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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.

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