accessibility.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 <vcl/layout.hxx>
#include <vcl/toolkit/fixed.hxx>
#include <vcl/window.hxx>
#include <vcl/menu.hxx>
#include <vcl/mnemonic.hxx>
#include <vcl/wrkwin.hxx>
 
#include <window.h>
#include <brdwin.hxx>
 
#include <com/sun/star/accessibility/XAccessible.hpp>
#include <com/sun/star/accessibility/AccessibleRole.hpp>
#include <com/sun/star/accessibility/AccessibleStateType.hpp>
#include <com/sun/star/accessibility/XAccessibleEditableText.hpp>
#include <com/sun/star/awt/XVclWindowPeer.hpp>
 
#include <sal/log.hxx>
 
using namespace ::com::sun::star::uno;
using namespace ::com::sun::star::lang;
using namespace ::com::sun::star::datatransfer::clipboard;
using namespace ::com::sun::star::datatransfer::dnd;
using namespace ::com::sun::star;
 
 
ImplAccessibleInfos::ImplAccessibleInfos()
{
    nAccessibleRole = 0xFFFF;
    pLabeledByWindow = nullptr;
    pLabelForWindow = nullptr;
}
 
ImplAccessibleInfos::~ImplAccessibleInfos()
{
}
 
namespace vcl {
 
css::uno::Reference< css::accessibility::XAccessible > Window::GetAccessible( bool bCreate )
{
    // do not optimize hierarchy for the top level border win (ie, when there is no parent)
    /* // do not optimize accessible hierarchy at all to better reflect real VCL hierarchy
    if ( GetParent() && ( GetType() == WindowType::BORDERWINDOW ) && ( GetChildCount() == 1 ) )
    //if( !ImplIsAccessibleCandidate() )
    {
        vcl::Window* pChild = GetAccessibleChildWindow( 0 );
        if ( pChild )
            return pChild->GetAccessible();
    }
    */
    if ( !mpWindowImpl )
        return css::uno::Reference< css::accessibility::XAccessible >();
    if ( !mpWindowImpl->mxAccessible.is() && bCreate )
        mpWindowImpl->mxAccessible = CreateAccessible();
 
    return mpWindowImpl->mxAccessible;
}
 
css::uno::Reference< css::accessibility::XAccessible > Window::CreateAccessible()
{
    css::uno::Reference< css::accessibility::XAccessible > xAcc( GetComponentInterface(), css::uno::UNO_QUERY );
    return xAcc;
}
 
void Window::SetAccessible( const css::uno::Reference< css::accessibility::XAccessible >& x )
{
    if (!mpWindowImpl)
        return;
 
    mpWindowImpl->mxAccessible = x;
}
 
// skip all border windows that are not top level frames
bool Window::ImplIsAccessibleCandidate() const
{
    if( !mpWindowImpl->mbBorderWin )
        return true;
    else
        // #101741 do not check for WB_CLOSEABLE because undecorated floaters (like menus!) are closeable
        if( mpWindowImpl->mbFrame && mpWindowImpl->mnStyle & (WB_MOVEABLE | WB_SIZEABLE) )
            return true;
        else
            return false;
}
 
bool Window::ImplIsAccessibleNativeFrame() const
{
    if( mpWindowImpl->mbFrame )
        // #101741 do not check for WB_CLOSEABLE because undecorated floaters (like menus!) are closeable
        if( mpWindowImpl->mnStyle & (WB_MOVEABLE | WB_SIZEABLE) )
            return true;
        else
            return false;
    else
        return false;
}
 
vcl::Window* Window::GetAccessibleParentWindow() const
{
    if (!mpWindowImpl || ImplIsAccessibleNativeFrame())
        return nullptr;
 
    vcl::Window* pParent = mpWindowImpl->mpParent;
    if( GetType() == WindowType::MENUBARWINDOW )
    {
        // report the menubar as a child of THE workwindow
        vcl::Window *pWorkWin = GetParent()->mpWindowImpl->mpFirstChild;
        while( pWorkWin && (pWorkWin == this) )
            pWorkWin = pWorkWin->mpWindowImpl->mpNext;
        pParent = pWorkWin;
    }
    // If this is a floating window which has a native border window, then that border should be reported as
    // the accessible parent
    else if( GetType() == WindowType::FLOATINGWINDOW &&
        mpWindowImpl->mpBorderWindow && mpWindowImpl->mpBorderWindow->mpWindowImpl->mbFrame )
    {
        pParent = mpWindowImpl->mpBorderWindow;
    }
    else if( pParent && !pParent->ImplIsAccessibleCandidate() )
    {
        pParent = pParent->mpWindowImpl->mpParent;
    }
    return pParent;
}
 
sal_uInt16 Window::GetAccessibleChildWindowCount()
{
    if (!mpWindowImpl)
        return 0;
 
    sal_uInt16 nChildren = 0;
    vcl::Window* pChild = mpWindowImpl->mpFirstChild;
    while( pChild )
    {
        if( pChild->IsVisible() )
            nChildren++;
        pChild = pChild->mpWindowImpl->mpNext;
    }
 
    // report the menubarwindow as a child of THE workwindow
    if( GetType() == WindowType::BORDERWINDOW )
    {
        ImplBorderWindow *pBorderWindow = static_cast<ImplBorderWindow*>(this);
        if( pBorderWindow->mpMenuBarWindow &&
            pBorderWindow->mpMenuBarWindow->IsVisible()
            )
            --nChildren;
    }
    else if( GetType() == WindowType::WORKWINDOW )
    {
        WorkWindow *pWorkWindow = static_cast<WorkWindow*>(this);
        if( pWorkWindow->GetMenuBar() &&
            pWorkWindow->GetMenuBar()->GetWindow() &&
            pWorkWindow->GetMenuBar()->GetWindow()->IsVisible()
            )
            ++nChildren;
    }
 
    return nChildren;
}
 
vcl::Window* Window::GetAccessibleChildWindow( sal_uInt16 n )
{
    // report the menubarwindow as the first child of THE workwindow
    if( GetType() == WindowType::WORKWINDOW && static_cast<WorkWindow *>(this)->GetMenuBar() )
    {
        if( n == 0 )
        {
            MenuBar *pMenuBar = static_cast<WorkWindow *>(this)->GetMenuBar();
            if( pMenuBar->GetWindow() && pMenuBar->GetWindow()->IsVisible() )
                return pMenuBar->GetWindow();
        }
        else
            --n;
    }
 
    // transform n to child number including invisible children
    sal_uInt16 nChildren = n;
    vcl::Window* pChild = mpWindowImpl->mpFirstChild;
    while( pChild )
    {
        if( pChild->IsVisible() )
        {
            if( ! nChildren )
                break;
            nChildren--;
        }
        pChild = pChild->mpWindowImpl->mpNext;
    }
 
    if( GetType() == WindowType::BORDERWINDOW && pChild && pChild->GetType() == WindowType::MENUBARWINDOW )
    {
        do pChild = pChild->mpWindowImpl->mpNext; while( pChild && ! pChild->IsVisible() );
        SAL_WARN_IF( !pChild, "vcl", "GetAccessibleChildWindow(): wrong index in border window");
    }
 
    if ( pChild && ( pChild->GetType() == WindowType::BORDERWINDOW ) && ( pChild->GetChildCount() == 1 ) )
    {
        pChild = pChild->GetChild( 0 );
    }
    return pChild;
}
 
void Window::SetAccessibleRole( sal_uInt16 nRole )
{
    if ( !mpWindowImpl->mpAccessibleInfos )
        mpWindowImpl->mpAccessibleInfos.reset( new ImplAccessibleInfos );
 
    SAL_WARN_IF( mpWindowImpl->mpAccessibleInfos->nAccessibleRole != 0xFFFF, "vcl", "AccessibleRole already set!" );
    mpWindowImpl->mpAccessibleInfos->nAccessibleRole = nRole;
}
 
sal_uInt16 Window::getDefaultAccessibleRole() const
{
    sal_uInt16 nRole = 0xFFFF;
    switch ( GetType() )
    {
        case WindowType::MESSBOX:    // MT: Would be nice to have special roles!
        case WindowType::INFOBOX:
        case WindowType::WARNINGBOX:
        case WindowType::ERRORBOX:
        case WindowType::QUERYBOX: nRole = accessibility::AccessibleRole::ALERT; break;
 
        case WindowType::MODELESSDIALOG:
        case WindowType::TABDIALOG:
        case WindowType::BUTTONDIALOG:
        case WindowType::DIALOG: nRole = accessibility::AccessibleRole::DIALOG; break;
 
        case WindowType::PUSHBUTTON:
        case WindowType::OKBUTTON:
        case WindowType::CANCELBUTTON:
        case WindowType::HELPBUTTON:
        case WindowType::IMAGEBUTTON:
        case WindowType::MOREBUTTON: nRole = accessibility::AccessibleRole::PUSH_BUTTON; break;
        case WindowType::MENUBUTTON: nRole = accessibility::AccessibleRole::BUTTON_MENU; break;
 
        case WindowType::RADIOBUTTON: nRole = accessibility::AccessibleRole::RADIO_BUTTON; break;
        case WindowType::TRISTATEBOX:
        case WindowType::CHECKBOX: nRole = accessibility::AccessibleRole::CHECK_BOX; break;
 
        case WindowType::MULTILINEEDIT: nRole = accessibility::AccessibleRole::SCROLL_PANE; break;
 
        case WindowType::PATTERNFIELD:
        case WindowType::EDIT: nRole = static_cast<Edit const *>(this)->IsPassword() ? accessibility::AccessibleRole::PASSWORD_TEXT : accessibility::AccessibleRole::TEXT; break;
 
        case WindowType::PATTERNBOX:
        case WindowType::NUMERICBOX:
        case WindowType::METRICBOX:
        case WindowType::CURRENCYBOX:
        case WindowType::LONGCURRENCYBOX:
        case WindowType::COMBOBOX: nRole = accessibility::AccessibleRole::COMBO_BOX; break;
 
        case WindowType::LISTBOX:
        case WindowType::MULTILISTBOX: nRole = accessibility::AccessibleRole::LIST; break;
 
        case WindowType::TREELISTBOX: nRole = accessibility::AccessibleRole::TREE; break;
 
        case WindowType::FIXEDTEXT: nRole = accessibility::AccessibleRole::LABEL; break;
        case WindowType::FIXEDLINE:
            if( !GetText().isEmpty() )
                nRole = accessibility::AccessibleRole::LABEL;
            else
                nRole = accessibility::AccessibleRole::SEPARATOR;
            break;
 
        case WindowType::FIXEDBITMAP:
        case WindowType::FIXEDIMAGE: nRole = accessibility::AccessibleRole::ICON; break;
        case WindowType::GROUPBOX: nRole = accessibility::AccessibleRole::GROUP_BOX; break;
        case WindowType::SCROLLBAR: nRole = accessibility::AccessibleRole::SCROLL_BAR; break;
 
        case WindowType::SLIDER:
        case WindowType::SPLITTER:
        case WindowType::SPLITWINDOW: nRole = accessibility::AccessibleRole::SPLIT_PANE; break;
 
        case WindowType::DATEBOX:
        case WindowType::TIMEBOX:
        case WindowType::DATEFIELD:
        case WindowType::TIMEFIELD: nRole = accessibility::AccessibleRole::DATE_EDITOR; break;
 
        case WindowType::METRICFIELD:
        case WindowType::CURRENCYFIELD:
        case WindowType::SPINBUTTON:
        case WindowType::SPINFIELD:
        case WindowType::FORMATTEDFIELD: nRole = accessibility::AccessibleRole::SPIN_BOX; break;
 
        case WindowType::TOOLBOX: nRole = accessibility::AccessibleRole::TOOL_BAR; break;
        case WindowType::STATUSBAR: nRole = accessibility::AccessibleRole::STATUS_BAR; break;
 
        case WindowType::TABPAGE: nRole = accessibility::AccessibleRole::PANEL; break;
        case WindowType::TABCONTROL: nRole = accessibility::AccessibleRole::PAGE_TAB_LIST; break;
 
        case WindowType::DOCKINGWINDOW: nRole = (mpWindowImpl->mbFrame) ? accessibility::AccessibleRole::FRAME :
                                                                      accessibility::AccessibleRole::PANEL; break;
 
        case WindowType::FLOATINGWINDOW: nRole = ( mpWindowImpl->mbFrame ||
                                             (mpWindowImpl->mpBorderWindow && mpWindowImpl->mpBorderWindow->mpWindowImpl->mbFrame) ||
                                             (GetStyle() & WB_OWNERDRAWDECORATION) ) ? accessibility::AccessibleRole::FRAME :
                                                                                       accessibility::AccessibleRole::WINDOW; break;
 
        case WindowType::WORKWINDOW: nRole = accessibility::AccessibleRole::ROOT_PANE; break;
 
        case WindowType::SCROLLBARBOX: nRole = accessibility::AccessibleRole::FILLER; break;
 
        case WindowType::HELPTEXTWINDOW: nRole = accessibility::AccessibleRole::TOOL_TIP; break;
 
        case WindowType::RULER: nRole = accessibility::AccessibleRole::RULER; break;
 
        case WindowType::SCROLLWINDOW: nRole = accessibility::AccessibleRole::SCROLL_PANE; break;
 
        case WindowType::WINDOW:
        case WindowType::CONTROL:
        case WindowType::BORDERWINDOW:
        case WindowType::SYSTEMCHILDWINDOW:
        default:
            if (ImplIsAccessibleNativeFrame() )
                nRole = accessibility::AccessibleRole::FRAME;
            else if( IsScrollable() )
                nRole = accessibility::AccessibleRole::SCROLL_PANE;
            else if( this->ImplGetWindow()->IsMenuFloatingWindow() )
                nRole = accessibility::AccessibleRole::WINDOW;      // #106002#, contextmenus are windows (i.e. toplevel)
            else
                // #104051# WINDOW seems to be a bad default role, use LAYEREDPANE instead
                // a WINDOW is interpreted as a top-level window, which is typically not the case
                //nRole = accessibility::AccessibleRole::WINDOW;
                nRole = accessibility::AccessibleRole::PANEL;
    }
    return nRole;
}
 
sal_uInt16 Window::GetAccessibleRole() const
{
    if (!mpWindowImpl)
        return 0;
 
    sal_uInt16 nRole = mpWindowImpl->mpAccessibleInfos ? mpWindowImpl->mpAccessibleInfos->nAccessibleRole : 0xFFFF;
    if ( nRole == 0xFFFF )
        nRole = getDefaultAccessibleRole();
    return nRole;
}
 
void Window::SetAccessibleName( const OUString& rName )
{
    if ( !mpWindowImpl->mpAccessibleInfos )
        mpWindowImpl->mpAccessibleInfos.reset( new ImplAccessibleInfos );
 
    OUString oldName = GetAccessibleName();
 
    mpWindowImpl->mpAccessibleInfos->pAccessibleName = rName;
 
    CallEventListeners( VclEventId::WindowFrameTitleChanged, &oldName );
}
 
OUString Window::GetAccessibleName() const
{
    if (!mpWindowImpl)
        return OUString();
 
    if (mpWindowImpl->mpAccessibleInfos && mpWindowImpl->mpAccessibleInfos->pAccessibleName)
        return *mpWindowImpl->mpAccessibleInfos->pAccessibleName;
    return getDefaultAccessibleName();
}
 
OUString Window::getDefaultAccessibleName() const
{
    OUString aAccessibleName;
    switch ( GetType() )
    {
        case WindowType::MULTILINEEDIT:
        case WindowType::PATTERNFIELD:
        case WindowType::METRICFIELD:
        case WindowType::CURRENCYFIELD:
        case WindowType::EDIT:
 
        case WindowType::DATEBOX:
        case WindowType::TIMEBOX:
        case WindowType::CURRENCYBOX:
        case WindowType::LONGCURRENCYBOX:
        case WindowType::DATEFIELD:
        case WindowType::TIMEFIELD:
        case WindowType::SPINFIELD:
        case WindowType::FORMATTEDFIELD:
 
        case WindowType::COMBOBOX:
        case WindowType::LISTBOX:
        case WindowType::MULTILISTBOX:
        case WindowType::TREELISTBOX:
        case WindowType::METRICBOX:
        {
            vcl::Window *pLabel = GetAccessibleRelationLabeledBy();
            if ( pLabel && pLabel != this )
                aAccessibleName = pLabel->GetText();
            if (aAccessibleName.isEmpty())
                aAccessibleName = GetQuickHelpText();
            if (aAccessibleName.isEmpty())
                aAccessibleName = GetText();
        }
        break;
 
        case WindowType::IMAGEBUTTON:
        case WindowType::PUSHBUTTON:
            aAccessibleName = GetText();
            if (aAccessibleName.isEmpty())
            {
                aAccessibleName = GetQuickHelpText();
                if (aAccessibleName.isEmpty())
                    aAccessibleName = GetHelpText();
            }
        break;
 
        case WindowType::TOOLBOX:
            aAccessibleName = GetText();
            break;
 
        case WindowType::MOREBUTTON:
            aAccessibleName = mpWindowImpl->maText;
            break;
 
        default:
            aAccessibleName = GetText();
            break;
    }
 
    return removeMnemonicFromString( aAccessibleName );
}
 
void Window::SetAccessibleDescription( const OUString& rDescription )
{
    if ( ! mpWindowImpl->mpAccessibleInfos )
        mpWindowImpl->mpAccessibleInfos.reset( new ImplAccessibleInfos );
 
    std::optional<OUString>& rCurrentDescription = mpWindowImpl->mpAccessibleInfos->pAccessibleDescription;
    SAL_WARN_IF( rCurrentDescription && *rCurrentDescription != rDescription, "vcl", "AccessibleDescription already set" );
    rCurrentDescription = rDescription;
}
 
OUString Window::GetAccessibleDescription() const
{
    if (!mpWindowImpl)
        return OUString();
 
    OUString aAccessibleDescription;
    if ( mpWindowImpl->mpAccessibleInfos && mpWindowImpl->mpAccessibleInfos->pAccessibleDescription )
    {
        aAccessibleDescription = *mpWindowImpl->mpAccessibleInfos->pAccessibleDescription;
    }
    else
    {
        // Special code for help text windows. ZT asks the border window for the
        // description so we have to forward this request to our inner window.
        const vcl::Window* pWin = this->ImplGetWindow();
        if ( pWin->GetType() == WindowType::HELPTEXTWINDOW )
            aAccessibleDescription = pWin->GetHelpText();
        else
            aAccessibleDescription = GetHelpText();
    }
 
    return aAccessibleDescription;
}
 
void Window::SetAccessibleRelationLabeledBy( vcl::Window* pLabeledBy )
{
    if ( !mpWindowImpl->mpAccessibleInfos )
        mpWindowImpl->mpAccessibleInfos.reset( new ImplAccessibleInfos );
    mpWindowImpl->mpAccessibleInfos->pLabeledByWindow = pLabeledBy;
}
 
void Window::SetAccessibleRelationLabelFor( vcl::Window* pLabelFor )
{
    if ( !mpWindowImpl->mpAccessibleInfos )
        mpWindowImpl->mpAccessibleInfos.reset( new ImplAccessibleInfos );
    mpWindowImpl->mpAccessibleInfos->pLabelForWindow = pLabelFor;
}
 
vcl::Window* Window::GetAccessibleRelationMemberOf() const
{
    if (!isContainerWindow(this) && !isContainerWindow(GetParent()))
        return getLegacyNonLayoutAccessibleRelationMemberOf();
 
    return nullptr;
}
 
vcl::Window* Window::getAccessibleRelationLabelFor() const
{
    if (mpWindowImpl->mpAccessibleInfos && mpWindowImpl->mpAccessibleInfos->pLabelForWindow)
        return mpWindowImpl->mpAccessibleInfos->pLabelForWindow;
 
    return nullptr;
}
 
vcl::Window* Window::GetAccessibleRelationLabelFor() const
{
    vcl::Window* pWindow = getAccessibleRelationLabelFor();
 
    if (pWindow)
        return pWindow;
 
    if (!isContainerWindow(this) && !isContainerWindow(GetParent()))
        return getLegacyNonLayoutAccessibleRelationLabelFor();
 
    return nullptr;
}
 
vcl::Window* Window::GetAccessibleRelationLabeledBy() const
{
    if (mpWindowImpl->mpAccessibleInfos && mpWindowImpl->mpAccessibleInfos->pLabeledByWindow)
        return mpWindowImpl->mpAccessibleInfos->pLabeledByWindow;
 
    std::vector<VclPtr<FixedText> > aMnemonicLabels(list_mnemonic_labels());
    if (!aMnemonicLabels.empty())
    {
        //if we have multiple labels, then prefer the first that is visible
        for (auto const & rCandidate : aMnemonicLabels)
        {
            if (rCandidate->IsVisible())
                return rCandidate;
        }
        return aMnemonicLabels[0];
    }
 
    if (!isContainerWindow(this) && !isContainerWindow(GetParent()))
        return getLegacyNonLayoutAccessibleRelationLabeledBy();
 
    return nullptr;
}
 
bool Window::IsAccessibilityEventsSuppressed( bool bTraverseParentPath )
{
    if( !bTraverseParentPath )
        return mpWindowImpl->mbSuppressAccessibilityEvents;
    else
    {
        vcl::Window *pParent = this;
        while ( pParent && pParent->mpWindowImpl)
        {
            if( pParent->mpWindowImpl->mbSuppressAccessibilityEvents )
                return true;
            else
                pParent = pParent->mpWindowImpl->mpParent; // do not use GetParent() to find borderwindows that are frames
        }
        return false;
    }
}
 
void Window::SetAccessibilityEventsSuppressed(bool bSuppressed)
{
    mpWindowImpl->mbSuppressAccessibilityEvents = bSuppressed;
}
 
} /* namespace vcl */
 
uno::Reference<accessibility::XAccessibleEditableText>
FindFocusedEditableText(uno::Reference<accessibility::XAccessibleContext> const& xContext)
{
    if (!xContext.is())
        return uno::Reference<accessibility::XAccessibleEditableText>();
 
    sal_Int64 nState = xContext->getAccessibleStateSet();
    if (nState & accessibility::AccessibleStateType::FOCUSED)
    {
        uno::Reference<accessibility::XAccessibleEditableText> xText(xContext, uno::UNO_QUERY);
        if (xText.is())
            return xText;
        if (nState & accessibility::AccessibleStateType::MANAGES_DESCENDANTS)
            return uno::Reference<accessibility::XAccessibleEditableText>();
    }
 
    bool bSafeToIterate = true;
    sal_Int64 nCount = xContext->getAccessibleChildCount();
    if (nCount < 0 || nCount > SAL_MAX_UINT16 /* slow enough for anyone */)
        bSafeToIterate = false;
    if (!bSafeToIterate)
        return uno::Reference<accessibility::XAccessibleEditableText>();
 
    for (sal_Int64 i = 0; i < xContext->getAccessibleChildCount(); ++i)
    {
        uno::Reference<accessibility::XAccessible> xChild = xContext->getAccessibleChild(i);
        if (!xChild.is())
            continue;
        uno::Reference<accessibility::XAccessibleContext> xChildContext
            = xChild->getAccessibleContext();
        if (!xChildContext.is())
            continue;
        uno::Reference<accessibility::XAccessibleEditableText> xText
            = FindFocusedEditableText(xChildContext);
        if (xText.is())
            return xText;
    }
    return uno::Reference<accessibility::XAccessibleEditableText>();
}
 
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