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 licence
   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 wxGDIObject
  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         @beginWxPerlOnly
  98         In wxPerl use Wx::Icon->newBits(bits, width, height, depth = -1);
  99         @endWxPerlOnly
 100
 101         @onlyfor{wxmsw,wxosx}
 102     */
 103     wxIcon(const char bits[], int width, int height);
 104
 105     /**
 106         Creates a bitmap from XPM data.
 107         To use this constructor, you must first include an XPM file.
 108         For example, assuming that the file mybitmap.xpm contains an XPM array
 109         of character pointers called @e mybitmap:
 110
 111         @code
 112         #include "mybitmap.xpm"
 113         ...
 114         wxIcon *icon = new wxIcon(mybitmap);
 115         @endcode
 116
 117         A macro, wxICON, is available which creates an icon using an XPM on
 118         the appropriate platform, or an icon resource on Windows.
 119
 120         @code
 121         wxIcon icon(wxICON(sample));
 122
 123         // Equivalent to:
 124         #if defined(__WXGTK__) || defined(__WXMOTIF__)
 125         wxIcon icon(sample_xpm);
 126         #endif
 127
 128         #if defined(__WXMSW__)
 129         wxIcon icon("sample");
 130         #endif
 131         @endcode
 132
 133         @beginWxPerlOnly
 134         In wxPerl use Wx::Icon->newFromXPM(data).
 135         @endWxPerlOnly
 136     */
 137     wxIcon(const char* const* bits);
 138
 139     /**
 140         Loads an icon from a file or resource.
 141
 142         @param name
 143             This can refer to a resource name or a filename under MS Windows and X.
 144             Its meaning is determined by the @a type parameter.
 145         @param type
 146             May be one of the ::wxBitmapType values and indicates which type of
 147             bitmap should be loaded. See the note in the class detailed description.
 148             Note that the wxICON_DEFAULT_TYPE constant has different value under
 149             different wxWidgets ports. See the icon.h header for the value it takes
 150             for a specific port.
 151         @param desiredWidth
 152             Specifies the desired width of the icon. This parameter only has
 153             an effect in Windows where icon resources can contain several icons
 154             of different sizes.
 155         @param desiredHeight
 156             Specifies the desired height of the icon. This parameter only has
 157             an effect in Windows where icon resources can contain several icons
 158             of different sizes.
 159
 160         @see LoadFile()
 161     */
 162     wxIcon(const wxString& name, wxBitmapType type = wxICON_DEFAULT_TYPE,
 163            int desiredWidth = -1, int desiredHeight = -1);
 164
 165     /**
 166         Loads an icon from the specified location.
 167     */
 168     wxIcon(const wxIconLocation& loc);
 169
 170     /**
 171         Destructor.
 172         See @ref overview_refcount_destruct for more info.
 173
 174         If the application omits to delete the icon explicitly, the icon will be
 175         destroyed automatically by wxWidgets when the application exits.
 176
 177         @warning
 178         Do not delete an icon that is selected into a memory device context.
 179     */
 180     virtual ~wxIcon();
 181
 182     /**
 183         Returns disabled (dimmed) version of the icon. MSW only.
 184         @since 2.9.0
 185     */
 186     wxIcon ConvertToDisabled(unsigned char brightness = 255) const;
 187
 188     /**
 189         Copies @a bmp bitmap to this icon.
 190         Under MS Windows the bitmap must have mask colour set.
 191
 192         @see LoadFile()
 193     */
 194     void CopyFromBitmap(const wxBitmap& bmp);
 195
 196     /**
 197         Gets the colour depth of the icon.
 198         A value of 1 indicates a monochrome icon.
 199     */
 200     int GetDepth() const;
 201
 202     /**
 203         Gets the height of the icon in pixels.
 204
 205         @see GetWidth()
 206     */
 207     int GetHeight() const;
 208
 209     /**
 210         Gets the width of the icon in pixels.
 211
 212         @see GetHeight()
 213     */
 214     int GetWidth() const;
 215
 216     /**
 217         Returns @true if icon data is present.
 218     */
 219     virtual bool IsOk() const;
 220
 221     /**
 222         Loads an icon from a file or resource.
 223
 224         @param name
 225             Either a filename or a Windows resource name.
 226             The meaning of name is determined by the @a type parameter.
 227         @param type
 228             One of the ::wxBitmapType values; see the note in the class
 229             detailed description.
 230             Note that the wxICON_DEFAULT_TYPE constant has different value under
 231             different wxWidgets ports. See the icon.h header for the value it takes
 232             for a specific port.
 233         @param desiredWidth
 234             Specifies the desired width of the icon. This parameter only has
 235             an effect in Windows where icon resources can contain several icons
 236             of different sizes.
 237         @param desiredHeight
 238             Specifies the desired height of the icon. This parameter only has
 239             an effect in Windows where icon resources can contain several icons
 240             of different sizes.
 241
 242         @return @true if the operation succeeded, @false otherwise.
 243     */
 244     bool LoadFile(const wxString& name, wxBitmapType type = wxICON_DEFAULT_TYPE,
 245                   int desiredWidth = -1, int desiredHeight = -1);
 246
 247     /**
 248         Sets the depth member (does not affect the icon data).
 249
 250         @param depth
 251             Icon depth.
 252     */
 253     void SetDepth(int depth);
 254
 255     /**
 256         Sets the height member (does not affect the icon data).
 257
 258         @param height
 259             Icon height in pixels.
 260     */
 261     void SetHeight(int height);
 262
 263     /**
 264         Sets the width member (does not affect the icon data).
 265
 266         @param width
 267             Icon width in pixels.
 268     */
 269     void SetWidth(int width);
 270
 271     /**
 272         Assignment operator, using @ref overview_refcount.
 273
 274         @param icon
 275             Icon to assign.
 276     */
 277     wxIcon& operator=(const wxIcon& icon);
 278 };
 279
 280 /**
 281     An empty wxIcon.
 282 */
 283 wxIcon wxNullIcon;
 284
 285