interface/wx/cursor.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        cursor.h
   3 // Purpose:     interface of wxCursor
   4 // Author:      wxWidgets team
   5 // RCS-ID:      $Id$
   6 // Licence:     wxWindows licence
   7 /////////////////////////////////////////////////////////////////////////////
   8
   9 /**
  10     @class wxCursor
  11
  12     A cursor is a small bitmap usually used for denoting where the mouse
  13     pointer is, with a picture that might indicate the interpretation of a
  14     mouse click. As with icons, cursors in X and MS Windows are created in a
  15     different manner. Therefore, separate cursors will be created for the
  16     different environments. Platform-specific methods for creating a wxCursor
  17     object are catered for, and this is an occasion where conditional
  18     compilation will probably be required (see wxIcon for an example).
  19
  20     A single cursor object may be used in many windows (any subwindow type).
  21     The wxWidgets convention is to set the cursor for a window, as in X, rather
  22     than to set it globally as in MS Windows, although a global wxSetCursor()
  23     function is also available for MS Windows use.
  24
  25     @section cursor_custom Creating a Custom Cursor
  26
  27     The following is an example of creating a cursor from 32x32 bitmap data
  28     (down_bits) and a mask (down_mask) where 1 is black and 0 is white for the
  29     bits, and 1 is opaque and 0 is transparent for the mask.
  30     It works on Windows and GTK+.
  31
  32     @code
  33     static char down_bits[] = { 255, 255, 255, 255, 31,
  34         255, 255, 255, 31, 255, 255, 255, 31, 255, 255, 255,
  35         31, 255, 255, 255, 31, 255, 255, 255, 31, 255, 255,
  36         255, 31, 255, 255, 255, 31, 255, 255, 255, 25, 243,
  37         255, 255, 19, 249, 255, 255, 7, 252, 255, 255, 15, 254,
  38         255, 255, 31, 255, 255, 255, 191, 255, 255, 255, 255,
  39         255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
  40         255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
  41         255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
  42         255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
  43         255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
  44         255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
  45         255 };
  46
  47     static char down_mask[] = { 240, 1, 0, 0, 240, 1,
  48         0, 0, 240, 1, 0, 0, 240, 1, 0, 0, 240, 1, 0, 0, 240, 1,
  49         0, 0, 240, 1, 0, 0, 240, 1, 0, 0, 255, 31, 0, 0, 255,
  50         31, 0, 0, 254, 15, 0, 0, 252, 7, 0, 0, 248, 3, 0, 0,
  51         240, 1, 0, 0, 224, 0, 0, 0, 64, 0, 0, 0, 0, 0, 0, 0, 0,
  52         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  53         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  54         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  55         0, 0, 0, 0, 0 };
  56
  57     #ifdef __WXMSW__
  58         wxBitmap down_bitmap(down_bits, 32, 32);
  59         wxBitmap down_mask_bitmap(down_mask, 32, 32);
  60
  61         down_bitmap.SetMask(new wxMask(down_mask_bitmap));
  62         wxImage down_image = down_bitmap.ConvertToImage();
  63         down_image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X, 6);
  64         down_image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y, 14);
  65         wxCursor down_cursor = wxCursor(down_image);
  66     #elif defined(__WXGTK__) or defined(__WXMOTIF__)
  67         wxCursor down_cursor = wxCursor(down_bits, 32, 32, 6, 14,
  68                                         down_mask, wxWHITE, wxBLACK);
  69     #endif
  70     @endcode
  71
  72     @library{wxcore}
  73     @category{gdi}
  74
  75     @stdobjects
  76     - ::wxNullCursor
  77     - ::wxSTANDARD_CURSOR
  78     - ::wxHOURGLASS_CURSOR
  79     - ::wxCROSS_CURSOR
  80
  81     @see wxBitmap, wxIcon, wxWindow::SetCursor(), wxSetCursor(), ::wxStockCursor
  82 */
  83 class wxCursor : public wxGDIObject
  84 {
  85 public:
  86     /**
  87         Default constructor.
  88     */
  89     wxCursor();
  90
  91     /**
  92         Constructs a cursor by passing an array of bits (XBM data).
  93
  94         The parameters @a fg and @a bg have an effect only on GTK+, and force
  95         the cursor to use particular background and foreground colours.
  96
  97         If either @a hotSpotX or @a hotSpotY is -1, the hotspot will be the
  98         centre of the cursor image (Motif only).
  99
 100         @param bits
 101             An array of XBM data bits.
 102         @param width
 103             Cursor width.
 104         @param height
 105             Cursor height.
 106         @param hotSpotX
 107             Hotspot x coordinate (relative to the top left of the image).
 108         @param hotSpotY
 109             Hotspot y coordinate (relative to the top left of the image).
 110         @param maskBits
 111             Bits for a mask bitmap.
 112
 113         @onlyfor{wxgtk,wxmotif}
 114
 115         @beginWxPerlOnly
 116         In wxPerl use Wx::Cursor->newData(bits, width, height, hotSpotX = -1, hotSpotY = -1, maskBits = 0).
 117         @endWxPerlOnly
 118     */
 119     wxCursor(const char bits[], int width, int height,
 120              int hotSpotX = -1, int hotSpotY = -1,
 121              const char maskBits[] = NULL);
 122
 123     /**
 124         Constructs a cursor by passing a string resource name or filename.
 125
 126         The arguments @a hotSpotX and @a hotSpotY are only used when there's no
 127         hotspot info in the resource/image-file to load (e.g. when using
 128         @c wxBITMAP_TYPE_ICO under wxMSW or @c wxBITMAP_TYPE_XPM under wxGTK).
 129
 130         @param cursorName
 131             The name of the resource or the image file to load.
 132         @param type
 133             Icon type to load. It defaults to @c wxCURSOR_DEFAULT_TYPE,
 134             which is a @#define associated to different values on different
 135             platforms:
 136             - under Windows, it defaults to @c wxBITMAP_TYPE_CUR_RESOURCE.
 137               Other permitted types under Windows are @c wxBITMAP_TYPE_CUR
 138               (to load a cursor from a .cur cursor file) and @c wxBITMAP_TYPE_ICO
 139               (to load a cursor from a .ico icon file).
 140             - under MacOS, it defaults to @c wxBITMAP_TYPE_MACCURSOR_RESOURCE;
 141               when specifying a string resource name, first the color cursors 'crsr'
 142               and then the black/white cursors 'CURS' in the resource chain are scanned
 143               through. Note that resource forks are deprecated on OS X so this
 144               is only available for legacy reasons and should not be used in
 145               new code.
 146             - under GTK, it defaults to @c wxBITMAP_TYPE_XPM.
 147               See the wxCursor(const wxImage& image) ctor for more info.
 148             - under X11, it defaults to @c wxBITMAP_TYPE_XPM.
 149             - under Motif, it defaults to @c wxBITMAP_TYPE_XBM.
 150         @param hotSpotX
 151             Hotspot x coordinate (relative to the top left of the image).
 152         @param hotSpotY
 153             Hotspot y coordinate (relative to the top left of the image).
 154     */
 155     wxCursor(const wxString& cursorName,
 156              wxBitmapType type = wxCURSOR_DEFAULT_TYPE,
 157              int hotSpotX = 0, int hotSpotY = 0);
 158
 159     /**
 160         Constructs a cursor using a cursor identifier.
 161
 162         @param cursorId
 163             A stock cursor identifier. See ::wxStockCursor.
 164     */
 165     wxCursor(wxStockCursor cursorId);
 166
 167     /**
 168         Constructs a cursor from a wxImage. If cursor are monochrome on the
 169         current platform, colors with the RGB elements all greater than 127
 170         will be foreground, colors less than this background. The mask (if any)
 171         will be used to specify the transparent area.
 172
 173         In wxMSW the foreground will be white and the background black.
 174         If the cursor is larger than 32x32 it is resized.
 175
 176         In wxGTK, colour cursors and alpha channel are supported (starting from
 177         GTK+ 2.2). Otherwise the two most frequent colors will be used for
 178         foreground and background. In any case, the cursor will be displayed
 179         at the size of the image.
 180
 181         In wxMac, if the cursor is larger than 16x16 it is resized and
 182         currently only shown as black/white (mask respected).
 183     */
 184     wxCursor(const wxImage& image);
 185
 186     /**
 187         Copy constructor, uses @ref overview_refcount "reference counting".
 188
 189         @param cursor
 190             Pointer or reference to a cursor to copy.
 191     */
 192     wxCursor(const wxCursor& cursor);
 193
 194     /**
 195         Destroys the cursor. See
 196         @ref overview_refcount_destruct "reference-counted object destruction"
 197         for more info.
 198
 199         A cursor can be reused for more than one window, and does not get
 200         destroyed when the window is destroyed. wxWidgets destroys all cursors
 201         on application exit, although it is best to clean them up explicitly.
 202     */
 203     virtual ~wxCursor();
 204
 205     /**
 206         Returns @true if cursor data is present.
 207     */
 208     virtual bool IsOk() const;
 209
 210     /**
 211         Assignment operator, using @ref overview_refcount "reference counting".
 212     */
 213     wxCursor& operator =(const wxCursor& cursor);
 214 };
 215
 216
 217 /**
 218     @name Predefined cursors.
 219
 220     @see wxStockCursor
 221 */
 222 //@{
 223 wxCursor wxNullCursor;
 224 wxCursor* wxSTANDARD_CURSOR;
 225 wxCursor* wxHOURGLASS_CURSOR;
 226 wxCursor* wxCROSS_CURSOR;
 227 //@}
 228