vis.js is a dynamic, browser-based visualization library
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var util = require('../../util');
var Component = require('./Component');
var moment = require('../../module/moment');
var locales = require('../locales');
/**
* A current time bar
* @param {{range: Range, dom: Object, domProps: Object}} body
* @param {Object} [options] Available parameters:
* {Boolean} [showCurrentTime]
* @constructor CurrentTime
* @extends Component
*/
function CurrentTime (body, options) {
this.body = body;
// default options
this.defaultOptions = {
showCurrentTime: true,
locales: locales,
locale: 'en'
};
this.options = util.extend({}, this.defaultOptions);
this.offset = 0;
this._create();
this.setOptions(options);
}
CurrentTime.prototype = new Component();
/**
* Create the HTML DOM for the current time bar
* @private
*/
CurrentTime.prototype._create = function() {
var bar = document.createElement('div');
bar.className = 'currenttime';
bar.style.position = 'absolute';
bar.style.top = '0px';
bar.style.height = '100%';
this.bar = bar;
};
/**
* Destroy the CurrentTime bar
*/
CurrentTime.prototype.destroy = function () {
this.options.showCurrentTime = false;
this.redraw(); // will remove the bar from the DOM and stop refreshing
this.body = null;
};
/**
* Set options for the component. Options will be merged in current options.
* @param {Object} options Available parameters:
* {boolean} [showCurrentTime]
*/
CurrentTime.prototype.setOptions = function(options) {
if (options) {
// copy all options that we know
util.selectiveExtend(['showCurrentTime', 'locale', 'locales'], this.options, options);
}
};
/**
* Repaint the component
* @return {boolean} Returns true if the component is resized
*/
CurrentTime.prototype.redraw = function() {
if (this.options.showCurrentTime) {
var parent = this.body.dom.backgroundVertical;
if (this.bar.parentNode != parent) {
// attach to the dom
if (this.bar.parentNode) {
this.bar.parentNode.removeChild(this.bar);
}
parent.appendChild(this.bar);
this.start();
}
var now = new Date(new Date().valueOf() + this.offset);
var x = this.body.util.toScreen(now);
var locale = this.options.locales[this.options.locale];
var title = locale.current + ' ' + locale.time + ': ' + moment(now).format('dddd, MMMM Do YYYY, H:mm:ss');
title = title.charAt(0).toUpperCase() + title.substring(1);
this.bar.style.left = x + 'px';
this.bar.title = title;
}
else {
// remove the line from the DOM
if (this.bar.parentNode) {
this.bar.parentNode.removeChild(this.bar);
}
this.stop();
}
return false;
};
/**
* Start auto refreshing the current time bar
*/
CurrentTime.prototype.start = function() {
var me = this;
function update () {
me.stop();
// determine interval to refresh
var scale = me.body.range.conversion(me.body.domProps.center.width).scale;
var interval = 1 / scale / 10;
if (interval < 30) interval = 30;
if (interval > 1000) interval = 1000;
me.redraw();
// start a timer to adjust for the new time
me.currentTimeTimer = setTimeout(update, interval);
}
update();
};
/**
* Stop auto refreshing the current time bar
*/
CurrentTime.prototype.stop = function() {
if (this.currentTimeTimer !== undefined) {
clearTimeout(this.currentTimeTimer);
delete this.currentTimeTimer;
}
};
/**
* Set a current time. This can be used for example to ensure that a client's
* time is synchronized with a shared server time.
* @param {Date | String | Number} time A Date, unix timestamp, or
* ISO date string.
*/
CurrentTime.prototype.setCurrentTime = function(time) {
var t = util.convert(time, 'Date').valueOf();
var now = new Date().valueOf();
this.offset = t - now;
this.redraw();
};
/**
* Get the current time.
* @return {Date} Returns the current time.
*/
CurrentTime.prototype.getCurrentTime = function() {
return new Date(new Date().valueOf() + this.offset);
};
module.exports = CurrentTime;