src/gui/kernel/qlayoutengine_p.h
author Alex Gilkes <alex.gilkes@nokia.com>
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/****************************************************************************
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**
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the QtGui module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file.  Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef QLAYOUTENGINE_P_H
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#define QLAYOUTENGINE_P_H
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//
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//  W A R N I N G
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//  -------------
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//
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// This file is not part of the Qt API.  It exists purely as an
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// implementation detail.  This header file may change from version to
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// version without notice, or even be removed.
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//
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// We mean it.
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//
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#include "QtGui/qlayoutitem.h"
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#include "QtGui/qstyle.h"
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QT_BEGIN_NAMESPACE
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template <typename T> class QVector;
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struct QLayoutStruct
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{
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    inline void init(int stretchFactor = 0, int minSize = 0) {
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        stretch = stretchFactor;
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        minimumSize = sizeHint = minSize;
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        maximumSize = QLAYOUTSIZE_MAX;
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        expansive = false;
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        empty = true;
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        spacing = 0;
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    }
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    int smartSizeHint() {
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        return (stretch > 0) ? minimumSize : sizeHint;
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    }
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    int effectiveSpacer(int uniformSpacer) const {
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        Q_ASSERT(uniformSpacer >= 0 || spacing >= 0);
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        return (uniformSpacer >= 0) ? uniformSpacer : spacing;
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    }
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    // parameters
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    int stretch;
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    int sizeHint;
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    int maximumSize;
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    int minimumSize;
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    bool expansive;
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    bool empty;
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    int spacing;
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    // temporary storage
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    bool done;
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    // result
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    int pos;
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    int size;
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};
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Q_GUI_EXPORT void qGeomCalc(QVector<QLayoutStruct> &chain, int start, int count,
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                            int pos, int space, int spacer = -1);
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Q_GUI_EXPORT QSize qSmartMinSize(const QSize &sizeHint, const QSize &minSizeHint,
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                                 const QSize &minSize, const QSize &maxSize,
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                                 const QSizePolicy &sizePolicy);
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Q_GUI_EXPORT QSize qSmartMinSize(const QWidgetItem *i);
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Q_GUI_EXPORT QSize qSmartMinSize(const QWidget *w);
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Q_GUI_EXPORT QSize qSmartMaxSize(const QSize &sizeHint,
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                                 const QSize &minSize, const QSize &maxSize,
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                                 const QSizePolicy &sizePolicy, Qt::Alignment align = 0);
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Q_GUI_EXPORT QSize qSmartMaxSize(const QWidgetItem *i, Qt::Alignment align = 0);
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Q_GUI_EXPORT QSize qSmartMaxSize(const QWidget *w, Qt::Alignment align = 0);
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Q_GUI_EXPORT int qSmartSpacing(const QLayout *layout, QStyle::PixelMetric pm);
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/*
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  Modify total maximum (max), total expansion (exp), and total empty
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  when adding boxmax/boxexp.
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  Expansive boxes win over non-expansive boxes.
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  Non-empty boxes win over empty boxes.
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*/
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static inline void qMaxExpCalc(int & max, bool &exp, bool &empty,
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                               int boxmax, bool boxexp, bool boxempty)
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{
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    if (exp) {
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        if (boxexp)
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            max = qMax(max, boxmax);
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    } else {
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        if (boxexp || (empty && (!boxempty || max == 0)))
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            max = boxmax;
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        else if (empty == boxempty)
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            max = qMin(max, boxmax);
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    }
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    exp = exp || boxexp;
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    empty = empty && boxempty;
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}
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QT_END_NAMESPACE
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#endif // QLAYOUTENGINE_P_H