css::awt::FontWeight::SEMILIGHT, // WEIGHT_SEMILIGHT
+            css::awt::FontWeight::NORMAL, // WEIGHT_NORMAL
+            css::awt::FontWeight::NORMAL, // WEIGHT_MEDIUM
+            css::awt::FontWeight::SEMIBOLD, // WEIGHT_SEMIBOLD
+            css::awt::FontWeight::BOLD, // WEIGHT_BOLD
+            css::awt::FontWeight::ULTRABOLD, // WEIGHT_ULTRABOLD
+            css::awt::FontWeight::BLACK }; // WEIGHT_BLACK
+    return css::uno::Any(aWeight[nWeight]);
+}
+
+// static
+::FontWeight Document::mapFontWeight(css::uno::Any const & rWeight)
+{
+    float nWeight = css::awt::FontWeight::NORMAL;
+    rWeight >>= nWeight;
+    return nWeight <= css::awt::FontWeight::DONTKNOW ? WEIGHT_DONTKNOW
+        : nWeight <= css::awt::FontWeight::THIN ? WEIGHT_THIN
+        : nWeight <= css::awt::FontWeight::ULTRALIGHT ? WEIGHT_ULTRALIGHT
+        : nWeight <= css::awt::FontWeight::LIGHT ? WEIGHT_LIGHT
+        : nWeight <= css::awt::FontWeight::SEMILIGHT ? WEIGHT_SEMILIGHT
+        : nWeight <= css::awt::FontWeight::NORMAL ? WEIGHT_NORMAL
+        : nWeight <= css::awt::FontWeight::SEMIBOLD ? WEIGHT_SEMIBOLD
+        : nWeight <= css::awt::FontWeight::BOLD ? WEIGHT_BOLD
+        : nWeight <= css::awt::FontWeight::ULTRABOLD ? WEIGHT_ULTRABOLD
+        : WEIGHT_BLACK;
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */