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510 lines
16 KiB
510 lines
16 KiB
var util = require('../../util');
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var Component = require('./Component');
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var TimeStep = require('../TimeStep');
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var DateUtil = require('../DateUtil');
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var moment = require('../../module/moment');
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/**
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* A horizontal time axis
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* @param {{dom: Object, domProps: Object, emitter: Emitter, range: Range}} body
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* @param {Object} [options] See TimeAxis.setOptions for the available
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* options.
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* @constructor TimeAxis
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* @extends Component
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*/
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function TimeAxis (body, options) {
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this.dom = {
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foreground: null,
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lines: [],
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majorTexts: [],
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minorTexts: [],
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redundant: {
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lines: [],
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majorTexts: [],
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minorTexts: []
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}
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};
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this.props = {
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range: {
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start: 0,
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end: 0,
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minimumStep: 0
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},
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lineTop: 0
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};
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this.defaultOptions = {
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orientation: {
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axis: 'bottom'
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}, // axis orientation: 'top' or 'bottom'
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showMinorLabels: true,
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showMajorLabels: true,
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maxMinorChars: 7,
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format: TimeStep.FORMAT,
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moment: moment,
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timeAxis: null
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};
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this.options = util.extend({}, this.defaultOptions);
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this.body = body;
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// create the HTML DOM
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this._create();
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this.setOptions(options);
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}
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TimeAxis.prototype = new Component();
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/**
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* Set options for the TimeAxis.
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* Parameters will be merged in current options.
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* @param {Object} options Available options:
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* {string} [orientation.axis]
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* {boolean} [showMinorLabels]
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* {boolean} [showMajorLabels]
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*/
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TimeAxis.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([
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'showMinorLabels',
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'showMajorLabels',
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'maxMinorChars',
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'hiddenDates',
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'timeAxis',
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'moment',
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'rtl'
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], this.options, options);
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// deep copy the format options
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util.selectiveDeepExtend(['format'], this.options, options);
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if ('orientation' in options) {
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if (typeof options.orientation === 'string') {
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this.options.orientation.axis = options.orientation;
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}
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else if (typeof options.orientation === 'object' && 'axis' in options.orientation) {
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this.options.orientation.axis = options.orientation.axis;
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}
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}
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// apply locale to moment.js
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// TODO: not so nice, this is applied globally to moment.js
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if ('locale' in options) {
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if (typeof moment.locale === 'function') {
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// moment.js 2.8.1+
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moment.locale(options.locale);
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}
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else {
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moment.lang(options.locale);
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}
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}
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}
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};
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/**
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* Create the HTML DOM for the TimeAxis
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*/
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TimeAxis.prototype._create = function() {
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this.dom.foreground = document.createElement('div');
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this.dom.background = document.createElement('div');
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this.dom.foreground.className = 'vis-time-axis vis-foreground';
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this.dom.background.className = 'vis-time-axis vis-background';
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};
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/**
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* Destroy the TimeAxis
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*/
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TimeAxis.prototype.destroy = function() {
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// remove from DOM
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if (this.dom.foreground.parentNode) {
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this.dom.foreground.parentNode.removeChild(this.dom.foreground);
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}
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if (this.dom.background.parentNode) {
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this.dom.background.parentNode.removeChild(this.dom.background);
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}
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this.body = null;
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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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TimeAxis.prototype.redraw = function () {
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var props = this.props;
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var foreground = this.dom.foreground;
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var background = this.dom.background;
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// determine the correct parent DOM element (depending on option orientation)
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var parent = (this.options.orientation.axis == 'top') ? this.body.dom.top : this.body.dom.bottom;
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var parentChanged = (foreground.parentNode !== parent);
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// calculate character width and height
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this._calculateCharSize();
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// TODO: recalculate sizes only needed when parent is resized or options is changed
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var showMinorLabels = this.options.showMinorLabels && this.options.orientation.axis !== 'none';
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var showMajorLabels = this.options.showMajorLabels && this.options.orientation.axis !== 'none';
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// determine the width and height of the elemens for the axis
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props.minorLabelHeight = showMinorLabels ? props.minorCharHeight : 0;
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props.majorLabelHeight = showMajorLabels ? props.majorCharHeight : 0;
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props.height = props.minorLabelHeight + props.majorLabelHeight;
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props.width = foreground.offsetWidth;
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props.minorLineHeight = this.body.domProps.root.height - props.majorLabelHeight -
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(this.options.orientation.axis == 'top' ? this.body.domProps.bottom.height : this.body.domProps.top.height);
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props.minorLineWidth = 1; // TODO: really calculate width
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props.majorLineHeight = props.minorLineHeight + props.majorLabelHeight;
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props.majorLineWidth = 1; // TODO: really calculate width
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// take foreground and background offline while updating (is almost twice as fast)
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var foregroundNextSibling = foreground.nextSibling;
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var backgroundNextSibling = background.nextSibling;
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foreground.parentNode && foreground.parentNode.removeChild(foreground);
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background.parentNode && background.parentNode.removeChild(background);
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foreground.style.height = this.props.height + 'px';
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this._repaintLabels();
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// put DOM online again (at the same place)
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if (foregroundNextSibling) {
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parent.insertBefore(foreground, foregroundNextSibling);
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}
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else {
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parent.appendChild(foreground)
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}
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if (backgroundNextSibling) {
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this.body.dom.backgroundVertical.insertBefore(background, backgroundNextSibling);
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}
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else {
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this.body.dom.backgroundVertical.appendChild(background)
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}
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return this._isResized() || parentChanged;
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};
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/**
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* Repaint major and minor text labels and vertical grid lines
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* @private
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*/
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TimeAxis.prototype._repaintLabels = function () {
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var orientation = this.options.orientation.axis;
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// calculate range and step (step such that we have space for 7 characters per label)
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var start = util.convert(this.body.range.start, 'Number');
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var end = util.convert(this.body.range.end, 'Number');
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var timeLabelsize = this.body.util.toTime((this.props.minorCharWidth || 10) * this.options.maxMinorChars).valueOf();
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var minimumStep = timeLabelsize - DateUtil.getHiddenDurationBefore(this.options.moment, this.body.hiddenDates, this.body.range, timeLabelsize);
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minimumStep -= this.body.util.toTime(0).valueOf();
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var step = new TimeStep(new Date(start), new Date(end), minimumStep, this.body.hiddenDates);
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step.setMoment(this.options.moment);
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if (this.options.format) {
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step.setFormat(this.options.format);
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}
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if (this.options.timeAxis) {
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step.setScale(this.options.timeAxis);
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}
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this.step = step;
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// Move all DOM elements to a "redundant" list, where they
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// can be picked for re-use, and clear the lists with lines and texts.
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// At the end of the function _repaintLabels, left over elements will be cleaned up
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var dom = this.dom;
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dom.redundant.lines = dom.lines;
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dom.redundant.majorTexts = dom.majorTexts;
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dom.redundant.minorTexts = dom.minorTexts;
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dom.lines = [];
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dom.majorTexts = [];
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dom.minorTexts = [];
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var current;
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var next;
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var x;
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var xNext;
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var isMajor, nextIsMajor;
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var width = 0, prevWidth;
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var line;
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var labelMinor;
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var xFirstMajorLabel = undefined;
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var count = 0;
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const MAX = 1000;
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var className;
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step.start();
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next = step.getCurrent();
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xNext = this.body.util.toScreen(next);
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while (step.hasNext() && count < MAX) {
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count++;
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isMajor = step.isMajor();
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className = step.getClassName();
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labelMinor = step.getLabelMinor();
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current = next;
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x = xNext;
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step.next();
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next = step.getCurrent();
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nextIsMajor = step.isMajor();
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xNext = this.body.util.toScreen(next);
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prevWidth = width;
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width = xNext - x;
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var showMinorGrid = (width >= prevWidth * 0.4); // prevent displaying of the 31th of the month on a scale of 5 days
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if (this.options.showMinorLabels && showMinorGrid) {
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var label = this._repaintMinorText(x, labelMinor, orientation, className);
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label.style.width = width + 'px'; // set width to prevent overflow
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}
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if (isMajor && this.options.showMajorLabels) {
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if (x > 0) {
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if (xFirstMajorLabel == undefined) {
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xFirstMajorLabel = x;
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}
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label = this._repaintMajorText(x, step.getLabelMajor(), orientation, className);
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}
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line = this._repaintMajorLine(x, width, orientation, className);
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}
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else { // minor line
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if (showMinorGrid) {
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line = this._repaintMinorLine(x, width, orientation, className);
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}
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else {
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if (line) {
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// adjust the width of the previous grid
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line.style.width = (parseInt (line.style.width) + width) + 'px';
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}
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}
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}
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}
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if (count === MAX && !warnedForOverflow) {
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console.warn(`Something is wrong with the Timeline scale. Limited drawing of grid lines to ${MAX} lines.`);
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warnedForOverflow = true;
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}
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// create a major label on the left when needed
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if (this.options.showMajorLabels) {
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var leftTime = this.body.util.toTime(0),
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leftText = step.getLabelMajor(leftTime),
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widthText = leftText.length * (this.props.majorCharWidth || 10) + 10; // upper bound estimation
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if (xFirstMajorLabel == undefined || widthText < xFirstMajorLabel) {
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this._repaintMajorText(0, leftText, orientation, className);
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}
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}
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// Cleanup leftover DOM elements from the redundant list
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util.forEach(this.dom.redundant, function (arr) {
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while (arr.length) {
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var elem = arr.pop();
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if (elem && elem.parentNode) {
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elem.parentNode.removeChild(elem);
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}
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}
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});
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};
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/**
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* Create a minor label for the axis at position x
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* @param {Number} x
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* @param {String} text
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* @param {String} orientation "top" or "bottom" (default)
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* @param {String} className
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* @return {Element} Returns the HTML element of the created label
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* @private
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*/
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TimeAxis.prototype._repaintMinorText = function (x, text, orientation, className) {
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// reuse redundant label
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var label = this.dom.redundant.minorTexts.shift();
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if (!label) {
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// create new label
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var content = document.createTextNode('');
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label = document.createElement('div');
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label.appendChild(content);
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this.dom.foreground.appendChild(label);
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}
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this.dom.minorTexts.push(label);
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label.childNodes[0].nodeValue = text;
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label.style.top = (orientation == 'top') ? (this.props.majorLabelHeight + 'px') : '0';
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if (this.options.rtl) {
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label.style.left = "";
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label.style.right = x + 'px';
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} else {
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label.style.left = x + 'px';
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};
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label.className = 'vis-text vis-minor ' + className;
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//label.title = title; // TODO: this is a heavy operation
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return label;
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};
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/**
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* Create a Major label for the axis at position x
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* @param {Number} x
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* @param {String} text
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* @param {String} orientation "top" or "bottom" (default)
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* @param {String} className
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* @return {Element} Returns the HTML element of the created label
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* @private
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*/
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TimeAxis.prototype._repaintMajorText = function (x, text, orientation, className) {
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// reuse redundant label
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var label = this.dom.redundant.majorTexts.shift();
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if (!label) {
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// create label
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var content = document.createTextNode(text);
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label = document.createElement('div');
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label.appendChild(content);
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this.dom.foreground.appendChild(label);
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}
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this.dom.majorTexts.push(label);
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label.childNodes[0].nodeValue = text;
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label.className = 'vis-text vis-major ' + className;
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//label.title = title; // TODO: this is a heavy operation
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label.style.top = (orientation == 'top') ? '0' : (this.props.minorLabelHeight + 'px');
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if (this.options.rtl) {
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label.style.left = "";
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label.style.right = x + 'px';
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} else {
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label.style.left = x + 'px';
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};
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return label;
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};
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/**
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* Create a minor line for the axis at position x
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* @param {Number} x
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* @param {Number} width
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* @param {String} orientation "top" or "bottom" (default)
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* @param {String} className
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* @return {Element} Returns the created line
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* @private
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*/
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TimeAxis.prototype._repaintMinorLine = function (x, width, orientation, className) {
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// reuse redundant line
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var line = this.dom.redundant.lines.shift();
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if (!line) {
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// create vertical line
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line = document.createElement('div');
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this.dom.background.appendChild(line);
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}
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this.dom.lines.push(line);
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var props = this.props;
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if (orientation == 'top') {
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line.style.top = props.majorLabelHeight + 'px';
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}
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else {
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line.style.top = this.body.domProps.top.height + 'px';
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}
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line.style.height = props.minorLineHeight + 'px';
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if (this.options.rtl) {
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line.style.left = "";
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line.style.right = (x - props.minorLineWidth / 2) + 'px';
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line.className = 'vis-grid vis-vertical-rtl vis-minor ' + className;
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} else {
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line.style.left = (x - props.minorLineWidth / 2) + 'px';
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line.className = 'vis-grid vis-vertical vis-minor ' + className;
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};
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line.style.width = width + 'px';
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return line;
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};
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/**
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* Create a Major line for the axis at position x
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* @param {Number} x
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* @param {Number} width
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* @param {String} orientation "top" or "bottom" (default)
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* @param {String} className
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* @return {Element} Returns the created line
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* @private
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*/
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TimeAxis.prototype._repaintMajorLine = function (x, width, orientation, className) {
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// reuse redundant line
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var line = this.dom.redundant.lines.shift();
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if (!line) {
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// create vertical line
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line = document.createElement('div');
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this.dom.background.appendChild(line);
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}
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this.dom.lines.push(line);
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var props = this.props;
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if (orientation == 'top') {
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line.style.top = '0';
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}
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else {
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line.style.top = this.body.domProps.top.height + 'px';
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}
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if (this.options.rtl) {
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line.style.left = "";
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line.style.right = (x - props.majorLineWidth / 2) + 'px';
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line.className = 'vis-grid vis-vertical-rtl vis-major ' + className;
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} else {
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line.style.left = (x - props.majorLineWidth / 2) + 'px';
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line.className = 'vis-grid vis-vertical vis-major ' + className;
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}
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line.style.height = props.majorLineHeight + 'px';
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line.style.width = width + 'px';
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return line;
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};
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/**
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* Determine the size of text on the axis (both major and minor axis).
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* The size is calculated only once and then cached in this.props.
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* @private
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*/
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TimeAxis.prototype._calculateCharSize = function () {
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// Note: We calculate char size with every redraw. Size may change, for
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// example when any of the timelines parents had display:none for example.
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// determine the char width and height on the minor axis
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if (!this.dom.measureCharMinor) {
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this.dom.measureCharMinor = document.createElement('DIV');
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this.dom.measureCharMinor.className = 'vis-text vis-minor vis-measure';
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this.dom.measureCharMinor.style.position = 'absolute';
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this.dom.measureCharMinor.appendChild(document.createTextNode('0'));
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this.dom.foreground.appendChild(this.dom.measureCharMinor);
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}
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this.props.minorCharHeight = this.dom.measureCharMinor.clientHeight;
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this.props.minorCharWidth = this.dom.measureCharMinor.clientWidth;
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// determine the char width and height on the major axis
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if (!this.dom.measureCharMajor) {
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this.dom.measureCharMajor = document.createElement('DIV');
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this.dom.measureCharMajor.className = 'vis-text vis-major vis-measure';
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this.dom.measureCharMajor.style.position = 'absolute';
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this.dom.measureCharMajor.appendChild(document.createTextNode('0'));
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this.dom.foreground.appendChild(this.dom.measureCharMajor);
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}
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this.props.majorCharHeight = this.dom.measureCharMajor.clientHeight;
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this.props.majorCharWidth = this.dom.measureCharMajor.clientWidth;
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};
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var warnedForOverflow = false;
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module.exports = TimeAxis;
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