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* Paper.js - The Swiss Army Knife of Vector Graphics Scripting.
* http://paperjs.org/
*
* Copyright (c) 2011 - 2020, Jürg Lehni & Jonathan Puckey
* http://juerglehni.com/ & https://puckey.studio/
*
* Distributed under the MIT license. See LICENSE file for details.
*
* All rights reserved.
*/
// TODO: remove eslint-disable comment and deal with errors over time
/* eslint-disable */
import { Base } from '~/straps';
/**
* @name Emitter
* @namespace
* @private
*/
export const Emitter = {
on: function (type, func) {
// If an object literal is passed, attach all callbacks defined in it
if (typeof type !== 'string') {
Base.each(
type,
function (value, key) {
this.on(key, value);
},
this
);
} else {
var types = this._eventTypes,
entry = types && types[type],
handlers = (this._callbacks = this._callbacks || {});
handlers = handlers[type] = handlers[type] || [];
if (handlers.indexOf(func) === -1) {
// Not added yet, add now.
handlers.push(func);
// See if this is the first handler that we're attaching,
// and call install if defined.
if (entry && entry.install && handlers.length === 1) entry.install.call(this, type);
}
}
return this;
},
off: function (type, func) {
// If an object literal is passed, detach all callbacks defined in it
if (typeof type !== 'string') {
Base.each(
type,
function (value, key) {
this.off(key, value);
},
this
);
return;
}
var types = this._eventTypes,
entry = types && types[type],
handlers = this._callbacks && this._callbacks[type],
index;
if (handlers) {
// See if this is the last handler that we're detaching (or if we
// are detaching all handlers), and call uninstall if defined.
if (!func || ((index = handlers.indexOf(func)) !== -1 && handlers.length === 1)) {
if (entry && entry.uninstall) entry.uninstall.call(this, type);
// Delete handlers entry again, so responds() returns false.
delete this._callbacks[type];
} else if (index !== -1) {
// Just remove this one handler
handlers.splice(index, 1);
}
}
return this;
},
once: function (type, func) {
return this.on(type, function handler() {
func.apply(this, arguments);
this.off(type, handler);
});
},
emit: function (type, event) {
// Returns true if any events were emitted, false otherwise.
var handlers = this._callbacks && this._callbacks[type];
if (!handlers) return false;
var args = Base.slice(arguments, 1),
// Set the current target to `this` if the event object defines
// #target but not #currentTarget.
setTarget = event && event.target && !event.currentTarget;
// Create a clone of the handlers list so changes caused by on / off
// won't throw us off track here:
handlers = handlers.slice();
if (setTarget) event.currentTarget = this;
for (var i = 0, l = handlers.length; i < l; i++) {
if (handlers[i].apply(this, args) == false) {
// If the handler returns false, prevent the default behavior
// and stop propagation of the event by calling stop()
if (event && event.stop) event.stop();
// Stop propagation right now!
break;
}
}
if (setTarget) delete event.currentTarget;
return true;
},
responds: function (type) {
return !!(this._callbacks && this._callbacks[type]);
},
// Keep deprecated methods around from previous Callback interface.
attach: '#on',
detach: '#off',
fire: '#emit',
_installEvents: function (install) {
var types = this._eventTypes,
handlers = this._callbacks,
key = install ? 'install' : 'uninstall';
if (types) {
for (var type in handlers) {
if (handlers[type].length > 0) {
var entry = types[type],
func = entry && entry[key];
if (func) func.call(this, type);
}
}
}
},
statics: {
// Override inject() so that sub-classes automatically add the accessors
// for the event handler functions (e.g. #onMouseDown) for each property
// NOTE: This needs to be defined in the first injection scope, as for
// simplicity, we don't loop through all of them here.
inject: function inject(src) {
var events = src._events;
if (events) {
// events can either be an object literal or an array of
// strings describing the on*-names.
// We need to map lowercased event types to the event
// entries represented by these on*-names in _events.
var types = {};
Base.each(events, function (entry, key) {
var isString = typeof entry === 'string',
name = isString ? entry : key,
part = Base.capitalize(name),
type = name.substring(2).toLowerCase();
// Map the event type name to the event entry.
types[type] = isString ? {} : entry;
// Create getters and setters for the property
// with the on*-name name:
name = '_' + name;
src['get' + part] = function () {
return this[name];
};
src['set' + part] = function (func) {
// Detach the previous event, if there was one.
var prev = this[name];
if (prev) this.off(type, prev);
if (func) this.on(type, func);
this[name] = func;
};
});
src._eventTypes = types;
}
return (inject as any).base.apply(this, arguments);
},
},
};
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