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# qlayoutitem.h

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    00001 /****************************************************************************
    00002 **
    00003 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
    00004 ** All rights reserved.
    00005 ** Contact: Nokia Corporation (qt-info@nokia.com)
    00006 **
    00007 ** This file is part of the QtGui module of the Qt Toolkit.
    00008 **
    00009 ** $QT_BEGIN_LICENSE:LGPL$
    00010 ** Commercial Usage
    00011 ** Licensees holding valid Qt Commercial licenses may use this file in
    00012 ** accordance with the Qt Commercial License Agreement provided with the
    00013 ** Software or, alternatively, in accordance with the terms contained in
    00014 ** a written agreement between you and Nokia.
    00015 **
    00016 ** GNU Lesser General Public License Usage
    00017 ** Alternatively, this file may be used under the terms of the GNU Lesser
    00018 ** General Public License version 2.1 as published by the Free Software
    00019 ** Foundation and appearing in the file LICENSE.LGPL included in the
    00020 ** packaging of this file.  Please review the following information to
    00021 ** ensure the GNU Lesser General Public License version 2.1 requirements
    00022 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
    00023 **
    00024 ** In addition, as a special exception, Nokia gives you certain additional
    00025 ** rights.  These rights are described in the Nokia Qt LGPL Exception
    00026 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this module.
    00027 **
    00028 ** GNU General Public License Usage
    00029 ** Alternatively, this file may be used under the terms of the GNU
    00030 ** General Public License version 3.0 as published by the Free Software
    00031 ** Foundation and appearing in the file LICENSE.GPL included in the
    00032 ** packaging of this file.  Please review the following information to
    00033 ** ensure the GNU General Public License version 3.0 requirements will be
    00034 ** met: http://www.gnu.org/copyleft/gpl.html.
    00035 **
    00036 ** If you have questions regarding the use of this file, please contact
    00037 ** Nokia at qt-info@nokia.com.
    00038 ** $QT_END_LICENSE$
    00039 **
    00040 ****************************************************************************/
    00041
    00042 #ifndef QLAYOUTITEM_H
    00043 #define QLAYOUTITEM_H
    00044
    00045 #include <QtGui/qsizepolicy.h>
    00046 #include <QtCore/qrect.h>
    00047
    00048 #include <limits.h>
    00049
    00050 QT_BEGIN_HEADER
    00051
    00052 QT_BEGIN_NAMESPACE
    00053
    00054 QT_MODULE(Gui)
    00055
    00056 static const int QLAYOUTSIZE_MAX = INT_MAX/256/16;
    00057
    00058 class QLayout;
    00059 class QLayoutItem;
    00060 class QSpacerItem;
    00061 class QWidget;
    00062 class QSize;
    00063
    00064 class Q_GUI_EXPORT QLayoutItem
    00065 {
    00066 public:
    00067     inline explicit QLayoutItem(Qt::Alignment alignment = 0);
    00068     virtual ~QLayoutItem();
    00069     virtual QSize sizeHint() const = 0;
    00070     virtual QSize minimumSize() const = 0;
    00071     virtual QSize maximumSize() const = 0;
    00072     virtual Qt::Orientations expandingDirections() const = 0;
    00073     virtual void setGeometry(const QRect&) = 0;
    00074     virtual QRect geometry() const = 0;
    00075     virtual bool isEmpty() const = 0;
    00076     virtual bool hasHeightForWidth() const;
    00077     virtual int heightForWidth(int) const;
    00078     virtual int minimumHeightForWidth(int) const;
    00079     virtual void invalidate();
    00080
    00081     virtual QWidget *widget();
    00082     virtual QLayout *layout();
    00083     virtual QSpacerItem *spacerItem();
    00084
    00085     Qt::Alignment alignment() const { return align; }
    00086     void setAlignment(Qt::Alignment a);
    00087     QSizePolicy::ControlTypes controlTypes() const;
    00088
    00089 protected:
    00090     Qt::Alignment align;
    00091 };
    00092
    00093 inline QLayoutItem::QLayoutItem(Qt::Alignment aalignment)
    00094     : align(aalignment) { }
    00095
    00096 class Q_GUI_EXPORT QSpacerItem : public QLayoutItem
    00097 {
    00098 public:
    00099     QSpacerItem(int w, int h,
    00100                  QSizePolicy::Policy hData = QSizePolicy::Minimum,
    00101                  QSizePolicy::Policy vData = QSizePolicy::Minimum)
    00102         : width(w), height(h), sizeP(hData, vData) { }
    00103     void changeSize(int w, int h,
    00104                      QSizePolicy::Policy hData = QSizePolicy::Minimum,
    00105                      QSizePolicy::Policy vData = QSizePolicy::Minimum);
    00106     QSize sizeHint() const;
    00107     QSize minimumSize() const;
    00108     QSize maximumSize() const;
    00109     Qt::Orientations expandingDirections() const;
    00110     bool isEmpty() const;
    00111     void setGeometry(const QRect&);
    00112     QRect geometry() const;
    00113     QSpacerItem *spacerItem();
    00114
    00115 private:
    00116     int width;
    00117     int height;
    00118     QSizePolicy sizeP;
    00119     QRect rect;
    00120 };
    00121
    00122 class Q_GUI_EXPORT QWidgetItem : public QLayoutItem
    00123 {
    00124     Q_DISABLE_COPY(QWidgetItem)
    00125
    00126 public:
    00127     explicit QWidgetItem(QWidget *w) : wid(w) { }
    00128     QSize sizeHint() const;
    00129     QSize minimumSize() const;
    00130     QSize maximumSize() const;
    00131     Qt::Orientations expandingDirections() const;
    00132     bool isEmpty() const;
    00133     void setGeometry(const QRect&);
    00134     QRect geometry() const;
    00135     virtual QWidget *widget();
    00136
    00137     bool hasHeightForWidth() const;
    00138     int heightForWidth(int) const;
    00139
    00140 protected:
    00141     QWidget *wid;
    00142 };
    00143
    00144 class Q_GUI_EXPORT QWidgetItemV2 : public QWidgetItem
    00145 {
    00146 public:
    00147     explicit QWidgetItemV2(QWidget *widget);
    00148     ~QWidgetItemV2();
    00149
    00150     QSize sizeHint() const;
    00151     QSize minimumSize() const;
    00152     QSize maximumSize() const;
    00153     int heightForWidth(int width) const;
    00154
    00155 private:
    00156     enum { Dirty = -123, HfwCacheMaxSize = 3 };
    00157
    00158     inline bool useSizeCache() const;
    00159     void updateCacheIfNecessary() const;
    00160     inline void invalidateSizeCache() {
    00161         q_cachedMinimumSize.setWidth(Dirty);
    00162         q_hfwCacheSize = 0;
    00163     }
    00164
    00165     mutable QSize q_cachedMinimumSize;
    00166     mutable QSize q_cachedSizeHint;
    00167     mutable QSize q_cachedMaximumSize;
    00168     mutable QSize q_cachedHfws[HfwCacheMaxSize];
    00169     mutable short q_firstCachedHfw;
    00170     mutable short q_hfwCacheSize;
    00171     void *d;
    00172
    00173     friend class QWidgetPrivate;
    00174
    00175     Q_DISABLE_COPY(QWidgetItemV2)
    00176 };
    00177
    00178 QT_END_NAMESPACE
    00179
    00180 QT_END_HEADER
    00181
    00182 #endif // QLAYOUTITEM_H