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[no ci] Begin caching of offsets

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This commit is contained in:
Darren Burns
2023-02-09 16:43:05 +00:00
parent 84141630bc
commit 22ab4f80af
1 changed files with 10 additions and 4 deletions
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6
src/textual/widgets/_data_table.py
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@@ -442,6 +442,8 @@ class DataTable(ScrollView, Generic[CellType], can_focus=True):
"""Cache for individual cells."""
self._line_cache: LRUCache[LineCacheKey, Strip] = LRUCache(1000)
"""Cache for lines within rows."""
self._offset_cache: LRUCache[int, list[[tuple[RowKey, int]]]] = LRUCache(1)
"""Cached y_offset - key is update_count - see y_offsets property for more information"""
self._require_update_dimensions: bool = False
"""Set to re-calculate dimensions on idle."""
@@ -501,10 +503,14 @@ class DataTable(ScrollView, Generic[CellType], can_focus=True):
lands on, and the y-offset *within* that row. The length of the returned list
is therefore the total height of all rows within the DataTable."""
y_offsets: list[tuple[RowKey, int]] = []
if self._update_count in self._offset_cache:
y_offsets = self._offset_cache[self._update_count]
else:
for row in self.ordered_rows:
row_key = row.key
row_height = row.height
y_offsets += [(row_key, y) for y in range(row_height)]
self._offset_cache = y_offsets
return y_offsets
@property