/****************************************************************************
** $Id$
**
** Definition of QSimpleInputContext class
**
** Copyright (C) 2004 immodule for Qt Project.  All rights reserved.
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**
** This file is part of the input method module of the Qt GUI Toolkit.
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** as defined by Trolltech AS of Norway and appearing in the file
** LICENSE.QPL included in the packaging of this file.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
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** licenses may use this file in accordance with the Qt Commercial License
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**********************************************************************/

#ifndef QSIMPLEINPUT_CONTEXT_H
#define QSIMPLEINPUT_CONTEXT_H

#include <qinputcontext.h>
#include <qnamespace.h>

#define QT_KEYSEQUENCE_MAX_LEN 6
#define UNITIZE(qkey) (0x02000000|qkey)

struct QComposeTableElement {
    uint keys[QT_KEYSEQUENCE_MAX_LEN];
    uint value;
};

struct QComposeTable {
    const QComposeTableElement *data;
    uint size;
};


class QSimpleInputContext : public QInputContext {
    Q_OBJECT
public:
    QSimpleInputContext();
    ~QSimpleInputContext();

    virtual QString identifierName();
    virtual QString language();

    virtual bool filterEvent( const QEvent *event );
    virtual void reset();
    virtual void setFocus();
    virtual void unsetFocus();
    virtual void setMicroFocus( int x, int y, int w, int h, QFont *f = 0 );
    virtual void mouseHandler( int x, QEvent::Type type,
			       Qt::ButtonState button, Qt::ButtonState state );

protected:
    bool isIgnoreKeys(int keyval );
    bool isComposingKeys( int keyval );
    bool checkComposeTable( uint composeBuffer[], const QComposeTable *composeTable );
    void commitChar( uint c );

    void clearComposeBuffer(void);

protected:
    uint composeBuffer[QT_KEYSEQUENCE_MAX_LEN + 1];
    static const QComposeTable defaultComposeTable;
};

#endif // QSIMPLEINPUT_CONTEXT_H