vis.js is a dynamic, browser-based visualization library
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var util = require('../../util');
var Component = require('./Component');
var TimeStep = require('../TimeStep');
var moment = require('../../module/moment');
/**
* A horizontal time axis
* @param {{dom: Object, domProps: Object, emitter: Emitter, range: Range}} body
* @param {Object} [options] See TimeAxis.setOptions for the available
* options.
* @constructor TimeAxis
* @extends Component
*/
function TimeAxis (body, options) {
this.dom = {
foreground: null,
majorLines: [],
majorTexts: [],
minorLines: [],
minorTexts: [],
redundant: {
majorLines: [],
majorTexts: [],
minorLines: [],
minorTexts: []
}
};
this.props = {
range: {
start: 0,
end: 0,
minimumStep: 0
},
lineTop: 0
};
this.defaultOptions = {
orientation: 'bottom', // supported: 'top', 'bottom'
// TODO: implement timeaxis orientations 'left' and 'right'
showMinorLabels: true,
showMajorLabels: true
};
this.options = util.extend({}, this.defaultOptions);
this.body = body;
// create the HTML DOM
this._create();
this.setOptions(options);
}
TimeAxis.prototype = new Component();
/**
* Set options for the TimeAxis.
* Parameters will be merged in current options.
* @param {Object} options Available options:
* {string} [orientation]
* {boolean} [showMinorLabels]
* {boolean} [showMajorLabels]
*/
TimeAxis.prototype.setOptions = function(options) {
if (options) {
// copy all options that we know
util.selectiveExtend(['orientation', 'showMinorLabels', 'showMajorLabels'], this.options, options);
// apply locale to moment.js
// TODO: not so nice, this is applied globally to moment.js
if ('locale' in options) {
if (typeof moment.locale === 'function') {
// moment.js 2.8.1+
moment.locale(options.locale);
}
else {
moment.lang(options.locale);
}
}
}
};
/**
* Create the HTML DOM for the TimeAxis
*/
TimeAxis.prototype._create = function() {
this.dom.foreground = document.createElement('div');
this.dom.background = document.createElement('div');
this.dom.foreground.className = 'timeaxis foreground';
this.dom.background.className = 'timeaxis background';
};
/**
* Destroy the TimeAxis
*/
TimeAxis.prototype.destroy = function() {
// remove from DOM
if (this.dom.foreground.parentNode) {
this.dom.foreground.parentNode.removeChild(this.dom.foreground);
}
if (this.dom.background.parentNode) {
this.dom.background.parentNode.removeChild(this.dom.background);
}
this.body = null;
};
/**
* Repaint the component
* @return {boolean} Returns true if the component is resized
*/
TimeAxis.prototype.redraw = function () {
var options = this.options,
props = this.props,
foreground = this.dom.foreground,
background = this.dom.background;
// determine the correct parent DOM element (depending on option orientation)
var parent = (options.orientation == 'top') ? this.body.dom.top : this.body.dom.bottom;
var parentChanged = (foreground.parentNode !== parent);
// calculate character width and height
this._calculateCharSize();
// TODO: recalculate sizes only needed when parent is resized or options is changed
var orientation = this.options.orientation,
showMinorLabels = this.options.showMinorLabels,
showMajorLabels = this.options.showMajorLabels;
// determine the width and height of the elemens for the axis
props.minorLabelHeight = showMinorLabels ? props.minorCharHeight : 0;
props.majorLabelHeight = showMajorLabels ? props.majorCharHeight : 0;
props.height = props.minorLabelHeight + props.majorLabelHeight;
props.width = foreground.offsetWidth;
props.minorLineHeight = this.body.domProps.root.height - props.majorLabelHeight -
(options.orientation == 'top' ? this.body.domProps.bottom.height : this.body.domProps.top.height);
props.minorLineWidth = 1; // TODO: really calculate width
props.majorLineHeight = props.minorLineHeight + props.majorLabelHeight;
props.majorLineWidth = 1; // TODO: really calculate width
// take foreground and background offline while updating (is almost twice as fast)
var foregroundNextSibling = foreground.nextSibling;
var backgroundNextSibling = background.nextSibling;
foreground.parentNode && foreground.parentNode.removeChild(foreground);
background.parentNode && background.parentNode.removeChild(background);
foreground.style.height = this.props.height + 'px';
this._repaintLabels();
// put DOM online again (at the same place)
if (foregroundNextSibling) {
parent.insertBefore(foreground, foregroundNextSibling);
}
else {
parent.appendChild(foreground)
}
if (backgroundNextSibling) {
this.body.dom.backgroundVertical.insertBefore(background, backgroundNextSibling);
}
else {
this.body.dom.backgroundVertical.appendChild(background)
}
return this._isResized() || parentChanged;
};
/**
* Repaint major and minor text labels and vertical grid lines
* @private
*/
TimeAxis.prototype._repaintLabels = function () {
var orientation = this.options.orientation;
// calculate range and step (step such that we have space for 7 characters per label)
var start = util.convert(this.body.range.start, 'Number'),
end = util.convert(this.body.range.end, 'Number'),
minimumStep = this.body.util.toTime((this.props.minorCharWidth || 10) * 7).valueOf()
-this.body.util.toTime(0).valueOf();
var step = new TimeStep(new Date(start), new Date(end), minimumStep);
this.step = step;
// Move all DOM elements to a "redundant" list, where they
// can be picked for re-use, and clear the lists with lines and texts.
// At the end of the function _repaintLabels, left over elements will be cleaned up
var dom = this.dom;
dom.redundant.majorLines = dom.majorLines;
dom.redundant.majorTexts = dom.majorTexts;
dom.redundant.minorLines = dom.minorLines;
dom.redundant.minorTexts = dom.minorTexts;
dom.majorLines = [];
dom.majorTexts = [];
dom.minorLines = [];
dom.minorTexts = [];
step.first();
var xFirstMajorLabel = undefined;
var max = 0;
while (step.hasNext() && max < 1000) {
max++;
var cur = step.getCurrent(),
x = this.body.util.toScreen(cur),
isMajor = step.isMajor();
// TODO: lines must have a width, such that we can create css backgrounds
if (this.options.showMinorLabels) {
this._repaintMinorText(x, step.getLabelMinor(), orientation);
}
if (isMajor && this.options.showMajorLabels) {
if (x > 0) {
if (xFirstMajorLabel == undefined) {
xFirstMajorLabel = x;
}
this._repaintMajorText(x, step.getLabelMajor(), orientation);
}
this._repaintMajorLine(x, orientation);
}
else {
this._repaintMinorLine(x, orientation);
}
step.next();
}
// create a major label on the left when needed
if (this.options.showMajorLabels) {
var leftTime = this.body.util.toTime(0),
leftText = step.getLabelMajor(leftTime),
widthText = leftText.length * (this.props.majorCharWidth || 10) + 10; // upper bound estimation
if (xFirstMajorLabel == undefined || widthText < xFirstMajorLabel) {
this._repaintMajorText(0, leftText, orientation);
}
}
// Cleanup leftover DOM elements from the redundant list
util.forEach(this.dom.redundant, function (arr) {
while (arr.length) {
var elem = arr.pop();
if (elem && elem.parentNode) {
elem.parentNode.removeChild(elem);
}
}
});
};
/**
* Create a minor label for the axis at position x
* @param {Number} x
* @param {String} text
* @param {String} orientation "top" or "bottom" (default)
* @private
*/
TimeAxis.prototype._repaintMinorText = function (x, text, orientation) {
// reuse redundant label
var label = this.dom.redundant.minorTexts.shift();
if (!label) {
// create new label
var content = document.createTextNode('');
label = document.createElement('div');
label.appendChild(content);
label.className = 'text minor';
this.dom.foreground.appendChild(label);
}
this.dom.minorTexts.push(label);
label.childNodes[0].nodeValue = text;
label.style.top = (orientation == 'top') ? (this.props.majorLabelHeight + 'px') : '0';
label.style.left = x + 'px';
//label.title = title; // TODO: this is a heavy operation
};
/**
* Create a Major label for the axis at position x
* @param {Number} x
* @param {String} text
* @param {String} orientation "top" or "bottom" (default)
* @private
*/
TimeAxis.prototype._repaintMajorText = function (x, text, orientation) {
// reuse redundant label
var label = this.dom.redundant.majorTexts.shift();
if (!label) {
// create label
var content = document.createTextNode(text);
label = document.createElement('div');
label.className = 'text major';
label.appendChild(content);
this.dom.foreground.appendChild(label);
}
this.dom.majorTexts.push(label);
label.childNodes[0].nodeValue = text;
//label.title = title; // TODO: this is a heavy operation
label.style.top = (orientation == 'top') ? '0' : (this.props.minorLabelHeight + 'px');
label.style.left = x + 'px';
};
/**
* Create a minor line for the axis at position x
* @param {Number} x
* @param {String} orientation "top" or "bottom" (default)
* @private
*/
TimeAxis.prototype._repaintMinorLine = function (x, orientation) {
// reuse redundant line
var line = this.dom.redundant.minorLines.shift();
if (!line) {
// create vertical line
line = document.createElement('div');
line.className = 'grid vertical minor';
this.dom.background.appendChild(line);
}
this.dom.minorLines.push(line);
var props = this.props;
if (orientation == 'top') {
line.style.top = props.majorLabelHeight + 'px';
}
else {
line.style.top = this.body.domProps.top.height + 'px';
}
line.style.height = props.minorLineHeight + 'px';
line.style.left = (x - props.minorLineWidth / 2) + 'px';
};
/**
* Create a Major line for the axis at position x
* @param {Number} x
* @param {String} orientation "top" or "bottom" (default)
* @private
*/
TimeAxis.prototype._repaintMajorLine = function (x, orientation) {
// reuse redundant line
var line = this.dom.redundant.majorLines.shift();
if (!line) {
// create vertical line
line = document.createElement('DIV');
line.className = 'grid vertical major';
this.dom.background.appendChild(line);
}
this.dom.majorLines.push(line);
var props = this.props;
if (orientation == 'top') {
line.style.top = '0';
}
else {
line.style.top = this.body.domProps.top.height + 'px';
}
line.style.left = (x - props.majorLineWidth / 2) + 'px';
line.style.height = props.majorLineHeight + 'px';
};
/**
* Determine the size of text on the axis (both major and minor axis).
* The size is calculated only once and then cached in this.props.
* @private
*/
TimeAxis.prototype._calculateCharSize = function () {
// Note: We calculate char size with every redraw. Size may change, for
// example when any of the timelines parents had display:none for example.
// determine the char width and height on the minor axis
if (!this.dom.measureCharMinor) {
this.dom.measureCharMinor = document.createElement('DIV');
this.dom.measureCharMinor.className = 'text minor measure';
this.dom.measureCharMinor.style.position = 'absolute';
this.dom.measureCharMinor.appendChild(document.createTextNode('0'));
this.dom.foreground.appendChild(this.dom.measureCharMinor);
}
this.props.minorCharHeight = this.dom.measureCharMinor.clientHeight;
this.props.minorCharWidth = this.dom.measureCharMinor.clientWidth;
// determine the char width and height on the major axis
if (!this.dom.measureCharMajor) {
this.dom.measureCharMajor = document.createElement('DIV');
this.dom.measureCharMajor.className = 'text major measure';
this.dom.measureCharMajor.style.position = 'absolute';
this.dom.measureCharMajor.appendChild(document.createTextNode('0'));
this.dom.foreground.appendChild(this.dom.measureCharMajor);
}
this.props.majorCharHeight = this.dom.measureCharMajor.clientHeight;
this.props.majorCharWidth = this.dom.measureCharMajor.clientWidth;
};
/**
* Snap a date to a rounded value.
* The snap intervals are dependent on the current scale and step.
* @param {Date} date the date to be snapped.
* @return {Date} snappedDate
*/
TimeAxis.prototype.snap = function(date) {
return this.step.snap(date);
};
module.exports = TimeAxis;