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