interface/wx/brush.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        brush.h
   3 // Purpose:     interface of wxBrush
   4 // Author:      wxWidgets team
   5 // RCS-ID:      $Id$
   6 // Licence:     wxWindows license
   7 /////////////////////////////////////////////////////////////////////////////
   8
   9 /**
  10     The possible brush styles.
  11 */
  12 enum wxBrushStyle
  13 {
  14     wxBRUSHSTYLE_INVALID = -1,
  15
  16     wxBRUSHSTYLE_SOLID = wxSOLID,
  17         /**< Solid. */
  18
  19     wxBRUSHSTYLE_TRANSPARENT = wxTRANSPARENT,
  20         /**< Transparent (no fill). */
  21
  22     wxBRUSHSTYLE_STIPPLE_MASK_OPAQUE = wxSTIPPLE_MASK_OPAQUE,
  23         /**< Uses a bitmap as a stipple; the mask is used for blitting monochrome
  24              using text foreground and background colors. */
  25
  26     wxBRUSHSTYLE_STIPPLE_MASK = wxSTIPPLE_MASK,
  27         /**< Uses a bitmap as a stipple; mask is used for masking areas in the
  28              stipple bitmap. */
  29
  30     wxBRUSHSTYLE_STIPPLE = wxSTIPPLE,
  31         /**< Uses a bitmap as a stipple. */
  32
  33     wxBRUSHSTYLE_BDIAGONAL_HATCH = wxBDIAGONAL_HATCH,
  34         /**< Backward diagonal hatch. */
  35
  36     wxBRUSHSTYLE_CROSSDIAG_HATCH = wxCROSSDIAG_HATCH,
  37         /**< Cross-diagonal hatch. */
  38
  39     wxBRUSHSTYLE_FDIAGONAL_HATCH = wxFDIAGONAL_HATCH,
  40         /**< Forward diagonal hatch. */
  41
  42     wxBRUSHSTYLE_CROSS_HATCH = wxCROSS_HATCH,
  43         /**< Cross hatch. */
  44
  45     wxBRUSHSTYLE_HORIZONTAL_HATCH = wxHORIZONTAL_HATCH,
  46         /**< Horizontal hatch. */
  47
  48     wxBRUSHSTYLE_VERTICAL_HATCH = wxVERTICAL_HATCH,
  49         /**< Vertical hatch. */
  50
  51     wxBRUSHSTYLE_FIRST_HATCH = wxFIRST_HATCH,
  52     wxBRUSHSTYLE_LAST_HATCH = wxLAST_HATCH,
  53 };
  54
  55
  56
  57 /**
  58     @class wxBrush
  59
  60     A brush is a drawing tool for filling in areas. It is used for painting
  61     the background of rectangles, ellipses, etc. It has a colour and a style.
  62
  63     On a monochrome display, wxWidgets shows all brushes as white unless the
  64     colour is really black.
  65
  66     Do not initialize objects on the stack before the program commences, since
  67     other required structures may not have been set up yet. Instead, define
  68     global pointers to objects and create them in wxApp::OnInit or when required.
  69
  70     An application may wish to create brushes with different characteristics
  71     dynamically, and there is the consequent danger that a large number of
  72     duplicate brushes will be created. Therefore an application may wish to
  73     get a pointer to a brush by using the global list of brushes ::wxTheBrushList,
  74     and calling the member function wxBrushList::FindOrCreateBrush().
  75
  76     This class uses reference counting and copy-on-write internally so that
  77     assignments between two instances of this class are very cheap.
  78     You can therefore use actual objects instead of pointers without efficiency problems.
  79     If an instance of this class is changed it will create its own data internally
  80     so that other instances, which previously shared the data using the reference
  81     counting, are not affected.
  82
  83     @library{wxcore}
  84     @category{gdi}
  85
  86     @stdobjects
  87     @li ::wxNullBrush
  88     @li ::wxBLACK_BRUSH
  89     @li ::wxBLUE_BRUSH
  90     @li ::wxCYAN_BRUSH
  91     @li ::wxGREEN_BRUSH
  92     @li ::wxYELLOW_BRUSH
  93     @li ::wxGREY_BRUSH
  94     @li ::wxLIGHT_GREY_BRUSH
  95     @li ::wxMEDIUM_GREY_BRUSH
  96     @li ::wxRED_BRUSH
  97     @li ::wxTRANSPARENT_BRUSH
  98     @li ::wxWHITE_BRUSH
  99
 100     @see wxBrushList, wxDC, wxDC::SetBrush
 101 */
 102 class wxBrush : public wxGDIObject
 103 {
 104 public:
 105     /**
 106         Default constructor.
 107         The brush will be uninitialised, and wxBrush:IsOk() will return @false.
 108     */
 109     wxBrush();
 110
 111     /**
 112         Constructs a brush from a colour object and @a style.
 113
 114         @param colour
 115             Colour object.
 116         @param style
 117             One of the ::wxBrushStyle enumeration values.
 118     */
 119     wxBrush(const wxColour& colour, wxBrushStyle style = wxBRUSHSTYLE_SOLID);
 120
 121     /**
 122         Constructs a stippled brush using a bitmap.
 123         The brush style will be set to @c wxBRUSHSTYLE_STIPPLE.
 124     */
 125     wxBrush(const wxBitmap& stippleBitmap);
 126
 127     /**
 128         Copy constructor, uses @ref overview_refcount "reference counting".
 129     */
 130     wxBrush(const wxBrush& brush);
 131
 132     /**
 133         Destructor.
 134
 135         See @ref overview_refcount_destruct for more info.
 136
 137         @remarks Although all remaining brushes are deleted when the application
 138                  exits, the application should try to clean up all brushes itself.
 139                  This is because wxWidgets cannot know if a pointer to the brush
 140                  object is stored in an application data structure, and there is
 141                  a risk of double deletion.
 142     */
 143     virtual ~wxBrush();
 144
 145     /**
 146         Returns a reference to the brush colour.
 147
 148         @see SetColour()
 149     */
 150     virtual wxColour GetColour() const;
 151
 152     /**
 153         Gets a pointer to the stipple bitmap. If the brush does not have a @c wxBRUSHSTYLE_STIPPLE
 154         style, this bitmap may be non-@NULL but uninitialised (i.e. wxBitmap:IsOk() returns @false).
 155
 156         @see SetStipple()
 157     */
 158     virtual wxBitmap* GetStipple() const;
 159
 160     /**
 161         Returns the brush style, one of the ::wxBrushStyle values.
 162
 163         @see SetStyle(), SetColour(), SetStipple()
 164     */
 165     virtual wxBrushStyle GetStyle() const;
 166
 167     /**
 168         Returns @true if the style of the brush is any of hatched fills.
 169
 170         @see GetStyle()
 171     */
 172     virtual bool IsHatch() const;
 173
 174     /**
 175         Returns @true if the brush is initialised. It will return @false if the default
 176         constructor has been used (for example, the brush is a member of a class, or
 177         @NULL has been assigned to it).
 178     */
 179     virtual bool IsOk() const;
 180
 181     //@{
 182     /**
 183         Sets the brush colour using red, green and blue values.
 184
 185         @see GetColour()
 186     */
 187     virtual void SetColour(const wxColour& colour);
 188     virtual void SetColour(unsigned char red, unsigned char green, unsigned char blue);
 189     //@}
 190
 191     /**
 192         Sets the stipple bitmap.
 193
 194         @param bitmap
 195             The bitmap to use for stippling.
 196
 197         @remarks The style will be set to @c wxBRUSHSTYLE_STIPPLE, unless the bitmap
 198                  has a mask associated to it, in which case the style will be set
 199                  to @c wxBRUSHSTYLE_STIPPLE_MASK_OPAQUE.
 200
 201         @see wxBitmap
 202     */
 203     virtual void SetStipple(const wxBitmap& bitmap);
 204
 205     /**
 206         Sets the brush style.
 207
 208         @param style
 209             One of the ::wxBrushStyle values.
 210
 211         @see GetStyle()
 212     */
 213     virtual void SetStyle(wxBrushStyle style);
 214
 215     /**
 216         Inequality operator.
 217         See @ref overview_refcount_equality for more info.
 218     */
 219     bool operator !=(const wxBrush& brush) const;
 220
 221     /**
 222         Equality operator.
 223         See @ref overview_refcount_equality for more info.
 224     */
 225     bool operator ==(const wxBrush& brush) const;
 226 };
 227
 228 /**
 229     An empty brush.
 230     wxBrush::IsOk() always returns @false for this object.
 231 */
 232 wxBrush wxNullBrush;
 233
 234 /**
 235     Blue brush.
 236     Except for the color it has all standard attributes
 237     (@c wxBRUSHSTYLE_SOLID, no stipple bitmap, etc...).
 238 */
 239 wxBrush* wxBLUE_BRUSH;
 240
 241 /**
 242     Green brush.
 243     Except for the color it has all standard attributes
 244     (@c wxBRUSHSTYLE_SOLID, no stipple bitmap, etc...).
 245 */
 246 wxBrush* wxGREEN_BRUSH;
 247
 248 /**
 249     Yellow brush.
 250     Except for the color it has all standard attributes
 251     (@c wxBRUSHSTYLE_SOLID, no stipple bitmap, etc...).
 252 */
 253 wxBrush* wxYELLOW_BRUSH;
 254
 255 /**
 256     White brush.
 257     Except for the color it has all standard attributes
 258     (@c wxBRUSHSTYLE_SOLID, no stipple bitmap, etc...).
 259 */
 260 wxBrush* wxWHITE_BRUSH;
 261
 262 /**
 263     Black brush.
 264     Except for the color it has all standard attributes
 265     (@c wxBRUSHSTYLE_SOLID, no stipple bitmap, etc...).
 266 */
 267 wxBrush* wxBLACK_BRUSH;
 268
 269 /**
 270     Grey brush.
 271     Except for the color it has all standard attributes
 272     (@c wxBRUSHSTYLE_SOLID, no stipple bitmap, etc...).
 273 */
 274 wxBrush* wxGREY_BRUSH;
 275
 276 /**
 277     Medium grey brush.
 278     Except for the color it has all standard attributes
 279     (@c wxBRUSHSTYLE_SOLID, no stipple bitmap, etc...).
 280 */
 281 wxBrush* wxMEDIUM_GREY_BRUSH;
 282
 283 /**
 284     Light grey brush.
 285     Except for the color it has all standard attributes
 286     (@c wxBRUSHSTYLE_SOLID, no stipple bitmap, etc...).
 287 */
 288 wxBrush* wxLIGHT_GREY_BRUSH;
 289
 290 /**
 291     Transparent brush.
 292     Except for the color it has all standard attributes
 293     (@c wxBRUSHSTYLE_SOLID, no stipple bitmap, etc...).
 294 */
 295 wxBrush* wxTRANSPARENT_BRUSH;
 296
 297 /**
 298     Cyan brush.
 299     Except for the color it has all standard attributes
 300     (@c wxBRUSHSTYLE_SOLID, no stipple bitmap, etc...).
 301 */
 302 wxBrush* wxCYAN_BRUSH;
 303
 304 /**
 305     Red brush.
 306     Except for the color it has all standard attributes
 307     (@c wxBRUSHSTYLE_SOLID, no stipple bitmap, etc...).
 308 */
 309 wxBrush* wxRED_BRUSH;
 310
 311
 312
 313 /**
 314     @class wxBrushList
 315
 316     A brush list is a list containing all brushes which have been created.
 317
 318     The application should not construct its own brush list: it should use the
 319     object pointer ::wxTheBrushList.
 320
 321     @library{wxcore}
 322     @category{gdi}
 323
 324     @see wxBrush
 325 */
 326 class wxBrushList : public wxList
 327 {
 328 public:
 329     /**
 330         Finds a brush with the specified attributes and returns it, else creates a new
 331         brush, adds it to the brush list, and returns it.
 332
 333         @param colour
 334             Colour object.
 335         @param style
 336             Brush style. See ::wxBrushStyle for a list of styles.
 337     */
 338     wxBrush* FindOrCreateBrush(const wxColour& colour,
 339                                wxBrushStyle style = wxBRUSHSTYLE_SOLID);
 340 };
 341
 342 /**
 343     The global wxBrushList instance.
 344 */
 345 wxBrushList* wxTheBrushList;