Qwt User's Guide: qwt_dyngrid_layout.h Source File

00001 /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
00002  * Qwt Widget Library
00003  * Copyright (C) 1997   Josef Wilgen
00004  * Copyright (C) 2002   Uwe Rathmann
00005  *
00006  * This library is free software; you can redistribute it and/or
00007  * modify it under the terms of the Qwt License, Version 1.0
00008  *****************************************************************************/
00009 
00010 #ifndef QWT_DYNGRID_LAYOUT_H
00011 #define QWT_DYNGRID_LAYOUT_H
00012 
00013 #include <qlayout.h>
00014 #include <qsize.h>
00015 #if QT_VERSION >= 0x040000
00016 #include <qlist.h>
00017 #else
00018 #include <qvaluelist.h>
00019 #endif
00020 #include "qwt_global.h"
00021 #include "qwt_array.h"
00022 
00032 class QWT_EXPORT QwtDynGridLayout : public QLayout
00033 {
00034     Q_OBJECT
00035 public:
00036     explicit QwtDynGridLayout(QWidget *, int margin = 0, int space = -1);
00037 #if QT_VERSION < 0x040000
00038     explicit QwtDynGridLayout(QLayout *, int space = -1);
00039 #endif
00040     explicit QwtDynGridLayout(int space = -1);
00041 
00042     virtual ~QwtDynGridLayout();
00043 
00044     virtual void invalidate();
00045 
00046     void setMaxCols(uint maxCols);
00047     uint maxCols() const;
00048 
00049     uint numRows () const; 
00050     uint numCols () const;
00051 
00052     virtual void addItem(QLayoutItem *);
00053 
00054 #if QT_VERSION >= 0x040000
00055     virtual QLayoutItem *itemAt( int index ) const;
00056     virtual QLayoutItem *takeAt( int index );
00057     virtual int count() const;
00058 
00059     void setExpandingDirections(Qt::Orientations);
00060     virtual Qt::Orientations expandingDirections() const;
00061     QList<QRect> layoutItems(const QRect &, uint numCols) const;
00062 #else
00063     virtual QLayoutIterator iterator();
00064 
00065     void setExpanding(QSizePolicy::ExpandData);
00066     virtual QSizePolicy::ExpandData expanding() const;
00067     QValueList<QRect> layoutItems(const QRect &, uint numCols) const;
00068 #endif
00069 
00070     virtual int maxItemWidth() const;
00071 
00072     virtual void setGeometry(const QRect &rect);
00073 
00074     virtual bool hasHeightForWidth() const;
00075     virtual int heightForWidth(int) const;
00076 
00077     virtual QSize sizeHint() const;
00078 
00079     virtual bool isEmpty() const;
00080     uint itemCount() const;
00081 
00082     virtual uint columnsForWidth(int width) const;
00083 
00084 protected:
00085 
00086     void layoutGrid(uint numCols,
00087         QwtArray<int>& rowHeight, QwtArray<int>& colWidth) const;
00088     void stretchGrid(const QRect &rect, uint numCols, 
00089         QwtArray<int>& rowHeight, QwtArray<int>& colWidth) const;
00090 
00091 
00092 private:
00093     void init();
00094     int maxRowWidth(int numCols) const;
00095     void updateLayoutCache();
00096 
00097 #if QT_VERSION < 0x040000
00098 // xlC 5.1, the IBM/AIX C++ compiler, needs it to be public
00099 public:
00100 #endif
00101    class PrivateData;
00102 
00103 private:
00104     PrivateData *d_data;
00105 };
00106 
00107 #endif