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from __future__ import annotations
from collections import defaultdict
from typing import TYPE_CHECKING, Callable
from prompt_toolkit.mouse_events import MouseEvent
if TYPE_CHECKING:
from prompt_toolkit.key_binding.key_bindings import NotImplementedOrNone
__all__ = [
"MouseHandler",
"MouseHandlers",
]
MouseHandler = Callable[[MouseEvent], "NotImplementedOrNone"]
class MouseHandlers:
"""
Two dimensional raster of callbacks for mouse events.
"""
def __init__(self) -> None:
def dummy_callback(mouse_event: MouseEvent) -> NotImplementedOrNone:
"""
:param mouse_event: `MouseEvent` instance.
"""
return NotImplemented
# NOTE: Previously, the data structure was a dictionary mapping (x,y)
# to the handlers. This however would be more inefficient when copying
# over the mouse handlers of the visible region in the scrollable pane.
# Map y (row) to x (column) to handlers.
self.mouse_handlers: defaultdict[
int, defaultdict[int, MouseHandler]
] = defaultdict(lambda: defaultdict(lambda: dummy_callback))
def set_mouse_handler_for_range(
self,
x_min: int,
x_max: int,
y_min: int,
y_max: int,
handler: Callable[[MouseEvent], NotImplementedOrNone],
) -> None:
"""
Set mouse handler for a region.
"""
for y in range(y_min, y_max):
row = self.mouse_handlers[y]
for x in range(x_min, x_max):
row[x] = handler
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