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from __future__ import annotations
from functools import singledispatch
from typing import Union
from gaphas.connector import Handle
from gaphas.item import Element, Item, Line
from gaphas.types import Pos
DEFAULT_CURSOR = "default"
@singledispatch
def cursor(item: Union[Item, None], handle: Union[Handle, None], pos: Pos) -> str:
return DEFAULT_CURSOR
ELEMENT_CURSORS = ("nw-resize", "ne-resize", "se-resize", "sw-resize")
@cursor.register
def element_hover(item: Element, handle: Union[Handle, None], pos: Pos) -> str:
if handle:
index = item.handles().index(handle)
return ELEMENT_CURSORS[index] if index < 4 else DEFAULT_CURSOR
return DEFAULT_CURSOR
LINE_CURSOR = "move"
@cursor.register
def line_hover(item: Line, handle: Union[Handle, None], pos: Pos) -> str:
return LINE_CURSOR if handle else DEFAULT_CURSOR
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