Function isSelectLineEdge

packages/editor/src/plugin/editable.ts:231–257

* 检查选区是否选中在内容一行的开始或者结尾 * @param editor * @param options * @returns

(editor: Editor, options: { point?: Point; edge?: SelectionEdge } = {})

   * @returns
   */
  isSelectLineEdge(editor: Editor, options: { point?: Point; edge?: SelectionEdge } = {}): boolean {
    const { point = editor.selection?.focus, edge = 'start' } = options
    if (!point) return false
    const entry = Editor.above(editor, { at: point, match: n => Editor.isBlock(editor, n) })
    if (!entry) return false
    const [block] = entry
    const rangeLines = getLineRectsByRange(editor, { anchor: point, focus: point })
    if (rangeLines.length === 0) return false
    const rangeLine = rangeLines[0]
    const lines = getLineRectsByNode(editor, block)
    for (const line of lines) {
      if (
        ~['start', 'anchor'].indexOf(edge) &&
        line.left === rangeLine.left &&
        line.top === rangeLine.top
      ) {
        return true
      } else if (
        ~['end', 'focus'].indexOf(edge) &&
        line.right === rangeLine.right &&
        line.top === rangeLine.top
      ) {
        return true
      }
    }
    return false
  },

  /**
   * Return the host window of the current editor.