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import { restartBlink } from "./selection.js"
import { webkit } from "../util/browser.js"
import { addClass, rmClass } from "../util/dom.js"
import { signal } from "../util/event.js"

export function ensureFocus(cm) {
  if (!cm.hasFocus()) {
    cm.display.input.focus()
    if (!cm.state.focused) onFocus(cm)
  }
}

export function delayBlurEvent(cm) {
  cm.state.delayingBlurEvent = true
  setTimeout(() => { if (cm.state.delayingBlurEvent) {
    cm.state.delayingBlurEvent = false
    if (cm.state.focused) onBlur(cm)
  } }, 100)
}

export function onFocus(cm, e) {
  if (cm.state.delayingBlurEvent && !cm.state.draggingText) cm.state.delayingBlurEvent = false

  if (cm.options.readOnly == "nocursor") return
  if (!cm.state.focused) {
    signal(cm, "focus", cm, e)
    cm.state.focused = true
    addClass(cm.display.wrapper, "CodeMirror-focused")
    // This test prevents this from firing when a context
    // menu is closed (since the input reset would kill the
    // select-all detection hack)
    if (!cm.curOp && cm.display.selForContextMenu != cm.doc.sel) {
      cm.display.input.reset()
      if (webkit) setTimeout(() => cm.display.input.reset(true), 20) // Issue #1730
    }
    cm.display.input.receivedFocus()
  }
  restartBlink(cm)
}
export function onBlur(cm, e) {
  if (cm.state.delayingBlurEvent) return

  if (cm.state.focused) {
    signal(cm, "blur", cm, e)
    cm.state.focused = false
    rmClass(cm.display.wrapper, "CodeMirror-focused")
  }
  clearInterval(cm.display.blinker)
  setTimeout(() => { if (!cm.state.focused) cm.display.shift = false }, 150)
}