AccDescendantManagerEventListener.cxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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#include <com/sun/star/accessibility/XAccessible.hpp>
#include <com/sun/star/accessibility/AccessibleStateType.hpp>
#include <com/sun/star/accessibility/AccessibleEventId.hpp>
#include <com/sun/star/accessibility/AccessibleRole.hpp>
#include <com/sun/star/accessibility/XAccessibleEventBroadcaster.hpp>
 
#include <vcl/svapp.hxx>
 
#include <AccDescendantManagerEventListener.hxx>
#include <AccObjectManagerAgent.hxx>
#include <unomsaaevent.hxx>
 
using namespace com::sun::star::uno;
using namespace com::sun::star::accessibility;
 
AccDescendantManagerEventListener::AccDescendantManagerEventListener(css::accessibility::XAccessible* pAcc, AccObjectManagerAgent* Agent)
    :   AccComponentEventListener(pAcc, Agent)
{
}
 
AccDescendantManagerEventListener::~AccDescendantManagerEventListener()
{
}
 
void  AccDescendantManagerEventListener::notifyEvent( const css::accessibility::AccessibleEventObject& aEvent )
{
    SolarMutexGuard g;
 
    switch (aEvent.EventId)
    {
    case AccessibleEventId::SELECTION_CHANGED:
        HandleSelectionChangedEvent(aEvent.OldValue, aEvent.NewValue);
        break;
    case AccessibleEventId::CHILD:
        HandleChildChangedEvent(aEvent.OldValue, aEvent.NewValue);
        break;
    case AccessibleEventId::ACTIVE_DESCENDANT_CHANGED_NOFOCUS:
        HandleChildChangedNoFocusEvent(aEvent.OldValue, aEvent.NewValue);
        break;
    case AccessibleEventId::SELECTION_CHANGED_ADD:
        HandleSelectionChangedAddEvent(aEvent.OldValue, aEvent.NewValue);
        break;
    case AccessibleEventId::SELECTION_CHANGED_REMOVE:
        HandleSelectionChangedRemoveEvent(aEvent.OldValue, aEvent.NewValue);
        break;
    case AccessibleEventId::SELECTION_CHANGED_WITHIN:
        HandleSelectionChangedWithinEvent(aEvent.OldValue, aEvent.NewValue);
        break;
    default:
        AccComponentEventListener::notifyEvent(aEvent);
        break;
    }
}
 
void AccDescendantManagerEventListener::HandleChildChangedEvent(Any oldValue, Any newValue)
{
 
    Reference< XAccessible > xChild;
    if( newValue >>= xChild)
    {
        //create a new child
        if(xChild.is())
        {
            XAccessible* pAcc = xChild.get();
            pAgent->InsertAccObj(pAcc, m_xAccessible.get());
            pAgent->InsertChildrenAccObj(pAcc);
 
            pAgent->NotifyAccEvent(UnoMSAAEvent::CHILD_ADDED, pAcc);
 
        }
    }
 
    if (oldValue >>= xChild)
    {
        if(xChild.is())
        {
            XAccessible* pAcc = xChild.get();
 
            pAgent->NotifyAccEvent(UnoMSAAEvent::CHILD_REMOVED, pAcc);
            pAgent->DeleteChildrenAccObj( pAcc );
            pAgent->DeleteAccObj( pAcc );
        }
    }
 
}
 
void AccDescendantManagerEventListener::HandleSelectionChangedEvent(Any oldValue, Any newValue)
{
    bool bSend =false;
    Reference< XAccessible > xChild;
    if(newValue >>= xChild )
    {
        if(xChild.is())
        {
            XAccessible* pAcc = xChild.get();
            //if the Role is the SC cell ,don't add the selected state.
            if (pAgent->GetRole(pAcc) != AccessibleRole::TABLE_CELL)
            {
                pAgent->IncreaseState( pAcc, AccessibleStateType::SELECTED);
            }
 
            pAgent->NotifyAccEvent(UnoMSAAEvent::SELECTION_CHANGED, pAcc);
            bSend=true;
        }
    }
    if(oldValue >>= xChild )
    {
        if(xChild.is())
        {
            XAccessible* pAcc = xChild.get();
            pAgent->DecreaseState( pAcc, AccessibleStateType::SELECTED);
        }
    }
    if (!bSend)
    {
        pAgent->NotifyAccEvent(UnoMSAAEvent::SELECTION_CHANGED, m_xAccessible.get());
    }
}
 
 
void AccDescendantManagerEventListener::HandleChildChangedNoFocusEvent(Any oldValue, Any newValue)
{
    Reference< XAccessible > xChild;
    if(newValue >>= xChild )
    {
        if(xChild.is())
        {
            XAccessible* pAcc = xChild.get();
 
            pAgent->InsertAccObj(pAcc, m_xAccessible.get());
            pAgent->InsertChildrenAccObj(pAcc);
        }
    }
    if (oldValue >>= xChild)
    {
        if(xChild.is())
        {
            XAccessible* pAcc = xChild.get();
            pAgent->DeleteChildrenAccObj( pAcc );
            pAgent->DeleteAccObj( pAcc );
        }
    }
}
 
bool AccDescendantManagerEventListener::NotifyChildEvent(UnoMSAAEvent eWinEvent, const Any& Value)
{
    Reference< XAccessible > xChild;
    if(Value >>= xChild )
    {
        if(xChild.is())
        {
            XAccessible* pAcc = xChild.get();
            pAgent->NotifyAccEvent(eWinEvent, pAcc);
 
            if (pAgent->IsStateManageDescendant(m_xAccessible.get()))
            {
                if (eWinEvent == UnoMSAAEvent::SELECTION_CHANGED_REMOVE)
                {
                    // The object has just been sent in a SELECTION_CHANGED_REMOVE event
                    // and accessibility tools may query for the object and call methods on
                    // it as a response to this.
                    // Therefore, don't delete the object yet, but remember it for deletion
                    // once the next event of a different type occurs.
                    m_aUnselectedChildrenForDeletion.push_back(pAcc);
                }
                else
                {
                    // handle any pending deletions for objects previously removed from selection
                    for (XAccessible* pAcc2 : m_aUnselectedChildrenForDeletion)
                        pAgent->DeleteAccObj(pAcc2);
                    m_aUnselectedChildrenForDeletion.clear();
                }
            }
            return true;
        }
    }
    return false;
}
void AccDescendantManagerEventListener::HandleSelectionChangedAddEvent(const Any& /*oldValue*/, const Any &newValue)
{
    if (NotifyChildEvent(UnoMSAAEvent::SELECTION_CHANGED_ADD, newValue))
    {
        return ;
    }
    pAgent->NotifyAccEvent(UnoMSAAEvent::SELECTION_CHANGED_ADD, m_xAccessible.get());
}
 
void AccDescendantManagerEventListener::HandleSelectionChangedRemoveEvent(const Any& /*oldValue*/, const Any &newValue)
{
    if (NotifyChildEvent(UnoMSAAEvent::SELECTION_CHANGED_REMOVE, newValue))
    {
        return ;
    }
    pAgent->NotifyAccEvent(UnoMSAAEvent::SELECTION_CHANGED_REMOVE, m_xAccessible.get());
}
 
void AccDescendantManagerEventListener::HandleSelectionChangedWithinEvent(const Any& /*oldValue*/, const Any &newValue)
{
    if (NotifyChildEvent(UnoMSAAEvent::SELECTION_CHANGED_WITHIN, newValue))
    {
        return ;
    }
    pAgent->NotifyAccEvent(UnoMSAAEvent::SELECTION_CHANGED_WITHIN, m_xAccessible.get());
}
 
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