Function findNextLinePoint

packages/editor/src/plugin/editable.ts:768–821

(editor: Editor, at?: Range)

  },

  findNextLinePoint(editor: Editor, at?: Range): Point | null {
    const { selection } = editor
    if (!at && selection) at = selection
    if (!at) return null
    const startPoint = Range.start(at)
    const endPoint = Range.end(at)
    const startRange = Editable.toDOMRange(editor, { anchor: startPoint, focus: startPoint })
    const endRange = Editable.toDOMRange(editor, { anchor: endPoint, focus: endPoint })

    const startRects = startRange.getClientRects()
    const endRects = endRange.getClientRects()

    let blockEntry = Editor.above(editor, {
      at: at.focus,
      match: n => Editor.isBlock(editor, n),
    })
    let bottom = endRects[0].bottom
    let isFind = false
    let isSameLine = true
    let domBlock: DOMElement | null = null
    while (blockEntry && !isFind) {
      const [block, path] = blockEntry
      domBlock = Editable.toDOMNode(editor, block)
      const lowestElements = Editable.findLowestDOMElements(editor, block)
      for (let l = 0; l < lowestElements.length && !isFind; l++) {
        const lowestElement = lowestElements[l]
        const rects = lowestElement.getClientRects()
        for (let i = 0; i < rects.length; i++) {
          const rect = rects[i]
          if (rect.height === 0) continue
          if (rect.top >= bottom) {
            isFind = true
            bottom = rect.top + rect.height / 2
            break
          }
        }
      }
      if (!isFind) {
        blockEntry = Editor.next(editor, {
          at: path,
          match: n => Editor.isBlock(editor, n),
        })
        isSameLine = false
      }
    }
    if (!domBlock) return null

    return Editable.findClosestPoint(
      editor,
      domBlock,
      isFind && !isSameLine ? startRects[0].x : 99999,
      bottom,
    )
  },

  findTextOffsetOnLine(editor: Editor, point: Point) {
    const blockEntry = Editor.above(editor, {