46 lines
1.1 KiB
Python
46 lines
1.1 KiB
Python
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())
|