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1 import { mac } from "./browser.js"
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2 import { indexOf } from "./misc.js"
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3
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4 // EVENT HANDLING
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5
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6 // Lightweight event framework. on/off also work on DOM nodes,
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7 // registering native DOM handlers.
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8
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9 const noHandlers = []
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10
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11 export let on = function(emitter, type, f) {
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12 if (emitter.addEventListener) {
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13 emitter.addEventListener(type, f, false)
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14 } else if (emitter.attachEvent) {
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15 emitter.attachEvent("on" + type, f)
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16 } else {
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17 let map = emitter._handlers || (emitter._handlers = {})
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18 map[type] = (map[type] || noHandlers).concat(f)
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19 }
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20 }
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21
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22 export function getHandlers(emitter, type) {
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23 return emitter._handlers && emitter._handlers[type] || noHandlers
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24 }
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25
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26 export function off(emitter, type, f) {
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27 if (emitter.removeEventListener) {
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28 emitter.removeEventListener(type, f, false)
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29 } else if (emitter.detachEvent) {
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30 emitter.detachEvent("on" + type, f)
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31 } else {
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32 let map = emitter._handlers, arr = map && map[type]
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33 if (arr) {
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34 let index = indexOf(arr, f)
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35 if (index > -1)
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36 map[type] = arr.slice(0, index).concat(arr.slice(index + 1))
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37 }
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38 }
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39 }
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40
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41 export function signal(emitter, type /*, values...*/) {
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42 let handlers = getHandlers(emitter, type)
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43 if (!handlers.length) return
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44 let args = Array.prototype.slice.call(arguments, 2)
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45 for (let i = 0; i < handlers.length; ++i) handlers[i].apply(null, args)
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46 }
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47
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48 // The DOM events that CodeMirror handles can be overridden by
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49 // registering a (non-DOM) handler on the editor for the event name,
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50 // and preventDefault-ing the event in that handler.
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51 export function signalDOMEvent(cm, e, override) {
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52 if (typeof e == "string")
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53 e = {type: e, preventDefault: function() { this.defaultPrevented = true }}
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54 signal(cm, override || e.type, cm, e)
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55 return e_defaultPrevented(e) || e.codemirrorIgnore
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56 }
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57
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58 export function signalCursorActivity(cm) {
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59 let arr = cm._handlers && cm._handlers.cursorActivity
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60 if (!arr) return
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61 let set = cm.curOp.cursorActivityHandlers || (cm.curOp.cursorActivityHandlers = [])
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62 for (let i = 0; i < arr.length; ++i) if (indexOf(set, arr[i]) == -1)
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63 set.push(arr[i])
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64 }
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65
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66 export function hasHandler(emitter, type) {
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67 return getHandlers(emitter, type).length > 0
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68 }
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69
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70 // Add on and off methods to a constructor's prototype, to make
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71 // registering events on such objects more convenient.
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72 export function eventMixin(ctor) {
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73 ctor.prototype.on = function(type, f) {on(this, type, f)}
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74 ctor.prototype.off = function(type, f) {off(this, type, f)}
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75 }
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76
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77 // Due to the fact that we still support jurassic IE versions, some
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78 // compatibility wrappers are needed.
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79
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80 export function e_preventDefault(e) {
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81 if (e.preventDefault) e.preventDefault()
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82 else e.returnValue = false
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83 }
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84 export function e_stopPropagation(e) {
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85 if (e.stopPropagation) e.stopPropagation()
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86 else e.cancelBubble = true
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87 }
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88 export function e_defaultPrevented(e) {
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89 return e.defaultPrevented != null ? e.defaultPrevented : e.returnValue == false
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90 }
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91 export function e_stop(e) {e_preventDefault(e); e_stopPropagation(e)}
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92
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93 export function e_target(e) {return e.target || e.srcElement}
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94 export function e_button(e) {
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95 let b = e.which
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96 if (b == null) {
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97 if (e.button & 1) b = 1
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98 else if (e.button & 2) b = 3
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99 else if (e.button & 4) b = 2
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100 }
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101 if (mac && e.ctrlKey && b == 1) b = 3
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102 return b
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103 }
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