qlayoutengine_p.h

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/****************************************************************************
** $Id: qlayoutengine_p.h,v 1.2 2003/07/10 02:40:11 llornkcor Exp $
**
** Internal header file.
**
** Created : 981027
**
** Copyright (C) 1998-99 by Trolltech AS.  All rights reserved.
**
** This file is part of the kernel 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.
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** This file may be distributed and/or modified under the terms of the
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** Foundation and appearing in the file LICENSE.GPL included in the
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#ifndef QLAYOUTENGINE_P_H
#define QLAYOUTENGINE_P_H


//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists for the convenience
// of qlayout.cpp, qlayoutengine.cpp, qmainwindow.cpp and qsplitter.cpp.
// This header file may change from version to version without notice,
// or even be removed.
//
// We mean it.
//
//


#ifndef QT_H
#include "qabstractlayout.h"
#endif // QT_H

#ifndef QT_NO_LAYOUT

struct QLayoutStruct
{
    void initParameters() {
        minimumSize = sizeHint = 0;
        maximumSize = QLAYOUTSIZE_MAX;
        expansive = FALSE;
        empty = TRUE;
    }
    void init() {
        stretch = 0;
        initParameters();
    }

    QCOORD smartSizeHint() {
        return ( stretch > 0 ) ? minimumSize : sizeHint;
    }

    // permanent storage
    int stretch;

    // parameters
    QCOORD sizeHint;
    QCOORD maximumSize;
    QCOORD minimumSize;
    bool expansive;
    bool empty;

    // temporary storage
    bool done;

    // result
    int pos;
    int size;
};


Q_EXPORT void qGeomCalc( QMemArray<QLayoutStruct> &chain, int start, int count,
                         int pos, int space, int spacer );
Q_EXPORT QSize qSmartMinSize( const QWidgetItem *i );
Q_EXPORT QSize qSmartMinSize( QWidget *w );
Q_EXPORT QSize qSmartMaxSize( const QWidgetItem *i, int align = 0 );
Q_EXPORT QSize qSmartMaxSize( QWidget *w, int align = 0 );


/*
  Modify total maximum (max) and total expansion (exp)
  when adding boxmax/boxexp.

  Expansive boxes win over non-expansive boxes.
*/
static inline void qMaxExpCalc( QCOORD & max, bool &exp,
                                QCOORD boxmax, bool boxexp )
{
    if ( exp ) {
        if ( boxexp )
            max = QMAX( max, boxmax );
    } else {
        if ( boxexp )
            max = boxmax;
        else
            max = QMIN( max, boxmax );
    }
    exp = exp || boxexp;
}

#endif //QT_NO_LAYOUT
#endif

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