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74 lines
2.1 KiB
Python
74 lines
2.1 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, parent: T.Any, h: int, w: int, y: int, x: int) -> None:
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super().__init__(parent, h, w, y, x)
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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 or not self._win:
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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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h, w = self.getmaxyx()
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y, x = self.getbegyx()
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try:
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if self._scroll_y > 0 or self._scroll_y + h < len(self._items):
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y1 = self._scroll_y
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y2 = self._scroll_y + h
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win_y1 = int(y1 * h // len(self._items))
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win_y2 = int(y2 * h // len(self._items))
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for win_y in range(win_y1, win_y2):
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self._win.chgat(win_y, 0, curses.A_REVERSE)
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self._win.noutrefresh()
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self._render_impl(h, w - 1)
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self._pad.noutrefresh(
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self._scroll_y, 0, y, x, y + h - 1, x + w - 2
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)
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else:
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self._render_impl(h, w)
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self._pad.noutrefresh(
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self._scroll_y, 0, y, x, y + h - 1, x + w - 1
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)
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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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