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Highlight connected schematic nets on hover #241

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Highlight connected schematic nets on hover #241

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1dac87a
Update SchematicViewer.tsx
pawanrahul370-commits Jul 18, 2026
9abe46e
Update useSchematicNetHover.ts
pawanrahul370-commits Jul 18, 2026
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13 changes: 12 additions & 1 deletion lib/components/SchematicViewer.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -445,7 +445,18 @@ export const SchematicViewer = ({
{netHoverHighlightEnabled && (
<style>
{`.sch-net-faded { opacity: 0.35; }
svg :is(g.trace, g.trace-overlays, g[data-schematic-component-id], [data-schematic-net-label-id]) { transition: opacity 0.12s ease-in-out; }`}
.sch-net-hovered:is(g.trace, g.trace-overlays) :is(path, line, polyline) {
stroke: #f97316 !important;
stroke-opacity: 1 !important;
}
.sch-net-hovered[data-schematic-net-label-id] :is(text, path),
.sch-net-hovered[data-schematic-net-label-id] {
fill: #f97316 !important;
stroke-opacity: 1 !important;
}
svg :is(g.trace, g.trace-overlays, g[data-schematic-component-id], [data-schematic-net-label-id]) {
transition: opacity 0.12s ease-in-out, stroke 0.12s ease-in-out, fill 0.12s ease-in-out;
}`}
</style>
)}
{onSchematicComponentClicked && (
Expand Down
16 changes: 12 additions & 4 deletions lib/hooks/useSchematicNetHover.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@ import type { CircuitJson } from "circuit-json"
import { useEffect } from "react"

const FADED_CLASS = "sch-net-faded"
const HOVERED_CLASS = "sch-net-hovered"

const TRACE_SELECTOR =
"g.trace[data-subcircuit-connectivity-map-key], g.trace-overlays[data-subcircuit-connectivity-map-key]"
Expand All @@ -20,7 +21,8 @@ const NET_LABEL_SELECTOR = "[data-schematic-net-label-id]"
* - components: g[data-schematic-component-id]
* - net labels: [data-schematic-net-label-id] (per element, no wrapping group)
*
* Faded elements get the `sch-net-faded` class (styled by SchematicViewer).
* Faded elements get the `sch-net-faded` class and hovered net elements get
* the `sch-net-hovered` class (styled by SchematicViewer).
*/
export const useSchematicNetHover = ({
svgDivRef,
Expand All @@ -47,7 +49,9 @@ export const useSchematicNetHover = ({
let hoveredNetKey: string | null = null

const collectNetElements = () => {
for (const { el } of netElements) el.classList.remove(FADED_CLASS)
for (const { el } of netElements) {
el.classList.remove(FADED_CLASS, HOVERED_CLASS)
}
netElements = []
triggerNetKeys.clear()
hoveredNetKey = null
Expand Down Expand Up @@ -83,12 +87,14 @@ export const useSchematicNetHover = ({
}
}

// Fade everything not on `key` (null clears the fade).
// Fade everything not on `key` and visibly highlight elements that are on
// the hovered net (null clears both states).
const highlightNet = (key: string | null) => {
if (key === hoveredNetKey) return
hoveredNetKey = key
for (const { el, keys } of netElements) {
el.classList.toggle(FADED_CLASS, key !== null && !keys.has(key))
el.classList.toggle(HOVERED_CLASS, key !== null && keys.has(key))
}
}

Expand Down Expand Up @@ -121,7 +127,9 @@ export const useSchematicNetHover = ({
observer.disconnect()
svgDiv.removeEventListener("mouseover", handleMouseOver)
svgDiv.removeEventListener("mouseleave", handleMouseLeave)
for (const { el } of netElements) el.classList.remove(FADED_CLASS)
for (const { el } of netElements) {
el.classList.remove(FADED_CLASS, HOVERED_CLASS)
}
}
// Keyed on circuitJsonKey (content hash) rather than the circuitJson
// reference, matching the other post-render SVG hooks.
Expand Down
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