/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
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** This file is part of the QtGui module of the Qt Toolkit.
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** ensure the GNU Lesser General Public License version 3 requirements
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
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****************************************************************************/


#include "qguiapplication.h"

#include <private/qobject_p.h>
#include "qkeymapper_p.h"

#include <private/qguiapplication_p.h>
#include <qpa/qplatformintegration.h>

QT_BEGIN_NAMESPACE

/*!
    \class QKeyMapper
    \since 4.2
    \internal

    \sa QObject
*/

/*!
    Constructs a new key mapper.
*/
QKeyMapper::QKeyMapper()
    : QObject(*new QKeyMapperPrivate, 0)
{
}

/*!
    Destroys the key mapper.
*/
QKeyMapper::~QKeyMapper()
{
}

QList<int> QKeyMapper::possibleKeys(QKeyEvent *e)
{
    QList<int> result;

    if (!e->nativeScanCode()) {
        if (e->key() && (e->key() != Qt::Key_unknown))
            result << int(e->key() + e->modifiers());
        else if (!e->text().isEmpty())
            result << int(e->text().at(0).unicode() + e->modifiers());
        return result;
    }

    return instance()->d_func()->possibleKeys(e);
}

extern bool qt_sendSpontaneousEvent(QObject *receiver, QEvent *event); // in qapplication_*.cpp
void QKeyMapper::changeKeyboard()
{
    instance()->d_func()->clearMappings();

    // ## TODO: Support KeyboardLayoutChange on QPA
#if 0
    // inform all toplevel widgets of the change
    QEvent e(QEvent::KeyboardLayoutChange);
    QWidgetList list = QApplication::topLevelWidgets();
    for (int i = 0; i < list.size(); ++i) {
        QWidget *w = list.at(i);
        qt_sendSpontaneousEvent(w, &e);
    }
#endif
}

Q_GLOBAL_STATIC(QKeyMapper, keymapper)
/*!
    Returns the pointer to the single instance of QKeyMapper in the application.
    If none yet exists, the function ensures that one is created.
*/
QKeyMapper *QKeyMapper::instance()
{
    return keymapper();
}

QKeyMapperPrivate *qt_keymapper_private()
{
    return QKeyMapper::instance()->d_func();
}

QKeyMapperPrivate::QKeyMapperPrivate()
{
    keyboardInputLocale = QLocale::system();
    keyboardInputDirection = keyboardInputLocale.textDirection();
}

QKeyMapperPrivate::~QKeyMapperPrivate()
{
    // clearMappings();
}

void QKeyMapperPrivate::clearMappings()
{
}

QList<int> QKeyMapperPrivate::possibleKeys(QKeyEvent *e)
{
    QList<int> result = QGuiApplicationPrivate::platformIntegration()->possibleKeys(e);
    if (!result.isEmpty())
        return result;

    if (e->key() && (e->key() != Qt::Key_unknown))
        result << int(e->key() + e->modifiers());
    else if (!e->text().isEmpty())
        result << int(e->text().at(0).unicode() + e->modifiers());
    return result;
}

QT_END_NAMESPACE