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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** 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 Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qaccessibleobject.h"

#ifndef QT_NO_ACCESSIBILITY

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

QT_BEGIN_NAMESPACE

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.
*/
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.
*/
QAccessibleObject::~QAccessibleObject()
{
    delete d;
}

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

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

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

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

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

/*! \reimp */
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 */
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.
*/
QAccessibleApplication::QAccessibleApplication()
: QAccessibleObject(qApp)
{
}

// all toplevel widgets except popups and the desktop
static QWidgetList topLevelWidgets()
{
    QWidgetList list;
    const QWidgetList tlw(QApplication::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 */
int QAccessibleApplication::childCount() const
{
    return topLevelWidgets().count();
}

/*! \reimp */
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 */
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 */
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 */
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 = QApplication::activeWindow();
        break;
    default:
        break;
    }
    *target = QAccessible::queryAccessibleInterface(targetObject);
    return *target ? 0 : -1;
}

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

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

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

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

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

/*! \reimp */
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; }

QT_END_NAMESPACE

#endif //QT_NO_ACCESSIBILITY