Cursor.from_callback
Description:
[ CCode ( has_construct_function = false ) ]
[ Version ( since = "4.16" ) ]
public Cursor.from_callback (owned CursorGetTextureCallback callback, Cursor? fallback)
  [ Version ( since = "4.16" ) ]
public Cursor.from_callback (owned CursorGetTextureCallback callback, Cursor? fallback)
Creates a new callback-based cursor object.
Cursors of this kind produce textures for the cursor image on demand, when the callback is called.
Parameters:
| callback | the `GdkCursorGetTextureCallback` | 
| fallback | the `GdkCursor` to fall back to when this one cannot be supported | 
| data | data to pass to  | 
| destroy | destroy notify for  | 
Returns:
| a new `GdkCursor` |