source: trunk/src/widgets/qwidgetresizehandler_p.h

/****************************************************************************
** $Id: qwidgetresizehandler_p.h 2 2005-11-16 15:49:26Z dmik $
**
** Definition of the QWidgetResizeHandler class
**
** Created : 001010
**
** Copyright (C) 1992-2002 Trolltech AS.  All rights reserved.
**
** This file is part of the workspace module of the Qt GUI Toolkit.
**
** This file may be distributed under the terms of the Q Public License
** 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.
**
** Licensees holding valid Qt Enterprise Edition licenses may use this
** file in accordance with the Qt Commercial License Agreement provided
** with the Software.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
**   information about Qt Commercial License Agreements.
** See http://www.trolltech.com/qpl/ for QPL licensing information.
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
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**********************************************************************/

#ifndef QWIDGETRESIZEHANDLER_P_H
#define QWIDGETRESIZEHANDLER_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  This header file may
// change from version to version without notice, or even be
// removed.
//
// We mean it.
//
//

#ifndef QT_H
#include "qobject.h"
#endif // QT_H
#ifndef QT_NO_RESIZEHANDLER
class QMouseEvent;
class QKeyEvent;

class Q_EXPORT QWidgetResizeHandler : public QObject
{
    Q_OBJECT

public:
    enum Action {
        Move    = 0x01,
        Resize  = 0x02,
        Any     = Move|Resize
    };

    QWidgetResizeHandler( QWidget *parent, QWidget *cw = 0, const char *name = 0 );
    void setActive( bool b ) { setActive( Any, b ); }
    void setActive( Action ac, bool b );
    bool isActive() const { return isActive( Any ); }
    bool isActive( Action ac ) const;
    void setMovingEnabled( bool b ) { moving = b; }
    bool isMovingEnabled() const { return moving; }

    bool isButtonDown() const { return buttonDown; }

    void setExtraHeight( int h ) { extrahei = h; }
    void setSizeProtection( bool b ) { sizeprotect = b; }

    void doResize();
    void doMove();

signals:
    void activate();

protected:
    bool eventFilter( QObject *o, QEvent *e );
    void mouseMoveEvent( QMouseEvent *e );
    void keyPressEvent( QKeyEvent *e );

private:
    enum MousePosition {
        Nowhere,
        TopLeft, BottomRight, BottomLeft, TopRight,
        Top, Bottom, Left, Right,
        Center
    };

    QWidget *widget;
    QWidget *childWidget;
    QPoint moveOffset;
    QPoint invertedMoveOffset;
    MousePosition mode;
    int extrahei;
    int range;
    uint buttonDown         :1;
    uint moveResizeMode     :1;
    uint activeForResize    :1;
    uint sizeprotect        :1;
    uint moving             :1; 
    uint activeForMove      :1;

    void setMouseCursor( MousePosition m );
    bool isMove() const {
        return moveResizeMode && mode == Center;
    }
    bool isResize() const {
        return moveResizeMode && !isMove();
    }

private:        // Disabled copy constructor and operator=
#if defined(Q_DISABLE_COPY)
    QWidgetResizeHandler( const QWidgetResizeHandler & );
    QWidgetResizeHandler& operator=( const QWidgetResizeHandler & );
#endif

};

#endif //QT_NO_RESIZEHANDLER
#endif