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文件: /usr/share/doc/python-urwid-1.1.1/docs/manual/wcur1.py
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import urwid class CursorPudding(urwid.Widget): _sizing = frozenset(['flow']) _selectable = True def __init__(self): self.cursor_col = 0 def rows(self, size, focus=False): return 1 def render(self, size, focus=False): (maxcol,) = size num_pudding = maxcol / len("Pudding") cursor = None if focus: cursor = self.get_cursor_coords(size) return urwid.TextCanvas(["Pudding" * num_pudding], [], cursor, maxcol) def get_cursor_coords(self, size): (maxcol,) = size col = min(self.cursor_col, maxcol - 1) return col, 0 def keypress(self, size, key): (maxcol, ) = size if key == 'left': col = self.cursor_col - 1 elif key == 'right': col = self.cursor_col + 1 else: return key self.cursor_x = max(0, min(maxcol - 1, col)) self._invalidate()
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