interface/wx/cursor.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        cursor.h
   3 // Purpose:     interface of wxCursor
   4 // Author:      wxWidgets team
   5 // Licence:     wxWindows licence
   6 /////////////////////////////////////////////////////////////////////////////
   7
   8 /**
   9     @class wxCursor
  10
  11     A cursor is a small bitmap usually used for denoting where the mouse
  12     pointer is, with a picture that might indicate the interpretation of a
  13     mouse click. As with icons, cursors in X and MS Windows are created in a
  14     different manner. Therefore, separate cursors will be created for the
  15     different environments. Platform-specific methods for creating a wxCursor
  16     object are catered for, and this is an occasion where conditional
  17     compilation will probably be required (see wxIcon for an example).
  18
  19     A single cursor object may be used in many windows (any subwindow type).
  20     The wxWidgets convention is to set the cursor for a window, as in X, rather
  21     than to set it globally as in MS Windows, although a global wxSetCursor()
  22     function is also available for MS Windows use.
  23
  24     @section cursor_custom Creating a Custom Cursor
  25
  26     The following is an example of creating a cursor from 32x32 bitmap data
  27     (down_bits) and a mask (down_mask) where 1 is black and 0 is white for the
  28     bits, and 1 is opaque and 0 is transparent for the mask.
  29     It works on Windows and GTK+.
  30
  31     @code
  32     static char down_bits[] = { 255, 255, 255, 255, 31,
  33         255, 255, 255, 31, 255, 255, 255, 31, 255, 255, 255,
  34         31, 255, 255, 255, 31, 255, 255, 255, 31, 255, 255,
  35         255, 31, 255, 255, 255, 31, 255, 255, 255, 25, 243,
  36         255, 255, 19, 249, 255, 255, 7, 252, 255, 255, 15, 254,
  37         255, 255, 31, 255, 255, 255, 191, 255, 255, 255, 255,
  38         255, 255, 255, 255, 255, 255, 255, 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 };
  45
  46     static char down_mask[] = { 240, 1, 0, 0, 240, 1,
  47         0, 0, 240, 1, 0, 0, 240, 1, 0, 0, 240, 1, 0, 0, 240, 1,
  48         0, 0, 240, 1, 0, 0, 240, 1, 0, 0, 255, 31, 0, 0, 255,
  49         31, 0, 0, 254, 15, 0, 0, 252, 7, 0, 0, 248, 3, 0, 0,
  50         240, 1, 0, 0, 224, 0, 0, 0, 64, 0, 0, 0, 0, 0, 0, 0, 0,
  51         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 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 };
  55
  56     #ifdef __WXMSW__
  57         wxBitmap down_bitmap(down_bits, 32, 32);
  58         wxBitmap down_mask_bitmap(down_mask, 32, 32);
  59
  60         down_bitmap.SetMask(new wxMask(down_mask_bitmap));
  61         wxImage down_image = down_bitmap.ConvertToImage();
  62         down_image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X, 6);
  63         down_image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y, 14);
  64         wxCursor down_cursor = wxCursor(down_image);
  65     #elif defined(__WXGTK__) or defined(__WXMOTIF__)
  66         wxCursor down_cursor = wxCursor(down_bits, 32, 32, 6, 14,
  67                                         down_mask, wxWHITE, wxBLACK);
  68     #endif
  69     @endcode
  70
  71     @library{wxcore}
  72     @category{gdi}
  73
  74     @stdobjects
  75     - ::wxNullCursor
  76     - ::wxSTANDARD_CURSOR
  77     - ::wxHOURGLASS_CURSOR
  78     - ::wxCROSS_CURSOR
  79
  80     @see wxBitmap, wxIcon, wxWindow::SetCursor(), wxSetCursor(), ::wxStockCursor
  81 */
  82 class wxCursor : public wxGDIObject
  83 {
  84 public:
  85     /**
  86         Default constructor.
  87     */
  88     wxCursor();
  89
  90     /**
  91         Constructs a cursor by passing an array of bits (XBM data).
  92
  93         The parameters @a fg and @a bg have an effect only on GTK+, and force
  94         the cursor to use particular background and foreground colours.
  95
  96         If either @a hotSpotX or @a hotSpotY is -1, the hotspot will be the
  97         centre of the cursor image (Motif only).
  98
  99         @param bits
 100             An array of XBM data bits.
 101         @param width
 102             Cursor width.
 103         @param height
 104             Cursor height.
 105         @param hotSpotX
 106             Hotspot x coordinate (relative to the top left of the image).
 107         @param hotSpotY
 108             Hotspot y coordinate (relative to the top left of the image).
 109         @param maskBits
 110             Bits for a mask bitmap.
 111
 112         @onlyfor{wxgtk,wxmotif}
 113
 114         @beginWxPerlOnly
 115         In wxPerl use Wx::Cursor->newData(bits, width, height, hotSpotX = -1, hotSpotY = -1, maskBits = 0).
 116         @endWxPerlOnly
 117     */
 118     wxCursor(const char bits[], int width, int height,
 119              int hotSpotX = -1, int hotSpotY = -1,
 120              const char maskBits[] = NULL);
 121
 122     /**
 123         Constructs a cursor by passing a string resource name or filename.
 124
 125         The arguments @a hotSpotX and @a hotSpotY are only used when there's no
 126         hotspot info in the resource/image-file to load (e.g. when using
 127         @c wxBITMAP_TYPE_ICO under wxMSW or @c wxBITMAP_TYPE_XPM under wxGTK).
 128
 129         @param cursorName
 130             The name of the resource or the image file to load.
 131         @param type
 132             Icon type to load. It defaults to @c wxCURSOR_DEFAULT_TYPE,
 133             which is a @#define associated to different values on different
 134             platforms:
 135             - under Windows, it defaults to @c wxBITMAP_TYPE_CUR_RESOURCE.
 136               Other permitted types under Windows are @c wxBITMAP_TYPE_CUR
 137               (to load a cursor from a .cur cursor file), @c wxBITMAP_TYPE_ICO
 138               (to load a cursor from a .ico icon file) and @c wxBITMAP_TYPE_ANI
 139               (to load a cursor from a .ani 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         Under wxMac (Cocoa), large cursors are supported.
 182
 183         Notice that the @a image can define the cursor hot spot. To set it you
 184         need to use wxImage::SetOption() with @c wxIMAGE_OPTION_CUR_HOTSPOT_X
 185         or @c wxIMAGE_OPTION_CUR_HOTSPOT_Y, e.g.
 186         @code
 187             image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X, hotSpotX);
 188             image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X, hotSpotY);
 189         @endcode
 190     */
 191     wxCursor(const wxImage& image);
 192
 193     /**
 194         Copy constructor, uses @ref overview_refcount "reference counting".
 195
 196         @param cursor
 197             Pointer or reference to a cursor to copy.
 198     */
 199     wxCursor(const wxCursor& cursor);
 200
 201     /**
 202         Destroys the cursor. See
 203         @ref overview_refcount_destruct "reference-counted object destruction"
 204         for more info.
 205
 206         A cursor can be reused for more than one window, and does not get
 207         destroyed when the window is destroyed. wxWidgets destroys all cursors
 208         on application exit, although it is best to clean them up explicitly.
 209     */
 210     virtual ~wxCursor();
 211
 212     /**
 213         Returns @true if cursor data is present.
 214     */
 215     virtual bool IsOk() const;
 216
 217     /**
 218         Assignment operator, using @ref overview_refcount "reference counting".
 219     */
 220     wxCursor& operator =(const wxCursor& cursor);
 221 };
 222
 223
 224 /**
 225     @name Predefined cursors.
 226
 227     @see wxStockCursor
 228 */
 229 //@{
 230 wxCursor wxNullCursor;
 231 wxCursor* wxSTANDARD_CURSOR;
 232 wxCursor* wxHOURGLASS_CURSOR;
 233 wxCursor* wxCROSS_CURSOR;
 234 //@}
 235