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             The width of the image.
  94         @param height
  95             The height of the image.
  96
  97         @onlyfor{wxmsw,wxmac}
  98     */
  99     wxIcon(const char bits[], int width, int height);
 100
 101     /**
 102         Creates a bitmap from XPM data.
 103         To use this constructor, you must first include an XPM file.
 104         For example, assuming that the file mybitmap.xpm contains an XPM array
 105         of character pointers called @e mybitmap:
 106
 107         @code
 108         #include "mybitmap.xpm"
 109         ...
 110         wxIcon *icon = new wxIcon(mybitmap);
 111         @endcode
 112
 113         A macro, wxICON, is available which creates an icon using an XPM on
 114         the appropriate platform, or an icon resource on Windows.
 115
 116         @code
 117         wxIcon icon(wxICON(mondrian));
 118
 119         // Equivalent to:
 120         #if defined(__WXGTK__) || defined(__WXMOTIF__)
 121         wxIcon icon(mondrian_xpm);
 122         #endif
 123
 124         #if defined(__WXMSW__)
 125         wxIcon icon("mondrian");
 126         #endif
 127         @endcode
 128     */
 129     wxIcon(const char* const* bits);
 130
 131     /**
 132         Loads an icon from a file or resource.
 133
 134         @param name
 135             This can refer to a resource name or a filename under MS Windows and X.
 136             Its meaning is determined by the @a type parameter.
 137         @param type
 138             May be one of the ::wxBitmapType values and indicates which type of
 139             bitmap should be loaded. See the note in the class detailed description.
 140             Note that the wxICON_DEFAULT_TYPE constant has different value under
 141             different wxWidgets ports. See the icon.h header for the value it takes
 142             for a specific port.
 143         @param desiredWidth
 144             Specifies the desired width of the icon. This parameter only has
 145             an effect in Windows where icon resources can contain several icons
 146             of different sizes.
 147         @param desiredHeight
 148             Specifies the desired height of the icon. This parameter only has
 149             an effect in Windows where icon resources can contain several icons
 150             of different sizes.
 151
 152         @see LoadFile()
 153     */
 154     wxIcon(const wxString& name, wxBitmapType type = wxICON_DEFAULT_TYPE,
 155            int desiredWidth = -1, int desiredHeight = -1);
 156
 157     /**
 158         Loads an icon from the specified location.
 159     */
 160     wxIcon(const wxIconLocation& loc);
 161
 162     /**
 163         Destructor.
 164         See @ref overview_refcount_destruct for more info.
 165
 166         If the application omits to delete the icon explicitly, the icon will be
 167         destroyed automatically by wxWidgets when the application exits.
 168
 169         @warning
 170         Do not delete an icon that is selected into a memory device context.
 171     */
 172     virtual ~wxIcon();
 173
 174     /**
 175         Copies @a bmp bitmap to this icon.
 176         Under MS Windows the bitmap must have mask colour set.
 177
 178         @see LoadFile()
 179     */
 180     void CopyFromBitmap(const wxBitmap& bmp);
 181
 182     /**
 183         Gets the colour depth of the icon.
 184         A value of 1 indicates a monochrome icon.
 185     */
 186     int GetDepth() const;
 187
 188     /**
 189         Gets the height of the icon in pixels.
 190
 191         @see GetWidth()
 192     */
 193     int GetHeight() const;
 194
 195     /**
 196         Gets the width of the icon in pixels.
 197
 198         @see GetHeight()
 199     */
 200     int GetWidth() const;
 201
 202     /**
 203         Returns @true if icon data is present.
 204     */
 205     virtual bool IsOk() const;
 206
 207     /**
 208         Loads an icon from a file or resource.
 209
 210         @param name
 211             Either a filename or a Windows resource name.
 212             The meaning of name is determined by the @a type parameter.
 213         @param type
 214             One of the ::wxBitmapType values; see the note in the class
 215             detailed description.
 216             Note that the wxICON_DEFAULT_TYPE constant has different value under
 217             different wxWidgets ports. See the icon.h header for the value it takes
 218             for a specific port.
 219         @param desiredWidth
 220             Specifies the desired width of the icon. This parameter only has
 221             an effect in Windows where icon resources can contain several icons
 222             of different sizes.
 223         @param desiredHeight
 224             Specifies the desired height of the icon. This parameter only has
 225             an effect in Windows where icon resources can contain several icons
 226             of different sizes.
 227
 228         @return @true if the operation succeeded, @false otherwise.
 229     */
 230     bool LoadFile(const wxString& name, wxBitmapType type = wxICON_DEFAULT_TYPE,
 231                   int desiredWidth = -1, int desiredHeight = -1);
 232
 233     /**
 234         Sets the depth member (does not affect the icon data).
 235
 236         @param depth
 237             Icon depth.
 238     */
 239     void SetDepth(int depth);
 240
 241     /**
 242         Sets the height member (does not affect the icon data).
 243
 244         @param height
 245             Icon height in pixels.
 246     */
 247     void SetHeight(int height);
 248
 249     /**
 250         Sets the width member (does not affect the icon data).
 251
 252         @param width
 253             Icon width in pixels.
 254     */
 255     void SetWidth(int width);
 256
 257     /**
 258         Assignment operator, using @ref overview_refcount.
 259
 260         @param icon
 261             Icon to assign.
 262     */
 263     wxIcon& operator=(const wxIcon& icon);
 264 };
 265
 266 /**
 267     An empty wxIcon.
 268 */
 269 wxIcon wxNullIcon;
 270
 271