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qaccessibleobject.cpp

/****************************************************************************
**
** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 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 GNU
** General Public Licensing requirements will be met:
** http://www.trolltech.com/products/qt/opensource.html
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
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** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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****************************************************************************/

#include "qaccessibleobject.h"

#ifndef QT_NO_ACCESSIBILITY

#include "qapplication.h"
#include "qwidget.h"
#include "qpointer.h"
#include "qmetaobject.h"
#include "qvarlengtharray.h"

class QAccessibleObjectPrivate
{
public:
    QPointer<QObject> object;

    QList<QByteArray> actionList() const;
};

QList<QByteArray> QAccessibleObjectPrivate::actionList() const
{
    QList<QByteArray> actionList;

    if (!object)
        return actionList;

    const QMetaObject *mo = object->metaObject();
    Q_ASSERT(mo);

    QByteArray defaultAction = QMetaObject::normalizedSignature(
        mo->classInfo(mo->indexOfClassInfo("DefaultSlot")).value());

    for (int i = 0; i < mo->methodCount(); ++i) {
        const QMetaMethod member = mo->method(i);
        if (member.methodType() != QMetaMethod::Slot && member.access() != QMetaMethod::Public)
            continue;

        if (!qstrcmp(member.tag(), "QACCESSIBLE_SLOT")) {
            if (member.signature() == defaultAction)
                actionList.prepend(defaultAction);
            else
                actionList << member.signature();
        }
    }

    return actionList;
}

/*!
    \class QAccessibleObject
    \brief The QAccessibleObject class implements parts of the
    QAccessibleInterface for QObjects.

    \ingroup accessibility

    This class is mainly provided for convenience. All subclasses of
    the QAccessibleInterface that provide implementations of non-widget objects
    should use this class as their base class.

    \sa QAccessible, QAccessibleWidget
*/

/*!
    Creates a QAccessibleObject for \a object.
*/
00088 QAccessibleObject::QAccessibleObject(QObject *object)
{
    d = new QAccessibleObjectPrivate;
    d->object = object;
}

/*!
    Destroys the QAccessibleObject.

    This only happens when a call to release() decrements the internal
    reference counter to zero.
*/
00100 QAccessibleObject::~QAccessibleObject()
{
    delete d;
}

/*!
    \reimp
*/
00108 QObject *QAccessibleObject::object() const
{
#ifndef QT_NO_DEBUG
    if (!isValid())
        qWarning("QAccessibleInterface is invalid. Crash pending...");
#endif
    return d->object;
}

/*!
    \reimp
*/
00120 bool QAccessibleObject::isValid() const
{
    return !d->object.isNull();
}

/*! \reimp */
00126 QRect QAccessibleObject::rect(int) const
{
    return QRect();
}

/*! \reimp */
00132 void QAccessibleObject::setText(Text, int, const QString &)
{
}

/*! \reimp */
00137 int QAccessibleObject::userActionCount(int) const
{
    return 0;
}

/*! \reimp */
00143 bool QAccessibleObject::doAction(int, int, const QVariantList &)
{
    return false;
}

static const char * const action_text[][5] =
{
    // Name, Description, Value, Help, Accelerator
    { "Press", "", "", "", "Space" },
    { "SetFocus", "Passes focus to this widget", "", "", "" },
    { "Increase", "", "", "", "" },
    { "Decrease", "", "", "", "" },
    { "Accept", "", "", "", "" },
    { "Cancel", "", "", "", "" },
    { "Select", "", "", "", "" },
    { "ClearSelection", "", "", "", "" },
    { "RemoveSelection", "", "", "", "" },
    { "ExtendSelection", "", "", "", "" },
    { "AddToSelection", "", "", "", "" }
};

/*! \reimp */
00165 QString QAccessibleObject::actionText(int action, Text t, int child) const
{
    if (child || action > FirstStandardAction || action < LastStandardAction || t > Accelerator)
        return QString();

    return QString::fromLatin1(action_text[-(action - FirstStandardAction)][t]);
}


/*!
    \class QAccessibleApplication
    \brief The QAccessibleApplication class implements the QAccessibleInterface for QApplication.

    \internal

    \ingroup accessibility
*/

/*!
    Creates a QAccessibleApplication for the QApplication object referenced by qApp.
*/
00186 QAccessibleApplication::QAccessibleApplication()
: QAccessibleObject(qApp)
{
}

// all toplevel widgets except popups and the desktop
static QWidgetList topLevelWidgets()
{
    QWidgetList list;
    const QWidgetList tlw(qApp->topLevelWidgets());
    for (int i = 0; i < tlw.count(); ++i) {
        QWidget *w = tlw.at(i);
        if (!(w->windowType() == Qt::Popup) && !(w->windowType() == Qt::Desktop))
            list.append(w);
    }

    return list;
}

/*! \reimp */
00206 int QAccessibleApplication::childCount() const
{
    return topLevelWidgets().count();
}

/*! \reimp */
00212 int QAccessibleApplication::indexOfChild(const QAccessibleInterface *child) const
{
    if (!child->object()->isWidgetType())
        return -1;

    const QWidgetList tlw(topLevelWidgets());
    int index = tlw.indexOf(static_cast<QWidget*>(child->object()));
    if (index != -1)
        ++index;
    return index;
}

/*! \reimp */
00225 int QAccessibleApplication::childAt(int x, int y) const
{
    const QWidgetList tlw(topLevelWidgets());
    for (int i = 0; i < tlw.count(); ++i) {
        QWidget *w = tlw.at(i);
        if (w->frameGeometry().contains(x,y))
            return i+1;
    }
    return -1;
}

/*! \reimp */
00237 QAccessible::Relation QAccessibleApplication::relationTo(int child, const
        QAccessibleInterface *other, int otherChild) const
{
    QObject *o = other ? other->object() : 0;
    if (!o)
        return Unrelated;

    if(o == object()) {
        if (child && !otherChild)
            return Child;
        if (!child && otherChild)
            return Ancestor;
        if (!child && !otherChild)
            return Self;
    }

    QWidgetList tlw(topLevelWidgets());
    if (tlw.contains(qobject_cast<QWidget*>(o)))
        return Ancestor;

    for (int i = 0; i < tlw.count(); ++i) {
        QWidget *w = tlw.at(i);
        QObjectList cl = qFindChildren<QObject *>(w, QString());
        if (cl.contains(o))
            return Ancestor;
    }

    return Unrelated;
}

/*! \reimp */
00268 int QAccessibleApplication::navigate(RelationFlag relation, int entry,
                                     QAccessibleInterface **target) const
{
    if (!target)
        return -1;

    *target = 0;
    QObject *targetObject = 0;

    switch (relation) {
    case Self:
        targetObject = object();
        break;
    case Child:
        if (entry > 0 && entry <= childCount()) {
            const QWidgetList tlw(topLevelWidgets());
            if (tlw.count() >= entry)
                targetObject = tlw.at(entry-1);
        } else {
            return -1;
        }
        break;
    case FocusChild:
        targetObject = qApp->activeWindow();
        break;
    default:
        break;
    }
    *target = QAccessible::queryAccessibleInterface(targetObject);
    return *target ? 0 : -1;
}

/*! \reimp */
00301 QString QAccessibleApplication::text(Text t, int) const
{
    switch (t) {
    case Name:
        if (qApp->activeWindow())
            return qApp->activeWindow()->windowTitle();
        break;
    case Description:
        return qApp->applicationFilePath();
    default:
        break;
    }
    return QString();
}

/*! \reimp */
00317 QAccessible::Role QAccessibleApplication::role(int) const
{
    return Application;
}

/*! \reimp */
00323 QAccessible::State QAccessibleApplication::state(int) const
{
    return qApp->activeWindow() ? Focused : Normal;
}

/*! \reimp */
00329 int QAccessibleApplication::userActionCount(int) const
{
    return 1;
}

/*! \reimp */
00335 bool QAccessibleApplication::doAction(int action, int child, const QVariantList &param)
{
    if (action == 0 || action == 1) {
        QWidget *w = 0;
        w = qApp->activeWindow();
        if (!w)
            w = topLevelWidgets().at(0);
        if (!w)
            return false;
        w->activateWindow();
        return true;
    }
    return QAccessibleObject::doAction(action, child, param);
}

/*! \reimp */
00351 QString QAccessibleApplication::actionText(int action, Text text, int child) const
{
    QString str;
    if ((action == 0 || action == 1) && !child) switch (text) {
    case Name:
        return QApplication::tr("Activate");
    case Description:
        return QApplication::tr("Activates the program's main window");
    default:
        break;
    }
    return QAccessibleObject::actionText(action, text, child);
}

// ### Qt 5: remove me - binary compatibility hack
QAccessibleObjectEx::QAccessibleObjectEx(QObject *object)
{
    d = new QAccessibleObjectPrivate;
    d->object = object;
}
bool QAccessibleObjectEx::isValid() const
{ return reinterpret_cast<const QAccessibleObject *>(this)->QAccessibleObject::isValid(); }
QObject *QAccessibleObjectEx::object() const
{ return reinterpret_cast<const QAccessibleObject *>(this)->QAccessibleObject::object(); }
QRect QAccessibleObjectEx::rect(int child) const
{ return reinterpret_cast<const QAccessibleObject *>(this)->QAccessibleObject::rect(child); }
void QAccessibleObjectEx::setText(Text t, int child, const QString &text)
{ reinterpret_cast<QAccessibleObject *>(this)->QAccessibleObject::setText(t, child, text); }
int QAccessibleObjectEx::userActionCount(int child) const
{ return reinterpret_cast<const QAccessibleObject *>(this)->QAccessibleObject::userActionCount(child); }
bool QAccessibleObjectEx::doAction(int action, int child, const QVariantList &params)
{ return reinterpret_cast<QAccessibleObject *>(this)->QAccessibleObject::doAction(action, child, params); }
QString QAccessibleObjectEx::actionText(int action, Text t, int child) const
{ return reinterpret_cast<const QAccessibleObject *>(this)->QAccessibleObject::actionText(action, t, child); }
QAccessibleObjectEx::~QAccessibleObjectEx()
{ delete d; }

#endif //QT_NO_ACCESSIBILITY

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