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395 lines
12 KiB
395 lines
12 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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/**
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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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majorLines: [],
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majorTexts: [],
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minorLines: [],
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minorTexts: [],
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redundant: {
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majorLines: [],
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majorTexts: [],
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minorLines: [],
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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: 'bottom', // supported: 'top', 'bottom'
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// TODO: implement timeaxis orientations 'left' and 'right'
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showMinorLabels: true,
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showMajorLabels: true
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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]
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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(['orientation', 'showMinorLabels', 'showMajorLabels'], this.options, options);
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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 = 'timeaxis foreground';
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this.dom.background.className = 'timeaxis 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 options = this.options,
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props = this.props,
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foreground = this.dom.foreground,
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background = this.dom.background;
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// determine the correct parent DOM element (depending on option orientation)
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var parent = (options.orientation == '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 orientation = this.options.orientation,
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showMinorLabels = this.options.showMinorLabels,
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showMajorLabels = this.options.showMajorLabels;
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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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(options.orientation == '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;
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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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end = util.convert(this.body.range.end, 'Number'),
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minimumStep = this.body.util.toTime((this.props.minorCharWidth || 10) * 7).valueOf()
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-this.body.util.toTime(0).valueOf();
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var step = new TimeStep(new Date(start), new Date(end), minimumStep);
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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.majorLines = dom.majorLines;
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dom.redundant.majorTexts = dom.majorTexts;
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dom.redundant.minorLines = dom.minorLines;
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dom.redundant.minorTexts = dom.minorTexts;
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dom.majorLines = [];
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dom.majorTexts = [];
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dom.minorLines = [];
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dom.minorTexts = [];
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step.first();
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var xFirstMajorLabel = undefined;
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var max = 0;
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while (step.hasNext() && max < 1000) {
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max++;
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var cur = step.getCurrent(),
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x = this.body.util.toScreen(cur),
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isMajor = step.isMajor();
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// TODO: lines must have a width, such that we can create css backgrounds
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if (this.options.showMinorLabels) {
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this._repaintMinorText(x, step.getLabelMinor(), orientation);
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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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this._repaintMajorText(x, step.getLabelMajor(), orientation);
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}
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this._repaintMajorLine(x, orientation);
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}
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else {
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this._repaintMinorLine(x, orientation);
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}
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step.next();
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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);
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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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* @private
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*/
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TimeAxis.prototype._repaintMinorText = function (x, text, orientation) {
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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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label.className = 'text minor';
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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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label.style.left = x + 'px';
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//label.title = title; // TODO: this is a heavy operation
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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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* @private
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*/
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TimeAxis.prototype._repaintMajorText = function (x, text, orientation) {
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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.className = 'text major';
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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.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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label.style.left = x + 'px';
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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 {String} orientation "top" or "bottom" (default)
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* @private
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*/
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TimeAxis.prototype._repaintMinorLine = function (x, orientation) {
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// reuse redundant line
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var line = this.dom.redundant.minorLines.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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line.className = 'grid vertical minor';
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this.dom.background.appendChild(line);
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}
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this.dom.minorLines.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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line.style.left = (x - props.minorLineWidth / 2) + 'px';
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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 {String} orientation "top" or "bottom" (default)
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* @private
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*/
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TimeAxis.prototype._repaintMajorLine = function (x, orientation) {
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// reuse redundant line
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var line = this.dom.redundant.majorLines.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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line.className = 'grid vertical major';
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this.dom.background.appendChild(line);
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}
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this.dom.majorLines.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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line.style.left = (x - props.majorLineWidth / 2) + 'px';
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line.style.height = props.majorLineHeight + 'px';
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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 = 'text minor 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 = 'text minor 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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/**
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* Snap a date to a rounded value.
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* The snap intervals are dependent on the current scale and step.
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* @param {Date} date the date to be snapped.
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* @return {Date} snappedDate
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*/
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TimeAxis.prototype.snap = function(date) {
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return this.step.snap(date);
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};
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module.exports = TimeAxis;
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