qwt_dyngrid_layout.h

/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
 * Qwt Widget Library
 * Copyright (C) 1997   Josef Wilgen
 * Copyright (C) 2002   Uwe Rathmann
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the Qwt License, Version 1.0
 *****************************************************************************/

#ifndef QWT_DYNGRID_LAYOUT_H
#define QWT_DYNGRID_LAYOUT_H

#include <qlayout.h>
#include <qsize.h>
#if QT_VERSION >= 0x040000
#include <qlist.h>
#else
#include <qvaluelist.h>
#endif
#include "qwt_global.h"
#include "qwt_array.h"

class QWT_EXPORT QwtDynGridLayout : public QLayout
{
    Q_OBJECT
public:
    explicit QwtDynGridLayout(QWidget *, int margin = 0, int space = -1);
#if QT_VERSION < 0x040000
    explicit QwtDynGridLayout(QLayout *, int space = -1);
#endif
    explicit QwtDynGridLayout(int space = -1);

    virtual ~QwtDynGridLayout();

    virtual void invalidate();

    void setMaxCols(uint maxCols);
    uint maxCols() const;

    uint numRows () const; 
    uint numCols () const;

    virtual void addItem(QLayoutItem *);

#if QT_VERSION >= 0x040000
    virtual QLayoutItem *itemAt( int index ) const;
    virtual QLayoutItem *takeAt( int index );
    virtual int count() const;

    void setExpandingDirections(Qt::Orientations);
    virtual Qt::Orientations expandingDirections() const;
    QList<QRect> layoutItems(const QRect &, uint numCols) const;
#else
    virtual QLayoutIterator iterator();

    void setExpanding(QSizePolicy::ExpandData);
    virtual QSizePolicy::ExpandData expanding() const;
    QValueList<QRect> layoutItems(const QRect &, uint numCols) const;
#endif

    virtual int maxItemWidth() const;

    virtual void setGeometry(const QRect &rect);

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

    virtual QSize sizeHint() const;

    virtual bool isEmpty() const;
    uint itemCount() const;

    virtual uint columnsForWidth(int width) const;

protected:

    void layoutGrid(uint numCols,
        QwtArray<int>& rowHeight, QwtArray<int>& colWidth) const;
    void stretchGrid(const QRect &rect, uint numCols, 
        QwtArray<int>& rowHeight, QwtArray<int>& colWidth) const;


private:
    void init();
    int maxRowWidth(int numCols) const;
    void updateLayoutCache();

#if QT_VERSION < 0x040000
// xlC 5.1, the IBM/AIX C++ compiler, needs it to be public
public:
#endif
   class PrivateData;

private:
    PrivateData *d_data;
};

#endif