Category browser¶
The Categories screen lets you browse the Part-DB category hierarchy as a tree and drill down to the list of parts in a selected category.
Tree interface¶
- ▶ – collapsed category; tap to expand
- ▼ – expanded category; tap the arrow to collapse
- ─ – category with no subcategories; tap the name to see its parts
Tapping a category name (not the arrow) opens the list of parts in that category.
Parts list in a category¶
The _CategoryPartsPage screen shows:
- All parts assigned directly to the selected category
- Alphabetical sorting by name
- A ⚠ icon next to low-stock parts
- Tapping an item opens the Part details
Loading categories
All categories are fetched once on first entry to the tab (max 200 entries, Hydra pagination). The categories are cached in memory for the session.
Technical details¶
Categories are fetched through:
The app tracks which tree nodes are expanded (Set<int> _expandedIds) and renders the list recursively. Each indentation level is offset by 16 px.