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# qlayout.h

This is the verbatim text of the qlayout.h include file. It is provided only for illustration; the copyright remains with Trolltech.

    /****************************************************************************
    ** $Id: qt/qlayout.h   3.3.7   edited Aug 31 2005 $
    **
    ** Definition of layout classes
    **
    ** Created : 960416
    **
    ** Copyright (C) 1992-2005 Trolltech AS.  All rights reserved.
    **
    ** This file is part of the kernel module of the Qt GUI Toolkit.
    **
    ** This file may be distributed under the terms of the Q Public License
    ** as defined by Trolltech AS of Norway and appearing in the file
    ** LICENSE.QPL included in the packaging of this file.
    **
    ** This file may be distributed and/or modified under the terms of the
    ** GNU General Public License version 2 as published by the Free Software
    ** Foundation and appearing in the file LICENSE.GPL included in the
    ** packaging of this file.
    **
    ** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
    ** licenses may use this file in accordance with the Qt Commercial License
    ** Agreement provided with the Software.
    **
    ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
    **
    ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
    **   information about Qt Commercial License Agreements.
    ** See http://www.trolltech.com/qpl/ for QPL licensing information.
    ** See http://www.trolltech.com/gpl/ for GPL licensing information.
    **
    ** Contact info@trolltech.com if any conditions of this licensing are
    ** not clear to you.
    **
    **********************************************************************/

    #ifndef QLAYOUT_H
    #define QLAYOUT_H

    #ifndef QT_H
    #include "qobject.h"
    #include "qsizepolicy.h"
    #include "qwidget.h"
    #endif // QT_H

    #include <limits.h>

    #ifndef QT_NO_LAYOUT

    #if 0
    Q_OBJECT
    #endif

    static const int QLAYOUTSIZE_MAX = INT_MAX/256/16;

    class QGridLayoutBox;
    class QGridLayoutData;
    class QLayout;
    class QLayoutItem;
    struct QLayoutData;
    class QMenuBar;
    class QSpacerItem;
    class QWidget;

    class Q_EXPORT QGLayoutIterator : public QShared
    {
    public:
        virtual ~QGLayoutIterator();
        virtual QLayoutItem *next() = 0;
        virtual QLayoutItem *current() = 0;
        virtual QLayoutItem *takeCurrent() = 0;
    };

    class Q_EXPORT QLayoutIterator
    {
    public:
        QLayoutIterator( QGLayoutIterator *i ) : it( i ) { }
        QLayoutIterator( const QLayoutIterator &i ) : it( i.it ) {
    	if ( it )
    	    it->ref();
        }
        ~QLayoutIterator() { if ( it && it->deref() ) delete it; }
        QLayoutIterator &operator=( const QLayoutIterator &i ) {
    	if ( i.it )
    	    i.it->ref();
    	if ( it && it->deref() )
    	    delete it;
    	it = i.it;
    	return *this;
        }
        QLayoutItem *operator++() { return it ? it->next() : 0; }
        QLayoutItem *current() { return it ? it->current() : 0; }
        QLayoutItem *takeCurrent() { return it ? it->takeCurrent() : 0; }
        void deleteCurrent();

    private:
        QGLayoutIterator *it;
    };

    class Q_EXPORT QLayoutItem
    {
    public:
        QLayoutItem( int alignment = 0 ) : align( alignment ) { }
        virtual ~QLayoutItem();
        virtual QSize sizeHint() const = 0;
        virtual QSize minimumSize() const = 0;
        virtual QSize maximumSize() const = 0;
        virtual QSizePolicy::ExpandData expanding() 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;
        // ### add minimumHeightForWidth( int ) in Qt 4.0
        virtual void invalidate();

        virtual QWidget *widget();
        virtual QLayoutIterator iterator();
        virtual QLayout *layout();
        virtual QSpacerItem *spacerItem();

        int alignment() const { return align; }
        virtual void setAlignment( int a );

    protected:
        int align;
    };

    class Q_EXPORT QSpacerItem : public QLayoutItem
    {
    public:
        QSpacerItem( int w, int h,
    		 QSizePolicy::SizeType hData = QSizePolicy::Minimum,
    		 QSizePolicy::SizeType vData = QSizePolicy::Minimum )
    	: width( w ), height( h ), sizeP( hData, vData ) { }
        void changeSize( int w, int h,
    		     QSizePolicy::SizeType hData = QSizePolicy::Minimum,
    		     QSizePolicy::SizeType vData = QSizePolicy::Minimum );
        QSize sizeHint() const;
        QSize minimumSize() const;
        QSize maximumSize() const;
        QSizePolicy::ExpandData expanding() const;
        bool isEmpty() const;
        void setGeometry( const QRect& );
        QRect geometry() const;
        QSpacerItem *spacerItem();

    private:
        int width;
        int height;
        QSizePolicy sizeP;
        QRect rect;
    };

    class Q_EXPORT QWidgetItem : public QLayoutItem
    {
    public:
        QWidgetItem( QWidget *w ) : wid( w ) { }
        QSize sizeHint() const;
        QSize minimumSize() const;
        QSize maximumSize() const;
        QSizePolicy::ExpandData expanding() const;
        bool isEmpty() const;
        void setGeometry( const QRect& );
        QRect geometry() const;
        virtual QWidget *widget();

        bool hasHeightForWidth() const;
        int heightForWidth( int ) const;

    private:
        QWidget *wid;
    };

    class Q_EXPORT QLayout : public QObject, public QLayoutItem
    {
        Q_OBJECT
        Q_ENUMS( ResizeMode )
        Q_PROPERTY( int margin READ margin WRITE setMargin )
        Q_PROPERTY( int spacing READ spacing WRITE setSpacing )
        Q_PROPERTY( ResizeMode resizeMode READ resizeMode WRITE setResizeMode )

    public:
        // ### Qt 4.0: put 'Auto' first in enum
        enum ResizeMode { FreeResize, Minimum, Fixed, Auto };

        QLayout( QWidget *parent, int margin = 0, int spacing = -1,
    	     const char *name = 0 );
        QLayout( QLayout *parentLayout, int spacing = -1, const char *name = 0 );
        QLayout( int spacing = -1, const char *name = 0 );
        ~QLayout();

        int margin() const { return outsideBorder; }
        int spacing() const { return insideSpacing; }

        virtual void setMargin( int );
        virtual void setSpacing( int );

        int defaultBorder() const { return insideSpacing; }
        void freeze( int w, int h );
        void freeze() { setResizeMode( Fixed ); }

        void setResizeMode( ResizeMode );
        ResizeMode resizeMode() const;

    #ifndef QT_NO_MENUBAR
        virtual void setMenuBar( QMenuBar *w );
        QMenuBar *menuBar() const { return menubar; }
    #endif

        QWidget *mainWidget();
        bool isTopLevel() const { return topLevel; }

        virtual void setAutoAdd( bool );
        bool autoAdd() const { return autoNewChild; }

        void invalidate();
        QRect geometry() const;
        bool activate();

        void add( QWidget *w ) { addItem( new QWidgetItem(w) ); }
        virtual void addItem( QLayoutItem * ) = 0;

        void remove( QWidget *w );
        void removeItem( QLayoutItem * );

        QSizePolicy::ExpandData expanding() const;
        QSize minimumSize() const;
        QSize maximumSize() const;
        void setGeometry( const QRect& ) = 0;
        QLayoutIterator iterator() = 0;
        bool isEmpty() const;

        int totalHeightForWidth( int w ) const;
        QSize totalMinimumSize() const;
        QSize totalMaximumSize() const;
        QSize totalSizeHint() const;
        QLayout *layout();

        bool supportsMargin() const { return marginImpl; }

        void setEnabled( bool );
        bool isEnabled() const;

    protected:
        bool eventFilter( QObject *, QEvent * );
        void childEvent( QChildEvent *e );
        void addChildLayout( QLayout *l );
        void deleteAllItems();

        void setSupportsMargin( bool );
        QRect alignmentRect( const QRect& ) const;

    private:
        void setWidgetLayout( QWidget *, QLayout * );
        void init();
        int insideSpacing;
        int outsideBorder;
        uint topLevel : 1;
        uint enabled : 1;
        uint autoNewChild : 1;
        uint frozen : 1;
        uint activated : 1;
        uint marginImpl : 1;
        uint autoMinimum : 1;
        uint autoResizeMode : 1;
        QRect rect;
        QLayoutData *extraData;
    #ifndef QT_NO_MENUBAR
        QMenuBar *menubar;
    #endif

    private:
    #if defined(Q_DISABLE_COPY)
        QLayout( const QLayout & );
        QLayout &operator=( const QLayout & );
    #endif

        static void propagateSpacing( QLayout *layout );
    };

    inline void QLayoutIterator::deleteCurrent()
    {
        delete takeCurrent();
    }

    class Q_EXPORT QGridLayout : public QLayout
    {
        Q_OBJECT
    public:
        QGridLayout( QWidget *parent, int nRows = 1, int nCols = 1, int border = 0,
    		 int spacing = -1, const char *name = 0 );
        QGridLayout( int nRows = 1, int nCols = 1, int spacing = -1,
    		 const char *name = 0 );
        QGridLayout( QLayout *parentLayout, int nRows = 1, int nCols = 1,
    		 int spacing = -1, const char *name = 0 );
        ~QGridLayout();

        QSize sizeHint() const;
        QSize minimumSize() const;
        QSize maximumSize() const;

        // ### remove 'virtual' in 4.0 (or add 'virtual' to set{Row,Col}Spacing())
        virtual void setRowStretch( int row, int stretch );
        virtual void setColStretch( int col, int stretch );
        int rowStretch( int row ) const;
        int colStretch( int col ) const;

        void setRowSpacing( int row, int minSize );
        void setColSpacing( int col, int minSize );
        int rowSpacing( int row ) const;
        int colSpacing( int col ) const;

        int numRows() const;
        int numCols() const;
        QRect cellGeometry( int row, int col ) const;

        bool hasHeightForWidth() const;
        int heightForWidth( int ) const;
        int minimumHeightForWidth( int ) const;

        QSizePolicy::ExpandData expanding() const;
        void invalidate();

        void addItem( QLayoutItem * );
        void addItem( QLayoutItem *item, int row, int col );
        void addMultiCell( QLayoutItem *, int fromRow, int toRow,
    			       int fromCol, int toCol, int align = 0 );

        void addWidget( QWidget *, int row, int col, int align = 0 );
        void addMultiCellWidget( QWidget *, int fromRow, int toRow,
    			     int fromCol, int toCol, int align = 0 );
        void addLayout( QLayout *layout, int row, int col);
        void addMultiCellLayout( QLayout *layout, int fromRow, int toRow,
    			     int fromCol, int toCol, int align = 0 );
        void addRowSpacing( int row, int minsize );
        void addColSpacing( int col, int minsize );

        void expand( int rows, int cols );

        enum Corner { TopLeft, TopRight, BottomLeft, BottomRight };
        void setOrigin( Corner );
        Corner origin() const;
        QLayoutIterator iterator();
        void setGeometry( const QRect& );

    protected:
        bool findWidget( QWidget* w, int *r, int *c );
        void add( QLayoutItem*, int row, int col );

    private:
    #if defined(Q_DISABLE_COPY)
        QGridLayout( const QGridLayout & );
        QGridLayout &operator=( const QGridLayout & );
    #endif

        void init( int rows, int cols );
        QGridLayoutData *data;
    };

    class QBoxLayoutData;
    class QDockWindow;

    class Q_EXPORT QBoxLayout : public QLayout
    {
        Q_OBJECT
    public:
        enum Direction { LeftToRight, RightToLeft, TopToBottom, BottomToTop,
    		     Down = TopToBottom, Up = BottomToTop };

        QBoxLayout( QWidget *parent, Direction, int border = 0, int spacing = -1,
    		const char *name = 0 );
        QBoxLayout( QLayout *parentLayout, Direction, int spacing = -1,
    		const char *name = 0 );
        QBoxLayout( Direction, int spacing = -1, const char *name = 0 );
        ~QBoxLayout();

        void addItem( QLayoutItem * );

        Direction direction() const { return dir; }
        void setDirection( Direction );

        void addSpacing( int size );
        void addStretch( int stretch = 0 );
        void addWidget( QWidget *, int stretch = 0, int alignment = 0 );
        void addLayout( QLayout *layout, int stretch = 0 );
        void addStrut( int );

        void insertSpacing( int index, int size );
        void insertStretch( int index, int stretch = 0 );
        void insertWidget( int index, QWidget *widget, int stretch = 0,
    		       int alignment = 0 );
        void insertLayout( int index, QLayout *layout, int stretch = 0 );

        bool setStretchFactor( QWidget*, int stretch );
        bool setStretchFactor( QLayout *l, int stretch );

        QSize sizeHint() const;
        QSize minimumSize() const;
        QSize maximumSize() const;

        bool hasHeightForWidth() const;
        int heightForWidth( int ) const;
        int minimumHeightForWidth( int ) const;

        QSizePolicy::ExpandData expanding() const;
        void invalidate();
        QLayoutIterator iterator();
        void setGeometry( const QRect& );

        int findWidget( QWidget* w );

    protected:
        void insertItem( int index, QLayoutItem * );

    private:
        friend class QDockWindow;
    #if defined(Q_DISABLE_COPY)
        QBoxLayout( const QBoxLayout & );
        QBoxLayout &operator=( const QBoxLayout & );
    #endif

        void setupGeom();
        void calcHfw( int );
        QBoxLayoutData *data;
        Direction dir;
        QBoxLayout *createTmpCopy();
    };

    class Q_EXPORT QHBoxLayout : public QBoxLayout
    {
        Q_OBJECT
    public:
        QHBoxLayout( QWidget *parent, int border = 0,
    		 int spacing = -1, const char *name = 0 );
        QHBoxLayout( QLayout *parentLayout,
    		 int spacing = -1, const char *name = 0 );
        QHBoxLayout( int spacing = -1, const char *name = 0 );

        ~QHBoxLayout();

    private:	// Disabled copy constructor and operator=
    #if defined(Q_DISABLE_COPY)
        QHBoxLayout( const QHBoxLayout & );
        QHBoxLayout &operator=( const QHBoxLayout & );
    #endif
    };

    class Q_EXPORT QVBoxLayout : public QBoxLayout
    {
        Q_OBJECT
    public:
        QVBoxLayout( QWidget *parent, int border = 0,
    		 int spacing = -1, const char *name = 0 );
        QVBoxLayout( QLayout *parentLayout,
    		 int spacing = -1, const char *name = 0 );
        QVBoxLayout( int spacing = -1, const char *name = 0 );

        ~QVBoxLayout();

    private:	// Disabled copy constructor and operator=
    #if defined(Q_DISABLE_COPY)
        QVBoxLayout( const QVBoxLayout & );
        QVBoxLayout &operator=( const QVBoxLayout & );
    #endif
    };

    #endif // QT_NO_LAYOUT
    #endif // QLAYOUT_H