Cursor

class Cursor(**properties: Any)

Superclasses: Object

GdkCursor is used to create and destroy cursors.

Cursors are immutable objects, so once you created them, there is no way to modify them later. You should create a new cursor when you want to change something about it.

Cursors by themselves are not very interesting: they must be bound to a window for users to see them. This is done with set_cursor or set_device_cursor. Applications will typically use higher-level GTK functions such as gtk_widget_set_cursor() instead.

Cursors are not bound to a given Display, so they can be shared. However, the appearance of cursors may vary when used on different platforms.

Named and texture cursors

There are multiple ways to create cursors. The platform’s own cursors can be created with new_from_name. That function lists the commonly available names that are shared with the CSS specification. Other names may be available, depending on the platform in use. On some platforms, what images are used for named cursors may be influenced by the cursor theme.

Another option to create a cursor is to use new_from_texture and provide an image to use for the cursor.

To ease work with unsupported cursors, a fallback cursor can be provided. If a Surface cannot use a cursor because of the reasons mentioned above, it will try the fallback cursor. Fallback cursors can themselves have fallback cursors again, so it is possible to provide a chain of progressively easier to support cursors. If none of the provided cursors can be supported, the default cursor will be the ultimate fallback.

Constructors

class Cursor

classmethod new_from_callback(callback: Callable[[Cursor, int, float, Any], Tuple[Texture | None, int, int, int, int]], data: Any = None, fallback: Cursor | None = None) → Cursor | None

Creates a new callback-based cursor object.

Cursors of this kind produce textures for the cursor image on demand, when the callback is called.

Added in version 4.16.

Parameters:

• callback – the GdkCursorGetTextureCallback

• data – data to pass to callback

• fallback – the GdkCursor to fall back to when this one cannot be supported

classmethod new_from_name(name: str, fallback: Cursor | None = None) → Cursor | None

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

A recommended set of cursor names that will work across different platforms can be found in the CSS specification:

“none”	“default”	“help”	“pointer”
“context-menu”	“progress”	“wait”	“cell”
“crosshair”	“text”	“vertical-text”	“alias”
“copy”	“no-drop”	“move”	“not-allowed”
“grab”	“grabbing”	“all-scroll”	“col-resize”
“row-resize”	“n-resize”	“e-resize”	“s-resize”
“w-resize”	“ne-resize”	“nw-resize”	“sw-resize”
“se-resize”	“ew-resize”	“ns-resize”	“nesw-resize”
“nwse-resize”	“zoom-in”	“zoom-out”

Parameters:

• name – the name of the cursor

• fallback – None or the GdkCursor to fall back to when this one cannot be supported

classmethod new_from_texture(texture: Texture, hotspot_x: int, hotspot_y: int, fallback: Cursor | None = None) → Cursor

Creates a new cursor from a GdkTexture.

Parameters:

• texture – the texture providing the pixel data

• hotspot_x – the horizontal offset of the “hotspot” of the cursor

• hotspot_y – the vertical offset of the “hotspot” of the cursor

• fallback – the GdkCursor to fall back to when this one cannot be supported

Methods

class Cursor

get_fallback() → Cursor | None

Returns the fallback for this cursor.

The fallback will be used if this cursor is not available on a given GdkDisplay. For named cursors, this can happen when using nonstandard names or when using an incomplete cursor theme. For textured cursors, this can happen when the texture is too large or when the GdkDisplay it is used on does not support textured cursors.

get_hotspot_x() → int

Returns the horizontal offset of the hotspot.

The hotspot indicates the pixel that will be directly above the cursor.

Note that named cursors may have a nonzero hotspot, but this function will only return the hotspot position for cursors created with new_from_texture.

get_hotspot_y() → int

Returns the vertical offset of the hotspot.

The hotspot indicates the pixel that will be directly above the cursor.

Note that named cursors may have a nonzero hotspot, but this function will only return the hotspot position for cursors created with new_from_texture.

get_name() → str | None

Returns the name of the cursor.

If the cursor is not a named cursor, None will be returned.

get_texture() → Texture | None

Returns the texture for the cursor.

If the cursor is a named cursor, None will be returned.

Properties

class Cursor

props.fallback: Cursor

The type of the None singleton.

props.hotspot_x: int

The type of the None singleton.

props.hotspot_y: int

The type of the None singleton.

props.name: str

The type of the None singleton.

props.texture: Texture

The type of the None singleton.