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The board learns to zoom — eight rungs on one ruler, and Actual Size is the untouched board

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View ▸ Zoom In / Zoom Out / Actual Size (⌘+ / ⌘− / ⌘0): 75%–200% in eight
rungs, app-wide and persisted (the Show Comments precedent) — a viewing
comfort, not a property of any one board. The level travels as
BoardZoomContext in the environment, injected on BoardView alone so the
banner strip, search bar, sheets and popovers stay at the system size; the
environment is also what carries it through CardFaceView's equality gate,
which compares nothing that moves with the level. Every BoardMetrics figure
follows zoom.bodyPointSize — card and lane chrome, drag replicas and the
count badge, the resize handle, the trash column — and the drop registry
carries the ruler for event-time reads, with the autoscroller's three
reaches turning font-derived (reachSide named as the stripGap it always
equalled). Lanes still divide the window; zoom never moves the window or
its floor. The toolbar gains a catalog-only Zoom In/Out pair mirroring the
menu rows' predicate; zoom holds shut mid-drag (frozen geometry), each rung
announces itself to VoiceOver, and the render suite pins both invariants:
a rung repaints every face, a no-op Actual Size repaints nothing.

Claude-Session: https://claude.ai/code/session_014PtZdPwqZuqEDLc6wZMtEy
This commit is contained in:
rzen
2026-08-07 11:22:02 -04:00
parent d5ad21c3da
commit cfee4a4b41
29 changed files with 1491 additions and 101 deletions
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Kanban/UI/Board/DragAutoScroller.swift
+17 -1
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@@ -40,6 +40,20 @@ final class DragAutoScroller {
/// Invoked after every scroll step. Re-resolves the drop proposal; see the type's note.
fileprivate var didScroll: (() -> Void)?
/// The board's ruler, for the engagement rect's three reaches — they are distances to the lane's
/// own furniture, which moves with the zoom level (`DragAutoScrollMath.reachAbove`;
/// 03-board-ui.md ▸ Layout — zoom).
///
/// Set by the lane at the head of each drag rather than observed, because that is exactly when it
/// can change: zoom is inert while a session is in flight (`ZoomCommands.isEnabled`), so one read
/// per drag is one read per level.
///
/// Optional, and resolved at use rather than defaulted in `init`, because the initialiser is
/// `nonisolated` (the tick-source seam is constructed off the main actor in tests) and the system
/// body size is a main-actor read. Un-set means "nobody has told me", which resolves to the
/// system's ruler — an un-zoomed board's answer.
var bodyPointSize: CGFloat?
/// Where frames come from. One implementation ships (`DisplayLinkTickSource`); the seam exists
/// because a `CADisplayLink` needs a screen and a run loop and so cannot tick in a test bundle
/// (`DragAutoScrollDriverTests`).
@@ -81,7 +95,9 @@ final class DragAutoScroller {
let inWindow = window.convertPoint(fromScreen: NSEvent.mouseLocation)
let inClip = clip.convert(inWindow, from: nil)
let pointer = CGPoint(x: inClip.x - visible.minX, y: inClip.y - visible.minY)
guard DragAutoScrollMath.engagementRect(viewport: visible.size).contains(pointer) else { return }
let ruler = bodyPointSize ?? BoardMetrics.bodyPointSize
guard DragAutoScrollMath.engagementRect(viewport: visible.size, bodyPointSize: ruler)
.contains(pointer) else { return }
let velocity = DragAutoScrollMath.velocity(pointer: pointer, viewport: visible.size)
guard velocity.dx != 0 || velocity.dy != 0 else { return }