interface/wx/icon.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        icon.h
   3 // Purpose:     interface of wxIcon
   4 // Author:      wxWidgets team
   5 // RCS-ID:      $Id$
   6 // Licence:     wxWindows license
   7 /////////////////////////////////////////////////////////////////////////////
   8
   9
  10
  11 /**
  12     In wxIcon context this value means: "use the screen depth".
  13 */
  14 #define wxICON_SCREEN_DEPTH       (-1)
  15
  16
  17 /**
  18     @class wxIcon
  19
  20     An icon is a small rectangular bitmap usually used for denoting a minimized
  21     application.
  22
  23     It differs from a wxBitmap in always having a mask associated with it for
  24     transparent drawing. On some platforms, icons and bitmaps are implemented
  25     identically, since there is no real distinction between a wxBitmap with a
  26     mask and an icon; and there is no specific icon format on some platforms
  27     (X-based applications usually standardize on XPMs for small bitmaps and icons).
  28     However, some platforms (such as Windows) make the distinction, so a
  29     separate class is provided.
  30
  31     @remarks
  32     It is usually desirable to associate a pertinent icon with a frame.
  33     Icons can also be used for other purposes, for example with wxTreeCtrl and wxListCtrl.
  34     Icons have different formats on different platforms therefore separate icons
  35     will usually be created for the different environments.
  36     Platform-specific methods for creating a wxIcon structure are catered for,
  37     and this is an occasion where conditional compilation will probably be required.
  38     Note that a new icon must be created for every time the icon is to be used
  39     for a new window. In Windows, the icon will not be reloaded if it has already
  40     been used.
  41     An icon allocated to a frame will be deleted when the frame is deleted.
  42     For more information please see @ref overview_bitmap.
  43
  44     @library{wxcore}
  45     @category{gdi}
  46
  47     @stdobjects
  48     ::wxNullIcon
  49
  50     @see @ref overview_bitmap, @ref overview_bitmap_supportedformats,
  51          wxDC::DrawIcon, wxCursor
  52 */
  53 class wxIcon : public wxBitmap
  54 {
  55 public:
  56     /**
  57         Default ctor.
  58
  59         Constructs an icon object with no data; an assignment or another member
  60         function such as LoadFile() must be called subsequently.
  61     */
  62     wxIcon();
  63
  64     /**
  65         Copy ctor.
  66     */
  67     wxIcon(const wxIcon& icon);
  68
  69     /*
  70         Creates an icon from the given data, which can be of arbitrary type.
  71
  72     wxIcon(void* data, int type, int width, int height, int depth = -1);
  73
  74         NOTE: this ctor is not implemented by all ports, is somewhat useless
  75               without further description of the "data" supported formats and
  76               uses 'int type' instead of wxBitmapType, so don't document it.
  77     */
  78
  79     /**
  80         Creates an icon from an array of bits.
  81         You should only use this function for monochrome bitmaps (depth 1) in
  82         portable programs: in this case the bits parameter should contain an XBM image.
  83
  84         For other bit depths, the behaviour is platform dependent: under Windows,
  85         the data is passed without any changes to the underlying CreateBitmap() API.
  86         Under other platforms, only monochrome bitmaps may be created using this
  87         constructor and wxImage should be used for creating colour bitmaps from
  88         static data.
  89
  90         @param bits
  91             Specifies an array of pixel values.
  92         @param width
  93             Specifies the width of the bitmap.
  94         @param height
  95             Specifies the height of the bitmap.
  96         @param depth
  97             Specifies the depth of the bitmap.
  98             If this is omitted, then a value of 1 (monochrome bitmap) is used.
  99     */
 100     wxIcon(const char bits[], int width, int height, int depth = 1);
 101
 102
 103     /**
 104         Creates a new icon. A depth of ::wxICON_SCREEN_DEPTH indicates the
 105         depth of the current screen or visual.
 106
 107         Some platforms only support 1 for monochrome and ::wxICON_SCREEN_DEPTH for
 108         the current colour setting.
 109     */
 110     wxIcon(int width, int height, int depth = wxICON_SCREEN_DEPTH);
 111
 112     /**
 113         Creates a bitmap from XPM data.
 114         To use this constructor, you must first include an XPM file.
 115         For example, assuming that the file mybitmap.xpm contains an XPM array
 116         of character pointers called @e mybitmap:
 117
 118         @code
 119         #include "mybitmap.xpm"
 120         ...
 121         wxIcon *icon = new wxIcon(mybitmap);
 122         @endcode
 123
 124         A macro, wxICON, is available which creates an icon using an XPM on
 125         the appropriate platform, or an icon resource on Windows.
 126
 127         @code
 128         wxIcon icon(wxICON(mondrian));
 129
 130         // Equivalent to:
 131         #if defined(__WXGTK__) || defined(__WXMOTIF__)
 132         wxIcon icon(mondrian_xpm);
 133         #endif
 134
 135         #if defined(__WXMSW__)
 136         wxIcon icon("mondrian");
 137         #endif
 138         @endcode
 139     */
 140     wxIcon(const char* const* bits);
 141
 142     /**
 143         Loads an icon from a file or resource.
 144
 145         @param name
 146             This can refer to a resource name or a filename under MS Windows and X.
 147             Its meaning is determined by the @a type parameter.
 148         @param type
 149             May be one of the ::wxBitmapType values and indicates which type of
 150             bitmap should be loaded. See the note in the class detailed description.
 151             Note that the wxICON_DEFAULT_TYPE constant has different value under
 152             different wxWidgets ports. See the icon.h header for the value it takes
 153             for a specific port.
 154         @param desiredWidth
 155             Specifies the desired width of the icon. This parameter only has
 156             an effect in Windows where icon resources can contain several icons
 157             of different sizes.
 158         @param desiredHeight
 159             Specifies the desired height of the icon. This parameter only has
 160             an effect in Windows where icon resources can contain several icons
 161             of different sizes.
 162
 163         @see LoadFile()
 164     */
 165     wxIcon(const wxString& name, wxBitmapType type = wxICON_DEFAULT_TYPE,
 166            int desiredWidth = -1, int desiredHeight = -1);
 167
 168     /**
 169         Loads an icon from the specified location.
 170     */
 171     wxIcon(const wxIconLocation& loc);
 172
 173     /**
 174         Destructor.
 175         See @ref overview_refcount_destruct for more info.
 176
 177         If the application omits to delete the icon explicitly, the icon will be
 178         destroyed automatically by wxWidgets when the application exits.
 179
 180         @warning
 181         Do not delete an icon that is selected into a memory device context.
 182     */
 183     virtual ~wxIcon();
 184
 185     /**
 186         Copies @a bmp bitmap to this icon.
 187         Under MS Windows the bitmap must have mask colour set.
 188
 189         @see LoadFile()
 190     */
 191     void CopyFromBitmap(const wxBitmap& bmp);
 192
 193     /**
 194         Gets the colour depth of the icon.
 195         A value of 1 indicates a monochrome icon.
 196     */
 197     int GetDepth() const;
 198
 199     /**
 200         Gets the height of the icon in pixels.
 201
 202         @see GetWidth()
 203     */
 204     int GetHeight() const;
 205
 206     /**
 207         Gets the width of the icon in pixels.
 208
 209         @see GetHeight()
 210     */
 211     int GetWidth() const;
 212
 213     /**
 214         Returns @true if icon data is present.
 215     */
 216     virtual bool IsOk() const;
 217
 218     /**
 219         Loads an icon from a file or resource.
 220
 221         @param name
 222             Either a filename or a Windows resource name.
 223             The meaning of name is determined by the @a type parameter.
 224         @param type
 225             One of the ::wxBitmapType values; see the note in the class
 226             detailed description.
 227             Note that the wxICON_DEFAULT_TYPE constant has different value under
 228             different wxWidgets ports. See the icon.h header for the value it takes
 229             for a specific port.
 230         @param desiredWidth
 231             Specifies the desired width of the icon. This parameter only has
 232             an effect in Windows where icon resources can contain several icons
 233             of different sizes.
 234         @param desiredHeight
 235             Specifies the desired height of the icon. This parameter only has
 236             an effect in Windows where icon resources can contain several icons
 237             of different sizes.
 238
 239         @return @true if the operation succeeded, @false otherwise.
 240     */
 241     bool LoadFile(const wxString& name, wxBitmapType type = wxICON_DEFAULT_TYPE,
 242                   int desiredWidth = -1, int desiredHeight = -1);
 243
 244     /**
 245         Sets the depth member (does not affect the icon data).
 246
 247         @param depth
 248             Icon depth.
 249     */
 250     void SetDepth(int depth);
 251
 252     /**
 253         Sets the height member (does not affect the icon data).
 254
 255         @param height
 256             Icon height in pixels.
 257     */
 258     void SetHeight(int height);
 259
 260     /**
 261         Sets the width member (does not affect the icon data).
 262
 263         @param width
 264             Icon width in pixels.
 265     */
 266     void SetWidth(int width);
 267
 268     /**
 269         Assignment operator, using @ref overview_refcount.
 270
 271         @param icon
 272             Icon to assign.
 273     */
 274     wxIcon operator =(const wxIcon& icon);
 275 };
 276
 277 /**
 278     An empty wxIcon.
 279 */
 280 wxIcon wxNullIcon;
 281
 282