/* -*- 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 <scitems.hxx>

#include <tools/gen.hxx>

#include <AccessibleText.hxx>

#include <editsrc.hxx>

#include <AccessiblePreviewCell.hxx>

#include <prevwsh.hxx>

#include <prevloc.hxx>

#include <document.hxx>

#include <svx/AccessibleTextHelper.hxx>

#include <editeng/brushitem.hxx>

#include <vcl/window.hxx>

#include <vcl/svapp.hxx>

#include <vcl/unohelp.hxx>

#include <com/sun/star/accessibility/AccessibleStateType.hpp>

#include <comphelper/sequence.hxx>

using namespace ::com::sun::star;

using namespace ::com::sun::star::accessibility;

ScAccessiblePreviewCell::ScAccessiblePreviewCell(

    const rtl::Reference<ScAccessiblePreviewTable>& rParent, ScPreviewShell* pViewShell,

    const ScAddress& rCellAddress, sal_Int32 nIndex)

    : ScAccessibleCellBase(rParent, (pViewShell ? &pViewShell->GetDocument() : nullptr),

                           rCellAddress, nIndex)

    , mpViewShell(pViewShell)

{

    if (mpViewShell)

        mpViewShell->AddAccessibilityObject(*this);

}

ScAccessiblePreviewCell::~ScAccessiblePreviewCell()

{

    if (!ScAccessibleContextBase::IsDefunc() && !rBHelper.bInDispose)

    {

        // increment refcount to prevent double call of dtor

        osl_atomic_increment( &m_refCount );

        // call dispose to inform object which have a weak reference to this object

        dispose();

    }

}

void SAL_CALL ScAccessiblePreviewCell::disposing()

{

    SolarMutexGuard aGuard;

    if (mpViewShell)

    {

        mpViewShell->RemoveAccessibilityObject(*this);

        mpViewShell = nullptr;

    }

    mpTextHelper.reset();

    ScAccessibleCellBase::disposing();

}

void ScAccessiblePreviewCell::Notify( SfxBroadcaster& rBC, const SfxHint& rHint )

{

    if (rHint.GetId() == SfxHintId::ScAccVisAreaChanged)

    {

        if (mpTextHelper)

            mpTextHelper->UpdateChildren();

    }

    ScAccessibleContextBase::Notify(rBC, rHint);

}

//=====  XAccessibleComponent  ============================================

uno::Reference< XAccessible > SAL_CALL ScAccessiblePreviewCell::getAccessibleAtPoint( const awt::Point& rPoint )

{

    rtl::Reference<comphelper::OAccessible> pRet;

    if (containsPoint(rPoint))

    {

        SolarMutexGuard aGuard;

        ensureAlive();

        if(!mpTextHelper)

            CreateTextHelper();

        pRet = mpTextHelper->GetAt(rPoint);

    }

    return pRet;

}

void SAL_CALL ScAccessiblePreviewCell::grabFocus()

{

    SolarMutexGuard aGuard;

    ensureAlive();

    if (getAccessibleParent().is())

    {

        uno::Reference<XAccessibleComponent> xAccessibleComponent(getAccessibleParent()->getAccessibleContext(), uno::UNO_QUERY);

        if (xAccessibleComponent.is())

            xAccessibleComponent->grabFocus();

    }

}

//=====  XAccessibleContext  ==============================================

sal_Int64 SAL_CALL ScAccessiblePreviewCell::getAccessibleChildCount()

{

    SolarMutexGuard aGuard;

    ensureAlive();

    if (!mpTextHelper)

        CreateTextHelper();

    return mpTextHelper->GetChildCount();

}

uno::Reference< XAccessible > SAL_CALL ScAccessiblePreviewCell::getAccessibleChild(sal_Int64 nIndex)

{

    SolarMutexGuard aGuard;

    ensureAlive();

    if (!mpTextHelper)

        CreateTextHelper();

    return mpTextHelper->GetChild(nIndex);

}

sal_Int64 SAL_CALL ScAccessiblePreviewCell::getAccessibleStateSet()

{

    SolarMutexGuard aGuard;

    sal_Int64 nParentStates = 0;

    if (getAccessibleParent().is())

    {

        uno::Reference<XAccessibleContext> xParentContext = getAccessibleParent()->getAccessibleContext();

        nParentStates = xParentContext->getAccessibleStateSet();

    }

    sal_Int64 nStateSet = 0;

    if (IsDefunc(nParentStates))

        nStateSet |= AccessibleStateType::DEFUNC;

    else

    {

        nStateSet |= AccessibleStateType::ENABLED;

        nStateSet |= AccessibleStateType::MULTI_LINE;

        if (IsOpaque())

            nStateSet |= AccessibleStateType::OPAQUE;

        if (isShowing())

            nStateSet |= AccessibleStateType::SHOWING;

        nStateSet |= AccessibleStateType::TRANSIENT;

        if (isVisible())

            nStateSet |= AccessibleStateType::VISIBLE;

        // MANAGES_DESCENDANTS (for paragraphs)

        nStateSet |= AccessibleStateType::MANAGES_DESCENDANTS;

    }

    return nStateSet;

}

AbsoluteScreenPixelRectangle ScAccessiblePreviewCell::GetBoundingBoxOnScreen()

{

    tools::Rectangle aCellRect;

    if (mpViewShell)

    {

        aCellRect = mpViewShell->GetLocationData().GetCellPosition(maCellAddress);

        vcl::Window* pWindow = mpViewShell->GetWindow();

        if (pWindow)

        {

            AbsoluteScreenPixelRectangle aRect = pWindow->GetWindowExtentsAbsolute();

            aCellRect.Move(aRect.Left(), aRect.Top());

        }

    }

    return AbsoluteScreenPixelRectangle(aCellRect);

}

tools::Rectangle ScAccessiblePreviewCell::GetBoundingBox()

{

    tools::Rectangle aCellRect;

    if (mpViewShell)

    {

        aCellRect = mpViewShell->GetLocationData().GetCellPosition(maCellAddress);

        uno::Reference<XAccessible> xAccParent = getAccessibleParent();

        if (xAccParent.is())

        {

            uno::Reference<XAccessibleContext> xAccParentContext = xAccParent->getAccessibleContext();

            uno::Reference<XAccessibleComponent> xAccParentComp (xAccParentContext, uno::UNO_QUERY);

            if (xAccParentComp.is())

            {

                tools::Rectangle aParentRect(

                    vcl::unohelper::ConvertToVCLRect(xAccParentComp->getBounds()));

                aCellRect.Move(-aParentRect.Left(), -aParentRect.Top());

            }

        }

    }

    return aCellRect;

}

bool ScAccessiblePreviewCell::IsDefunc(sal_Int64 nParentStates)

{

    return ScAccessibleContextBase::IsDefunc() || (mpDoc == nullptr) || (mpViewShell == nullptr) || !getAccessibleParent().is() ||

         (nParentStates & AccessibleStateType::DEFUNC);

}

bool ScAccessiblePreviewCell::IsEditable(sal_Int64 /* nParentStates */)

{

    return false;

}

bool ScAccessiblePreviewCell::IsOpaque() const

{

    // test whether there is a background color

    //! could be moved to ScAccessibleCellBase

    bool bOpaque(true);

    if (mpDoc)

    {

        const SvxBrushItem& rItem = mpDoc->GetAttr(maCellAddress, ATTR_BACKGROUND);

        bOpaque = rItem.GetColor() != COL_TRANSPARENT;

    }

    return bOpaque;

}

void ScAccessiblePreviewCell::CreateTextHelper()

{

    if (mpTextHelper)

        return;

    mpTextHelper.reset( new ::accessibility::AccessibleTextHelper(

        std::make_unique<ScAccessibilityEditSource>(

            std::make_unique<ScAccessiblePreviewCellTextData>(

                mpViewShell, maCellAddress))) );

    mpTextHelper->SetEventSource( this );

    // paragraphs in preview are transient

    mpTextHelper->SetAdditionalChildStates( AccessibleStateType::TRANSIENT );

}

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