cf04ea435a
Tasks completed: 3/3 - Task 1: Migrate to modern UITableViewDragDelegate/UITableViewDropDelegate - Task 2: Implement lift animation with scale, shadow, and tilt - Task 3: Add haptic feedback for grab and drop All tasks completed in single commit due to code interdependency. SUMMARY: .planning/phases/04-drag-interaction/04-01-SUMMARY.md
5.4 KiB
5.4 KiB
Project State: Itinerary Editor
Project Reference
Core Value: Drag-and-drop that operates on semantic positions (day + sortOrder), not row indices - so user intent is preserved across data reloads.
Current Focus: Phase 4 Plan 1 Complete - Modern drag-drop delegates with lift animation and haptics
Current Position
Phase: 4 of 4 (Drag Interaction) Plan: 1 of 2 complete Status: In progress Last activity: 2026-01-18 - Completed 04-01-PLAN.md
Progress: [########--] 87.5%
Phase 1: [##########] 100% (2/2 plans) COMPLETE
Phase 2: [##########] 100% (2/2 plans) COMPLETE
Phase 3: [##########] 100% (2/2 plans) COMPLETE
Phase 4: [#####-----] 50% (1/2 plans)
Performance Metrics
| Metric | Value |
|---|---|
| Total Requirements | 23 |
| Completed | 20 |
| Current Phase | 4 (in progress) |
| Plans Executed | 7 |
Accumulated Context
Key Decisions
| Decision | Rationale | Phase |
|---|---|---|
| UITableView over SwiftUI List | SwiftUI drag-drop lacks insertion line precision | Pre-planning |
| (day, sortOrder) position model | Row indices break on reload; semantic position is stable | Pre-planning |
| Insertion lines (not zones) | User wants precise feedback on exact drop location | Pre-planning |
| Invalid drops rejected (snap back) | Cleaner than auto-clamping; user knows what happened | Pre-planning |
| Games get sortOrder from 100 + minutes since midnight | Range 100-1540 leaves room for negative sortOrder items | 01-01 |
| Normalization threshold at 1e-10 | Standard floating-point comparison for precision exhaustion | 01-01 |
| Day 1 = trip.startDate | 1-indexed, games belong to their start date | 01-01 |
| Swift Testing (@Test) over XCTest | Matches existing project test patterns | 01-02 |
| LocalItineraryItem conversion for testing | Avoids #Predicate macro issues with local captures | 01-02 |
| Edge case tests cover all boundaries | Day 0, beyond trip, exact sortOrder, negative/large values | 02-02 |
| Success criteria verification tests | Tests named 'success_*' directly verify ROADMAP criteria | 02-02 |
| Day headers not positioned items | Always first in each day, not part of sortOrder-based ordering | 03-01 |
| Flattener is pure function | No instance state, no side effects for easy testing and determinism | 03-01 |
| gamesByDay dictionary for flattener | Built in reloadData() to pass to flattener | 03-01 |
| success_* test naming convention | Maps tests directly to ROADMAP success criteria | 03-02 |
| Modern drag delegates for custom previews | UITableViewDragDelegate/UITableViewDropDelegate enable lift animation | 04-01 |
| DragContext for session state | Store drag state in session.localContext for access across delegates | 04-01 |
| Lift animation: 1.025x scale, 2-deg tilt | iOS Reminders-style quick/snappy lift per CONTEXT.md | 04-01 |
| Dual haptic generators (light/medium) | Prepare both at drag start for reduced latency | 04-01 |
Learned
- Previous attempts failed due to row-based thinking instead of semantic positioning
- Travel was incorrectly treated as structural ("travelBefore") instead of positional
- Hard-coded flatten order ignoring sortOrder caused reload issues
- SortOrderProvider provides static methods for all sortOrder calculations
- Trip extension provides instance methods for day number derivation
- 50 midpoint insertions maintain distinct sortOrder values before precision loss
- ItineraryConstraints provides isValidPosition(), validDayRange(), barrierGames() for drag validation
- Travel sortOrder constraints: must be AFTER (not equal to) departure game sortOrder
- ItineraryFlattener.flatten() is the single source of truth for display ordering
- 13 tests now verify deterministic flattening behavior
- Modern drag delegates require holistic implementation (can't separate lift/haptics from delegates)
- CATransform3D with m34 perspective creates convincing 3D lift effect
- Snapshot-based animation avoids modifying actual cell during drag
TODOs
- Create tests for semantic position persistence (Plan 01-02) - COMPLETE
- Migrate constraint tests to Swift Testing (Plan 02-01) - COMPLETE
- Add edge case tests and API documentation (Plan 02-02) - COMPLETE
- Create ItineraryFlattener utility (Plan 03-01) - COMPLETE
- Add flattening tests (Plan 03-02) - COMPLETE
- Migrate to modern drag-drop delegates (Plan 04-01) - COMPLETE
- Add insertion line and invalid zone feedback (Plan 04-02) - NEXT
Blockers
None currently.
Session Continuity
Last Session: 2026-01-18T22:44:26Z Stopped at: Completed 04-01-PLAN.md Resume file: None
Context for Next Session
Phase 4 Plan 1 complete:
- Migrated to UITableViewDragDelegate/UITableViewDropDelegate
- Implemented lift animation with scale (1.025x), shadow, and tilt (2 degrees)
- Added dual haptic feedback (light grab, medium drop)
- Created DragContext class for drag session state
Requirements completed in 04-01:
- DRAG-01: Lift animation on grab (shadow + slight scale)
- DRAG-06: Haptic feedback on grab (light) and drop (medium)
- DRAG-08: Slight tilt during drag (2-3 degrees)
Ready for 04-02: Themed insertion line, invalid zone feedback, snap-back animation
- DRAG-02: Insertion line showing drop target
- DRAG-03: Items shuffle during drag
- DRAG-04: Magnetic snap on drop
- DRAG-05: Invalid drops with snap-back
- DRAG-07: Auto-scroll at viewport edge
State initialized: 2026-01-18 Last updated: 2026-01-18