wxWidgets/include/wx/os2/region.h

/////////////////////////////////////////////////////////////////////////////
// Name:        region.h
// Purpose:     wxRegion class
// Author:      David Webster
// Modified by:
// Created:     10/15/99
// RCS-ID:      $Id$
// Copyright:   (c) David Webster
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifndef _WX_REGION_H_
#define _WX_REGION_H_

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

class WXDLLEXPORT wxRect;
class WXDLLEXPORT wxPoint;

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.
};

class WXDLLEXPORT wxRegion : public wxGDIObject {
DECLARE_DYNAMIC_CLASS(wxRegion);
    friend class WXDLLEXPORT wxRegionIterator;
public:
    wxRegion(wxCoord x, wxCoord y, wxCoord w, wxCoord h);
    wxRegion(const wxPoint& topLeft, const wxPoint& bottomRight);
    wxRegion(const wxRect& rect);
    wxRegion(WXHRGN hRegion); // Hangs on to this region

    wxRegion();
    ~wxRegion();

    //# Copying
    inline wxRegion(const wxRegion& r)
        { Ref(r); }
    inline wxRegion& operator = (const wxRegion& r)
        { Ref(r); return (*this); }

    //# Modify region
    // Clear current region
    void Clear();

    // Union rectangle or region with this.
    inline bool Union(wxCoord x, wxCoord y, wxCoord width, wxCoord height) { return Combine(x, y, width, height, wxRGN_OR); }
    inline bool Union(const wxRect& rect) { return Combine(rect, wxRGN_OR); }
    inline bool Union(const wxRegion& region) { return Combine(region, wxRGN_OR); }

    // Intersect rectangle or region with this.
    inline bool Intersect(wxCoord x, wxCoord y, wxCoord width, wxCoord height) { return Combine(x, y, width, height, wxRGN_AND); }
    inline bool Intersect(const wxRect& rect)  { return Combine(rect, wxRGN_AND); }
    inline bool Intersect(const wxRegion& region)  { return Combine(region, wxRGN_AND); }

    // Subtract rectangle or region from this:
    // Combines the parts of 'this' that are not part of the second region.
    inline bool Subtract(wxCoord x, wxCoord y, wxCoord width, wxCoord height) { return Combine(x, y, width, height, wxRGN_DIFF); }
    inline bool Subtract(const wxRect& rect)  { return Combine(rect, wxRGN_DIFF); }
    inline bool Subtract(const wxRegion& region)  { return Combine(region, wxRGN_DIFF); }

    // XOR: the union of two combined regions except for any overlapping areas.
    inline bool Xor(wxCoord x, wxCoord y, wxCoord width, wxCoord height) { return Combine(x, y, width, height, wxRGN_XOR); }
    inline bool Xor(const wxRect& rect)  { return Combine(rect, wxRGN_XOR); }
    inline bool Xor(const wxRegion& region)  { return Combine(region, wxRGN_XOR); }

    //# Information on region
    // Outer bounds of region
    void GetBox(wxCoord& x, wxCoord& y, wxCoord&w, wxCoord &h) const;
    wxRect GetBox() const ;

    // Is region empty?
    bool Empty() const;
    inline bool IsEmpty() const { return Empty(); }

    //# Tests
    // Does the region contain the point (x,y)?
    wxRegionContain Contains(wxCoord x, wxCoord y) const;
    // Does the region contain the point pt?
    wxRegionContain Contains(const wxPoint& pt) const;
    // Does the region contain the rectangle (x, y, w, h)?
    wxRegionContain Contains(wxCoord x, wxCoord y, wxCoord w, wxCoord h) const;
    // Does the region contain the rectangle rect?
    wxRegionContain Contains(const wxRect& rect) const;

// Internal
    bool Combine(wxCoord x, wxCoord y, wxCoord width, wxCoord height, wxRegionOp op);
    bool Combine(const wxRegion& region, wxRegionOp op);
    bool Combine(const wxRect& rect, wxRegionOp op);

    // Get internal region handle
    WXHRGN GetHRGN() const;
};

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

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

    operator bool () const { return m_current < m_numRects; }
    bool HaveRects() const { return m_current < m_numRects; }

    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 { return wxRect(GetX(), GetY(), GetWidth(), GetHeight()); }

private:
    long     m_current;
    long     m_numRects;
    wxRegion m_region;
    wxRect*  m_rects;
};

#endif
    // _WX_REGION_H_