Implementation:TobikoData Sqlmesh LoadingIcon
| Knowledge Sources | |
|---|---|
| Domains | Web_UI, Components |
| Last Updated | 2026-02-07 20:00 GMT |
Overview
An animated SVG loading spinner with twelve rotating bars that fade in sequence.
Description
The LoadingIcon component renders an SVG spinner with 12 rectangular bars arranged in a circle, each rotated 30 degrees from the previous one. The animation uses SVG animate elements to create a sequential fade effect, with each bar animating from opacity 1 to 0.1 over 1 second. The bars are staggered by approximately 83 milliseconds each, creating a smooth rotating appearance. The icon defaults to 16x16 pixels (h-4 w-4) but can be customized through className. The component is built as a forwardRef to support ref attachment.
Usage
Use LoadingIcon to indicate loading or processing states in the UI. The animation runs indefinitely and requires no JavaScript for animation logic since it uses native SVG animation features. The icon inherits fill color from its parent, making it themeable through CSS.
Code Reference
Source Location
- Repository: TobikoData_Sqlmesh
- File: web/common/src/components/LoadingContainer/LoadingIcon.tsx
Signature
export const LoadingIcon = React.forwardRef<
SVGSVGElement,
React.SVGProps<SVGSVGElement>
>(({ className, ...props }, ref) => {
// Implementation
})
Import
import { LoadingIcon } from '@sqlmesh-common/components/LoadingContainer/LoadingIcon'
I/O Contract
Inputs
| Name | Type | Required | Description |
|---|---|---|---|
| className | string | No | Additional CSS classes for sizing and styling |
| ref | React.Ref<SVGSVGElement> | No | Forward ref to SVG element |
| ...props | React.SVGProps<SVGSVGElement> | No | All standard SVG attributes |
Outputs
| Name | Type | Description |
|---|---|---|
| element | React.ReactElement | Animated SVG spinner icon |
Usage Examples
// Default size (16x16)
<LoadingIcon />
// Custom size
<LoadingIcon className="h-8 w-8" />
// With color inheritance
<div className="text-blue-500">
<LoadingIcon /> {/* Will be blue */}
</div>
// Large loading spinner
<LoadingIcon className="h-16 w-16 text-gray-600" />
// In a button
<button className="flex items-center gap-2">
<LoadingIcon className="h-4 w-4" />
Loading...
</button>
// With ref
const iconRef = useRef<SVGSVGElement>(null)
<LoadingIcon ref={iconRef} />
// Custom styling
<LoadingIcon
className="h-6 w-6 opacity-50"
style={{ filter: 'drop-shadow(0 0 2px currentColor)' }}
/>
Technical Details
Animation Configuration
The icon uses 12 bars with the following animation timing:
- Duration: 1 second per cycle
- Stagger delay: 83.3ms between bars (1000ms / 12 bars)
- Rotation: 30-degree increments (360° / 12 bars)
- Opacity range: 1.0 (fully visible) to 0.1 (nearly transparent)
- Repeat: Indefinite
Bar positions start at 0° (top) and proceed clockwise at: 0°, 30°, 60°, 90°, 120°, 150°, 180°, 210°, 240°, 270°, 300°, 330°.