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Chart theming: selectable chart theme + spec↔config merge/extract

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Oleh Omelchenko
2026-06-12 16:48:48 +03:00
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docs/spec/04-live-preview.md
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@@ -36,6 +36,21 @@ Behavior of the selected mode:
- The selected mode persists across sessions, stored in _Settings_ as `previewFitMode`.
- The default is the natural Original mode.
## Chart theme
The preview pane header carries a **Chart theme** picker — a value-select disclosure choosing which Vega-Lite config is injected when charts render:
- **Astrolabe** (default) — the house style; follows the app's light/dark theme.
- **Stock Vega-Lite** — injects nothing; charts render exactly as plain Vega-Lite defaults would anywhere else (white background, default palette and fonts).
- **Presets** — the `vega-themes` preset configs (Excel, ggplot2, FiveThirtyEight, LA Times, Power BI, the Carbon family, …), rendered verbatim and independent of the app's light/dark theme.
Behavior:
- The choice is a **global preference**, not per-snippet; it persists across sessions, stored in _Settings_ as `ui.chartTheme`.
- The injected config applies at render time only — it is never written into the snippet's stored spec. A spec's own `config` block overrides the injected config property by property, so a snippet can opt out of any part of it locally (see also _Spec Editor → Spec ↔ config actions_).
- Image export reflects the selected theme: exports render from the same themed view.
- The Chart Builder preview and onboarding thumbnails are app surfaces and stay house-styled regardless of this choice.
## Export control
The preview pane header also carries a per-chart **Export** control — a disclosure for copying or downloading the current chart's spec, or downloading its rendered image (PNG/SVG). It exports what the preview shows. The behavior is specified in _Import & Export → Per-chart export_; it lives in this header because the image formats are produced from the live rendered view.