Update SetCSSLengthCommand to read from StyleInfo (#6651)

## Problem
The flex section relies on the `SetCSSLengthCommand` command to update
elements, both for reading and writing styles. In order for that to work
in Tailwind projects, where elements don't have an inline style prop,
`SetCSSLengthCommand` needs to read element styles from the "right"
property, otherwise the command wouldn't work as intended.

## Fix
Use the StyleInfo system from to read the element style info.

Details
- Refactored `SetCSSLengthCommand` to read elements styles through
styleInfo
- Created a bespoke prop, `CSSLengthProperty`, to track which props are
addressed by `SetCSSLengthCommand`. This way it's easy to tell which
props need to be supported by StyleInfo to have `SetCSSLengthCommand`
working well
- Extended StyleInfo to support `zIndex` (all other props in
`CSSLengthProperty` were already supported by `StyleInfo`
- Updated the style plugins to support the new StyleInfo props
- update the signatures of `fixlengthCommand` and
`getCSSNumberFromStyleInfo` to use narrower type for some of their
arguments

**Manual Tests:**
I hereby swear that:

- [x] I opened a hydrogen project and it loaded
- [x] I could navigate to various routes in Play mode

editor/src/components/canvas/canvas-strategies/strategies/group-helpers.ts

@@ -5,7 +5,7 @@ import {
   trueUpChildrenOfGroupChanged,
 } from '../../../../components/editor/store/editor-state'
 import { getLayoutProperty } from '../../../../core/layout/getLayoutProperty'
-import type { StyleLayoutProp } from '../../../../core/layout/layout-helpers-new'
+import type { LayoutPinnedProp, StyleLayoutProp } from '../../../../core/layout/layout-helpers-new'
 import type { PropsOrJSXAttributes } from '../../../../core/model/element-metadata-utils'
 import {
   MetadataUtils,
@@ -551,7 +551,7 @@ export function isEmptyGroup(metadata: ElementInstanceMetadataMap, path: Element
   )
 }
 
-function fixLengthCommand(path: ElementPath, prop: StyleLayoutProp, size: number): CanvasCommand {
+function fixLengthCommand(path: ElementPath, prop: LayoutPinnedProp, size: number): CanvasCommand {
   return setCssLengthProperty(
     'always',
     path,

editor/src/components/canvas/canvas-types.ts

@@ -586,6 +586,7 @@ export type HeightInfo = CSSStyleProperty<CSSNumber>
 export type FlexBasisInfo = CSSStyleProperty<CSSNumber>
 export type PaddingInfo = CSSStyleProperty<CSSPadding>
 export type PaddingSideInfo = CSSStyleProperty<CSSNumber>
+export type ZIndexInfo = CSSStyleProperty<CSSNumber>
 
 export interface StyleInfo {
   gap: FlexGapInfo | null
@@ -602,6 +603,7 @@ export interface StyleInfo {
   paddingRight: PaddingSideInfo | null
   paddingBottom: PaddingSideInfo | null
   paddingLeft: PaddingSideInfo | null
+  zIndex: ZIndexInfo | null
 }
 
 const emptyStyleInfo: StyleInfo = {
@@ -619,6 +621,7 @@ const emptyStyleInfo: StyleInfo = {
   paddingRight: null,
   paddingBottom: null,
   paddingLeft: null,
+  zIndex: null,
 }
 
 export const isStyleInfoKey = (key: string): key is keyof StyleInfo => key in emptyStyleInfo

editor/src/components/canvas/commands/adjust-css-length-command.ts

@@ -16,7 +16,7 @@ import type { StyleInfo } from '../canvas-types'
 
 export type CreateIfNotExistant = 'create-if-not-existing' | 'do-not-create-if-doesnt-exist'
 
-type LengthProperty = 'left' | 'right' | 'bottom' | 'top' | 'width' | 'height' | 'flexBasis'
+export type LengthProperty = 'left' | 'right' | 'bottom' | 'top' | 'width' | 'height' | 'flexBasis'
 
 type LengthPropertyPath = PropertyPath<['style', LengthProperty]>
 

editor/src/components/canvas/commands/set-css-length-command.ts

@@ -1,34 +1,26 @@
 import { notice } from '../../../components/common/notice'
-import { isLeft, isRight, left } from '../../../core/shared/either'
 import * as EP from '../../../core/shared/element-path'
-import {
-  emptyComments,
-  isJSXElement,
-  jsExpressionValue,
-} from '../../../core/shared/element-template'
-import type { GetModifiableAttributeResult, ValueAtPath } from '../../../core/shared/jsx-attributes'
-import {
-  getModifiableJSXAttributeAtPath,
-  jsxSimpleAttributeToValue,
-} from '../../../core/shared/jsx-attribute-utils'
 import { roundTo } from '../../../core/shared/math-utils'
 import type { ElementPath, PropertyPath } from '../../../core/shared/project-file-types'
 import * as PP from '../../../core/shared/property-path'
-import type { EditorState, EditorStatePatch } from '../../editor/store/editor-state'
-import { withUnderlyingTargetFromEditorState } from '../../editor/store/editor-state'
+import type { EditorState } from '../../editor/store/editor-state'
 import type { CSSKeyword, CSSNumber, FlexDirection } from '../../inspector/common/css-utils'
 import {
   cssPixelLength,
-  parseCSSPercent,
   printCSSNumber,
   printCSSNumberOrKeyword,
 } from '../../inspector/common/css-utils'
-import type { CreateIfNotExistant } from './adjust-css-length-command'
-import { deleteConflictingPropsForWidthHeight } from './adjust-css-length-command'
+import type { LengthProperty } from './adjust-css-length-command'
+import {
+  deleteConflictingPropsForWidthHeight,
+  type CreateIfNotExistant,
+} from './adjust-css-length-command'
 import type { BaseCommand, CommandFunctionResult, WhenToRun } from './commands'
 import { addToastPatch } from './show-toast-command'
-import { applyValuesAtPath } from './utils/property-utils'
+import { getCSSNumberFromStyleInfo } from './utils/property-utils'
 import type { InteractionLifecycle } from '../canvas-strategies/canvas-strategy-types'
+import type { StyleUpdate } from '../plugins/style-plugins'
+import { getActivePlugin, runStyleUpdateForStrategy } from '../plugins/style-plugins'
 
 type CssNumberOrKeepOriginalUnit =
   | { type: 'EXPLICIT_CSS_NUMBER'; value: CSSNumber | CSSKeyword }
@@ -45,10 +37,13 @@ export function setValueKeepingOriginalUnit(
   return { type: 'KEEP_ORIGINAL_UNIT', valuePx: valuePx, parentDimensionPx: parentDimensionPx }
 }
 
+type CSSLengthProperty = LengthProperty | 'zIndex'
+type CSSLengthPropertyPath = PropertyPath<['style', CSSLengthProperty]>
+
 export interface SetCssLengthProperty extends BaseCommand {
   type: 'SET_CSS_LENGTH_PROPERTY'
   target: ElementPath
-  property: PropertyPath
+  property: CSSLengthPropertyPath
   value: CssNumberOrKeepOriginalUnit
   parentFlexDirection: FlexDirection | null
   createIfNonExistant: CreateIfNotExistant
@@ -58,7 +53,7 @@ export interface SetCssLengthProperty extends BaseCommand {
 export function setCssLengthProperty(
   whenToRun: WhenToRun,
   target: ElementPath,
-  property: PropertyPath,
+  property: CSSLengthPropertyPath,
   value: CssNumberOrKeepOriginalUnit,
   parentFlexDirection: FlexDirection | null,
   createIfNonExistant: CreateIfNotExistant = 'create-if-not-existing', // TODO remove the default value and set it explicitly everywhere
@@ -90,33 +85,22 @@ export const runSetCssLengthProperty = (
     command.parentFlexDirection,
   )
 
-  // Identify the current value, whatever that may be.
-  const currentValue: GetModifiableAttributeResult = withUnderlyingTargetFromEditorState(
-    command.target,
-    editorState,
-    left(`no target element was found at path ${EP.toString(command.target)}`),
-    (_, element) => {
-      if (isJSXElement(element)) {
-        return getModifiableJSXAttributeAtPath(element.props, command.property)
-      } else {
-        return left(`No JSXElement was found at path ${EP.toString(command.target)}`)
-      }
-    },
-  )
-  if (isLeft(currentValue)) {
+  const styleInfo = getActivePlugin(editorStateWithPropsDeleted).styleInfoFactory({
+    projectContents: editorStateWithPropsDeleted.projectContents,
+  })(command.target)
+
+  if (styleInfo == null) {
     return {
       editorStatePatches: [],
-      commandDescription: `Set Css Length Prop: ${EP.toUid(command.target)}/${PP.toString(
-        command.property,
-      )} not applied as value is not writeable.`,
+      commandDescription: `Set Css Length Prop: Element not found at ${EP.toUid(command.target)}`,
     }
   }
-  const currentModifiableValue = currentValue.value
-  const simpleValueResult = jsxSimpleAttributeToValue(currentModifiableValue)
 
-  const targetPropertyNonExistant: boolean = currentModifiableValue.type === 'ATTRIBUTE_NOT_FOUND'
+  const property = command.property.propertyElements[1] // the safety of propertyElements[1] is guaranteed by the LengthPropertyPath type
+
+  const currentValue = getCSSNumberFromStyleInfo(styleInfo, property)
   if (
-    targetPropertyNonExistant &&
+    currentValue.type === 'not-found' &&
     command.createIfNonExistant === 'do-not-create-if-doesnt-exist'
   ) {
     return {
@@ -127,18 +111,18 @@ export const runSetCssLengthProperty = (
     }
   }
 
-  let propsToUpdate: Array<ValueAtPath> = []
+  let propsToUpdate: Array<StyleUpdate> = []
 
   let percentageValueWasReplaced: boolean = false
-  const javascriptExpressionValueWasReplaced: boolean = isLeft(simpleValueResult) // Left for jsxSimpleAttributeToValue means "not simple" which means a javascript expression like `5 + props.hello`
+  const javascriptExpressionValueWasReplaced = currentValue.type === 'not-css-number'
 
-  const parsePercentResult = parseCSSPercent(simpleValueResult.value)
   if (
-    isRight(parsePercentResult) &&
+    currentValue.type === 'css-number' &&
+    currentValue.number.unit === '%' &&
     command.value.type === 'KEEP_ORIGINAL_UNIT' &&
     command.value.parentDimensionPx != null
   ) {
-    const currentValuePercent = parsePercentResult.value
+    const currentValuePercent = currentValue.number
     const valueInPercent = roundTo(
       (command.value.valuePx / command.value.parentDimensionPx) * 100,
       2,
@@ -150,8 +134,9 @@ export const runSetCssLengthProperty = (
     const newValue = printCSSNumber(newValueCssNumber, null)
 
     propsToUpdate.push({
-      path: command.property,
-      value: jsExpressionValue(newValue, emptyComments),
+      type: 'set',
+      property: property,
+      value: newValue,
     })
   } else {
     const newCssValue =
@@ -161,29 +146,31 @@ export const runSetCssLengthProperty = (
 
     if (
       command.whenReplacingPercentageValues === 'warn-about-replacement' &&
-      isRight(parsePercentResult)
+      currentValue.type === 'css-number' &&
+      currentValue.number.unit === '%'
     ) {
       percentageValueWasReplaced = true
     }
 
     const printedValue = printCSSNumberOrKeyword(newCssValue, 'px')
 
     propsToUpdate.push({
-      path: command.property,
-      value: jsExpressionValue(printedValue, emptyComments),
+      type: 'set',
+      property: property,
+      value: printedValue,
     })
   }
 
   // Apply the update to the properties.
-  const { editorStatePatch: propertyUpdatePatch } = applyValuesAtPath(
+  const { editorStatePatches } = runStyleUpdateForStrategy(
+    interactionLifecycle,
     editorStateWithPropsDeleted,
     command.target,
     propsToUpdate,
   )
 
   // Always include the property update patch, but potentially also include a warning
   // that a percentage based property was replaced with a pixel based one.
-  let editorStatePatches: Array<EditorStatePatch> = [propertyUpdatePatch]
   if (percentageValueWasReplaced) {
     editorStatePatches.push(
       addToastPatch(

editor/src/components/canvas/commands/utils/property-utils.ts

@@ -110,12 +110,8 @@ export type GetCSSNumberFromStyleInfoResult =
 
 export function getCSSNumberFromStyleInfo(
   styleInfo: StyleInfo,
-  property: string,
+  property: keyof StyleInfo,
 ): GetCSSNumberFromStyleInfoResult {
-  if (!isStyleInfoKey(property)) {
-    return { type: 'not-found' }
-  }
-
   const prop = styleInfo[property]
   if (prop == null || prop.type === 'not-found') {
     return { type: 'not-found' }

editor/src/components/canvas/plugins/inline-style-plugin.ts

@@ -73,6 +73,7 @@ export const InlineStylePlugin: StylePlugin = {
       const paddingBottom = getPropertyFromInstance('paddingBottom', element.props)
       const paddingLeft = getPropertyFromInstance('paddingLeft', element.props)
       const paddingRight = getPropertyFromInstance('paddingRight', element.props)
+      const zIndex = getPropertyFromInstance('zIndex', element.props)
 
       return {
         gap: gap,
@@ -89,6 +90,7 @@ export const InlineStylePlugin: StylePlugin = {
         paddingBottom: paddingBottom,
         paddingLeft: paddingLeft,
         paddingRight: paddingRight,
+        zIndex: zIndex,
       }
     },
   updateStyles: (editorState, elementPath, updates) => {

editor/src/components/canvas/plugins/tailwind-style-plugin.ts

@@ -37,6 +37,7 @@ const TailwindPropertyMapping: Record<string, string> = {
   paddingRight: 'paddingRight',
   paddingBottom: 'paddingBottom',
   paddingLeft: 'paddingLeft',
+  zIndex: 'zIndex',
 }
 
 function isSupportedTailwindProperty(prop: unknown): prop is keyof typeof TailwindPropertyMapping {
@@ -119,6 +120,7 @@ export const TailwindPlugin = (config: Config | null): StylePlugin => ({
           mapping[TailwindPropertyMapping.paddingLeft],
           cssParsers.paddingLeft,
         ),
+        zIndex: parseTailwindProperty(mapping[TailwindPropertyMapping.zIndex], cssParsers.zIndex),
       }
     },
   updateStyles: (editorState, elementPath, updates) => {