Cursors

Cursors — Standard and pixmap cursors

Synopsis


#include <gdk/gdk.h>


            GdkCursor;
enum        GdkCursorType;
GdkCursor*  gdk_cursor_new                  (GdkCursorType cursor_type);
GdkCursor*  gdk_cursor_new_from_pixmap      (GdkPixmap *source,
                                             GdkPixmap *mask,
                                             const GdkColor *fg,
                                             const GdkColor *bg,
                                             gint x,
                                             gint y);
GdkCursor*  gdk_cursor_new_from_pixbuf      (GdkDisplay *display,
                                             GdkPixbuf *pixbuf,
                                             gint x,
                                             gint y);
GdkCursor*  gdk_cursor_new_from_name        (GdkDisplay *display,
                                             const gchar *name);
GdkCursor*  gdk_cursor_new_for_display      (GdkDisplay *display,
                                             GdkCursorType cursor_type);
GdkDisplay* gdk_cursor_get_display          (GdkCursor *cursor);
GdkPixbuf*  gdk_cursor_get_image            (GdkCursor *cursor);
GdkCursor*  gdk_cursor_ref                  (GdkCursor *cursor);
void        gdk_cursor_unref                (GdkCursor *cursor);
#define     gdk_cursor_destroy


Description

These functions are used to create and destroy cursors. There is a number of standard cursors, but it is also possible to construct new cursors from pixmaps and pixbufs. There may be limitations as to what kinds of cursors can be constructed on a given display, see gdk_display_supports_cursor_alpha(), gdk_display_supports_cursor_color(), gdk_display_get_default_cursor_size() and gdk_display_get_maximal_cursor_size().

Cursors by themselves are not very interesting, they must be be bound to a window for users to see them. This is done with gdk_window_set_cursor() or by setting the cursor member of the GdkWindowAttr struct passed to gdk_window_new().

Details

GdkCursor

typedef struct {
  GdkCursorType type;
} GdkCursor;

A GdkCursor structure represents a cursor.

GdkCursorType type; the GdkCursorType of the cursor

enum GdkCursorType

typedef enum
{
  GDK_X_CURSOR 		  = 0,
  GDK_ARROW 		  = 2,
  GDK_BASED_ARROW_DOWN    = 4,
  GDK_BASED_ARROW_UP 	  = 6,
  GDK_BOAT 		  = 8,
  GDK_BOGOSITY 		  = 10,
  GDK_BOTTOM_LEFT_CORNER  = 12,
  GDK_BOTTOM_RIGHT_CORNER = 14,
  GDK_BOTTOM_SIDE 	  = 16,
  GDK_BOTTOM_TEE 	  = 18,
  GDK_BOX_SPIRAL 	  = 20,
  GDK_CENTER_PTR 	  = 22,
  GDK_CIRCLE 		  = 24,
  GDK_CLOCK	 	  = 26,
  GDK_COFFEE_MUG 	  = 28,
  GDK_CROSS 		  = 30,
  GDK_CROSS_REVERSE 	  = 32,
  GDK_CROSSHAIR 	  = 34,
  GDK_DIAMOND_CROSS 	  = 36,
  GDK_DOT 		  = 38,
  GDK_DOTBOX 		  = 40,
  GDK_DOUBLE_ARROW 	  = 42,
  GDK_DRAFT_LARGE 	  = 44,
  GDK_DRAFT_SMALL 	  = 46,
  GDK_DRAPED_BOX 	  = 48,
  GDK_EXCHANGE 		  = 50,
  GDK_FLEUR 		  = 52,
  GDK_GOBBLER 		  = 54,
  GDK_GUMBY 		  = 56,
  GDK_HAND1 		  = 58,
  GDK_HAND2 		  = 60,
  GDK_HEART 		  = 62,
  GDK_ICON 		  = 64,
  GDK_IRON_CROSS 	  = 66,
  GDK_LEFT_PTR 		  = 68,
  GDK_LEFT_SIDE 	  = 70,
  GDK_LEFT_TEE 		  = 72,
  GDK_LEFTBUTTON 	  = 74,
  GDK_LL_ANGLE 		  = 76,
  GDK_LR_ANGLE 	 	  = 78,
  GDK_MAN 		  = 80,
  GDK_MIDDLEBUTTON 	  = 82,
  GDK_MOUSE 		  = 84,
  GDK_PENCIL 		  = 86,
  GDK_PIRATE 		  = 88,
  GDK_PLUS 		  = 90,
  GDK_QUESTION_ARROW 	  = 92,
  GDK_RIGHT_PTR 	  = 94,
  GDK_RIGHT_SIDE 	  = 96,
  GDK_RIGHT_TEE 	  = 98,
  GDK_RIGHTBUTTON 	  = 100,
  GDK_RTL_LOGO 		  = 102,
  GDK_SAILBOAT 		  = 104,
  GDK_SB_DOWN_ARROW 	  = 106,
  GDK_SB_H_DOUBLE_ARROW   = 108,
  GDK_SB_LEFT_ARROW 	  = 110,
  GDK_SB_RIGHT_ARROW 	  = 112,
  GDK_SB_UP_ARROW 	  = 114,
  GDK_SB_V_DOUBLE_ARROW   = 116,
  GDK_SHUTTLE 		  = 118,
  GDK_SIZING 		  = 120,
  GDK_SPIDER		  = 122,
  GDK_SPRAYCAN 		  = 124,
  GDK_STAR 		  = 126,
  GDK_TARGET 		  = 128,
  GDK_TCROSS 		  = 130,
  GDK_TOP_LEFT_ARROW 	  = 132,
  GDK_TOP_LEFT_CORNER 	  = 134,
  GDK_TOP_RIGHT_CORNER 	  = 136,
  GDK_TOP_SIDE 		  = 138,
  GDK_TOP_TEE 		  = 140,
  GDK_TREK 		  = 142,
  GDK_UL_ANGLE 		  = 144,
  GDK_UMBRELLA 		  = 146,
  GDK_UR_ANGLE 		  = 148,
  GDK_WATCH 		  = 150,
  GDK_XTERM 		  = 152,
  GDK_LAST_CURSOR,
  GDK_CURSOR_IS_PIXMAP 	= -1
} GdkCursorType;

The standard cursors available.

GDK_X_CURSOR
GDK_ARROW
GDK_BASED_ARROW_DOWN
GDK_BASED_ARROW_UP
GDK_BOAT
GDK_BOGOSITY
GDK_BOTTOM_LEFT_CORNER
GDK_BOTTOM_RIGHT_CORNER
GDK_BOTTOM_SIDE
GDK_BOTTOM_TEE
GDK_BOX_SPIRAL
GDK_CENTER_PTR
GDK_CIRCLE
GDK_CLOCK
GDK_COFFEE_MUG
GDK_CROSS
GDK_CROSS_REVERSE
GDK_CROSSHAIR
GDK_DIAMOND_CROSS
GDK_DOT
GDK_DOTBOX
GDK_DOUBLE_ARROW
GDK_DRAFT_LARGE
GDK_DRAFT_SMALL
GDK_DRAPED_BOX
GDK_EXCHANGE
GDK_FLEUR
GDK_GOBBLER
GDK_GUMBY
GDK_HAND1
GDK_HAND2
GDK_HEART
GDK_ICON
GDK_IRON_CROSS
GDK_LEFT_PTR
GDK_LEFT_SIDE
GDK_LEFT_TEE
GDK_LEFTBUTTON
GDK_LL_ANGLE
GDK_LR_ANGLE
GDK_MAN
GDK_MIDDLEBUTTON
GDK_MOUSE
GDK_PENCIL
GDK_PIRATE
GDK_PLUS
GDK_QUESTION_ARROW
GDK_RIGHT_PTR
GDK_RIGHT_SIDE
GDK_RIGHT_TEE
GDK_RIGHTBUTTON
GDK_RTL_LOGO
GDK_SAILBOAT
GDK_SB_DOWN_ARROW
GDK_SB_H_DOUBLE_ARROW
GDK_SB_LEFT_ARROW
GDK_SB_RIGHT_ARROW
GDK_SB_UP_ARROW
GDK_SB_V_DOUBLE_ARROW
GDK_SHUTTLE
GDK_SIZING
GDK_SPIDER
GDK_SPRAYCAN
GDK_STAR
GDK_TARGET
GDK_TCROSS
GDK_TOP_LEFT_ARROW
GDK_TOP_LEFT_CORNER
GDK_TOP_RIGHT_CORNER
GDK_TOP_SIDE
GDK_TOP_TEE
GDK_TREK
GDK_UL_ANGLE
GDK_UMBRELLA
GDK_UR_ANGLE
GDK_WATCH
GDK_XTERM
GDK_LAST_CURSOR last cursor type
GDK_CURSOR_IS_PIXMAP type of cursors constructed with gdk_cursor_new_from_pixmap() or gdk_cursor_new_from_pixbuf()

gdk_cursor_new ()

GdkCursor*  gdk_cursor_new                  (GdkCursorType cursor_type);

Creates a new cursor from the set of builtin cursors for the default display. See gdk_cursor_new_for_display().

To make the cursor invisible, use gdk_cursor_new_from_pixmap() to create a cursor with no pixels in it.

cursor_type : cursor to create
Returns : a new GdkCursor

gdk_cursor_new_from_pixmap ()

GdkCursor*  gdk_cursor_new_from_pixmap      (GdkPixmap *source,
                                             GdkPixmap *mask,
                                             const GdkColor *fg,
                                             const GdkColor *bg,
                                             gint x,
                                             gint y);

Creates a new cursor from a given pixmap and mask. Both the pixmap and mask must have a depth of 1 (i.e. each pixel has only 2 values - on or off). The standard cursor size is 16 by 16 pixels. You can create a bitmap from inline data as in the below example.

Example 6. Creating a custom cursor

/* This data is in X bitmap format, and can be created with the 'bitmap'
   utility. */
#define cursor1_width 16
#define cursor1_height 16
static unsigned char cursor1_bits[] = {
  0x80, 0x01, 0x40, 0x02, 0x20, 0x04, 0x10, 0x08, 0x08, 0x10, 0x04, 0x20,
  0x82, 0x41, 0x41, 0x82, 0x41, 0x82, 0x82, 0x41, 0x04, 0x20, 0x08, 0x10,
  0x10, 0x08, 0x20, 0x04, 0x40, 0x02, 0x80, 0x01};
 
static unsigned char cursor1mask_bits[] = {
  0x80, 0x01, 0xc0, 0x03, 0x60, 0x06, 0x30, 0x0c, 0x18, 0x18, 0x8c, 0x31,
  0xc6, 0x63, 0x63, 0xc6, 0x63, 0xc6, 0xc6, 0x63, 0x8c, 0x31, 0x18, 0x18,
  0x30, 0x0c, 0x60, 0x06, 0xc0, 0x03, 0x80, 0x01};
 
 
 GdkCursor *cursor;
 GdkPixmap *source, *mask;
 GdkColor fg = { 0, 65535, 0, 0 }; /* Red. */
 GdkColor bg = { 0, 0, 0, 65535 }; /* Blue. */
 
 
 source = gdk_bitmap_create_from_data (NULL, cursor1_bits,
                                       cursor1_width, cursor1_height);
 mask = gdk_bitmap_create_from_data (NULL, cursor1mask_bits,
                                     cursor1_width, cursor1_height);
 cursor = gdk_cursor_new_from_pixmap (source, mask, &fg, &bg, 8, 8);
 gdk_pixmap_unref (source);
 gdk_pixmap_unref (mask);
 
 
 gdk_window_set_cursor (widget->window, cursor);


source : the pixmap specifying the cursor.
mask : the pixmap specifying the mask, which must be the same size as source.
fg : the foreground color, used for the bits in the source which are 1. The color does not have to be allocated first.
bg : the background color, used for the bits in the source which are 0. The color does not have to be allocated first.
x : the horizontal offset of the 'hotspot' of the cursor.
y : the vertical offset of the 'hotspot' of the cursor.
Returns : a new GdkCursor.

gdk_cursor_new_from_pixbuf ()

GdkCursor*  gdk_cursor_new_from_pixbuf      (GdkDisplay *display,
                                             GdkPixbuf *pixbuf,
                                             gint x,
                                             gint y);

Creates a new cursor from a pixbuf.

Not all GDK backends support RGBA cursors. If they are not supported, a monochrome approximation will be displayed. The functions gdk_display_supports_cursor_alpha() and gdk_display_supports_cursor_color() can be used to determine whether RGBA cursors are supported; gdk_display_get_default_cursor_size() and gdk_display_get_maximal_cursor_size() give information about cursor sizes.

On the X backend, support for RGBA cursors requires a sufficently new version of the X Render extension.

display : the GdkDisplay for which the cursor will be created
pixbuf : the GdkPixbuf containing the cursor image
x : the horizontal offset of the 'hotspot' of the cursor.
y : the vertical offset of the 'hotspot' of the cursor.
Returns : a new GdkCursor.

Since 2.4


gdk_cursor_new_from_name ()

GdkCursor*  gdk_cursor_new_from_name        (GdkDisplay *display,
                                             const gchar *name);

Creates a new cursor by looking up name in the current cursor theme.

display : the GdkDisplay for which the cursor will be created
name : the name of the cursor
Returns : a new GdkCursor, or NULL if there is no cursor with the given name

Since 2.8


gdk_cursor_new_for_display ()

GdkCursor*  gdk_cursor_new_for_display      (GdkDisplay *display,
                                             GdkCursorType cursor_type);

Creates a new cursor from the set of builtin cursors. Some useful ones are:

To make the cursor invisible, use gdk_cursor_new_from_pixmap() to create a cursor with no pixels in it.

display : the GdkDisplay for which the cursor will be created
cursor_type : cursor to create
Returns : a new GdkCursor

Since 2.2


gdk_cursor_get_display ()

GdkDisplay* gdk_cursor_get_display          (GdkCursor *cursor);

Returns the display on which the GdkCursor is defined.

cursor : a GdkCursor.
Returns : the GdkDisplay associated to cursor

Since 2.2


gdk_cursor_get_image ()

GdkPixbuf*  gdk_cursor_get_image            (GdkCursor *cursor);

Returns a GdkPixbuf with the image used to display the cursor.

Note that depending on the capabilities of the windowing system and on the cursor, GDK may not be able to obtain the image data. In this case, NULL is returned.

cursor : a GdkCursor
Returns : a GdkPixbuf representing cursor, or NULL

Since 2.8


gdk_cursor_ref ()

GdkCursor*  gdk_cursor_ref                  (GdkCursor *cursor);

Adds a reference to cursor.

cursor : a GdkCursor
Returns : Same cursor that was passed in

gdk_cursor_unref ()

void        gdk_cursor_unref                (GdkCursor *cursor);

Removes a reference from cursor, deallocating the cursor if no references remain.

cursor : a GdkCursor

gdk_cursor_destroy

#define gdk_cursor_destroy             gdk_cursor_unref

Warning

gdk_cursor_destroy is deprecated and should not be used in newly-written code.

Destroys a cursor, freeing any resources allocated for it.