spboyer/slidemaker/sidebar-list-polish

Context

Sidebar list panels (slide lists, file trees, layer panels) often start utilitarian and need polish. These patterns transform a basic list into a professional, designed panel.

Patterns

Icons Over Unicode

Replace unicode symbols (↑↓✕←→) with inline SVG components. Unicode renders inconsistently across OS/browser combos and looks unpolished. Inline SVGs are 5-7 lines each, need no icon library, and render crisply at any size.

Hover-Reveal Actions

Wrap list items in a Tailwind group class. Place action buttons as absolute positioned elements with opacity-0 group-hover:opacity-100 transition-opacity. This keeps the list clean while making actions discoverable. For the selected/active item, always show buttons (opacity-100).

Selected State Hierarchy

A single background highlight (bg-indigo-600/20) is not visually distinct enough. Use three signals together:

1. Left accent bar — absolute left-0 w-[3px] rounded-full bg-indigo-400
2. Ring border — ring-1 ring-indigo-500/30
3. Background — bg-indigo-500/15

Mini Thumbnails

For list items that represent visual content (slides, pages, cards), add a small preview area. Even a simple colored box with a number or icon is better than text-only. Use cycling accent colors for visual variety.

Panel Open/Close Transitions

Never conditionally render ({show && <Panel />}) — it causes a hard mount/unmount cut. Instead, always render the panel and control with CSS: w-64 ↔ w-0 with transition-all duration-200 overflow-hidden. The inner content should have a fixed width matching the open state.

Anti-Patterns

• Icon libraries for < 5 icons — inline SVG is lighter and avoids dependency
• Conditional rendering for panel visibility — use CSS transitions
• Single-signal selected state — combine accent bar + ring + background
• Always-visible action buttons — creates visual noise at scale