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53 lines
1.3 KiB
Python
53 lines
1.3 KiB
Python
import curses
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import typing as T
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from .base import WindowWrapper
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class Scrollable(WindowWrapper):
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def __init__(self, *args: T.Any, **kwargs: T.Any) -> None:
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super().__init__(*args, **kwargs)
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self._scroll_y = 0
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self._pad: T.Optional[T.Any] = curses.newpad(1, 1)
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self._items: T.List[T.Any] = []
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def clear(self) -> None:
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self._items = []
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self.scroll_to_item(0)
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def scroll_to_item(self, y: int) -> None:
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if not self._items or not self._win:
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return
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if y < 0:
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y %= len(self._items)
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while not (self._scroll_y <= y < self._scroll_y + self.getmaxyx()[0]):
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self._scroll_y += 1 if self._scroll_y < y else -1
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def stop(self) -> None:
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super().stop()
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del self._pad
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self._pad = None
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def __len__(self) -> int:
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return len(self._items)
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def render(self) -> None:
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if not self._pad:
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return
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if self._items:
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self._pad.resize(
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max(1, len(self._items)), max(1, self.getmaxyx()[1] + 1)
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)
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else:
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self._pad.resize(1, 1)
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self._pad.erase()
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try:
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self._render_impl()
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except curses.error:
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pass
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def _render_impl(self) -> None:
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raise NotImplementedError("not implemented")
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