General.Web/wwwroot/lib/codemirror-5.31.0/src/input/TextareaInput.js

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import { operation, runInOp } from "../display/operations"
import { prepareSelection } from "../display/selection"
import { applyTextInput, copyableRanges, handlePaste, hiddenTextarea, setLastCopied } from "./input"
import { cursorCoords, posFromMouse } from "../measurement/position_measurement"
import { eventInWidget } from "../measurement/widgets"
import { simpleSelection } from "../model/selection"
import { selectAll, setSelection } from "../model/selection_updates"
import { captureRightClick, ie, ie_version, ios, mac, mobile, presto, webkit } from "../util/browser"
import { activeElt, removeChildrenAndAdd, selectInput } from "../util/dom"
import { e_preventDefault, e_stop, off, on, signalDOMEvent } from "../util/event"
import { hasSelection } from "../util/feature_detection"
import { Delayed, sel_dontScroll } from "../util/misc"

// TEXTAREA INPUT STYLE

export default class TextareaInput {
  constructor(cm) {
    this.cm = cm
    // See input.poll and input.reset
    this.prevInput = ""

    // Flag that indicates whether we expect input to appear real soon
    // now (after some event like 'keypress' or 'input') and are
    // polling intensively.
    this.pollingFast = false
    // Self-resetting timeout for the poller
    this.polling = new Delayed()
    // Used to work around IE issue with selection being forgotten when focus moves away from textarea
    this.hasSelection = false
    this.composing = null
  }

  init(display) {
    let input = this, cm = this.cm

    // Wraps and hides input textarea
    let div = this.wrapper = hiddenTextarea()
    // The semihidden textarea that is focused when the editor is
    // focused, and receives input.
    let te = this.textarea = div.firstChild
    display.wrapper.insertBefore(div, display.wrapper.firstChild)

    // Needed to hide big blue blinking cursor on Mobile Safari (doesn't seem to work in iOS 8 anymore)
    if (ios) te.style.width = "0px"

    on(te, "input", () => {
      if (ie && ie_version >= 9 && this.hasSelection) this.hasSelection = null
      input.poll()
    })

    on(te, "paste", e => {
      if (signalDOMEvent(cm, e) || handlePaste(e, cm)) return

      cm.state.pasteIncoming = true
      input.fastPoll()
    })

    function prepareCopyCut(e) {
      if (signalDOMEvent(cm, e)) return
      if (cm.somethingSelected()) {