docs(04-01): complete modern drag-drop delegates plan
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
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---
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phase: 04-drag-interaction
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plan: 01
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subsystem: ui
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tags: [drag-drop, uitableview, haptics, animations, uikit]
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# Dependency graph
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requires:
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- phase: 03-visual-flattening
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provides: ItineraryFlattener.flatten() for row-to-semantic translation
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provides:
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- UITableViewDragDelegate/UITableViewDropDelegate implementation
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- Lift animation with scale, shadow, and tilt
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- Haptic feedback for grab and drop
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- DragContext for tracking drag state
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affects: [04-02]
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# Tech tracking
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tech-stack:
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added: []
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patterns:
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- "Modern drag delegates (UITableViewDragDelegate/UITableViewDropDelegate) for custom previews"
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- "DragContext class for drag session state management"
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- "Snapshot-based lift animation with CATransform3D"
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key-files:
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created: []
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modified:
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- SportsTime/Features/Trip/Views/ItineraryTableViewController.swift
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key-decisions:
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- "Tasks 2-3 completed as part of Task 1 - delegate pattern required holistic implementation"
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- "Lift animation parameters: 1.025x scale, 2-degree tilt, 0.25 shadow opacity"
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- "Animation timing: 0.15s lift, 0.2s drop, spring damping 0.85/0.8"
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- "Separate haptic generators: light for grab, medium for drop"
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patterns-established:
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- "DragContext: Store drag state in session.localContext for access across delegate methods"
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- "Snapshot-based animations: Create UIView snapshot for custom lift/drop effects"
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- "Dual haptic generators: Prepare both at drag start for reduced latency"
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# Metrics
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duration: 3min
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completed: 2026-01-18
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---
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# Phase 4 Plan 1: Modern Drag-Drop Delegates Summary
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**Modern UITableViewDragDelegate/UITableViewDropDelegate with iOS Reminders-style lift animation (1.025x scale, 2-degree tilt) and dual haptic feedback (light grab, medium drop)**
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## Performance
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- **Duration:** 3 min
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- **Started:** 2026-01-18T22:41:34Z
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- **Completed:** 2026-01-18T22:44:26Z
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- **Tasks:** 3 (completed in single commit due to code interdependency)
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- **Files modified:** 1
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## Accomplishments
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- Migrated from legacy reordering to modern UITableViewDragDelegate/UITableViewDropDelegate
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- Implemented custom lift animation with scale (1.025x), shadow, and 3D tilt (2 degrees)
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- Added dual haptic feedback: light on grab, medium on successful drop
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- Created DragContext class for managing drag session state across delegate methods
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- Integrated existing constraint validation logic (computeValidDestinationRowsProposed, nearestValue)
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## Task Commits
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All three tasks were completed in a single commit because the modern drag delegate pattern requires the lift animation and haptic feedback to be implemented together with the delegate methods:
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1. **Task 1: Migrate to Modern Drag-Drop Delegates** - `749ca30` (feat)
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2. **Task 2: Implement Lift Animation** - included in `749ca30` (code interdependency)
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3. **Task 3: Add Haptic Feedback** - included in `749ca30` (code interdependency)
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**Plan metadata:** (pending)
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## Files Created/Modified
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- `SportsTime/Features/Trip/Views/ItineraryTableViewController.swift` - Added 364 lines:
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- DragContext class for drag state management
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- UITableViewDragDelegate extension (itemsForBeginning, dragPreviewParametersForRowAt, dragSessionWillBegin, dragSessionDidEnd)
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- UITableViewDropDelegate extension (performDropWith, dropSessionDidUpdate, dropSessionDidEnd)
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- Lift Animation Helpers extension (createLiftedSnapshot, animateLift, animateDrop)
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- New properties: lightHaptic, mediumHaptic, currentDragContext
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## Decisions Made
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1. **Unified implementation of Tasks 1-3** - The modern drag delegate pattern inherently requires lift animation and haptic feedback to be implemented as part of the delegate methods. Separating them into atomic commits would have required artificial refactoring steps that don't match how the code naturally fits together.
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2. **Animation parameters per CONTEXT.md:**
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- Scale: 1.025 (middle of 1.02-1.03 range)
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- Tilt: 2 degrees around Y axis
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- Shadow: offset (0, 8), radius 16, opacity 0.25
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- Lift duration: 0.15s with spring damping 0.85
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- Drop duration: 0.2s with spring damping 0.8
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3. **Dual haptic generators** - Created separate UIImpactFeedbackGenerator instances for light (grab) and medium (drop) to allow both to be prepared at drag start for reduced latency.
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4. **DragContext stored in session.localContext** - Allows access to drag state across all delegate methods without relying on instance variables that could be stale.
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## Deviations from Plan
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### Implementation Structure
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**Tasks 2-3 completed as part of Task 1**
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- **Issue:** Plan assumed incremental implementation, but delegate pattern requires holistic approach
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- **Resolution:** Implemented all three tasks together in single cohesive commit
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- **Impact:** Same functionality delivered, single commit instead of three
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- **Verification:** Build succeeded, all features present (lift animation, haptics, constraints)
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---
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**Total deviations:** 1 (implementation structure)
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**Impact on plan:** No missing functionality. All DRAG-01, DRAG-06, DRAG-08 requirements implemented. Code is cleaner than artificial separation would have been.
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## Issues Encountered
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None - implementation proceeded smoothly with existing constraint validation infrastructure.
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## User Setup Required
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None - no external service configuration required.
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## Next Phase Readiness
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**Ready for Plan 04-02:**
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- Foundation for insertion line feedback established (UIDragPreviewParameters with rounded corners)
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- Constraint validation integrated (validDestinationRowsProposed checked in dropSessionDidUpdate)
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- Zone transition haptics preserved from existing code
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- Remaining work: themed insertion line, invalid zone red tint, snap-back animation
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**Requirements status after this plan:**
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- DRAG-01: Lift animation on grab - IMPLEMENTED
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- DRAG-06: Haptic feedback (light/medium) - IMPLEMENTED
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- DRAG-08: Slight tilt during drag - IMPLEMENTED
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- Foundation established for DRAG-02 through DRAG-05
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---
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*Phase: 04-drag-interaction*
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*Completed: 2026-01-18*
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