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Viewing file:     line_numbers.js (2.12 KB)      -rw-r--r--

import { lineNumberFor } from "../line/utils_line.js"
import { compensateForHScroll } from "../measurement/position_measurement.js"
import { elt } from "../util/dom.js"

import { updateGutterSpace } from "./update_display.js"

// Re-align line numbers and gutter marks to compensate for
// horizontal scrolling.
export function alignHorizontally(cm) {
  let display = cm.display, view = display.view
  if (!display.alignWidgets && (!display.gutters.firstChild || !cm.options.fixedGutter)) return
  let comp = compensateForHScroll(display) - display.scroller.scrollLeft + cm.doc.scrollLeft
  let gutterW = display.gutters.offsetWidth, left = comp + "px"
  for (let i = 0; i < view.length; i++) if (!view[i].hidden) {
    if (cm.options.fixedGutter) {
      if (view[i].gutter)
        view[i].gutter.style.left = left
      if (view[i].gutterBackground)
        view[i].gutterBackground.style.left = left
    }
    let align = view[i].alignable
    if (align) for (let j = 0; j < align.length; j++)
      align[j].style.left = left
  }
  if (cm.options.fixedGutter)
    display.gutters.style.left = (comp + gutterW) + "px"
}

// Used to ensure that the line number gutter is still the right
// size for the current document size. Returns true when an update
// is needed.
export function maybeUpdateLineNumberWidth(cm) {
  if (!cm.options.lineNumbers) return false
  let doc = cm.doc, last = lineNumberFor(cm.options, doc.first + doc.size - 1), display = cm.display
  if (last.length != display.lineNumChars) {
    let test = display.measure.appendChild(elt("div", [elt("div", last)],
                                               "CodeMirror-linenumber CodeMirror-gutter-elt"))
    let innerW = test.firstChild.offsetWidth, padding = test.offsetWidth - innerW
    display.lineGutter.style.width = ""
    display.lineNumInnerWidth = Math.max(innerW, display.lineGutter.offsetWidth - padding) + 1
    display.lineNumWidth = display.lineNumInnerWidth + padding
    display.lineNumChars = display.lineNumInnerWidth ? last.length : -1
    display.lineGutter.style.width = display.lineNumWidth + "px"
    updateGutterSpace(cm.display)
    return true
  }
  return false
}