---
phase: 27-component-library
plan: 02
subsystem: ui
tags: css, dom, createEl, dashboard, obsidian-plugin, lifecycle-stepper, health-matrix, maturity-gauge, bar-chart

# Dependency graph
requires:
  - phase: 27-01
    provides: CSS classes for lifecycle stepper, health matrix, maturity gauge, bar chart, loading skeleton, metric progress bar
provides:
  - Loading skeleton utility (_renderSkeleton) and empty state (_renderEmptyState) for all components
  - Metric progress bar helper (_buildMetricBar) for visual coverage ratios
  - Enhanced _renderStats with null-data guard and Formal Notes progress bar
  - Lifecycle stepper (_renderLifecycleStepper) with 6-stage completed/current/pending states
  - Health matrix (_renderHealthMatrix) with 2x2 color-coded grid and tooltip titles
  - Maturity gauge (_renderMaturityGauge) with 6-segment level and blocking checks
  - Bar chart (_renderBarChart) with lifecycle-proportional horizontal bars
affects:
  - phase: 28-dashboard-shell-context-detection
  - phase: 29-per-paper-view
  - phase: 30-collection-view

# Tech tracking
tech-stack:
  added: []
  patterns: Loading skeleton via addClass/removeClass on parent container, metric progress bar as sub-card element, 6-stage lifecycle classification, 2x2 health status grid, proportional horizontal bar charts

key-files:
  created: []
  modified:
    - paperforge/plugin/main.js

key-decisions:
  - "Status classes (ok/warn/fail) applied via variable `statusClass` rather than hardcoded literal in _renderHealthMatrix -- enables DRY handling of healthy/warning/failed status values"
  - "Bar fill CSS classes use template literal for dynamic stage color: `cls: \`bar-fill ${stage.cls}\`` -- matches Plan 27-01 color variant selectors"
  - "All 5 new render methods guard against null/undefined input: _renderSkeleton for most, _renderEmptyState for bar chart (which renders more gracefully with 'No lifecycle data')"
  - "Unicode icons in health matrix use JS escape sequences (\u2713, \u26A0, \u2717) stored as string literals -- consistent with pre-existing patterns in main.js"

patterns-established:
  - "All render methods accept data as first argument (or container + data for non-self-rendering)"
  - "Skeleton loading state: addClass('paperforge-loading') to container; removeClass when data arrives"
  - "Lifecycle stages use consistent 6-stage schema: imported, indexed, pdf_ready, fulltext_ready, deep_read, ai_ready"
  - "Bar chart uses max-count normalization for proportional widths (Math.max(1, ...))"

requirements-completed:
  - COMP-01
  - COMP-03

# Metrics
duration: 3 min
completed: 2026-05-04
---

# Phase 27 Plan 02: Render Methods Summary

**5 new DOM render methods on PaperForgeStatusView: loading skeleton utilities, enhanced metric cards, 6-stage lifecycle stepper, 2x2 health matrix, 6-segment maturity gauge, and lifecycle-proportional bar chart -- all using createEl() DOM API with CSS classes from Plan 27-01**

## Performance

- **Duration:** 3 min
- **Started:** 2026-05-04T06:38:48Z
- **Completed:** 2026-05-04T06:41:48Z
- **Tasks:** 3
- **Files modified:** 1

## Accomplishments

- Added `_renderSkeleton(container)` and `_renderEmptyState(container, message)` utilities used by all render methods for graceful null/empty data handling
- Added `_buildMetricBar(card, value, max)` helper for optional progress sub-bar on metric cards
- Enhanced `_renderStats(d)` with null-data guard (renders skeleton), "Formal Notes" label, and progress bar showing formal_notes / total_papers coverage ratio
- Added `_renderLifecycleStepper(container, lifecycle, currentStage)` -- renders 6 stages (Imported, Indexed, PDF Ready, Fulltext Ready, Deep Read, AI Ready) with correct `.completed`/`.current`/`.pending` CSS classes
- Added `_renderHealthMatrix(container, health)` -- renders 2x2 grid with PDF/OCR/Note/Asset health cells, unicode status icons, `.ok`/`.warn`/`.fail` classes, and `title` attribute tooltips
- Added `_renderMaturityGauge(container, maturityLevel, blockingChecks)` -- renders 6-segment gauge with `.filled`/`.level-N` classes, level number, and blocking checks list
- Added `_renderBarChart(container, lifecycleCounts)` -- renders horizontal bars proportional to max count with lifecycle stage color classes
- All methods use `createEl()` DOM API -- no innerHTML in new code (only 2 pre-existing occurrences remain)
- All CSS class names match Plan 27-01 definitions exactly

## Task Commits

All 3 tasks were executed atomically in a single file:

1. **Task 1: Loading skeleton utility + enhanced _renderStats + _buildMetricBar** - `54582d2`
2. **Task 2: Lifecycle stepper + health matrix render methods** - `54582d2`
3. **Task 3: Maturity gauge + bar chart render methods** - `54582d2`

**Plan metadata:** `54582d2`

_Note: All 3 tasks modified the same file (paperforge/plugin/main.js), sharing one commit hash._

## Files Created/Modified

- `paperforge/plugin/main.js` - Added 7 methods to PaperForgeStatusView class (182 insertions, 5 deletions): `_renderSkeleton`, `_renderEmptyState`, `_buildMetricBar`, enhanced `_renderStats`, `_renderLifecycleStepper`, `_renderHealthMatrix`, `_renderMaturityGauge`, `_renderBarChart`. Existing `_renderStats` replaced with enhanced version.

## Decisions Made

- Used JS string literal escape sequences for unicode (consistent with existing code in main.js)
- Bar chart returns empty state ("No lifecycle data") rather than skeleton when data is empty -- more informative for the user
- Maturity gauge clamps level to 1-6 range with Math.round, Math.max/Math.min guards

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

- Python verification scripts on Windows needed `encoding='utf-8'` to read main.js (UnicodeDecodeError with default GBK codec)
- Some verification assertions needed adjustment to match actual code patterns (template literals vs string literals for CSS class names, variable-based status class assignment)

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness

Ready for Phase 28 (Dashboard Shell & Context Detection) which will call these render methods with concrete data:

- `_renderLifecycleStepper` for per-paper lifecycle visualization
- `_renderHealthMatrix` for overall system health overview
- `_renderMaturityGauge` for maturity assessment display
- `_renderBarChart` for lifecycle distribution charts
- Enhanced `_renderStats` for metric card coverage ratios

---

*Phase: 27-component-library*
*Completed: 2026-05-04*
