Function getSelectLine

packages/editor/src/plugin/editable.ts:191–224

* 获取在选区内选中一行内容的节点以及所在行的索引 * @param editor * @param options * @returns

(
    editor: Editor,
    options: { range?: Range; match?: (element: Element) => boolean } = {},
  )

   * @returns
   */
  getSelectLine(
    editor: Editor,
    options: { range?: Range; match?: (element: Element) => boolean } = {},
  ): [Element, number] | undefined {
    const { range = editor.selection, match = () => true } = options
    if (!range || Range.isCollapsed(range)) return
    const start = Range.start(range)
    const entry = Editor.above(editor, { at: start, match: n => Editor.isBlock(editor, n) })
    if (!entry) return
    const rangeLines = getLineRectsByRange(editor, range)
    let [block, path] = entry
    while (block) {
      if (match(block)) {
        const elLines = getLineRectsByNode(editor, block)
        for (const rangeLine of rangeLines) {
          const index = elLines.findIndex(
            elLine =>
              elLine.left === rangeLine.left &&
              elLine.top === rangeLine.top &&
              elLine.width === rangeLine.width,
          )
          if (~index) {
            return [block, index]
          }
        }
      }
      const next = Editor.next(editor, { at: path, match: n => Editor.isBlock(editor, n) })
      if (!next) return
      const [n, p] = next
      block = n as Element
      path = p
    }
    return
  },
  /**
   * 检查选区是否选中在内容一行的开始或者结尾
   * @param editor