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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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 purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include "QtGui/qlayoutitem.h"
#include "QtGui/qstyle.h"
QT_BEGIN_NAMESPACE
template <typename T> class QVector;
struct QLayoutStruct
{
inline void init(int stretchFactor = 0, int minSize = 0) {
stretch = stretchFactor;
minimumSize = sizeHint = minSize;
maximumSize = QLAYOUTSIZE_MAX;
expansive = false;
empty = true;
spacing = 0;
}
int smartSizeHint() {
return (stretch > 0) ? minimumSize : sizeHint;
}
int effectiveSpacer(int uniformSpacer) const {
Q_ASSERT(uniformSpacer >= 0 || spacing >= 0);
return (uniformSpacer >= 0) ? uniformSpacer : spacing;
}
// parameters
int stretch;
int sizeHint;
int maximumSize;
int minimumSize;
bool expansive;
bool empty;
int spacing;
// temporary storage
bool done;
// result
int pos;
int size;
};
Q_GUI_EXPORT void qGeomCalc(QVector<QLayoutStruct> &chain, int start, int count,
int pos, int space, int spacer = -1);
Q_GUI_EXPORT QSize qSmartMinSize(const QSize &sizeHint, const QSize &minSizeHint,
const QSize &minSize, const QSize &maxSize,
const QSizePolicy &sizePolicy);
Q_GUI_EXPORT QSize qSmartMinSize(const QWidgetItem *i);
Q_GUI_EXPORT QSize qSmartMinSize(const QWidget *w);
Q_GUI_EXPORT QSize qSmartMaxSize(const QSize &sizeHint,
const QSize &minSize, const QSize &maxSize,
const QSizePolicy &sizePolicy, Qt::Alignment align = 0);
Q_GUI_EXPORT QSize qSmartMaxSize(const QWidgetItem *i, Qt::Alignment align = 0);
Q_GUI_EXPORT QSize qSmartMaxSize(const QWidget *w, Qt::Alignment align = 0);
Q_GUI_EXPORT int qSmartSpacing(const QLayout *layout, QStyle::PixelMetric pm);
/*
Modify total maximum (max), total expansion (exp), and total empty
when adding boxmax/boxexp.
Expansive boxes win over non-expansive boxes.
Non-empty boxes win over empty boxes.
*/
static inline void qMaxExpCalc(int & max, bool &exp, bool &empty,
int boxmax, bool boxexp, bool boxempty)
{
if (exp) {
if (boxexp)
max = qMax(max, boxmax);
} else {
if (boxexp || (empty && (!boxempty || max == 0)))
max = boxmax;
else if (empty == boxempty)
max = qMin(max, boxmax);
}
exp = exp || boxexp;
empty = empty && boxempty;
}
QT_END_NAMESPACE
#endif // QLAYOUTENGINE_P_H
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