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