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