path: root/src/plugins/platforms/windows/accessible/qwindowsaccessibility.cpp

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**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
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** This file is part of the plugins of the Qt Toolkit.
**
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** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
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****************************************************************************/

#include <QtCore/QtConfig>
#ifndef QT_NO_ACCESSIBILITY


#include <private/qsystemlibrary_p.h>

#include <QtCore/qlocale.h>
#include <QtCore/qmap.h>
#include <QtCore/qpair.h>
#include <QtCore/qsettings.h>
#include <QtGui/qaccessible.h>
#include <QtGui/qaccessible2.h>
#include <QtGui/qplatformnativeinterface_qpa.h>
#include <QtGui/qwindow.h>
#include <QtGui/qguiapplication.h>

#include "qwindowsaccessibility.h"
#ifdef Q_CC_MINGW
# include "qwindowsmsaaaccessible.h"
#else
# include "iaccessible2.h"
#endif
#include "comutils.h"

#include <oleacc.h>

//#include <uiautomationcoreapi.h>
#ifndef UiaRootObjectId
#define UiaRootObjectId        -25
#endif

#include <winuser.h>
#if !defined(WINABLEAPI)
#  if defined(Q_OS_WINCE)
#    include <bldver.h>
#  endif
#  include <winable.h>
#endif

#include <oleacc.h>
#include <servprov.h>
#if !defined(Q_CC_BOR) && !defined (Q_CC_GNU)
#include <comdef.h>
#endif

#ifdef Q_OS_WINCE
#include "../qguifunctions_wince.h"
#endif

#include "../qtwindows_additional.h"


// This stuff is used for widgets/items with no window handle:
typedef QMap<int, QPair<QObject*,int> > NotifyMap;
Q_GLOBAL_STATIC(NotifyMap, qAccessibleRecentSentEvents)


QT_BEGIN_NAMESPACE


/*!
    \!internal
    \class QWindowsAccessibility

    Implements QPlatformAccessibility

*/
QWindowsAccessibility::QWindowsAccessibility()
{
}

void QWindowsAccessibility::notifyAccessibilityUpdate(QAccessibleEvent *event)
{
    QString soundName;
    switch (event->type()) {
    case QAccessible::PopupMenuStart:
        soundName = QLatin1String("MenuPopup");
        break;

    case QAccessible::MenuCommand:
        soundName = QLatin1String("MenuCommand");
        break;

    case QAccessible::Alert:
        {
        /*      ### FIXME
#ifndef QT_NO_MESSAGEBOX
            QMessageBox *mb = qobject_cast<QMessageBox*>(o);
            if (mb) {
                switch (mb->icon()) {
                case QMessageBox::Warning:
                    soundName = QLatin1String("SystemExclamation");
                    break;
                case QMessageBox::Critical:
                    soundName = QLatin1String("SystemHand");
                    break;
                case QMessageBox::Information:
                    soundName = QLatin1String("SystemAsterisk");
                    break;
                default:
                    break;
                }
            } else
#endif // QT_NO_MESSAGEBOX
*/
            {
                soundName = QLatin1String("SystemAsterisk");
            }

        }
        break;
    default:
        break;
    }

    if (!soundName.isEmpty()) {
#ifndef QT_NO_SETTINGS
        QSettings settings(QLatin1String("HKEY_CURRENT_USER\\AppEvents\\Schemes\\Apps\\.Default\\") + soundName,
                           QSettings::NativeFormat);
        QString file = settings.value(QLatin1String(".Current/.")).toString();
#else
        QString file;
#endif
        if (!file.isEmpty()) {
            PlaySound(reinterpret_cast<const wchar_t *>(soundName.utf16()), 0, SND_ALIAS | SND_ASYNC | SND_NODEFAULT | SND_NOWAIT);
        }
    }

    typedef void (WINAPI *PtrNotifyWinEvent)(DWORD, HWND, LONG, LONG);

#if defined(Q_OS_WINCE) // ### TODO: check for NotifyWinEvent in CE 6.0
    // There is no user32.lib nor NotifyWinEvent for CE
    return;
#else
    static PtrNotifyWinEvent ptrNotifyWinEvent = 0;
    static bool resolvedNWE = false;
    if (!resolvedNWE) {
        resolvedNWE = true;
        ptrNotifyWinEvent = (PtrNotifyWinEvent)QSystemLibrary::resolve(QLatin1String("user32"), "NotifyWinEvent");
    }
    if (!ptrNotifyWinEvent)
        return;

    // An event has to be associated with a window,
    // so find the first parent that is a widget and that has a WId
    QAccessibleInterface *iface = event->accessibleInterface();
    QWindow *window = iface ? QWindowsAccessibility::windowHelper(iface) : 0;
    delete iface;

    if (!window) {
        window = QGuiApplication::activeWindow();
        if (!window)
            return;
    }

    QPlatformNativeInterface *platform = QGuiApplication::platformNativeInterface();
    HWND hWnd = (HWND)platform->nativeResourceForWindow("handle", window);

    static int eventNum = 0;
    if (event->type() != QAccessible::MenuCommand) { // MenuCommand is faked
        // See comment "SENDING EVENTS TO OBJECTS WITH NO WINDOW HANDLE"
        eventNum %= 50;              //[0..49]
        int eventId = - (eventNum - 1);

        qAccessibleRecentSentEvents()->insert(eventId, qMakePair(event->object(), event->child()));
        ptrNotifyWinEvent(event->type(), hWnd, OBJID_CLIENT, eventId );

        ++eventNum;
    }
#endif // Q_OS_WINCE
}

QWindow *QWindowsAccessibility::windowHelper(const QAccessibleInterface *iface)
{
    QWindow *window = iface->window();
    if (!window) {
        QAccessibleInterface *acc = iface->parent();
        while (acc && !window) {
            window = acc->window();
            QAccessibleInterface *par = acc->parent();
            delete acc;
            acc = par;
        }
    }
    return window;
}

/*!
  \internal
  helper to wrap a QAccessibleInterface inside a IAccessible*
*/
IAccessible *QWindowsAccessibility::wrap(QAccessibleInterface *acc)
{
    if (!acc)
        return 0;
#ifdef Q_CC_MINGW
    QWindowsMsaaAccessible *wacc = new QWindowsMsaaAccessible(acc);
#else
    QWindowsIA2Accessible *wacc = new QWindowsIA2Accessible(acc);
#endif
    IAccessible *iacc = 0;
    wacc->QueryInterface(IID_IAccessible, (void**)&iacc);
    return iacc;
}

/*!
  \internal
*/
QPair<QObject*, int> QWindowsAccessibility::getCachedObject(int entryId)
{
    return qAccessibleRecentSentEvents()->value(entryId);
}

/*
void QWindowsAccessibility::setRootObject(QObject *o)
{

}

void QWindowsAccessibility::initialize()
{

}

void QWindowsAccessibility::cleanup()
{

}

*/

bool QWindowsAccessibility::handleAccessibleObjectFromWindowRequest(HWND hwnd, WPARAM wParam, LPARAM lParam, LRESULT *lResult)
{
    if (static_cast<long>(lParam) == static_cast<long>(UiaRootObjectId)) {
        /* For UI Automation */
    } else if ((DWORD)lParam == OBJID_CLIENT) {
#if 1
        // Ignoring all requests while starting up
        // ### Maybe QPA takes care of this???
        if (QCoreApplication::startingUp() || QCoreApplication::closingDown())
            return false;
#endif

        typedef LRESULT (WINAPI *PtrLresultFromObject)(REFIID, WPARAM, LPUNKNOWN);
        static PtrLresultFromObject ptrLresultFromObject = 0;
        static bool oleaccChecked = false;

        if (!oleaccChecked) {
            oleaccChecked = true;
#if !defined(Q_OS_WINCE)
            ptrLresultFromObject = (PtrLresultFromObject)QSystemLibrary::resolve(QLatin1String("oleacc"), "LresultFromObject");
#endif
        }

        if (ptrLresultFromObject) {
            QWindow *window = QWindowsContext::instance()->findWindow(hwnd);
            if (window) {
                QAccessibleInterface *acc = window->accessibleRoot();
                if (acc) {
                    if (IAccessible *iface = wrap(acc)) {
                        *lResult = ptrLresultFromObject(IID_IAccessible, wParam, iface);  // ref == 2
                        if (*lResult) {
                            iface->Release(); // the client will release the object again, and then it will destroy itself
                        }
                        return true;
                    } else {
                        delete acc;
                    }
                }
            }
        }
    }
    return false;
}

QT_END_NAMESPACE

#endif //QT_NO_ACCESSIBILITY