From 9e378dfed10d478aa388460cf304ac58172e8fc1 Mon Sep 17 00:00:00 2001
From: Kael <kaelwd@gmail.com>
Date: Fri, 8 Sep 2023 18:40:37 +1000
Subject: [PATCH] fix(VColorPicker): don't update color when canvas resizes

fixes #18231
---
 .../VColorPicker/VColorPickerCanvas.tsx       | 49 +++++++++----------
 .../__tests__/VColorPicker.spec.cy.tsx        |  4 +-
 2 files changed, 24 insertions(+), 29 deletions(-)

diff --git a/packages/vuetify/src/components/VColorPicker/VColorPickerCanvas.tsx b/packages/vuetify/src/components/VColorPicker/VColorPickerCanvas.tsx
index 2b3a3c9940c..88ba65d89b9 100644
--- a/packages/vuetify/src/components/VColorPicker/VColorPickerCanvas.tsx
+++ b/packages/vuetify/src/components/VColorPicker/VColorPickerCanvas.tsx
@@ -46,8 +46,26 @@ export const VColorPickerCanvas = defineComponent({
 
   setup (props, { emit }) {
     const isInteracting = shallowRef(false)
-    const isOutsideUpdate = shallowRef(false)
-    const dotPosition = ref({ x: 0, y: 0 })
+    const canvasRef = ref<HTMLCanvasElement | null>()
+    const canvasWidth = shallowRef(parseFloat(props.width))
+    const canvasHeight = shallowRef(parseFloat(props.height))
+
+    const _dotPosition = ref({ x: 0, y: 0 })
+    const dotPosition = computed({
+      get: () => _dotPosition.value,
+      set (val) {
+        if (!canvasRef.value) return
+
+        const { x, y } = val
+
+        emit('update:color', {
+          h: props.color?.h ?? 0,
+          s: clamp(x, 0, canvasWidth.value) / canvasWidth.value,
+          v: 1 - clamp(y, 0, canvasHeight.value) / canvasHeight.value,
+          a: props.color?.a ?? 1,
+        })
+      },
+    })
 
     const dotStyles = computed(() => {
       const { x, y } = dotPosition.value
@@ -60,9 +78,6 @@ export const VColorPickerCanvas = defineComponent({
       }
     })
 
-    const canvasRef = ref<HTMLCanvasElement | null>()
-    const canvasWidth = shallowRef(parseFloat(props.width))
-    const canvasHeight = shallowRef(parseFloat(props.height))
     const { resizeRef } = useResizeObserver(entries => {
       if (!resizeRef.value?.offsetParent) return
 
@@ -113,24 +128,6 @@ export const VColorPickerCanvas = defineComponent({
       window.removeEventListener('touchend', handleMouseUp)
     }
 
-    watch(dotPosition, () => {
-      if (isOutsideUpdate.value) {
-        isOutsideUpdate.value = false
-        return
-      }
-
-      if (!canvasRef.value) return
-
-      const { x, y } = dotPosition.value
-
-      emit('update:color', {
-        h: props.color?.h ?? 0,
-        s: clamp(x, 0, canvasWidth.value) / canvasWidth.value,
-        v: 1 - clamp(y, 0, canvasHeight.value) / canvasHeight.value,
-        a: props.color?.a ?? 1,
-      })
-    })
-
     function updateCanvas () {
       if (!canvasRef.value) return
 
@@ -155,7 +152,7 @@ export const VColorPickerCanvas = defineComponent({
     watch(() => props.color?.h, updateCanvas, { immediate: true })
     watch(() => [canvasWidth.value, canvasHeight.value], (newVal, oldVal) => {
       updateCanvas()
-      dotPosition.value = {
+      _dotPosition.value = {
         x: dotPosition.value.x * newVal[0] / oldVal[0],
         y: dotPosition.value.y * newVal[1] / oldVal[1],
       }
@@ -167,9 +164,7 @@ export const VColorPickerCanvas = defineComponent({
         return
       }
 
-      isOutsideUpdate.value = true
-
-      dotPosition.value = props.color ? {
+      _dotPosition.value = props.color ? {
         x: props.color.s * canvasWidth.value,
         y: (1 - props.color.v) * canvasHeight.value,
       } : { x: 0, y: 0 }
diff --git a/packages/vuetify/src/components/VColorPicker/__tests__/VColorPicker.spec.cy.tsx b/packages/vuetify/src/components/VColorPicker/__tests__/VColorPicker.spec.cy.tsx
index 7783777f430..ba89a4f6946 100644
--- a/packages/vuetify/src/components/VColorPicker/__tests__/VColorPicker.spec.cy.tsx
+++ b/packages/vuetify/src/components/VColorPicker/__tests__/VColorPicker.spec.cy.tsx
@@ -213,7 +213,7 @@ describe('VColorPicker', () => {
   it('should emit value when changing hue slider', () => {
     cy.mount(() => (
       <Application>
-        <VColorPicker modelValue="#000ff" />
+        <VColorPicker modelValue="#0000ff" />
       </Application>
     ))
 
@@ -231,7 +231,7 @@ describe('VColorPicker', () => {
   it('should emit value when changing alpha slider', () => {
     cy.mount(() => (
       <Application>
-        <VColorPicker modelValue="#000ff" />
+        <VColorPicker modelValue="#0000ff" />
       </Application>
     ))