AccessibleSlideSorterView.cxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */
 
#include <AccessibleSlideSorterView.hxx>
#include <AccessibleSlideSorterObject.hxx>
 
#include <SlideSorter.hxx>
#include <controller/SlideSorterController.hxx>
#include <controller/SlsPageSelector.hxx>
#include <controller/SlsFocusManager.hxx>
#include <controller/SlsSelectionManager.hxx>
#include <view/SlideSorterView.hxx>
#include <model/SlideSorterModel.hxx>
#include <model/SlsPageDescriptor.hxx>
 
#include <ViewShell.hxx>
#include <ViewShellHint.hxx>
#include <sdpage.hxx>
#include <drawdoc.hxx>
 
#include <sdresid.hxx>
#include <strings.hrc>
#include <com/sun/star/accessibility/AccessibleRole.hpp>
#include <com/sun/star/accessibility/AccessibleEventId.hpp>
#include <com/sun/star/accessibility/AccessibleStateType.hpp>
#include <com/sun/star/lang/IndexOutOfBoundsException.hpp>
#include <comphelper/accessibleeventnotifier.hxx>
#include <cppuhelper/supportsservice.hxx>
#include <o3tl/safeint.hxx>
#include <rtl/ref.hxx>
#include <sal/log.hxx>
#include <i18nlangtag/languagetag.hxx>
 
#include <vcl/settings.hxx>
#include <vcl/svapp.hxx>
 
using namespace ::com::sun::star;
using namespace ::com::sun::star::uno;
using namespace ::com::sun::star::accessibility;
 
namespace accessibility {
 
class AccessibleSlideSorterView::Implementation
    : public SfxListener
{
public:
    Implementation (
        AccessibleSlideSorterView& rAccessibleSlideSorter,
        ::sd::slidesorter::SlideSorter& rSlideSorter,
        vcl::Window* pWindow);
    virtual ~Implementation() override;
 
    void RequestUpdateChildren();
    void Clear();
    sal_Int32 GetVisibleChildCount() const;
    AccessibleSlideSorterObject* GetAccessibleChild (sal_Int32 nIndex);
    AccessibleSlideSorterObject* GetVisibleChild (sal_Int32 nIndex);
 
    void ConnectListeners();
    void ReleaseListeners();
    void Notify (SfxBroadcaster& rBroadcaster, const SfxHint& rHint) override;
    DECL_LINK(WindowEventListener, VclWindowEvent&, void);
    DECL_LINK(SelectionChangeListener, LinkParamNone*, void);
    DECL_LINK(BroadcastSelectionChange, void*, void);
    DECL_LINK(FocusChangeListener, LinkParamNone*, void);
    DECL_LINK(VisibilityChangeListener, LinkParamNone*, void);
    DECL_LINK(UpdateChildrenCallback, void*, void);
 
    void Activated();
private:
    AccessibleSlideSorterView& mrAccessibleSlideSorter;
    ::sd::slidesorter::SlideSorter& mrSlideSorter;
    typedef ::std::vector<rtl::Reference<AccessibleSlideSorterObject> > PageObjectList;
    PageObjectList maPageObjects;
    sal_Int32 mnFirstVisibleChild;
    sal_Int32 mnLastVisibleChild;
    bool mbListeningToDocument;
    VclPtr<vcl::Window> mpWindow;
    sal_Int32 mnFocusedIndex;
    bool mbModelChangeLocked;
    ImplSVEvent * mnUpdateChildrenUserEventId;
    ImplSVEvent * mnSelectionChangeUserEventId;
 
    void UpdateChildren();
};
 
//===== AccessibleSlideSorterView =============================================
 
AccessibleSlideSorterView::AccessibleSlideSorterView(
    ::sd::slidesorter::SlideSorter& rSlideSorter,
    vcl::Window* pContentWindow)
    : AccessibleSlideSorterViewBase(m_aMutex),
      mrSlideSorter(rSlideSorter),
      mnClientId(0),
      mpContentWindow(pContentWindow)
{
}
 
void AccessibleSlideSorterView::Init()
{
    mpImpl.reset(new Implementation(*this,mrSlideSorter,mpContentWindow));
}
 
AccessibleSlideSorterView::~AccessibleSlideSorterView()
{
    Destroyed ();
}
 
void AccessibleSlideSorterView::FireAccessibleEvent (
    short nEventId,
    const uno::Any& rOldValue,
    const uno::Any& rNewValue )
{
    if (mnClientId != 0)
    {
        AccessibleEventObject aEventObject;
 
        aEventObject.Source = Reference<XWeak>(this);
        aEventObject.EventId = nEventId;
        aEventObject.NewValue = rNewValue;
        aEventObject.OldValue = rOldValue;
 
        comphelper::AccessibleEventNotifier::addEvent (mnClientId, aEventObject);
    }
}
 
void SAL_CALL AccessibleSlideSorterView::disposing()
{
    if (mnClientId != 0)
    {
        comphelper::AccessibleEventNotifier::revokeClientNotifyDisposing( mnClientId, *this );
        mnClientId = 0;
    }
    mpImpl.reset();
}
 
AccessibleSlideSorterObject* AccessibleSlideSorterView::GetAccessibleChildImplementation (
    sal_Int32 nIndex)
{
    AccessibleSlideSorterObject* pResult = nullptr;
    ::osl::MutexGuard aGuard (m_aMutex);
 
    if (nIndex>=0 && nIndex<mpImpl->GetVisibleChildCount())
        pResult = mpImpl->GetVisibleChild(nIndex);
 
    return pResult;
}
 
void AccessibleSlideSorterView::Destroyed()
{
    ::osl::MutexGuard aGuard (m_aMutex);
 
    // Send a disposing to all listeners.
    if (mnClientId != 0)
    {
        comphelper::AccessibleEventNotifier::revokeClientNotifyDisposing( mnClientId, *this );
        mnClientId = 0;
    }
}
 
//=====  XAccessible  =========================================================
 
Reference<XAccessibleContext > SAL_CALL
    AccessibleSlideSorterView::getAccessibleContext()
{
    ThrowIfDisposed ();
    return this;
}
 
//=====  XAccessibleContext  ==================================================
 
sal_Int64 SAL_CALL AccessibleSlideSorterView::getAccessibleChildCount()
{
    ThrowIfDisposed();
    ::osl::MutexGuard aGuard (m_aMutex);
    return mpImpl->GetVisibleChildCount();
}
 
Reference<XAccessible > SAL_CALL
    AccessibleSlideSorterView::getAccessibleChild (sal_Int64 nIndex)
{
    ThrowIfDisposed();
    ::osl::MutexGuard aGuard (m_aMutex);
 
    if (nIndex<0 || nIndex>=mpImpl->GetVisibleChildCount())
        throw lang::IndexOutOfBoundsException();
 
    return  mpImpl->GetVisibleChild(nIndex);
}
 
Reference<XAccessible > SAL_CALL AccessibleSlideSorterView::getAccessibleParent()
{
    ThrowIfDisposed();
    const SolarMutexGuard aSolarGuard;
    Reference<XAccessible> xParent;
 
    if (mpContentWindow != nullptr)
    {
        vcl::Window* pParent = mpContentWindow->GetAccessibleParentWindow();
        if (pParent != nullptr)
            xParent = pParent->GetAccessible();
    }
 
    return xParent;
}
 
sal_Int64 SAL_CALL AccessibleSlideSorterView::getAccessibleIndexInParent()
{
    OSL_ASSERT(getAccessibleParent().is());
    ThrowIfDisposed();
    const SolarMutexGuard aSolarGuard;
    sal_Int64 nIndexInParent(-1);
 
    Reference<XAccessibleContext> xParentContext (getAccessibleParent()->getAccessibleContext());
    if (xParentContext.is())
    {
        sal_Int64 nChildCount (xParentContext->getAccessibleChildCount());
        for (sal_Int64 i=0; i<nChildCount; ++i)
            if (xParentContext->getAccessibleChild(i).get()
                    == static_cast<XAccessible*>(this))
            {
                nIndexInParent = i;
                break;
            }
    }
 
    return nIndexInParent;
}
 
sal_Int16 SAL_CALL AccessibleSlideSorterView::getAccessibleRole()
{
    ThrowIfDisposed();
    return AccessibleRole::DOCUMENT;
}
 
OUString SAL_CALL AccessibleSlideSorterView::getAccessibleDescription()
{
    ThrowIfDisposed();
    SolarMutexGuard aGuard;
 
    return SdResId(SID_SD_A11Y_I_SLIDEVIEW_D);
}
 
OUString SAL_CALL AccessibleSlideSorterView::getAccessibleName()
{
    ThrowIfDisposed();
    SolarMutexGuard aGuard;
 
    return SdResId(SID_SD_A11Y_I_SLIDEVIEW_N);
}
 
Reference<XAccessibleRelationSet> SAL_CALL
    AccessibleSlideSorterView::getAccessibleRelationSet()
{
    return Reference<XAccessibleRelationSet>();
}
 
sal_Int64 SAL_CALL AccessibleSlideSorterView::getAccessibleStateSet()
{
    ThrowIfDisposed();
    const SolarMutexGuard aSolarGuard;
    sal_Int64 nStateSet = 0;
 
    nStateSet |= AccessibleStateType::FOCUSABLE;
    nStateSet |= AccessibleStateType::SELECTABLE;
    nStateSet |= AccessibleStateType::ENABLED;
    nStateSet |= AccessibleStateType::ACTIVE;
    nStateSet |= AccessibleStateType::MULTI_SELECTABLE;
    nStateSet |= AccessibleStateType::OPAQUE;
    if (mpContentWindow!=nullptr)
    {
        if (mpContentWindow->IsVisible())
            nStateSet |= AccessibleStateType::VISIBLE;
        if (mpContentWindow->IsReallyVisible())
            nStateSet |= AccessibleStateType::SHOWING;
    }
 
    return nStateSet;
}
 
lang::Locale SAL_CALL AccessibleSlideSorterView::getLocale()
{
    ThrowIfDisposed ();
    Reference<XAccessibleContext> xParentContext;
    Reference<XAccessible> xParent (getAccessibleParent());
    if (xParent.is())
        xParentContext = xParent->getAccessibleContext();
 
    if (xParentContext.is())
        return xParentContext->getLocale();
    else
        // Strange, no parent!  Anyway, return the default locale.
        return Application::GetSettings().GetLanguageTag().getLocale();
}
 
void SAL_CALL AccessibleSlideSorterView::addAccessibleEventListener(
    const Reference<XAccessibleEventListener >& rxListener)
{
    if (!rxListener.is())
        return;
 
    const osl::MutexGuard aGuard(m_aMutex);
 
    if (rBHelper.bDisposed || rBHelper.bInDispose)
    {
        uno::Reference<uno::XInterface> x (static_cast<lang::XComponent *>(this), uno::UNO_QUERY);
        rxListener->disposing (lang::EventObject (x));
    }
    else
    {
        if ( ! mnClientId)
            mnClientId = comphelper::AccessibleEventNotifier::registerClient();
        comphelper::AccessibleEventNotifier::addEventListener(mnClientId, rxListener);
    }
}
 
void SAL_CALL AccessibleSlideSorterView::removeAccessibleEventListener(
    const Reference<XAccessibleEventListener >& rxListener)
{
    ThrowIfDisposed();
    if (!rxListener.is())
        return;
 
    const osl::MutexGuard aGuard(m_aMutex);
 
    if (mnClientId == 0)
        return;
 
    sal_Int32 nListenerCount = comphelper::AccessibleEventNotifier::removeEventListener(
        mnClientId, rxListener );
    if ( !nListenerCount )
    {
        // 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( mnClientId );
        mnClientId = 0;
    }
}
 
//===== XAccessibleComponent ==================================================
 
sal_Bool SAL_CALL AccessibleSlideSorterView::containsPoint (const awt::Point& aPoint)
{
    ThrowIfDisposed();
    const awt::Rectangle aBBox (getBounds());
    return (aPoint.X >= 0)
        && (aPoint.X < aBBox.Width)
        && (aPoint.Y >= 0)
        && (aPoint.Y < aBBox.Height);
}
 
Reference<XAccessible> SAL_CALL
    AccessibleSlideSorterView::getAccessibleAtPoint (const awt::Point& aPoint)
{
    ThrowIfDisposed();
    Reference<XAccessible> xAccessible;
    const SolarMutexGuard aSolarGuard;
 
    const Point aTestPoint (aPoint.X, aPoint.Y);
    ::sd::slidesorter::model::SharedPageDescriptor pHitDescriptor (
        mrSlideSorter.GetController().GetPageAt(aTestPoint));
    if (pHitDescriptor)
        xAccessible = mpImpl->GetAccessibleChild(
            (pHitDescriptor->GetPage()->GetPageNum()-1)/2);
 
    return xAccessible;
}
 
awt::Rectangle SAL_CALL AccessibleSlideSorterView::getBounds()
{
    ThrowIfDisposed();
    const SolarMutexGuard aSolarGuard;
    awt::Rectangle aBBox;
 
    if (mpContentWindow != nullptr)
    {
        const Point aPosition (mpContentWindow->GetPosPixel());
        const Size aSize (mpContentWindow->GetOutputSizePixel());
 
        aBBox.X = aPosition.X();
        aBBox.Y = aPosition.Y();
        aBBox.Width = aSize.Width();
        aBBox.Height = aSize.Height();
    }
 
    return aBBox;
}
 
awt::Point SAL_CALL AccessibleSlideSorterView::getLocation()
{
    ThrowIfDisposed();
    awt::Point aLocation;
 
    if (mpContentWindow != nullptr)
    {
        const Point aPosition (mpContentWindow->GetPosPixel());
        aLocation.X = aPosition.X();
        aLocation.Y = aPosition.Y();
    }
 
    return aLocation;
}
 
awt::Point SAL_CALL AccessibleSlideSorterView::getLocationOnScreen()
{
    ThrowIfDisposed();
    const SolarMutexGuard aSolarGuard;
    awt::Point aParentLocationOnScreen;
 
    Reference<XAccessible> xParent (getAccessibleParent());
    if (xParent.is())
    {
        Reference<XAccessibleComponent> xParentComponent (
            xParent->getAccessibleContext(), uno::UNO_QUERY);
        if (xParentComponent.is())
            aParentLocationOnScreen = xParentComponent->getLocationOnScreen();
    }
 
    awt::Point aLocationOnScreen (getLocation());
    aLocationOnScreen.X += aParentLocationOnScreen.X;
    aLocationOnScreen.Y += aParentLocationOnScreen.Y;
 
    return aLocationOnScreen;
}
 
awt::Size SAL_CALL AccessibleSlideSorterView::getSize()
{
    ThrowIfDisposed();
    awt::Size aSize;
 
    if (mpContentWindow != nullptr)
    {
        const Size aOutputSize (mpContentWindow->GetOutputSizePixel());
        aSize.Width = aOutputSize.Width();
        aSize.Height = aOutputSize.Height();
    }
 
    return aSize;
}
 
void SAL_CALL AccessibleSlideSorterView::grabFocus()
{
    ThrowIfDisposed();
    const SolarMutexGuard aSolarGuard;
 
    if (mpContentWindow)
        mpContentWindow->GrabFocus();
}
 
sal_Int32 SAL_CALL AccessibleSlideSorterView::getForeground()
{
    ThrowIfDisposed();
    svtools::ColorConfig aColorConfig;
    Color nColor = aColorConfig.GetColorValue( svtools::FONTCOLOR ).nColor;
    return static_cast<sal_Int32>(nColor);
}
 
sal_Int32 SAL_CALL AccessibleSlideSorterView::getBackground()
{
    ThrowIfDisposed();
    Color nColor = Application::GetSettings().GetStyleSettings().GetWindowColor();
    return sal_Int32(nColor);
}
 
//===== XAccessibleSelection ==================================================
 
void SAL_CALL AccessibleSlideSorterView::selectAccessibleChild (sal_Int64 nChildIndex)
{
    ThrowIfDisposed();
    const SolarMutexGuard aSolarGuard;
 
    if (nChildIndex < 0 || nChildIndex >= getAccessibleChildCount())
        throw lang::IndexOutOfBoundsException();
 
    AccessibleSlideSorterObject* pChild = mpImpl->GetAccessibleChild(nChildIndex);
    if (pChild == nullptr)
        throw lang::IndexOutOfBoundsException();
 
    mrSlideSorter.GetController().GetPageSelector().SelectPage(pChild->GetPageNumber());
}
 
sal_Bool SAL_CALL AccessibleSlideSorterView::isAccessibleChildSelected (sal_Int64 nChildIndex)
{
    ThrowIfDisposed();
    bool bIsSelected = false;
    const SolarMutexGuard aSolarGuard;
 
    if (nChildIndex < 0 || nChildIndex >= getAccessibleChildCount())
        throw lang::IndexOutOfBoundsException();
 
    AccessibleSlideSorterObject* pChild = mpImpl->GetAccessibleChild(nChildIndex);
    if (pChild == nullptr)
        throw lang::IndexOutOfBoundsException();
 
    bIsSelected = mrSlideSorter.GetController().GetPageSelector().IsPageSelected(
        pChild->GetPageNumber());
 
    return bIsSelected;
}
 
void SAL_CALL AccessibleSlideSorterView::clearAccessibleSelection()
{
    ThrowIfDisposed();
    const SolarMutexGuard aSolarGuard;
 
    mrSlideSorter.GetController().GetPageSelector().DeselectAllPages();
}
 
void SAL_CALL AccessibleSlideSorterView::selectAllAccessibleChildren()
{
    ThrowIfDisposed();
    const SolarMutexGuard aSolarGuard;
 
    mrSlideSorter.GetController().GetPageSelector().SelectAllPages();
}
 
sal_Int64 SAL_CALL AccessibleSlideSorterView::getSelectedAccessibleChildCount()
{
    ThrowIfDisposed ();
    const SolarMutexGuard aSolarGuard;
    return mrSlideSorter.GetController().GetPageSelector().GetSelectedPageCount();
}
 
Reference<XAccessible > SAL_CALL
    AccessibleSlideSorterView::getSelectedAccessibleChild (sal_Int64 nSelectedChildIndex )
{
    ThrowIfDisposed ();
    const SolarMutexGuard aSolarGuard;
 
    if (nSelectedChildIndex < 0 || nSelectedChildIndex >= getSelectedAccessibleChildCount())
        throw lang::IndexOutOfBoundsException();
 
    Reference<XAccessible> xChild;
 
    ::sd::slidesorter::controller::PageSelector& rSelector (
        mrSlideSorter.GetController().GetPageSelector());
    sal_Int32 nPageCount(rSelector.GetPageCount());
    sal_Int32 nSelectedCount = 0;
    for (sal_Int32 i=0; i<nPageCount; i++)
        if (rSelector.IsPageSelected(i))
        {
            if (nSelectedCount == nSelectedChildIndex)
            {
                xChild = mpImpl->GetAccessibleChild(i);
                break;
            }
            ++nSelectedCount;
        }
 
    if ( ! xChild.is() )
        throw lang::IndexOutOfBoundsException();
 
    return xChild;
}
 
void SAL_CALL AccessibleSlideSorterView::deselectAccessibleChild (sal_Int64 nChildIndex)
{
    ThrowIfDisposed();
    const SolarMutexGuard aSolarGuard;
 
    if (nChildIndex < 0 || nChildIndex >= getAccessibleChildCount())
        throw lang::IndexOutOfBoundsException();
 
    AccessibleSlideSorterObject* pChild = mpImpl->GetAccessibleChild(nChildIndex);
    if (pChild == nullptr)
        throw lang::IndexOutOfBoundsException();
 
    mrSlideSorter.GetController().GetPageSelector().DeselectPage(pChild->GetPageNumber());
}
 
// XServiceInfo
OUString SAL_CALL
       AccessibleSlideSorterView::getImplementationName()
{
    return "AccessibleSlideSorterView";
}
 
sal_Bool SAL_CALL AccessibleSlideSorterView::supportsService (const OUString& sServiceName)
{
    return cppu::supportsService(this, sServiceName);
}
 
uno::Sequence< OUString> SAL_CALL
       AccessibleSlideSorterView::getSupportedServiceNames()
{
    ThrowIfDisposed ();
 
    return uno::Sequence<OUString> {
            OUString("com.sun.star.accessibility.Accessible"),
            OUString("com.sun.star.accessibility.AccessibleContext"),
            OUString("com.sun.star.drawing.AccessibleSlideSorterView")
    };
}
 
void AccessibleSlideSorterView::ThrowIfDisposed()
{
    if (rBHelper.bDisposed || rBHelper.bInDispose)
    {
        SAL_WARN("sd", "Calling disposed object. Throwing exception:");
        throw lang::DisposedException ("object has been already disposed",
            static_cast<uno::XWeak*>(this));
    }
}
 
//===== AccessibleSlideSorterView::Implementation =============================
 
AccessibleSlideSorterView::Implementation::Implementation (
    AccessibleSlideSorterView& rAccessibleSlideSorter,
    ::sd::slidesorter::SlideSorter& rSlideSorter,
    vcl::Window* pWindow)
    : mrAccessibleSlideSorter(rAccessibleSlideSorter),
      mrSlideSorter(rSlideSorter),
      mnFirstVisibleChild(0),
      mnLastVisibleChild(-1),
      mbListeningToDocument(false),
      mpWindow(pWindow),
      mnFocusedIndex(-1),
      mbModelChangeLocked(false),
      mnUpdateChildrenUserEventId(nullptr),
      mnSelectionChangeUserEventId(nullptr)
{
    ConnectListeners();
    UpdateChildren();
}
 
AccessibleSlideSorterView::Implementation::~Implementation()
{
    if (mnUpdateChildrenUserEventId != nullptr)
        Application::RemoveUserEvent(mnUpdateChildrenUserEventId);
    if (mnSelectionChangeUserEventId != nullptr)
        Application::RemoveUserEvent(mnSelectionChangeUserEventId);
    ReleaseListeners();
    Clear();
}
 
void AccessibleSlideSorterView::Implementation::RequestUpdateChildren()
{
    if (mnUpdateChildrenUserEventId == nullptr)
        mnUpdateChildrenUserEventId = Application::PostUserEvent(
            LINK(this, AccessibleSlideSorterView::Implementation,
                 UpdateChildrenCallback));
}
 
void AccessibleSlideSorterView::Implementation::UpdateChildren()
{
      //By default, all children should be accessible. So here workaround is to make all children visible.
      // MT: This was in UpdateVisibility, which has some similarity, and hg merge automatically has put it here. Correct?!
      // In the IA2 CWS, also setting mnFirst/LastVisibleChild was commented out!
    mnLastVisibleChild = maPageObjects.size();
 
    if (mbModelChangeLocked)
    {
        // Do nothing right now.  When the flag is reset, this method is
        // called again.
        return;
    }
 
    const Range aRange (mrSlideSorter.GetView().GetVisiblePageRange());
    mnFirstVisibleChild = aRange.Min();
    mnLastVisibleChild = aRange.Max();
 
    // Release all children.
    Clear();
 
    // Create new children for the modified visible range.
    maPageObjects.resize(mrSlideSorter.GetModel().GetPageCount());
 
    // No Visible children
    if (mnFirstVisibleChild == -1 && mnLastVisibleChild == -1)
        return;
 
    for (sal_Int32 nIndex(mnFirstVisibleChild); nIndex<=mnLastVisibleChild; ++nIndex)
        GetAccessibleChild(nIndex);
}
 
void AccessibleSlideSorterView::Implementation::Clear()
{
    for (auto& rxPageObject : maPageObjects)
        if (rxPageObject != nullptr)
        {
            mrAccessibleSlideSorter.FireAccessibleEvent(
                AccessibleEventId::CHILD,
                Any(Reference<XAccessible>(rxPageObject)),
                Any());
 
            Reference<XComponent> xComponent (Reference<XWeak>(rxPageObject), UNO_QUERY);
            if (xComponent.is())
                xComponent->dispose();
            rxPageObject = nullptr;
        }
    maPageObjects.clear();
}
 
sal_Int32 AccessibleSlideSorterView::Implementation::GetVisibleChildCount() const
{
    if (mnFirstVisibleChild<=mnLastVisibleChild && mnFirstVisibleChild>=0)
        return mnLastVisibleChild - mnFirstVisibleChild + 1;
    else
        return 0;
}
 
AccessibleSlideSorterObject* AccessibleSlideSorterView::Implementation::GetVisibleChild (
    sal_Int32 nIndex)
{
    assert(nIndex>=0 && nIndex<GetVisibleChildCount());
 
    return GetAccessibleChild(nIndex+mnFirstVisibleChild);
}
 
AccessibleSlideSorterObject* AccessibleSlideSorterView::Implementation::GetAccessibleChild (
    sal_Int32 nIndex)
{
    AccessibleSlideSorterObject* pChild = nullptr;
 
    if (nIndex>=0 && o3tl::make_unsigned(nIndex)<maPageObjects.size())
    {
        if (maPageObjects[nIndex] == nullptr)
        {
            ::sd::slidesorter::model::SharedPageDescriptor pDescriptor(
                mrSlideSorter.GetModel().GetPageDescriptor(nIndex));
            if (pDescriptor)
            {
                maPageObjects[nIndex] = new AccessibleSlideSorterObject(
                    &mrAccessibleSlideSorter,
                    mrSlideSorter,
                    (pDescriptor->GetPage()->GetPageNum()-1)/2);
 
                mrAccessibleSlideSorter.FireAccessibleEvent(
                    AccessibleEventId::CHILD,
                    Any(),
                    Any(Reference<XAccessible>(maPageObjects[nIndex])));
            }
 
        }
 
        pChild = maPageObjects[nIndex].get();
    }
    else
    {
        OSL_ASSERT(nIndex>=0 && o3tl::make_unsigned(nIndex)<maPageObjects.size());
    }
 
    return pChild;
}
 
void AccessibleSlideSorterView::Implementation::ConnectListeners()
{
    StartListening (*mrSlideSorter.GetModel().GetDocument());
    if (mrSlideSorter.GetViewShell() != nullptr)
        StartListening (*mrSlideSorter.GetViewShell());
    mbListeningToDocument = true;
 
    if (mpWindow != nullptr)
        mpWindow->AddEventListener(
            LINK(this,AccessibleSlideSorterView::Implementation,WindowEventListener));
 
    mrSlideSorter.GetController().GetSelectionManager()->AddSelectionChangeListener(
        LINK(this,AccessibleSlideSorterView::Implementation,SelectionChangeListener));
    mrSlideSorter.GetController().GetFocusManager().AddFocusChangeListener(
        LINK(this,AccessibleSlideSorterView::Implementation,FocusChangeListener));
    mrSlideSorter.GetView().AddVisibilityChangeListener(
        LINK(this,AccessibleSlideSorterView::Implementation,VisibilityChangeListener));
}
 
void AccessibleSlideSorterView::Implementation::ReleaseListeners()
{
    mrSlideSorter.GetController().GetFocusManager().RemoveFocusChangeListener(
        LINK(this,AccessibleSlideSorterView::Implementation,FocusChangeListener));
    mrSlideSorter.GetController().GetSelectionManager()->RemoveSelectionChangeListener(
        LINK(this,AccessibleSlideSorterView::Implementation,SelectionChangeListener));
    mrSlideSorter.GetView().RemoveVisibilityChangeListener(
        LINK(this,AccessibleSlideSorterView::Implementation,VisibilityChangeListener));
 
    if (mpWindow != nullptr)
        mpWindow->RemoveEventListener(
            LINK(this,AccessibleSlideSorterView::Implementation,WindowEventListener));
 
    if (mbListeningToDocument)
    {
        if (mrSlideSorter.GetViewShell() != nullptr && !IsListening(*mrSlideSorter.GetViewShell()))
        {   // ??? is it even possible that ConnectListeners is called with no
            // view shell and this one with a view shell?
            StartListening(*mrSlideSorter.GetViewShell());
        }
        EndListening (*mrSlideSorter.GetModel().GetDocument());
        mbListeningToDocument = false;
    }
}
 
void AccessibleSlideSorterView::Implementation::Notify (
    SfxBroadcaster&,
    const SfxHint& rHint)
{
    if (rHint.GetId() == SfxHintId::ThisIsAnSdrHint)
    {
        const SdrHint* pSdrHint = static_cast<const SdrHint*>(&rHint);
        switch (pSdrHint->GetKind())
        {
            case SdrHintKind::PageOrderChange:
                RequestUpdateChildren();
                break;
            default:
                break;
        }
    }
    else if (auto pViewShellHint = dynamic_cast<const sd::ViewShellHint*>(&rHint))
    {
        switch (pViewShellHint->GetHintId())
        {
            case sd::ViewShellHint::HINT_COMPLEX_MODEL_CHANGE_START:
                mbModelChangeLocked = true;
                break;
 
            case sd::ViewShellHint::HINT_COMPLEX_MODEL_CHANGE_END:
                mbModelChangeLocked = false;
                RequestUpdateChildren();
                break;
            default:
                break;
        }
    }
}
 
void AccessibleSlideSorterView::SwitchViewActivated()
{
    // Firstly, set focus to view
    FireAccessibleEvent(AccessibleEventId::STATE_CHANGED,
                    Any(),
                    Any(AccessibleStateType::FOCUSED));
 
    mpImpl->Activated();
}
 
void AccessibleSlideSorterView::Implementation::Activated()
{
    mrSlideSorter.GetController().GetFocusManager().ShowFocus();
 
}
 
IMPL_LINK(AccessibleSlideSorterView::Implementation, WindowEventListener, VclWindowEvent&, rEvent, void)
{
    switch (rEvent.GetId())
    {
        case VclEventId::WindowMove:
        case VclEventId::WindowResize:
            RequestUpdateChildren();
            break;
 
        case VclEventId::WindowGetFocus:
        case VclEventId::WindowLoseFocus:
            mrAccessibleSlideSorter.FireAccessibleEvent(
                AccessibleEventId::SELECTION_CHANGED,
                Any(),
                Any());
            break;
        default:
            break;
    }
}
 
IMPL_LINK_NOARG(AccessibleSlideSorterView::Implementation, SelectionChangeListener, LinkParamNone*, void)
{
    if (mnSelectionChangeUserEventId == nullptr)
        mnSelectionChangeUserEventId = Application::PostUserEvent(
            LINK(this, AccessibleSlideSorterView::Implementation, BroadcastSelectionChange));
}
 
IMPL_LINK_NOARG(AccessibleSlideSorterView::Implementation, BroadcastSelectionChange, void*, void)
{
    mnSelectionChangeUserEventId = nullptr;
    mrAccessibleSlideSorter.FireAccessibleEvent(
        AccessibleEventId::SELECTION_CHANGED,
        Any(),
        Any());
}
 
IMPL_LINK_NOARG(AccessibleSlideSorterView::Implementation, FocusChangeListener, LinkParamNone*, void)
{
    sal_Int32 nNewFocusedIndex (
        mrSlideSorter.GetController().GetFocusManager().GetFocusedPageIndex());
 
    bool bHasFocus = mrSlideSorter.GetController().GetFocusManager().IsFocusShowing();
    if (!bHasFocus)
        nNewFocusedIndex = -1;
 
    // add a checker whether the focus event is sent out. Only after sent, the mnFocusedIndex should be updated.
    bool bSentFocus = false;
    if (nNewFocusedIndex == mnFocusedIndex)
        return;
 
    if (mnFocusedIndex >= 0)
    {
        AccessibleSlideSorterObject* pObject = GetAccessibleChild(mnFocusedIndex);
        if (pObject != nullptr)
        {
            pObject->FireAccessibleEvent(
                AccessibleEventId::STATE_CHANGED,
                Any(AccessibleStateType::FOCUSED),
                Any());
            bSentFocus = true;
        }
    }
    if (nNewFocusedIndex >= 0)
    {
        AccessibleSlideSorterObject* pObject = GetAccessibleChild(nNewFocusedIndex);
        if (pObject != nullptr)
        {
            pObject->FireAccessibleEvent(
                AccessibleEventId::STATE_CHANGED,
                Any(),
                Any(AccessibleStateType::FOCUSED));
            bSentFocus = true;
        }
    }
    if (bSentFocus)
        mnFocusedIndex = nNewFocusedIndex;
}
 
IMPL_LINK_NOARG(AccessibleSlideSorterView::Implementation, UpdateChildrenCallback, void*, void)
{
    mnUpdateChildrenUserEventId = nullptr;
    UpdateChildren();
}
 
IMPL_LINK_NOARG(AccessibleSlideSorterView::Implementation, VisibilityChangeListener, LinkParamNone*, void)
{
    UpdateChildren();
}
 
} // end of namespace ::accessibility
 
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