vis.js is a dynamic, browser-based visualization library
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var util = require('../../util');
var DOMutil = require('../../DOMutil');
var Component = require('./Component');
/**
* Legend for Graph2d
*/
function Legend(body, options, side, linegraphOptions) {
this.body = body;
this.defaultOptions = {
enabled: false,
icons: true,
iconSize: 20,
iconSpacing: 6,
left: {
visible: true,
position: 'top-left' // top/bottom - left,center,right
},
right: {
visible: true,
position: 'top-right' // top/bottom - left,center,right
}
}
this.side = side;
this.options = util.extend({},this.defaultOptions);
this.linegraphOptions = linegraphOptions;
this.svgElements = {};
this.dom = {};
this.groups = {};
this.amountOfGroups = 0;
this._create();
this.framework = {svg: this.svg, svgElements: this.svgElements, options: this.options, groups: this.groups};
this.setOptions(options);
}
Legend.prototype = new Component();
Legend.prototype.clear = function() {
this.groups = {};
this.amountOfGroups = 0;
};
Legend.prototype.addGroup = function(label, graphOptions) {
// Include a group only if the group option 'excludeFromLegend: false' is not set.
if (graphOptions.options.excludeFromLegend != true) {
if (!this.groups.hasOwnProperty(label)) {
this.groups[label] = graphOptions;
}
this.amountOfGroups += 1;
}
};
Legend.prototype.updateGroup = function(label, graphOptions) {
this.groups[label] = graphOptions;
};
Legend.prototype.removeGroup = function(label) {
if (this.groups.hasOwnProperty(label)) {
delete this.groups[label];
this.amountOfGroups -= 1;
}
};
Legend.prototype._create = function() {
this.dom.frame = document.createElement('div');
this.dom.frame.className = 'vis-legend';
this.dom.frame.style.position = "absolute";
this.dom.frame.style.top = "10px";
this.dom.frame.style.display = "block";
this.dom.textArea = document.createElement('div');
this.dom.textArea.className = 'vis-legend-text';
this.dom.textArea.style.position = "relative";
this.dom.textArea.style.top = "0px";
this.svg = document.createElementNS('http://www.w3.org/2000/svg',"svg");
this.svg.style.position = 'absolute';
this.svg.style.top = 0 +'px';
this.svg.style.width = this.options.iconSize + 5 + 'px';
this.svg.style.height = '100%';
this.dom.frame.appendChild(this.svg);
this.dom.frame.appendChild(this.dom.textArea);
};
/**
* Hide the component from the DOM
*/
Legend.prototype.hide = function() {
// remove the frame containing the items
if (this.dom.frame.parentNode) {
this.dom.frame.parentNode.removeChild(this.dom.frame);
}
};
/**
* Show the component in the DOM (when not already visible).
* @return {Boolean} changed
*/
Legend.prototype.show = function() {
// show frame containing the items
if (!this.dom.frame.parentNode) {
this.body.dom.center.appendChild(this.dom.frame);
}
};
Legend.prototype.setOptions = function(options) {
var fields = ['enabled','orientation','icons','left','right'];
util.selectiveDeepExtend(fields, this.options, options);
};
Legend.prototype.redraw = function() {
var activeGroups = 0;
var groupArray = Object.keys(this.groups);
groupArray.sort(function (a,b) {
return (a < b ? -1 : 1);
})
for (var i = 0; i < groupArray.length; i++) {
var groupId = groupArray[i];
if (this.groups[groupId].visible == true && (this.linegraphOptions.visibility[groupId] === undefined || this.linegraphOptions.visibility[groupId] == true)) {
activeGroups++;
}
}
if (this.options[this.side].visible == false || this.amountOfGroups == 0 || this.options.enabled == false || activeGroups == 0) {
this.hide();
}
else {
this.show();
if (this.options[this.side].position == 'top-left' || this.options[this.side].position == 'bottom-left') {
this.dom.frame.style.left = '4px';
this.dom.frame.style.textAlign = "left";
this.dom.textArea.style.textAlign = "left";
this.dom.textArea.style.left = (this.options.iconSize + 15) + 'px';
this.dom.textArea.style.right = '';
this.svg.style.left = 0 +'px';
this.svg.style.right = '';
}
else {
this.dom.frame.style.right = '4px';
this.dom.frame.style.textAlign = "right";
this.dom.textArea.style.textAlign = "right";
this.dom.textArea.style.right = (this.options.iconSize + 15) + 'px';
this.dom.textArea.style.left = '';
this.svg.style.right = 0 +'px';
this.svg.style.left = '';
}
if (this.options[this.side].position == 'top-left' || this.options[this.side].position == 'top-right') {
this.dom.frame.style.top = 4 - Number(this.body.dom.center.style.top.replace("px","")) + 'px';
this.dom.frame.style.bottom = '';
}
else {
var scrollableHeight = this.body.domProps.center.height - this.body.domProps.centerContainer.height;
this.dom.frame.style.bottom = 4 + scrollableHeight + Number(this.body.dom.center.style.top.replace("px","")) + 'px';
this.dom.frame.style.top = '';
}
if (this.options.icons == false) {
this.dom.frame.style.width = this.dom.textArea.offsetWidth + 10 + 'px';
this.dom.textArea.style.right = '';
this.dom.textArea.style.left = '';
this.svg.style.width = '0px';
}
else {
this.dom.frame.style.width = this.options.iconSize + 15 + this.dom.textArea.offsetWidth + 10 + 'px'
this.drawLegendIcons();
}
var content = '';
for (var i = 0; i < groupArray.length; i++) {
var groupId = groupArray[i];
if (this.groups[groupId].visible == true && (this.linegraphOptions.visibility[groupId] === undefined || this.linegraphOptions.visibility[groupId] == true)) {
content += this.groups[groupId].content + '<br />';
}
}
this.dom.textArea.innerHTML = content;
this.dom.textArea.style.lineHeight = ((0.75 * this.options.iconSize) + this.options.iconSpacing) + 'px';
}
};
Legend.prototype.drawLegendIcons = function() {
if (this.dom.frame.parentNode) {
var groupArray = Object.keys(this.groups);
groupArray.sort(function (a,b) {
return (a < b ? -1 : 1);
});
// this resets the elements so the order is maintained
DOMutil.resetElements(this.svgElements);
var padding = window.getComputedStyle(this.dom.frame).paddingTop;
var iconOffset = Number(padding.replace('px',''));
var x = iconOffset;
var iconWidth = this.options.iconSize;
var iconHeight = 0.75 * this.options.iconSize;
var y = iconOffset + 0.5 * iconHeight + 3;
this.svg.style.width = iconWidth + 5 + iconOffset + 'px';
for (var i = 0; i < groupArray.length; i++) {
var groupId = groupArray[i];
if (this.groups[groupId].visible == true && (this.linegraphOptions.visibility[groupId] === undefined || this.linegraphOptions.visibility[groupId] == true)) {
this.groups[groupId].getLegend(iconWidth, iconHeight, this.framework, x, y);
y += iconHeight + this.options.iconSpacing;
}
}
}
};
module.exports = Legend;