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/////////////////////////////////////////////////////////////////////////////
// Name: wx/wrapsizer.h
// Purpose: provide wrapping sizer for layout (wxWrapSizer)
// Author: Arne Steinarson
// Created: 2008-05-08
// Copyright: (c) Arne Steinarson
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifndef _WX_WRAPSIZER_H_
#define _WX_WRAPSIZER_H_
#include "wx/sizer.h"
// flags for wxWrapSizer
enum
{
wxEXTEND_LAST_ON_EACH_LINE = 1,
// don't leave spacers in the beginning of a new row
wxREMOVE_LEADING_SPACES = 2,
wxWRAPSIZER_DEFAULT_FLAGS = wxEXTEND_LAST_ON_EACH_LINE |
wxREMOVE_LEADING_SPACES
};
// ----------------------------------------------------------------------------
// A box sizer that can wrap items on several lines when sum of widths exceed
// available line width.
// ----------------------------------------------------------------------------
class WXDLLEXPORT wxWrapSizer : public wxBoxSizer
{
public:
wxWrapSizer(int orient = wxHORIZONTAL, int flags = wxWRAPSIZER_DEFAULT_FLAGS);
virtual ~wxWrapSizer();
// override base class virtual methods
virtual wxSize CalcMin();
virtual void RecalcSizes();
virtual bool InformFirstDirection(int direction,
int size,
int availableOtherDir);
protected:
// This method is called to decide if an item represents empty space or
// not. We do this to avoid having space-only items first or last on a
// wrapped line (left alignment).
//
// By default only spacers are considered to be empty items but a derived
// class may override this item if some other kind of sizer elements should
// be also considered empty for some reason.
virtual bool IsSpaceItem(wxSizerItem *item) const
{
return item->IsSpacer();
}
// helpers of CalcMin()
void CalcMinFromMinor(int totMinor);
void CalcMinFromMajor(int totMajor);
void CalcMinUsingCurrentLayout();
void CalcMinFittingSize(const wxSize& szBoundary);
void CalcMaxSingleItemSize();
// temporarily change the proportion of the last item of the N-th row to
// extend to the end of line if the appropriate flag is set
void AdjustLastRowItemProp(size_t n, wxSizerItem *itemLast);
// remove all the items from m_rows
void ClearRows();
// return the N-th row sizer from m_rows creating it if necessary
wxSizer *GetRowSizer(size_t n);
// should be called after completion of each row
void FinishRow(size_t n, int rowMajor, int rowMinor, wxSizerItem *itemLast);
const int m_flags; // Flags specified in the ctor
int m_dirInform; // Direction for size information
int m_availSize; // Size available in m_dirInform direction
int m_availableOtherDir; // Size available in the other direction
bool m_lastUsed; // Indicates whether value from InformFirst... has
// been used yet
// The sizes below are computed by RecalcSizes(), i.e. they don't have
// valid values during the initial call to CalcMin() and they are only
// valid for the current layout (i.e. the current number of rows)
int m_minSizeMinor; // Min size in minor direction
int m_maxSizeMajor; // Size of longest row
int m_minItemMajor; // Size of smallest item in major direction
wxBoxSizer m_rows; // Sizer containing multiple rows of our items
DECLARE_DYNAMIC_CLASS_NO_COPY(wxWrapSizer)
};
#endif // _WX_WRAPSIZER_H_
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