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         Attach a Windows icon handle.
 184
 185         This wxMSW-specific method allows to assign a native Windows @c HICON
 186         (which must be castes to @c WXHICON opaque handle type) to wxIcon.
 187         Notice that this means that the @c HICON will be destroyed by wxIcon
 188         when it is destroyed.
 189
 190         @return @true if successful.
 191
 192         @onlyfor{wxmsw}
 193
 194         @since 2.9.5
 195     */
 196     bool CreateFromHICON(WXHICON icon);
 197
 198     /**
 199         Returns disabled (dimmed) version of the icon.
 200
 201         This method is available in wxIcon only under wxMSW, other ports only
 202         have it in wxBitmap. You can always use wxImage::ConvertToDisabled()
 203         and create the icon from wxImage manually however.
 204
 205         @onlyfor{wxmsw}
 206
 207         @since 2.9.0
 208     */
 209     wxIcon ConvertToDisabled(unsigned char brightness = 255) const;
 210
 211     /**
 212         Copies @a bmp bitmap to this icon.
 213         Under MS Windows the bitmap must have mask colour set.
 214
 215         @see LoadFile()
 216     */
 217     void CopyFromBitmap(const wxBitmap& bmp);
 218
 219     /**
 220         Gets the colour depth of the icon.
 221         A value of 1 indicates a monochrome icon.
 222     */
 223     int GetDepth() const;
 224
 225     /**
 226         Gets the height of the icon in pixels.
 227
 228         @see GetWidth()
 229     */
 230     int GetHeight() const;
 231
 232     /**
 233         Gets the width of the icon in pixels.
 234
 235         @see GetHeight()
 236     */
 237     int GetWidth() const;
 238
 239     /**
 240         Returns @true if icon data is present.
 241     */
 242     virtual bool IsOk() const;
 243
 244     /**
 245         Loads an icon from a file or resource.
 246
 247         @param name
 248             Either a filename or a Windows resource name.
 249             The meaning of name is determined by the @a type parameter.
 250         @param type
 251             One of the ::wxBitmapType values; see the note in the class
 252             detailed description.
 253             Note that the wxICON_DEFAULT_TYPE constant has different value under
 254             different wxWidgets ports. See the icon.h header for the value it takes
 255             for a specific port.
 256         @param desiredWidth
 257             Specifies the desired width of the icon. This parameter only has
 258             an effect in Windows where icon resources can contain several icons
 259             of different sizes.
 260         @param desiredHeight
 261             Specifies the desired height of the icon. This parameter only has
 262             an effect in Windows where icon resources can contain several icons
 263             of different sizes.
 264
 265         @return @true if the operation succeeded, @false otherwise.
 266     */
 267     bool LoadFile(const wxString& name, wxBitmapType type = wxICON_DEFAULT_TYPE,
 268                   int desiredWidth = -1, int desiredHeight = -1);
 269
 270     /**
 271         Sets the depth member (does not affect the icon data).
 272
 273         @param depth
 274             Icon depth.
 275     */
 276     void SetDepth(int depth);
 277
 278     /**
 279         Sets the height member (does not affect the icon data).
 280
 281         @param height
 282             Icon height in pixels.
 283     */
 284     void SetHeight(int height);
 285
 286     /**
 287         Sets the width member (does not affect the icon data).
 288
 289         @param width
 290             Icon width in pixels.
 291     */
 292     void SetWidth(int width);
 293
 294     /**
 295         Assignment operator, using @ref overview_refcount.
 296
 297         @param icon
 298             Icon to assign.
 299     */
 300     wxIcon& operator=(const wxIcon& icon);
 301 };
 302
 303 /**
 304     An empty wxIcon.
 305 */
 306 wxIcon wxNullIcon;
 307
 308