fix: address review feedback for Range editor

src/components/range/RangeEditor.vue

@@ -178,12 +178,11 @@ import { useRangeEditor } from '@/composables/useRangeEditor'
 import type { ColorStop } from '@/lib/litegraph/src/interfaces'
 import type { RangeValue } from '@/lib/litegraph/src/types/widgets'
 
-import {
-  clamp,
-  gammaToPosition,
-  normalize,
-  positionToGamma
-} from './rangeUtils'
+import { normalize } from '@/utils/mathUtil'
+
+import { clamp } from 'es-toolkit'
+
+import { gammaToPosition, positionToGamma } from './rangeUtils'
 
 const {
   display = 'plain',
@@ -214,7 +213,8 @@ const { handleTrackPointerDown, startDrag } = useRangeEditor({
   trackRef,
   modelValue,
   valueMin: toRef(() => valueMin),
-  valueMax: toRef(() => valueMax)
+  valueMax: toRef(() => valueMax),
+  showMidpoint: toRef(() => showMidpoint)
 })
 
 function onTrackPointerDown(e: PointerEvent) {

src/components/range/WidgetRange.vue

@@ -1,6 +1,6 @@
 <template>
   <RangeEditor
-    :model-value="effectiveValue.value"
+    :model-value="effectiveValue"
     :display="widget?.options?.display"
     :gradient-stops="widget?.options?.gradient_stops"
     :show-midpoint="widget?.options?.show_midpoint"
@@ -64,8 +64,8 @@ watch(upstreamValue, (upstream) => {
 
 const effectiveValue = computed(() =>
   isDisabled.value && upstreamValue.value
-    ? { value: upstreamValue.value }
-    : { value: modelValue.value }
+    ? upstreamValue.value
+    : modelValue.value
 )
 
 function onValueChange(value: RangeValue) {

src/components/range/rangeUtils.test.ts

@@ -1,38 +1,6 @@
 import { describe, expect, it } from 'vitest'
 
-import {
-  constrainRange,
-  denormalize,
-  formatMidpointLabel,
-  gammaToPosition,
-  isRangeValue,
-  normalize,
-  positionToGamma
-} from './rangeUtils'
-
-describe('normalize', () => {
-  it('normalizes value to 0-1', () => {
-    expect(normalize(128, 0, 256)).toBe(0.5)
-    expect(normalize(0, 0, 255)).toBe(0)
-    expect(normalize(255, 0, 255)).toBe(1)
-  })
-
-  it('returns 0 when min equals max', () => {
-    expect(normalize(5, 5, 5)).toBe(0)
-  })
-})
-
-describe('denormalize', () => {
-  it('converts normalized value back to range', () => {
-    expect(denormalize(0.5, 0, 256)).toBe(128)
-    expect(denormalize(0, 0, 255)).toBe(0)
-    expect(denormalize(1, 0, 255)).toBe(255)
-  })
-
-  it('round-trips with normalize', () => {
-    expect(denormalize(normalize(100, 0, 255), 0, 255)).toBeCloseTo(100)
-  })
-})
+import { gammaToPosition, isRangeValue, positionToGamma } from './rangeUtils'
 
 describe('positionToGamma', () => {
   it('converts 0.5 to gamma 1.0', () => {
@@ -60,51 +28,6 @@ describe('gammaToPosition', () => {
   })
 })
 
-describe('formatMidpointLabel', () => {
-  it('formats linear scale as decimal', () => {
-    expect(formatMidpointLabel(0.5, 'linear')).toBe('0.50')
-  })
-
-  it('formats gamma scale as gamma value', () => {
-    expect(formatMidpointLabel(0.5, 'gamma')).toBe('1.00')
-  })
-})
-
-describe('constrainRange', () => {
-  it('passes through valid range unchanged', () => {
-    const result = constrainRange({ min: 0.2, max: 0.8 })
-    expect(result).toEqual({ min: 0.2, max: 0.8, midpoint: undefined })
-  })
-
-  it('clamps values to default [0, 1]', () => {
-    const result = constrainRange({ min: -0.5, max: 1.5 })
-    expect(result.min).toBe(0)
-    expect(result.max).toBe(1)
-  })
-
-  it('clamps values to custom range', () => {
-    const result = constrainRange({ min: -10, max: 300 }, 0, 255)
-    expect(result.min).toBe(0)
-    expect(result.max).toBe(255)
-  })
-
-  it('enforces min <= max', () => {
-    const result = constrainRange({ min: 0.8, max: 0.3 })
-    expect(result.min).toBe(0.8)
-    expect(result.max).toBe(0.8)
-  })
-
-  it('preserves midpoint when present', () => {
-    const result = constrainRange({ min: 0.2, max: 0.8, midpoint: 0.5 })
-    expect(result.midpoint).toBe(0.5)
-  })
-
-  it('clamps midpoint to [0, 1]', () => {
-    const result = constrainRange({ min: 0.2, max: 0.8, midpoint: 1.5 })
-    expect(result.midpoint).toBe(1)
-  })
-})
-
 describe('isRangeValue', () => {
   it('returns true for valid range', () => {
     expect(isRangeValue({ min: 0, max: 1 })).toBe(true)

src/components/range/rangeUtils.ts

@@ -2,21 +2,8 @@ import { clamp } from 'es-toolkit'
 
 import type { RangeValue } from '@/lib/litegraph/src/types/widgets'
 
-export { clamp }
-
-export function normalize(value: number, min: number, max: number): number {
-  return max === min ? 0 : (value - min) / (max - min)
-}
-
-export function denormalize(
-  normalized: number,
-  min: number,
-  max: number
-): number {
-  return min + normalized * (max - min)
-}
-
 export function positionToGamma(position: number): number {
+  // Avoid log2(0) = -Infinity and log2(1) = 0 (division by zero in gamma)
   const clamped = clamp(position, 0.001, 0.999)
   return -Math.log2(clamped)
 }
@@ -25,28 +12,6 @@ export function gammaToPosition(gamma: number): number {
   return Math.pow(2, -gamma)
 }
 
-export function formatMidpointLabel(
-  position: number,
-  scale: 'linear' | 'gamma'
-): string {
-  if (scale === 'gamma') {
-    return positionToGamma(position).toFixed(2)
-  }
-  return position.toFixed(2)
-}
-
-export function constrainRange(
-  value: RangeValue,
-  valueMin: number = 0,
-  valueMax: number = 1
-): RangeValue {
-  const min = clamp(value.min, valueMin, valueMax)
-  const max = clamp(Math.max(min, value.max), valueMin, valueMax)
-  const midpoint =
-    value.midpoint !== undefined ? clamp(value.midpoint, 0, 1) : undefined
-  return { min, max, midpoint }
-}
-
 export function isRangeValue(value: unknown): value is RangeValue {
   if (typeof value !== 'object' || value === null || Array.isArray(value))
     return false

src/composables/useRangeEditor.ts

@@ -3,7 +3,7 @@ import type { Ref } from 'vue'
 
 import { clamp } from 'es-toolkit'
 
-import { denormalize, normalize } from '@/components/range/rangeUtils'
+import { denormalize, normalize } from '@/utils/mathUtil'
 import type { RangeValue } from '@/lib/litegraph/src/types/widgets'
 
 type HandleType = 'min' | 'max' | 'midpoint'
@@ -13,13 +13,15 @@ interface UseRangeEditorOptions {
   modelValue: Ref<RangeValue>
   valueMin: Ref<number>
   valueMax: Ref<number>
+  showMidpoint: Ref<boolean>
 }
 
 export function useRangeEditor({
   trackRef,
   modelValue,
   valueMin,
-  valueMax
+  valueMax,
+  showMidpoint
 }: UseRangeEditorOptions) {
   const activeHandle = ref<HandleType | null>(null)
   let cleanupDrag: (() => void) | null = null
@@ -28,10 +30,7 @@ export function useRangeEditor({
     const el = trackRef.value
     if (!el) return valueMin.value
     const rect = el.getBoundingClientRect()
-    const normalized = Math.max(
-      0,
-      Math.min(1, (e.clientX - rect.left) / rect.width)
-    )
+    const normalized = clamp((e.clientX - rect.left) / rect.width, 0, 1)
     return denormalize(normalized, valueMin.value, valueMax.value)
   }
 
@@ -41,7 +40,7 @@ export function useRangeEditor({
     const dMax = Math.abs(value - max)
     let best: HandleType = dMin <= dMax ? 'min' : 'max'
     const bestDist = Math.min(dMin, dMax)
-    if (midpoint !== undefined) {
+    if (midpoint !== undefined && showMidpoint.value) {
       const midAbs = min + midpoint * (max - min)
       if (Math.abs(value - midAbs) < bestDist) {
         best = 'midpoint'

src/lib/litegraph/src/types/widgets.ts

@@ -355,7 +355,6 @@ export interface IWidgetRangeOptions extends IWidgetOptions {
   midpoint_scale?: 'linear' | 'gamma'
   value_min?: number
   value_max?: number
-  histogram?: Uint32Array | null
 }
 
 export interface IRangeWidget extends IBaseWidget<

src/utils/mathUtil.test.ts

@@ -1,9 +1,39 @@
 import { describe, expect, it } from 'vitest'
 
 import type { ReadOnlyRect } from '@/lib/litegraph/src/interfaces'
-import { computeUnionBounds, gcd, lcm } from '@/utils/mathUtil'
+import {
+  computeUnionBounds,
+  denormalize,
+  gcd,
+  lcm,
+  normalize
+} from '@/utils/mathUtil'
 
 describe('mathUtil', () => {
+  describe('normalize', () => {
+    it('normalizes value to 0-1', () => {
+      expect(normalize(128, 0, 256)).toBe(0.5)
+      expect(normalize(0, 0, 255)).toBe(0)
+      expect(normalize(255, 0, 255)).toBe(1)
+    })
+
+    it('returns 0 when min equals max', () => {
+      expect(normalize(5, 5, 5)).toBe(0)
+    })
+  })
+
+  describe('denormalize', () => {
+    it('converts normalized value back to range', () => {
+      expect(denormalize(0.5, 0, 256)).toBe(128)
+      expect(denormalize(0, 0, 255)).toBe(0)
+      expect(denormalize(1, 0, 255)).toBe(255)
+    })
+
+    it('round-trips with normalize', () => {
+      expect(denormalize(normalize(100, 0, 255), 0, 255)).toBeCloseTo(100)
+    })
+  })
+
   describe('gcd', () => {
     it('should compute greatest common divisor correctly', () => {
       expect(gcd(48, 18)).toBe(6)

src/utils/mathUtil.ts

@@ -1,4 +1,23 @@
 import type { ReadOnlyRect } from '@/lib/litegraph/src/interfaces'
+
+/**
+ * Linearly maps a value from [min, max] to [0, 1].
+ * Returns 0 when min equals max to avoid division by zero.
+ */
+export function normalize(value: number, min: number, max: number): number {
+  return max === min ? 0 : (value - min) / (max - min)
+}
+
+/**
+ * Linearly maps a normalized value from [0, 1] back to [min, max].
+ */
+export function denormalize(
+  normalized: number,
+  min: number,
+  max: number
+): number {
+  return min + normalized * (max - min)
+}
 import type { Bounds } from '@/renderer/core/layout/types'
 
 /** Simple 2D point or size as [x, y] or [width, height] */