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132 lines
3.0 KiB
132 lines
3.0 KiB
var util = require('../../util');
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var Component = require('./Component');
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/**
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* A current time bar
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* @param {{range: Range, dom: Object, domProps: Object}} body
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* @param {Object} [options] Available parameters:
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* {Boolean} [showCurrentTime]
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* @constructor CurrentTime
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* @extends Component
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*/
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function CurrentTime (body, options) {
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this.body = body;
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// default options
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this.defaultOptions = {
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showCurrentTime: true
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};
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this.options = util.extend({}, this.defaultOptions);
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this._create();
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this.setOptions(options);
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}
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CurrentTime.prototype = new Component();
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/**
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* Create the HTML DOM for the current time bar
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* @private
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*/
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CurrentTime.prototype._create = function() {
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var bar = document.createElement('div');
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bar.className = 'currenttime';
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bar.style.position = 'absolute';
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bar.style.top = '0px';
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bar.style.height = '100%';
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this.bar = bar;
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};
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/**
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* Destroy the CurrentTime bar
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*/
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CurrentTime.prototype.destroy = function () {
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this.options.showCurrentTime = false;
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this.redraw(); // will remove the bar from the DOM and stop refreshing
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this.body = null;
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};
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/**
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* Set options for the component. Options will be merged in current options.
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* @param {Object} options Available parameters:
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* {boolean} [showCurrentTime]
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*/
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CurrentTime.prototype.setOptions = function(options) {
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if (options) {
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// copy all options that we know
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util.selectiveExtend(['showCurrentTime'], this.options, options);
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}
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};
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/**
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* Repaint the component
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* @return {boolean} Returns true if the component is resized
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*/
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CurrentTime.prototype.redraw = function() {
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if (this.options.showCurrentTime) {
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var parent = this.body.dom.backgroundVertical;
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if (this.bar.parentNode != parent) {
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// attach to the dom
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if (this.bar.parentNode) {
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this.bar.parentNode.removeChild(this.bar);
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}
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parent.appendChild(this.bar);
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this.start();
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}
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var now = new Date();
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var x = this.body.util.toScreen(now);
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this.bar.style.left = x + 'px';
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this.bar.title = 'Current time: ' + now;
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}
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else {
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// remove the line from the DOM
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if (this.bar.parentNode) {
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this.bar.parentNode.removeChild(this.bar);
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}
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this.stop();
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}
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return false;
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};
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/**
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* Start auto refreshing the current time bar
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*/
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CurrentTime.prototype.start = function() {
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var me = this;
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function update () {
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me.stop();
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// determine interval to refresh
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var scale = me.body.range.conversion(me.body.domProps.center.width).scale;
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var interval = 1 / scale / 10;
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if (interval < 30) interval = 30;
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if (interval > 1000) interval = 1000;
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me.redraw();
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// start a timer to adjust for the new time
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me.currentTimeTimer = setTimeout(update, interval);
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}
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update();
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};
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/**
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* Stop auto refreshing the current time bar
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*/
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CurrentTime.prototype.stop = function() {
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if (this.currentTimeTimer !== undefined) {
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clearTimeout(this.currentTimeTimer);
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delete this.currentTimeTimer;
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}
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};
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module.exports = CurrentTime;
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