The split style's pull-to-expand fires the moment the drag clears its
threshold, and that turned out to be the better feel — so paging now does
the same everywhere: month, week and day.
Waiting for the lift meant the page sat still under a finger that had
already travelled far enough to ask for it, and the answer only arrived
once you let go, which reads as the view being slow rather than as a
deliberate commit. The trade is that a drag can no longer be taken back by
dragging the other way; once you have moved 24dp deliberately you meant it,
and the page you left is one swipe back.
The three views had three copies of the same detector, so this extracts one
rememberCalendarPageSwipe and the threshold constant beside it. It stays
horizontal-only on purpose: the week and day timelines scroll vertically
underneath, and a two-dimensional detector would claim those drags before
the inner scroll saw them. The month keeps its own axis-locking detector
because the split style needs the vertical axis, and now shares the
threshold.
Also fixes the selection outline shivering rather than fading. Its animated
alpha was read while composing the cell, so every frame of the fade
recomposed all 42 cells at once — the fade was driving the whole grid
through recomposition to change one colour. It is now held as a State and
read inside a drawBehind, which keeps it in the draw phase where it touches
nothing but pixels. That means drawing the rounded rect by hand instead of
Modifier.border, so the corner radius is named alongside CELL_SHAPE to stop
the two drifting.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Jean-Luc Makiola
beb8536e8a