fix: strikeout style rendering position #498

src/editor/core/draw/Draw.ts

@@ -80,7 +80,10 @@ import { I18n } from '../i18n/I18n'
 import { ImageObserver } from '../observer/ImageObserver'
 import { Zone } from '../zone/Zone'
 import { Footer } from './frame/Footer'
-import { INLINE_ELEMENT_TYPE } from '../../dataset/constant/Element'
+import {
+  INLINE_ELEMENT_TYPE,
+  TEXTLIKE_ELEMENT_TYPE
+} from '../../dataset/constant/Element'
 import { ListParticle } from './particle/ListParticle'
 import { Placeholder } from './frame/Placeholder'
 import { EventBus } from '../event/eventbus/EventBus'
@@ -1079,7 +1082,7 @@ export class Draw {
     ctx.direction = 'ltr'
   }
 
-  private _getFont(el: IElement, scale = 1): string {
+  public getElementFont(el: IElement, scale = 1): string {
     const { defaultSize, defaultFont } = this.options
     const font = el.font || defaultFont
     const size = el.actualSize || el.size || defaultSize
@@ -1088,6 +1091,10 @@ export class Draw {
     }px ${font}`
   }
 
+  public getElementSize(el: IElement) {
+    return el.actualSize || el.size || this.options.defaultSize
+  }
+
   public computeRowList(innerWidth: number, elementList: IElement[]) {
     const { defaultSize, defaultRowMargin, scale, tdPadding, defaultTabWidth } =
       this.options
@@ -1414,7 +1421,7 @@ export class Draw {
           element.actualSize = Math.ceil(size * 0.6)
         }
         metrics.height = (element.actualSize || size) * scale
-        ctx.font = this._getFont(element)
+        ctx.font = this.getElementFont(element)
         const fontMetrics = this.textParticle.measureText(ctx, element)
         metrics.width = fontMetrics.width * scale
         if (element.letterSpacing) {
@@ -1445,7 +1452,7 @@ export class Draw {
         rowMargin
       const rowElement: IRowElement = Object.assign(element, {
         metrics,
-        style: this._getFont(element, scale)
+        style: this.getElementFont(element, scale)
       })
       // 暂时只考虑非换行场景：控件开始时统计宽度，结束时消费宽度及还原
       if (rowElement.control?.minWidth) {
@@ -1831,12 +1838,34 @@ export class Draw {
         }
         // 删除线记录
         if (element.strikeout) {
-          this.strikeout.recordFillInfo(
-            ctx,
-            x,
-            y + curRow.height / 2,
-            metrics.width
-          )
+          // 仅文本类元素支持删除线
+          if (!element.type || TEXTLIKE_ELEMENT_TYPE.includes(element.type)) {
+            // 字体大小不同时需立即绘制
+            if (
+              preElement &&
+              this.getElementSize(preElement) !== this.getElementSize(element)
+            ) {
+              this.strikeout.render(ctx)
+            }
+            // 基线文字测量信息
+            const standardMetrics = this.textParticle.measureBasisWord(
+              ctx,
+              this.getElementFont(element)
+            )
+            // 文字渲染位置 + 基线文字下偏移量 - 一半文字高度
+            let adjustY =
+              y +
+              offsetY +
+              standardMetrics.actualBoundingBoxDescent * scale -
+              metrics.height / 2
+            // 上下标位置调整
+            if (element.type === ElementType.SUBSCRIPT) {
+              adjustY += this.subscriptParticle.getOffsetY(element)
+            } else if (element.type === ElementType.SUPERSCRIPT) {
+              adjustY += this.superscriptParticle.getOffsetY(element)
+            }
+            this.strikeout.recordFillInfo(ctx, x, adjustY, metrics.width)
+          }
         } else if (preElement?.strikeout) {
           this.strikeout.render(ctx)
         }

src/editor/core/draw/particle/TextParticle.ts

@@ -1,5 +1,8 @@
 import { ElementType, IEditorOption, IElement } from '../../..'
-import { PUNCTUATION_LIST } from '../../../dataset/constant/Common'
+import {
+  PUNCTUATION_LIST,
+  METRICS_BASIS_TEXT
+} from '../../../dataset/constant/Common'
 import { DeepRequired } from '../../../interface/Common'
 import { IRowElement } from '../../../interface/Row'
 import { ITextMetrics } from '../../../interface/Text'
@@ -33,6 +36,19 @@ export class TextParticle {
     this.cacheMeasureText = new Map()
   }
 
+  public measureBasisWord(
+    ctx: CanvasRenderingContext2D,
+    font: string
+  ): ITextMetrics {
+    ctx.save()
+    ctx.font = font
+    const textMetrics = this.measureText(ctx, {
+      value: METRICS_BASIS_TEXT
+    })
+    ctx.restore()
+    return textMetrics
+  }
+
   public measureWord(
     ctx: CanvasRenderingContext2D,
     elementList: IElement[],

src/editor/core/draw/richtext/Strikeout.ts

@@ -12,9 +12,10 @@ export class Strikeout extends AbstractRichText {
 
   public render(ctx: CanvasRenderingContext2D) {
     if (!this.fillRect.width) return
-    const { strikeoutColor } = this.options
+    const { scale, strikeoutColor } = this.options
     const { x, y, width } = this.fillRect
     ctx.save()
+    ctx.lineWidth = scale
     ctx.strokeStyle = strikeoutColor
     const adjustY = y + 0.5 // 从1处渲染，避免线宽度等于3
     ctx.beginPath()

src/editor/dataset/constant/Common.ts

@@ -40,3 +40,5 @@ export const LETTER_CLASS = {
   SWEDISH: 'A-Za-zÅåÄäÖö',
   GREEK: 'ΑαΒβΓγΔδΕεΖζΗηΘθΙιΚκΛλΜμΝνΞξΟοΠπΡρΣσςΤτΥυΦφΧχΨψΩω'
 }
+
+export const METRICS_BASIS_TEXT = '日'

src/editor/utils/element.ts

@@ -754,6 +754,9 @@ export function convertElementToDom(
   if (element.underline) {
     dom.style.textDecoration = 'underline'
   }
+  if (element.strikeout) {
+    dom.style.textDecoration += ' line-through'
+  }
   dom.innerText = element.value.replace(new RegExp(`${ZERO}`, 'g'), '\n')
   return dom
 }
@@ -981,9 +984,13 @@ export function convertTextNodeToElement(
     element.highlight = style.backgroundColor
   }
   // 下划线
-  if (style.textDecorationLine === 'underline') {
+  if (style.textDecorationLine.includes('underline')) {
     element.underline = true
   }
+  // 删除线
+  if (style.textDecorationLine.includes('line-through')) {
+    element.strikeout = true
+  }
   return element
 }