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/****************************************************************************
**
** Implementation of QInputContextFactory class
**
** Copyright (C) 2003-2004 immodule for Qt Project.  All rights reserved.
**
** This file is written to contribute to Trolltech ASA under their own
** license. You may use this file under your Qt license. Following
** description is copied from their original file headers. Contact
** immodule-qt@freedesktop.org if any conditions of this licensing are
** not clear to you.
**
****************************************************************************/

#include "qinputcontextfactory.h"

#ifndef QT_NO_IM

#include "qcoreapplication.h"
#include "qinputcontext.h"
#include "qinputcontextplugin.h"

#ifdef Q_WS_X11
#include "private/qt_x11_p.h"
#include "qximinputcontext_p.h"
#endif
#ifdef Q_WS_WIN
#include "qwininputcontext_p.h"
#endif
#ifdef Q_WS_MAC
#include "qmacinputcontext_p.h"
#endif

#include "private/qfactoryloader_p.h"
#include "qmutex.h"

#ifndef QT_NO_LIBRARY
Q_GLOBAL_STATIC_WITH_ARGS(QFactoryLoader, loader,
    (QInputContextFactoryInterface_iid, QCoreApplication::libraryPaths(), QLatin1String("/inputmethods")))
#endif

/*!
    \class QInputContextFactory
    \brief The QInputContextFactory class creates QInputContext objects.

    \ingroup appearance

    The input context factory creates a QInputContext object for a
    given key with QInputContextFactory::create().

    The input contexts are either built-in or dynamically loaded from
    an input context plugin (see QInputContextPlugin).

    keys() returns a list of valid keys. The
    keys are the names used, for example, to identify and specify
    input methods for the input method switching mechanism. The names
    have to be consistent with QInputContext::identifierName(), and
    may only contain ASCII characters.

    A key can be used to retrieve the associated input context's
    supported languages using languages(). You
    can retrieve the input context's description using
    description() and finally you can get a user
    friendly internationalized name of the QInputContext object
    specified by the key using displayName().

    \sa QInputContext, QInputContextPlugin
*/

/*!
    Creates and returns a QInputContext object for the input context
    specified by \a key with the given \a parent. Keys are case
    sensitive.

    \sa keys()
*/
QInputContext *QInputContextFactory::create( const QString& key, QObject *parent )
{
    QInputContext *result = 0;
#if defined(Q_WS_X11) && !defined(QT_NO_XIM)
    if (key == QLatin1String("xim")) {
        result = new QXIMInputContext;
    }
#endif
#if defined(Q_WS_WIN)
    if (key == QLatin1String("win")) {
        result = new QWinInputContext;
    }
#endif
#if defined(Q_WS_MAC)
    if (key == QLatin1String("mac")) {
        result = new QMacInputContext;
    }
#endif
#ifdef QT_NO_LIBRARY
    Q_UNUSED(key);
#else
    if (QInputContextFactoryInterface *factory =
        qobject_cast<QInputContextFactoryInterface*>(loader()->instance(key))) {
        result = factory->create(key);
    }
#endif
    if (result)
        result->setParent(parent);
    return result;
}


/*!
    Returns the list of keys this factory can create input contexts
    for.

    The keys are the names used, for example, to identify and specify
    input methods for the input method switching mechanism.  The names
    have to be consistent with QInputContext::identifierName(), and
    may only contain ASCII characters.

    \sa create(), displayName(), QInputContext::identifierName()
*/
QStringList QInputContextFactory::keys()
{
    QStringList result;
#if defined(Q_WS_X11) && !defined(QT_NO_XIM)
    result << QLatin1String("xim");
#endif
#if defined(Q_WS_WIN) && !defined(QT_NO_XIM)
    result << QLatin1String("win");
#endif
#if defined(Q_WS_MAC)
    result << QLatin1String("mac");
#endif
#ifndef QT_NO_LIBRARY
    result += loader()->keys();
#endif // QT_NO_LIBRARY
    return result;
}

/*!
    Returns the languages supported by the QInputContext object
    specified by \a key.

    The languages are expressed as language code (e.g. "zh_CN",
    "zh_TW", "zh_HK", "ja", "ko", ...). An input context that supports
    multiple languages can return all supported languages as a
    QStringList. The name has to be consistent with
    QInputContext::language().

    This information may be used to optimize a user interface.

    \sa keys(), QInputContext::language(), QLocale
*/
QStringList QInputContextFactory::languages( const QString &key )
{
    QStringList result;
#if defined(Q_WS_X11) && !defined(QT_NO_XIM)
    if (key == QLatin1String("xim"))
        return QStringList(QString());
#endif
#if defined(Q_WS_WIN)
    if (key == QLatin1String("win"))
        return QStringList(QString());
#endif
#if defined(Q_WS_MAC)
    if (key == QLatin1String("mac"))
        return QStringList(QString());
#endif
#ifdef QT_NO_LIBRARY
    Q_UNUSED(key);
#else
    if (QInputContextFactoryInterface *factory =
        qobject_cast<QInputContextFactoryInterface*>(loader()->instance(key)))
        result = factory->languages(key);
#endif // QT_NO_LIBRARY
    return result;
}

/*!
    Returns a user friendly internationalized name of the
    QInputContext object specified by \a key. You can, for example,
    use this name in a menu.

    \sa keys(), QInputContext::identifierName()
*/
QString QInputContextFactory::displayName( const QString &key )
{
    QString result;
#if defined(Q_WS_X11) && !defined(QT_NO_XIM)
    if (key == QLatin1String("xim"))
        return QInputContext::tr( "XIM" );
#endif
#ifdef QT_NO_LIBRARY
    Q_UNUSED(key);
#else
    if (QInputContextFactoryInterface *factory =
        qobject_cast<QInputContextFactoryInterface*>(loader()->instance(key)))
        return factory->displayName(key);
#endif // QT_NO_LIBRARY
    return QString();
}

/*!
    Returns an internationalized brief description of the QInputContext
    object specified by \a key. You can, for example, use this
    description in a user interface.

    \sa keys(), displayName()
*/
QString QInputContextFactory::description( const QString &key )
{
#if defined(Q_WS_X11) && !defined(QT_NO_XIM)
    if (key == QLatin1String("xim"))
        return QInputContext::tr( "XIM input method" );
#endif
#if defined(Q_WS_WIN) && !defined(QT_NO_XIM)
    if (key == QLatin1String("win"))
        return QInputContext::tr( "Windows input method" );
#endif
#if defined(Q_WS_MAC)
    if (key == QLatin1String("mac"))
        return QInputContext::tr( "Mac OS X input method" );
#endif
#ifdef QT_NO_LIBRARY
    Q_UNUSED(key);
#else
    if (QInputContextFactoryInterface *factory =
        qobject_cast<QInputContextFactoryInterface*>(loader()->instance(key)))
        return factory->description(key);
#endif // QT_NO_LIBRARY
    return QString();
}

#endif // QT_NO_IM