wxWidgets/include/wx/gtk1/region.h

/////////////////////////////////////////////////////////////////////////////
// Name:        wx/gtk/region.h
// Purpose:
// Author:      Robert Roebling
// Id:          $Id$
// Copyright:   (c) 1998 Robert Roebling
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifndef _WX_GTK_REGION_H_
#define _WX_GTK_REGION_H_

#ifdef __GNUG__
#pragma interface
#endif

#include "wx/list.h"
#include "wx/gdiobj.h"
#include "wx/gdicmn.h"

//-----------------------------------------------------------------------------
// classes
//-----------------------------------------------------------------------------

class wxRegion;

//-----------------------------------------------------------------------------
// constants
//-----------------------------------------------------------------------------

enum wxRegionContain
{
    wxOutRegion = 0,
    wxPartRegion = 1,
    wxInRegion = 2
};

// So far, for internal use only
enum wxRegionOp
{
   wxRGN_AND,          // Creates the intersection of the two combined regions.
   wxRGN_COPY,         // Creates a copy of the region identified by hrgnSrc1.
   wxRGN_DIFF,         // Combines the parts of hrgnSrc1 that are not part of hrgnSrc2.
   wxRGN_OR,           // Creates the union of two combined regions.
   wxRGN_XOR           // Creates the union of two combined regions except for any overlapping areas.
};

// ----------------------------------------------------------------------------
// wxRegion
// ----------------------------------------------------------------------------

class wxRegion : public wxGDIObject
{
public:
    wxRegion( wxCoord x, wxCoord y, wxCoord w, wxCoord h );
    wxRegion( const wxPoint& topLeft, const wxPoint& bottomRight );
    wxRegion( const wxRect& rect );
    wxRegion();
    virtual ~wxRegion();

    wxRegion( const wxRegion& r ) { Ref(r); }
    wxRegion& operator = ( const wxRegion& r ) { Ref(r); return *this; }

    bool operator == ( const wxRegion& region );
    bool operator != ( const wxRegion& region );

    void Clear();

    bool Union( wxCoord x, wxCoord y, wxCoord width, wxCoord height );
    bool Union( const wxRect& rect );
    bool Union( const wxRegion& region );

    bool Intersect( wxCoord x, wxCoord y, wxCoord width, wxCoord height );
    bool Intersect( const wxRect& rect );
    bool Intersect( const wxRegion& region );

    bool Subtract( wxCoord x, wxCoord y, wxCoord width, wxCoord height );
    bool Subtract( const wxRect& rect );
    bool Subtract( const wxRegion& region );

    bool Xor( wxCoord x, wxCoord y, wxCoord width, wxCoord height );
    bool Xor( const wxRect& rect );
    bool Xor( const wxRegion& region );

    void GetBox( wxCoord& x, wxCoord& y, wxCoord&w, wxCoord &h ) const;
    wxRect GetBox() const ;

    bool Empty() const;
    bool IsEmpty() const { return Empty(); }

    wxRegionContain Contains( wxCoord x, wxCoord y ) const;
    wxRegionContain Contains( wxCoord x, wxCoord y, wxCoord w, wxCoord h ) const;
    wxRegionContain Contains(const wxPoint& pt) const;
    wxRegionContain Contains(const wxRect& rect) const;

public:
    wxList    *GetRectList() const;
    GdkRegion *GetRegion() const;

protected:
    // helper of Intersect()
    bool IntersectRegionOnly(const wxRegion& reg);

    // call this before modifying the region
    void Unshare();

private:
    DECLARE_DYNAMIC_CLASS(wxRegion);
};

// ----------------------------------------------------------------------------
// wxRegionIterator: decomposes a region into rectangles
// ----------------------------------------------------------------------------

class wxRegionIterator: public wxObject
{
public:
    wxRegionIterator();
    wxRegionIterator(const wxRegion& region);

    void Reset() { m_current = 0u; }
    void Reset(const wxRegion& region);

    operator bool () const;
    bool HaveRects() const;

    void operator ++ ();
    void operator ++ (int);

    wxCoord GetX() const;
    wxCoord GetY() const;
    wxCoord GetW() const;
    wxCoord GetWidth() const { return GetW(); }
    wxCoord GetH() const;
    wxCoord GetHeight() const { return GetH(); }
    wxRect GetRect() const;

private:
    size_t   m_current;
    wxRegion m_region;

private:
    DECLARE_DYNAMIC_CLASS(wxRegionIterator);
};


#endif
        // _WX_GTK_REGION_H_