yayacal/CHANGELOG.md

Changelog

All notable changes to the YaYa project are documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

1.0.0 - 2026-05-20

Added

Project Foundation

• Kotlin Multiplatform project setup targeting Android and iOS with Compose Multiplatform
• Two-module architecture: :shared (UI + business logic) and :androidApp (thin Android shell)
• AGP 9.2.1, Gradle 9.5.1, Kotlin 2.3.21, JVM target 17
• Compile SDK / target SDK 37, minimum SDK 24
• Version catalog at gradle/libs.versions.toml
• Dynamic version name generation: baseVersion + git hash + buildDate

Calendar Core Views

• Month View: 6x7 day grid with dynamic row count (4/5/6 weeks) based on actual month shape
• Week View: Single-week horizontal pager activated by collapsing the month view
• Year View: 4x3 mini-month grid with swipe-based year navigation and Hero Zoom transition
• Infinite Paging: Int.MAX_VALUE virtual pages centered at Int.MAX_VALUE / 2, enabling boundless month/week/year navigation
• ISO 8601 week numbering with Monday as the first day of the week
• Today indicator with border outline; selected-today state uses primaryContainer for softer visual treatment
• Non-current-month days are grayed out for visual clarity
• Auto-select today (if within range) or first day / Monday on page changes
• Click month header to jump back to today
• Cross-month week selection: intelligently selects the appropriate date based on swipe direction

Collapse / Expand Animation

• Drag-driven month-to-week collapse gesture on the calendar grid
• Spring-based snap animation that auto-settles to the nearest state on release
• Two-phase whole-block slide-up collapse animation with fade-out for non-selected rows
• Dynamic drag range computed from actual visual height change for 1:1 finger tracking
• Fling velocity threshold (800 dp/s) for quick swipe snap
• Collapse threshold set to 8% for easy fold/unfold triggering
• Pull-down gesture to expand from collapsed week view back to month view
• Week pager cross-fade transition to eliminate blank gaps during page switches

Chinese Calendar (Lunar)

• Lunar date display below each day number (using tyme4kt), showing month name on the first day of each lunar month
• Twenty-four solar terms (节气) annotations
• Traditional lunar festivals (春节, 端午, 中秋, etc.)
• Western solar festivals
• Legal holiday and compensatory workday badges (休/班) in the top-right corner
• Priority-based annotation display: legal holidays > lunar festivals > solar terms > solar festivals > lunar day

Personal Shift Scheduling

• ShiftPattern data model with anchor date + cyclic sequence for periodic work/rest schedules
• Independent from public holidays
• Work/Rest capsule badge display on DayCell
• Configurable legal holiday overlay toggle (default off)
• Shift status tips in the bottom card

Visual Design & Animations

• Material 3 dynamic color scheme
• System dark theme support with automatic light/dark ColorScheme switching
• DayCell circular reveal animation with updateTransition for smooth state transitions
• Month header slide + fade transition when month/week number changes
• Page fade-in/fade-out transitions on CalendarPager and WeekPager
• GIF elastic entrance animation on switch
• 152 GIF assets displayed randomly based on selected date seed
• Custom app icon resources for all densities and platforms (PNG + WebP)

Bottom Card

• Draggable bottom info card with drag handle
• Selected date relative day description (今天, 昨天, 明天, N天前/后)
• Gregorian and lunar date details
• Shift status tips (WORK / OFF)
• Random GIF display (140dp height)

Navigation & Pages

• About screen with app icon, name, dynamic version, and open-source license entry
• Licenses screen listing all third-party dependency licenses
• Floating Action Button (FAB) with zoom-animated menu and scrim close
• Page navigation with direction-aware slide + fade transitions
• Android 13+ Predictive Back gesture with follow-finger displacement/scale animation
• BackHandler expect/actual for cross-platform back gesture interception

Performance Optimizations

• ComposeTrace cross-platform trace markers for Perfetto / Systrace analysis
• graphicsLayer(translationY) replacing offset(Dp) to avoid per-frame layout passes
• SolarDay static cache to eliminate repeated object creation during pager switches
• MiniMonth pure Canvas rendering: eliminated 96 Text component measurement overhead
• Year view / month view coexistence in composition tree with Modifier.alpha control (avoiding whole-tree destruction)
• Precomputed dp-to-px conversions and TextLayoutResult caches
• Pager cache optimized (beyondViewportPageCount = 0)

Build & Testing

• R8 code shrinking and resource optimization with ProGuard rules
• ABI filtering (arm64-v8a, armeabi-v7a)
• App Bundle language/density/ABI splits
• Unit tests for CalendarViewModel, CalendarUtils, and ShiftPattern
• kotlinx-coroutines-test for coroutine-based ViewModel testing
• ComposeTrace host test fallback (silently ignores when Trace API is not stubbed)

Documentation

• CLAUDE.md with project architecture, conventions, and build commands
• DEVELOPMENT.md with setup, build, test, and Perfetto trace analysis guide
• COMMENTS.md with commenting and KDoc conventions
• README.md with feature overview and tech stack

Changed

• Row padding increased from 4dp to 6dp for better touch targets
• Selected-state animation duration reduced from 250ms to 150ms for snappier feedback
• Weekday header moved out of pager to remain fixed across page swipes
• Card gap spacing animates with collapse progress (24dp expanded → 12dp collapsed)
• Year view title bar displays lunar干支+生肖 year (e.g., 「丙午马年」) with a "今年" button for quick return
• FAB fixed to bottom-left of screen instead of tracking BottomCard height
• Menu scrim changed to fully transparent without fade animation

Fixed

• First-frame flicker by deferring row height until measured
• Calendar height jitter when collapsing to week view
• Swipe interpolation discontinuity during month transitions
• Collapse drag not tracking finger (now uses dynamic dragRange)
• BottomCard positioning during collapse animation
• Flash when expanding after navigating months in collapsed state
• Week number baseline alignment stability during AnimatedContent transitions
• Year view stale year display on enter
• Year view missing scale animation on first launch
• "Today" button title bar jitter: replaced conditional rendering with alpha fade
• Folded state cross-month date not grayed out in week view
• Theme switching transparency issues by adding explicit background colors
• Predictive back gesture failure and end-of-animation flash on certain devices
• Back animation residual transition eliminated with snapTo
• Icon colors now adapt to MaterialTheme instead of hardcoded white

Removed

• MonthHeader click-to-toggle-year-view (replaced by FAB menu)
• Year view arrow navigation (replaced by swipe gesture)
• Shift badge background circle for lighter visual weight
• Default ripple effect on DayCell (replaced by circular reveal animation)
• Aliyun Maven mirrors (switched back to Maven Central / Google)
• Unused Compose runtime ProGuard keep rules

1.1.0 - 2026-06-02

Added

Date Checker Tool

• New "Date Checker" tool page accessible from FAB → Tools menu for tracking item expiration dates
• Swipe-to-delete with animated removal and staggered enter/exit animations
• Expired status display with visual indicators
• Auto-scroll and highlight animation for new entries

Tools Page

• New "Tools" entry in FAB menu linking to a dedicated tools landing page
• Date Checker as the first tool module

Theme & Visual

• YaYaTheme introduced and applied to all Activities for unified theming
• Legal holiday badges now display with colored background and continuous edge rounded corners
• Holiday badge wave-scale entrance animation
• Personal shift badges redesigned with light circle background + centered text
• Shift badge circular base to avoid overlapping with selection ring

Year ↔ Month View Transition

• BottomCard slide-in animation and fade effect during year/month view transitions
• Month→year view no longer forces collapse state to expand

Performance

• LunarCache LRU cache for lunar/solar term calculations with startup pre-computation
• Macrobenchmark module with automated Baseline Profile generation
• Baseline Profile covering date checker, shift settings, tools page, and core calendar scenarios
• ComposeTrace cross-platform trace markers for Perfetto/Systrace
• SolarDay static cache to eliminate repeated object creation
• MiniMonth pure Canvas rendering eliminating 96 Text measurement overhead
• graphicsLayer(translationY) replacing offset(Dp) to avoid layout passes
• Aggregated CalendarUiState to reduce Compose recomposition
• remember stabilization for lambdas and computations
• Scene-based profile.sh with --all batch mode for 15 automated trace scenarios
• Perfetto trace analysis script (analyze-trace.sh)
• Trace build type for release + retained trace markers

Build & Tooling

• Spotless 8.5.1 code formatter with ktlint integration
• .editorconfig for ktlint Composable function naming rules
• Dependency update checker and auto-upgrade tool integration
• app_icon shrunk to 512×512 and converted to WebP (446KB savings)
• 152 GIF assets batch-converted to animated WebP format
• uiTooling moved to debugImplementation; unused @Preview and kotlin-test entries removed
• sketch library for GIF/WebP display (sketch-compose + sketch-animated-webp)
• PowerShell performance tracing script (profile.ps1)

Documentation

• Comprehensive AGENTS.md at every directory level (root, app, core, scripts, etc.)
• Updated DEVELOPMENT.md with Perfetto trace analysis and emulator launch commands
• Updated CLAUDE.md to reflect pure Android project structure

Changed

• Project migrated from Kotlin Multiplatform (KMP/CMP) to pure Android (:app + :core)
• All Compose UI and business logic consolidated into :core module; :app remains a thin shell
• Removed KMP/CMP plugins, iOS app module, and :shared module
• androidApp module renamed to app
• Collapse animation refactored: removed fling velocity threshold, now spring-driven
• CalendarPager ↔ WeekPager switching uses AnimatedContent for smooth crossfade
• Year view page year calculation uses settledPage to prevent flicker during swipe
• ViewModel decoupled from Compose runtime, migrated to StateFlow
• LunarCache made injectable with extracted repeated computations
• MenuItem and ToolItem unified to use Card(onClick) pattern
• Holiday badge null checks simplified to Elvis operator
• @Suppress annotations cleaned up with deprecated API replacements
• Removed unnecessary P0 code (custom combine, dead StateFlow, duplicate grid algorithms, runBlocking)
• Removed debug logging from LicensesScreen and BottomCard

Fixed

• Lunar first-day month name no longer appends redundant "月" suffix
• Year view stale year display on enter
• Year view page year flicker during swipe transitions
• Collapse animation flicker when switching between CalendarPager and WeekPager
• Folded state cross-month dates not grayed out in week view
• Date checker swipe-to-delete state misalignment and deprecation warning
• Shared element transition animation loss after year view page change
• Night mode theme transparency issues with explicit background colors
• Predictive back gesture failure and end-of-animation flash on certain devices
• Back animation residual transition eliminated with snapTo
• Fast swipe collapse/expand failure, now uses progress threshold detection
• graphicsLayer optimization reverted due to excessive GPU compositing overhead on real devices
• Reverted shared element transitions in favor of zoom + fade animation

Removed

• iOS app module (iosApp/) and all related Xcode project files
• :shared module and shared/build.gradle.kts
• Shared element transition animations (replaced by zoom + fade)
• Year/month scroll wheel picker with haptic feedback (reverted)
• Aliyun Maven mirrors (switched to Maven Central / Google)
• Unused Compose runtime ProGuard keep rules
• Temporary performance monitoring logs (trace markers retained)

[Unreleased]

• No unreleased changes at this time.

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