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Viewing file:     event.js (3.19 KB)      -rw-r--r--

import { mac } from "./browser.js"
import { indexOf } from "./misc.js"

// EVENT HANDLING

// Lightweight event framework. on/off also work on DOM nodes,
// registering native DOM handlers.

const noHandlers = []

export let on = function(emitter, type, f) {
  if (emitter.addEventListener) {
    emitter.addEventListener(type, f, false)
  } else if (emitter.attachEvent) {
    emitter.attachEvent("on" + type, f)
  } else {
    let map = emitter._handlers || (emitter._handlers = {})
    map[type] = (map[type] || noHandlers).concat(f)
  }
}

export function getHandlers(emitter, type) {
  return emitter._handlers && emitter._handlers[type] || noHandlers
}

export function off(emitter, type, f) {
  if (emitter.removeEventListener) {
    emitter.removeEventListener(type, f, false)
  } else if (emitter.detachEvent) {
    emitter.detachEvent("on" + type, f)
  } else {
    let map = emitter._handlers, arr = map && map[type]
    if (arr) {
      let index = indexOf(arr, f)
      if (index > -1)
        map[type] = arr.slice(0, index).concat(arr.slice(index + 1))
    }
  }
}

export function signal(emitter, type /*, values...*/) {
  let handlers = getHandlers(emitter, type)
  if (!handlers.length) return
  let args = Array.prototype.slice.call(arguments, 2)
  for (let i = 0; i < handlers.length; ++i) handlers[i].apply(null, args)
}

// The DOM events that CodeMirror handles can be overridden by
// registering a (non-DOM) handler on the editor for the event name,
// and preventDefault-ing the event in that handler.
export function signalDOMEvent(cm, e, override) {
  if (typeof e == "string")
    e = {type: e, preventDefault: function() { this.defaultPrevented = true }}
  signal(cm, override || e.type, cm, e)
  return e_defaultPrevented(e) || e.codemirrorIgnore
}

export function signalCursorActivity(cm) {
  let arr = cm._handlers && cm._handlers.cursorActivity
  if (!arr) return
  let set = cm.curOp.cursorActivityHandlers || (cm.curOp.cursorActivityHandlers = [])
  for (let i = 0; i < arr.length; ++i) if (indexOf(set, arr[i]) == -1)
    set.push(arr[i])
}

export function hasHandler(emitter, type) {
  return getHandlers(emitter, type).length > 0
}

// Add on and off methods to a constructor's prototype, to make
// registering events on such objects more convenient.
export function eventMixin(ctor) {
  ctor.prototype.on = function(type, f) {on(this, type, f)}
  ctor.prototype.off = function(type, f) {off(this, type, f)}
}

// Due to the fact that we still support jurassic IE versions, some
// compatibility wrappers are needed.

export function e_preventDefault(e) {
  if (e.preventDefault) e.preventDefault()
  else e.returnValue = false
}
export function e_stopPropagation(e) {
  if (e.stopPropagation) e.stopPropagation()
  else e.cancelBubble = true
}
export function e_defaultPrevented(e) {
  return e.defaultPrevented != null ? e.defaultPrevented : e.returnValue == false
}
export function e_stop(e) {e_preventDefault(e); e_stopPropagation(e)}

export function e_target(e) {return e.target || e.srcElement}
export function e_button(e) {
  let b = e.which
  if (b == null) {
    if (e.button & 1) b = 1
    else if (e.button & 2) b = 3
    else if (e.button & 4) b = 2
  }
  if (mac && e.ctrlKey && b == 1) b = 3
  return b
}