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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** 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 QLAYOUTITEM_H
#define QLAYOUTITEM_H
#include <QtGui/qsizepolicy.h>
#include <QtCore/qrect.h>
#include <limits.h>
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
QT_MODULE(Gui)
static const int QLAYOUTSIZE_MAX = INT_MAX/256/16;
class QLayout;
class QLayoutItem;
class QSpacerItem;
class QWidget;
class QSize;
class Q_GUI_EXPORT QLayoutItem
{
public:
inline explicit QLayoutItem(Qt::Alignment alignment = 0);
virtual ~QLayoutItem();
virtual QSize sizeHint() const = 0;
virtual QSize minimumSize() const = 0;
virtual QSize maximumSize() const = 0;
virtual Qt::Orientations expandingDirections() const = 0;
virtual void setGeometry(const QRect&) = 0;
virtual QRect geometry() const = 0;
virtual bool isEmpty() const = 0;
virtual bool hasHeightForWidth() const;
virtual int heightForWidth(int) const;
virtual int minimumHeightForWidth(int) const;
virtual void invalidate();
virtual QWidget *widget();
virtual QLayout *layout();
virtual QSpacerItem *spacerItem();
Qt::Alignment alignment() const { return align; }
void setAlignment(Qt::Alignment a);
QSizePolicy::ControlTypes controlTypes() const;
protected:
Qt::Alignment align;
};
inline QLayoutItem::QLayoutItem(Qt::Alignment aalignment)
: align(aalignment) { }
class Q_GUI_EXPORT QSpacerItem : public QLayoutItem
{
public:
QSpacerItem(int w, int h,
QSizePolicy::Policy hData = QSizePolicy::Minimum,
QSizePolicy::Policy vData = QSizePolicy::Minimum)
: width(w), height(h), sizeP(hData, vData) { }
void changeSize(int w, int h,
QSizePolicy::Policy hData = QSizePolicy::Minimum,
QSizePolicy::Policy vData = QSizePolicy::Minimum);
QSize sizeHint() const;
QSize minimumSize() const;
QSize maximumSize() const;
Qt::Orientations expandingDirections() const;
bool isEmpty() const;
void setGeometry(const QRect&);
QRect geometry() const;
QSpacerItem *spacerItem();
private:
int width;
int height;
QSizePolicy sizeP;
QRect rect;
};
class Q_GUI_EXPORT QWidgetItem : public QLayoutItem
{
Q_DISABLE_COPY(QWidgetItem)
public:
explicit QWidgetItem(QWidget *w) : wid(w) { }
QSize sizeHint() const;
QSize minimumSize() const;
QSize maximumSize() const;
Qt::Orientations expandingDirections() const;
bool isEmpty() const;
void setGeometry(const QRect&);
QRect geometry() const;
virtual QWidget *widget();
bool hasHeightForWidth() const;
int heightForWidth(int) const;
protected:
QWidget *wid;
};
class Q_GUI_EXPORT QWidgetItemV2 : public QWidgetItem
{
public:
explicit QWidgetItemV2(QWidget *widget);
~QWidgetItemV2();
QSize sizeHint() const;
QSize minimumSize() const;
QSize maximumSize() const;
int heightForWidth(int width) const;
private:
enum { Dirty = -123, HfwCacheMaxSize = 3 };
inline bool useSizeCache() const;
void updateCacheIfNecessary() const;
inline void invalidateSizeCache() {
q_cachedMinimumSize.setWidth(Dirty);
q_hfwCacheSize = 0;
}
mutable QSize q_cachedMinimumSize;
mutable QSize q_cachedSizeHint;
mutable QSize q_cachedMaximumSize;
mutable QSize q_cachedHfws[HfwCacheMaxSize];
mutable short q_firstCachedHfw;
mutable short q_hfwCacheSize;
void *d;
friend class QWidgetPrivate;
Q_DISABLE_COPY(QWidgetItemV2)
};
QT_END_NAMESPACE
QT_END_HEADER
#endif // QLAYOUTITEM_H
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