include/wx/region.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/region.h
   3 // Purpose:     Base header for wxRegion
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows Licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_REGION_H_BASE_
  13 #define _WX_REGION_H_BASE_
  14
  15 #include "wx/gdiobj.h"
  16 #include "wx/gdicmn.h"
  17
  18 class WXDLLIMPEXP_FWD_CORE wxBitmap;
  19 class WXDLLIMPEXP_FWD_CORE wxColour;
  20 class WXDLLIMPEXP_FWD_CORE wxRegion;
  21
  22 // ----------------------------------------------------------------------------
  23 // constants
  24 // ----------------------------------------------------------------------------
  25
  26 // result of wxRegion::Contains() call
  27 enum wxRegionContain
  28 {
  29     wxOutRegion = 0,
  30     wxPartRegion = 1,
  31     wxInRegion = 2
  32 };
  33
  34 // these constants are used with wxRegion::Combine() in the ports which have
  35 // this method
  36 enum wxRegionOp
  37 {
  38     // Creates the intersection of the two combined regions.
  39     wxRGN_AND,
  40
  41     // Creates a copy of the region
  42     wxRGN_COPY,
  43
  44     // Combines the parts of first region that are not in the second one
  45     wxRGN_DIFF,
  46
  47     // Creates the union of two combined regions.
  48     wxRGN_OR,
  49
  50     // Creates the union of two regions except for any overlapping areas.
  51     wxRGN_XOR
  52 };
  53
  54 // ----------------------------------------------------------------------------
  55 // wxRegionBase defines wxRegion API
  56 // ----------------------------------------------------------------------------
  57
  58 class WXDLLIMPEXP_CORE wxRegionBase : public wxGDIObject
  59 {
  60 public:
  61     // ctors
  62     // -----
  63
  64     // none are defined here but the following should be available:
  65 #if 0
  66     wxRegion();
  67     wxRegion(wxCoord x, wxCoord y, wxCoord w, wxCoord h);
  68     wxRegion(const wxPoint& topLeft, const wxPoint& bottomRight);
  69     wxRegion(const wxRect& rect);
  70     wxRegion(size_t n, const wxPoint *points, int fillStyle = wxODDEVEN_RULE);
  71     wxRegion(const wxBitmap& bmp);
  72     wxRegion(const wxBitmap& bmp, const wxColour& transp, int tolerance = 0);
  73 #endif // 0
  74
  75     // operators
  76     // ---------
  77
  78     bool operator==(const wxRegion& region) const { return IsEqual(region); }
  79     bool operator!=(const wxRegion& region) const { return !(*this == region); }
  80
  81
  82     // accessors
  83     // ---------
  84
  85     // Is region empty?
  86     virtual bool IsEmpty() const = 0;
  87     bool Empty() const { return IsEmpty(); }
  88
  89     // Is region equal (i.e. covers the same area as another one)?
  90     bool IsEqual(const wxRegion& region) const;
  91
  92     // Get the bounding box
  93     bool GetBox(wxCoord& x, wxCoord& y, wxCoord& w, wxCoord& h) const
  94         { return DoGetBox(x, y, w, h); }
  95     wxRect GetBox() const
  96     {
  97         wxCoord x, y, w, h;
  98         return DoGetBox(x, y, w, h) ? wxRect(x, y, w, h) : wxRect();
  99     }
 100
 101     // Test if the given point or rectangle is inside this region
 102     wxRegionContain Contains(wxCoord x, wxCoord y) const
 103         { return DoContainsPoint(x, y); }
 104     wxRegionContain Contains(const wxPoint& pt) const
 105         { return DoContainsPoint(pt.x, pt.y); }
 106     wxRegionContain Contains(wxCoord x, wxCoord y, wxCoord w, wxCoord h) const
 107         { return DoContainsRect(wxRect(x, y, w, h)); }
 108     wxRegionContain Contains(const wxRect& rect) const
 109         { return DoContainsRect(rect); }
 110
 111
 112     // operations
 113     // ----------
 114
 115     virtual void Clear() = 0;
 116
 117     // Move the region
 118     bool Offset(wxCoord x, wxCoord y)
 119         { return DoOffset(x, y); }
 120     bool Offset(const wxPoint& pt)
 121         { return DoOffset(pt.x, pt.y); }
 122
 123     // Union rectangle or region with this region.
 124     bool Union(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 125         { return DoUnionWithRect(wxRect(x, y, w, h)); }
 126     bool Union(const wxRect& rect)
 127         { return DoUnionWithRect(rect); }
 128     bool Union(const wxRegion& region)
 129         { return DoUnionWithRegion(region); }
 130
 131 #if wxUSE_IMAGE
 132     // Use the non-transparent pixels of a wxBitmap for the region to combine
 133     // with this region.  First version takes transparency from bitmap's mask,
 134     // second lets the user specify the colour to be treated as transparent
 135     // along with an optional tolerance value.
 136     // NOTE: implemented in common/rgncmn.cpp
 137     bool Union(const wxBitmap& bmp);
 138     bool Union(const wxBitmap& bmp, const wxColour& transp, int tolerance = 0);
 139 #endif // wxUSE_IMAGE
 140
 141     // Intersect rectangle or region with this one.
 142     bool Intersect(wxCoord x, wxCoord y, wxCoord w, wxCoord h);
 143     bool Intersect(const wxRect& rect);
 144     bool Intersect(const wxRegion& region)
 145         { return DoIntersect(region); }
 146
 147     // Subtract rectangle or region from this:
 148     // Combines the parts of 'this' that are not part of the second region.
 149     bool Subtract(wxCoord x, wxCoord y, wxCoord w, wxCoord h);
 150     bool Subtract(const wxRect& rect);
 151     bool Subtract(const wxRegion& region)
 152         { return DoSubtract(region); }
 153
 154     // XOR: the union of two combined regions except for any overlapping areas.
 155     bool Xor(wxCoord x, wxCoord y, wxCoord w, wxCoord h);
 156     bool Xor(const wxRect& rect);
 157     bool Xor(const wxRegion& region)
 158         { return DoXor(region); }
 159
 160
 161     // Convert the region to a B&W bitmap with the white pixels being inside
 162     // the region.
 163     wxBitmap ConvertToBitmap() const;
 164
 165 protected:
 166     virtual bool DoIsEqual(const wxRegion& region) const = 0;
 167     virtual bool DoGetBox(wxCoord& x, wxCoord& y, wxCoord& w, wxCoord& h) const = 0;
 168     virtual wxRegionContain DoContainsPoint(wxCoord x, wxCoord y) const = 0;
 169     virtual wxRegionContain DoContainsRect(const wxRect& rect) const = 0;
 170
 171     virtual bool DoOffset(wxCoord x, wxCoord y) = 0;
 172
 173     virtual bool DoUnionWithRect(const wxRect& rect) = 0;
 174     virtual bool DoUnionWithRegion(const wxRegion& region) = 0;
 175
 176     virtual bool DoIntersect(const wxRegion& region) = 0;
 177     virtual bool DoSubtract(const wxRegion& region) = 0;
 178     virtual bool DoXor(const wxRegion& region) = 0;
 179 };
 180
 181 // some ports implement a generic Combine() function while others only
 182 // implement individual wxRegion operations, factor out the common code for the
 183 // ports with Combine() in this class
 184 #if defined(__WXPALMOS__) || \
 185     defined(__WXMSW__) || \
 186     defined(__WXMAC__) || \
 187     defined(__WXPM__)
 188
 189 #define wxHAS_REGION_COMBINE
 190
 191 class WXDLLIMPEXP_CORE wxRegionWithCombine : public wxRegionBase
 192 {
 193 public:
 194     // these methods are not part of public API as they're not implemented on
 195     // all ports
 196     bool Combine(wxCoord x, wxCoord y, wxCoord w, wxCoord h, wxRegionOp op);
 197     bool Combine(const wxRect& rect, wxRegionOp op);
 198     bool Combine(const wxRegion& region, wxRegionOp op)
 199         { return DoCombine(region, op); }
 200
 201
 202 protected:
 203     // the real Combine() method, to be defined in the derived class
 204     virtual bool DoCombine(const wxRegion& region, wxRegionOp op) = 0;
 205
 206     // implement some wxRegionBase pure virtuals in terms of Combine()
 207     virtual bool DoUnionWithRect(const wxRect& rect);
 208     virtual bool DoUnionWithRegion(const wxRegion& region);
 209     virtual bool DoIntersect(const wxRegion& region);
 210     virtual bool DoSubtract(const wxRegion& region);
 211     virtual bool DoXor(const wxRegion& region);
 212 };
 213
 214 #endif // ports with wxRegion::Combine()
 215
 216 #if defined(__WXPALMOS__)
 217     #include "wx/palmos/region.h"
 218 #elif defined(__WXMSW__)
 219     #include "wx/msw/region.h"
 220 #elif defined(__WXGTK20__)
 221     #include "wx/gtk/region.h"
 222 #elif defined(__WXGTK__)
 223     #include "wx/gtk1/region.h"
 224 #elif defined(__WXMOTIF__) || defined(__WXX11__)
 225     #include "wx/x11/region.h"
 226 #elif defined(__WXMGL__)
 227     #include "wx/mgl/region.h"
 228 #elif defined(__WXDFB__)
 229     #include "wx/dfb/region.h"
 230 #elif defined(__WXMAC__)
 231     #include "wx/mac/region.h"
 232 #elif defined(__WXCOCOA__)
 233     #include "wx/cocoa/region.h"
 234 #elif defined(__WXPM__)
 235     #include "wx/os2/region.h"
 236 #endif
 237
 238 // ----------------------------------------------------------------------------
 239 // inline functions implementation
 240 // ----------------------------------------------------------------------------
 241
 242 // NB: these functions couldn't be defined in the class declaration as they use
 243 //     wxRegion and so can be only defined after including the header declaring
 244 //     the real class
 245
 246 inline bool wxRegionBase::Intersect(const wxRect& rect)
 247 {
 248     return DoIntersect(wxRegion(rect));
 249 }
 250
 251 inline bool wxRegionBase::Subtract(const wxRect& rect)
 252 {
 253     return DoSubtract(wxRegion(rect));
 254 }
 255
 256 inline bool wxRegionBase::Xor(const wxRect& rect)
 257 {
 258     return DoXor(wxRegion(rect));
 259 }
 260
 261 // ...and these functions are here because they call the ones above, and its
 262 // not really proper to call an inline function before its defined inline.
 263
 264 inline bool wxRegionBase::Intersect(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 265 {
 266     return Intersect(wxRect(x, y, w, h));
 267 }
 268
 269 inline bool wxRegionBase::Subtract(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 270 {
 271     return Subtract(wxRect(x, y, w, h));
 272 }
 273
 274 inline bool wxRegionBase::Xor(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
 275 {
 276     return Xor(wxRect(x, y, w, h));
 277 }
 278
 279 #ifdef wxHAS_REGION_COMBINE
 280
 281 inline bool wxRegionWithCombine::Combine(wxCoord x,
 282                                          wxCoord y,
 283                                          wxCoord w,
 284                                          wxCoord h,
 285                                          wxRegionOp op)
 286 {
 287     return DoCombine(wxRegion(x, y, w, h), op);
 288 }
 289
 290 inline bool wxRegionWithCombine::Combine(const wxRect& rect, wxRegionOp op)
 291 {
 292     return DoCombine(wxRegion(rect), op);
 293 }
 294
 295 #endif // wxHAS_REGION_COMBINE
 296
 297 #endif // _WX_REGION_H_BASE_