Mercurial
diff .cms/lib/codemirror/src/util/event.js @ 0:78edf6b517a0 draft
24.10
author | Coffee CMS <info@coffee-cms.ru> |
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date | Fri, 11 Oct 2024 22:40:23 +0000 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/.cms/lib/codemirror/src/util/event.js Fri Oct 11 22:40:23 2024 +0000 @@ -0,0 +1,103 @@ +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 +}