47 lines
1.1 KiB
Python
47 lines
1.1 KiB
Python
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from collections import deque
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from typing import Deque, Optional
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from .base import Clipboard, ClipboardData
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__all__ = [
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"InMemoryClipboard",
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]
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class InMemoryClipboard(Clipboard):
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"""
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Default clipboard implementation.
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Just keep the data in memory.
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This implements a kill-ring, for Emacs mode.
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"""
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def __init__(
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self, data: Optional[ClipboardData] = None, max_size: int = 60
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) -> None:
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assert max_size >= 1
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self.max_size = max_size
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self._ring: Deque[ClipboardData] = deque()
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if data is not None:
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self.set_data(data)
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def set_data(self, data: ClipboardData) -> None:
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self._ring.appendleft(data)
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while len(self._ring) > self.max_size:
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self._ring.pop()
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def get_data(self) -> ClipboardData:
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if self._ring:
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return self._ring[0]
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else:
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return ClipboardData()
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def rotate(self) -> None:
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if self._ring:
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# Add the very first item at the end.
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self._ring.append(self._ring.popleft())
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