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.
 144             - under GTK, it defaults to @c wxBITMAP_TYPE_XPM.
 145               See the wxCursor(const wxImage& image) ctor for more info.
 146             - under X11, it defaults to @c wxBITMAP_TYPE_XPM.
 147             - under Motif, it defaults to @c wxBITMAP_TYPE_XBM.
 148         @param hotSpotX
 149             Hotspot x coordinate (relative to the top left of the image).
 150         @param hotSpotY
 151             Hotspot y coordinate (relative to the top left of the image).
 152     */
 153     wxCursor(const wxString& cursorName,
 154              wxBitmapType type = wxCURSOR_DEFAULT_TYPE,
 155              int hotSpotX = 0, int hotSpotY = 0);
 156
 157     /**
 158         Constructs a cursor using a cursor identifier.
 159
 160         @param cursorId
 161             A stock cursor identifier. See ::wxStockCursor.
 162     */
 163     wxCursor(wxStockCursor cursorId);
 164
 165     /**
 166         Constructs a cursor from a wxImage. If cursor are monochrome on the
 167         current platform, colors with the RGB elements all greater than 127
 168         will be foreground, colors less than this background. The mask (if any)
 169         will be used to specify the transparent area.
 170
 171         In wxMSW the foreground will be white and the background black.
 172         If the cursor is larger than 32x32 it is resized.
 173
 174         In wxGTK, colour cursors and alpha channel are supported (starting from
 175         GTK+ 2.2). Otherwise the two most frequent colors will be used for
 176         foreground and background. In any case, the cursor will be displayed
 177         at the size of the image.
 178
 179         In wxMac, if the cursor is larger than 16x16 it is resized and
 180         currently only shown as black/white (mask respected).
 181     */
 182     wxCursor(const wxImage& image);
 183
 184     /**
 185         Copy constructor, uses @ref overview_refcount "reference counting".
 186
 187         @param cursor
 188             Pointer or reference to a cursor to copy.
 189     */
 190     wxCursor(const wxCursor& cursor);
 191
 192     /**
 193         Destroys the cursor. See
 194         @ref overview_refcount_destruct "reference-counted object destruction"
 195         for more info.
 196
 197         A cursor can be reused for more than one window, and does not get
 198         destroyed when the window is destroyed. wxWidgets destroys all cursors
 199         on application exit, although it is best to clean them up explicitly.
 200     */
 201     virtual ~wxCursor();
 202
 203     /**
 204         Returns @true if cursor data is present.
 205     */
 206     virtual bool IsOk() const;
 207
 208     /**
 209         Assignment operator, using @ref overview_refcount "reference counting".
 210     */
 211     wxCursor& operator =(const wxCursor& cursor);
 212 };
 213
 214
 215 /**
 216     @name Predefined cursors.
 217
 218     @see wxStockCursor
 219 */
 220 //@{
 221 wxCursor wxNullCursor;
 222 wxCursor* wxSTANDARD_CURSOR;
 223 wxCursor* wxHOURGLASS_CURSOR;
 224 wxCursor* wxCROSS_CURSOR;
 225 //@}
 226