init claude-code

components/Spinner/useStalledAnimation.ts

@@ -0,0 +1,75 @@
+import { useRef } from 'react'
+
+// Hook to handle the transition to red when tokens stop flowing.
+// Driven by the parent's animation clock time instead of independent intervals,
+// so it slows down when the terminal is blurred.
+export function useStalledAnimation(
+  time: number,
+  currentResponseLength: number,
+  hasActiveTools = false,
+  reducedMotion = false,
+): {
+  isStalled: boolean
+  stalledIntensity: number
+} {
+  const lastTokenTime = useRef(time)
+  const lastResponseLength = useRef(currentResponseLength)
+  const mountTime = useRef(time)
+  const stalledIntensityRef = useRef(0)
+  const lastSmoothTime = useRef(time)
+
+  // Reset timer when new tokens arrive (check actual length change)
+  if (currentResponseLength > lastResponseLength.current) {
+    lastTokenTime.current = time
+    lastResponseLength.current = currentResponseLength
+    stalledIntensityRef.current = 0
+    lastSmoothTime.current = time
+  }
+
+  // Derive time since last token from animation clock
+  let timeSinceLastToken: number
+  if (hasActiveTools) {
+    timeSinceLastToken = 0
+    lastTokenTime.current = time
+  } else if (currentResponseLength > 0) {
+    timeSinceLastToken = time - lastTokenTime.current
+  } else {
+    timeSinceLastToken = time - mountTime.current
+  }
+
+  // Calculate stalled intensity based on time since last token
+  // Start showing red after 3 seconds of no new tokens (only when no tools are active)
+  const isStalled = timeSinceLastToken > 3000 && !hasActiveTools
+  const intensity = isStalled
+    ? Math.min((timeSinceLastToken - 3000) / 2000, 1) // Fade over 2 seconds
+    : 0
+
+  // Smooth intensity transition driven by animation frame ticks
+  if (!reducedMotion && (intensity > 0 || stalledIntensityRef.current > 0)) {
+    const dt = time - lastSmoothTime.current
+    if (dt >= 50) {
+      const steps = Math.floor(dt / 50)
+      let current = stalledIntensityRef.current
+      for (let i = 0; i < steps; i++) {
+        const diff = intensity - current
+        if (Math.abs(diff) < 0.01) {
+          current = intensity
+          break
+        }
+        current += diff * 0.1
+      }
+      stalledIntensityRef.current = current
+      lastSmoothTime.current = time
+    }
+  } else {
+    stalledIntensityRef.current = intensity
+    lastSmoothTime.current = time
+  }
+
+  // When reducedMotion is enabled, use instant intensity change
+  const effectiveIntensity = reducedMotion
+    ? intensity
+    : stalledIntensityRef.current
+
+  return { isStalled, stalledIntensity: effectiveIntensity }
+}