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* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var EventEmitter = require( 'events' ).EventEmitter;
var logger = require( 'debug' );
var setReadOnly = require( '@stdlib/utils/define-nonenumerable-read-only-property' );
var inherit = require( '@stdlib/utils/inherit' );
var instanceOf = require( '@stdlib/assert/instance-of' );
var render = require( './render.js' );
// VARIABLES //
var debug = logger( 'defs:main' );
// MAIN //
/**
* SVG definitions constructor.
*
* @constructor
* @returns {Defs} definitions instance
*
* @example
* var node = new Defs();
* // returns <Defs>
*/
function Defs() {
var self;
if ( !instanceOf( this, Defs ) ) {
return new Defs();
}
self = this;
debug( 'Creating an instance...' );
EventEmitter.call( this );
this.on( 'change', onChange );
this.on( '_render', onRender );
return this;
/**
* Callback invoked upon receiving a change event.
*
* @private
*/
function onChange() {
debug( 'Received a change event.' );
self.render();
}
/**
* Re-emits a render event.
*
* @private
*/
function onRender() {
var args;
var i;
debug( 'Received a render event. Re-emitting...' );
args = [ 'render' ];
for ( i = 0 ; i < arguments.length; i++ ) {
args.push( arguments[ i ] );
}
self.emit.apply( self, args );
}
}
/*
* Inherit from the `EventEmitter` prototype.
*/
inherit( Defs, EventEmitter );
/**
* Renders a virtual DOM tree.
*
* @name render
* @memberof Defs.prototype
* @type {Function}
* @returns {VTree} virtual tree
*
* @example
* var node = new Defs();
*
* var out = node.render();
* // returns <Object>
*/
setReadOnly( Defs.prototype, 'render', render );
// EXPORTS //
module.exports = Defs;
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