/****************************************************************************
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** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
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** 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
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****************************************************************************/

#ifndef QWINDOWSINPUTCONTEXT_H
#define QWINDOWSINPUTCONTEXT_H

#include "qtwindows_additional.h"

#include <QtGui/QPlatformInputContext>

QT_BEGIN_NAMESPACE

class QInputMethodEvent;

class QWindowsInputContext : public QPlatformInputContext
{
    struct CompositionContext
    {
        CompositionContext();

        HWND hwnd;
        bool haveCaret;
        QString composition;
        int position;
        bool isComposing;
    };
public:
    explicit QWindowsInputContext();
    ~QWindowsInputContext();

    virtual void reset();
    virtual void update(Qt::InputMethodQueries);

    virtual void mouseHandler(int x, QMouseEvent *event);

    static QWindowsInputContext *instance();

    bool startComposition(HWND hwnd);
    bool composition(HWND hwnd, LPARAM lParam);
    bool endComposition(HWND hwnd);

    int reconvertString(RECONVERTSTRING *reconv);

    bool handleIME_Request(WPARAM wparam, LPARAM lparam, LRESULT *result);

private:
    void initContext(HWND hwnd);
    void doneContext();
    void startContextComposition();
    void endContextComposition();

    const DWORD m_WM_MSIME_MOUSE;
    CompositionContext m_compositionContext;
    bool m_endCompositionRecursionGuard;
};

QT_END_NAMESPACE

#endif // QWINDOWSINPUTCONTEXT_H