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 license
   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.
 108         @param hotSpotY
 109             Hotspot y coordinate.
 110         @param maskBits
 111             Bits for a mask bitmap.
 112
 113         @onlyfor{wxgtk,wxmotif}
 114     */
 115     wxCursor(const char bits[], int width, int height,
 116              int hotSpotX = -1, int hotSpotY = -1,
 117              const char maskBits[] = NULL);
 118
 119     /**
 120         Constructs a cursor by passing a string resource name or filename.
 121
 122         @note
 123         On MacOS when specifying a string resource name, first the color
 124         cursors 'crsr' and then the black/white cursors 'CURS' in the resource
 125         chain are scanned through.
 126
 127         @a hotSpotX and @a hotSpotY are currently only used under Windows when
 128         loading from an icon file, to specify the cursor hotspot relative to
 129         the top left of the image.
 130
 131         @param cursorName
 132             The name of the resource or the image file to load.
 133         @param type
 134             Icon type to load. It defaults to wxCURSOR_DEFAULT_TYPE,
 135             which is a @#define associated to different values on different
 136             platforms:
 137             - under Windows, it defaults to wxBITMAP_TYPE_CUR_RESOURCE.
 138             - under MacOS, it defaults to wxBITMAP_TYPE_MACCURSOR_RESOURCE.
 139             - under GTK, it defaults to wxBITMAP_TYPE_XPM.
 140             - under X11, it defaults to wxBITMAP_TYPE_XPM.
 141             - under Motif, type defaults to wxBITMAP_TYPE_XBM.
 142             Under Windows, the permitted types are:
 143             - wxBITMAP_TYPE_CUR - Load a cursor from a .cur cursor file (only
 144                                   if USE_RESOURCE_LOADING_IN_MSW is enabled in
 145                                   setup.h).
 146             - wxBITMAP_TYPE_CUR_RESOURCE - Load a Windows resource
 147                                            (as specified in the .rc file).
 148             - wxBITMAP_TYPE_ICO - Load a cursor from a .ico icon file (only if
 149                                   USE_RESOURCE_LOADING_IN_MSW is enabled in
 150                                   setup.h). Specify @a hotSpotX and @a hotSpotY.
 151         @param hotSpotX
 152             Hotspot x coordinate.
 153         @param hotSpotY
 154             Hotspot y coordinate.
 155     */
 156     wxCursor(const wxString& cursorName,
 157              wxBitmapType type = wxCURSOR_DEFAULT_TYPE,
 158              int hotSpotX = 0, int hotSpotY = 0);
 159
 160     /**
 161         Constructs a cursor using a cursor identifier.
 162
 163         @param cursorId
 164             A stock cursor identifier. See ::wxStockCursor.
 165     */
 166     wxCursor(wxStockCursor cursorId);
 167
 168     /**
 169         Constructs a cursor from a wxImage. If cursor are monochrome on the
 170         current platform, colors with the RGB elements all greater than 127
 171         will be foreground, colors less than this background. The mask (if any)
 172         will be used to specify the transparent area.
 173
 174         In wxMSW the foreground will be white and the background black.
 175         If the cursor is larger than 32x32 it is resized.
 176
 177         In wxGTK, colour cursors and alpha channel are supported (starting from
 178         GTK+ 2.2). Otherwise the two most frequent colors will be used for
 179         foreground and background. In any case, the cursor will be displayed
 180         at the size of the image.
 181
 182         In wxMac, if the cursor is larger than 16x16 it is resized and
 183         currently only shown as black/white (mask respected).
 184     */
 185     wxCursor(const wxImage& image);
 186
 187     /**
 188         Copy constructor, uses @ref overview_refcount "reference counting".
 189
 190         @param cursor
 191             Pointer or reference to a cursor to copy.
 192     */
 193     wxCursor(const wxCursor& cursor);
 194
 195     /**
 196         Destroys the cursor. See
 197         @ref overview_refcount_destruct "reference-counted object destruction"
 198         for more info.
 199
 200         A cursor can be reused for more than one window, and does not get
 201         destroyed when the window is destroyed. wxWidgets destroys all cursors
 202         on application exit, although it is best to clean them up explicitly.
 203     */
 204     virtual ~wxCursor();
 205
 206     /**
 207         Returns @true if cursor data is present.
 208     */
 209     virtual bool IsOk() const;
 210
 211     /**
 212         Assignment operator, using @ref overview_refcount "reference counting".
 213     */
 214     wxCursor& operator =(const wxCursor& cursor);
 215 };
 216
 217
 218 /**
 219     @name Predefined cursors.
 220
 221     @see wxStockCursor
 222 */
 223 //@{
 224 wxCursor wxNullCursor;
 225 wxCursor* wxSTANDARD_CURSOR;
 226 wxCursor* wxHOURGLASS_CURSOR;
 227 wxCursor* wxCROSS_CURSOR;
 228 //@}
 229