vis.js is a dynamic, browser-based visualization library
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var util = require('../../util');
var stack = require('../Stack');
var ItemRange = require('./item/ItemRange');
/**
* @constructor Group
* @param {Number | String} groupId
* @param {Object} data
* @param {ItemSet} itemSet
*/
function Group (groupId, data, itemSet) {
this.groupId = groupId;
this.itemSet = itemSet;
this.dom = {};
this.props = {
label: {
width: 0,
height: 0
}
};
this.className = null;
this.items = {}; // items filtered by groupId of this group
this.visibleItems = []; // items currently visible in window
this.orderedItems = { // items sorted by start and by end
byStart: [],
byEnd: []
};
this._create();
this.setData(data);
}
/**
* Create DOM elements for the group
* @private
*/
Group.prototype._create = function() {
var label = document.createElement('div');
label.className = 'vlabel';
this.dom.label = label;
var inner = document.createElement('div');
inner.className = 'inner';
label.appendChild(inner);
this.dom.inner = inner;
var foreground = document.createElement('div');
foreground.className = 'group';
foreground['timeline-group'] = this;
this.dom.foreground = foreground;
this.dom.background = document.createElement('div');
this.dom.background.className = 'group';
this.dom.axis = document.createElement('div');
this.dom.axis.className = 'group';
// create a hidden marker to detect when the Timelines container is attached
// to the DOM, or the style of a parent of the Timeline is changed from
// display:none is changed to visible.
this.dom.marker = document.createElement('div');
this.dom.marker.style.visibility = 'hidden';
this.dom.marker.innerHTML = '?';
this.dom.background.appendChild(this.dom.marker);
};
/**
* Set the group data for this group
* @param {Object} data Group data, can contain properties content and className
*/
Group.prototype.setData = function(data) {
// update contents
var content = data && data.content;
if (content instanceof Element) {
this.dom.inner.appendChild(content);
}
else if (content !== undefined && content !== null) {
this.dom.inner.innerHTML = content;
}
else {
this.dom.inner.innerHTML = this.groupId || ''; // groupId can be null
}
// update title
this.dom.label.title = data && data.title || '';
if (!this.dom.inner.firstChild) {
util.addClassName(this.dom.inner, 'hidden');
}
else {
util.removeClassName(this.dom.inner, 'hidden');
}
// update className
var className = data && data.className || null;
if (className != this.className) {
if (this.className) {
util.removeClassName(this.dom.label, className);
util.removeClassName(this.dom.foreground, className);
util.removeClassName(this.dom.background, className);
util.removeClassName(this.dom.axis, className);
}
util.addClassName(this.dom.label, className);
util.addClassName(this.dom.foreground, className);
util.addClassName(this.dom.background, className);
util.addClassName(this.dom.axis, className);
}
};
/**
* Get the width of the group label
* @return {number} width
*/
Group.prototype.getLabelWidth = function() {
return this.props.label.width;
};
/**
* Repaint this group
* @param {{start: number, end: number}} range
* @param {{item: {horizontal: number, vertical: number}, axis: number}} margin
* @param {boolean} [restack=false] Force restacking of all items
* @return {boolean} Returns true if the group is resized
*/
Group.prototype.redraw = function(range, margin, restack) {
var resized = false;
this.visibleItems = this._updateVisibleItems(this.orderedItems, this.visibleItems, range);
// force recalculation of the height of the items when the marker height changed
// (due to the Timeline being attached to the DOM or changed from display:none to visible)
var markerHeight = this.dom.marker.clientHeight;
if (markerHeight != this.lastMarkerHeight) {
this.lastMarkerHeight = markerHeight;
util.forEach(this.items, function (item) {
item.dirty = true;
if (item.displayed) item.redraw();
});
restack = true;
}
// reposition visible items vertically
if (this.itemSet.options.stack) { // TODO: ugly way to access options...
stack.stack(this.visibleItems, margin, restack);
}
else { // no stacking
stack.nostack(this.visibleItems, margin);
}
// recalculate the height of the group
var height;
var visibleItems = this.visibleItems;
if (visibleItems.length) {
var min = visibleItems[0].top;
var max = visibleItems[0].top + visibleItems[0].height;
util.forEach(visibleItems, function (item) {
min = Math.min(min, item.top);
max = Math.max(max, (item.top + item.height));
});
if (min > margin.axis) {
// there is an empty gap between the lowest item and the axis
var offset = min - margin.axis;
max -= offset;
util.forEach(visibleItems, function (item) {
item.top -= offset;
});
}
height = max + margin.item.vertical / 2;
}
else {
height = margin.axis + margin.item.vertical;
}
height = Math.max(height, this.props.label.height);
// calculate actual size and position
var foreground = this.dom.foreground;
this.top = foreground.offsetTop;
this.left = foreground.offsetLeft;
this.width = foreground.offsetWidth;
resized = util.updateProperty(this, 'height', height) || resized;
// recalculate size of label
resized = util.updateProperty(this.props.label, 'width', this.dom.inner.clientWidth) || resized;
resized = util.updateProperty(this.props.label, 'height', this.dom.inner.clientHeight) || resized;
// apply new height
this.dom.background.style.height = height + 'px';
this.dom.foreground.style.height = height + 'px';
this.dom.label.style.height = height + 'px';
// update vertical position of items after they are re-stacked and the height of the group is calculated
for (var i = 0, ii = this.visibleItems.length; i < ii; i++) {
var item = this.visibleItems[i];
item.repositionY();
}
return resized;
};
/**
* Show this group: attach to the DOM
*/
Group.prototype.show = function() {
if (!this.dom.label.parentNode) {
this.itemSet.dom.labelSet.appendChild(this.dom.label);
}
if (!this.dom.foreground.parentNode) {
this.itemSet.dom.foreground.appendChild(this.dom.foreground);
}
if (!this.dom.background.parentNode) {
this.itemSet.dom.background.appendChild(this.dom.background);
}
if (!this.dom.axis.parentNode) {
this.itemSet.dom.axis.appendChild(this.dom.axis);
}
};
/**
* Hide this group: remove from the DOM
*/
Group.prototype.hide = function() {
var label = this.dom.label;
if (label.parentNode) {
label.parentNode.removeChild(label);
}
var foreground = this.dom.foreground;
if (foreground.parentNode) {
foreground.parentNode.removeChild(foreground);
}
var background = this.dom.background;
if (background.parentNode) {
background.parentNode.removeChild(background);
}
var axis = this.dom.axis;
if (axis.parentNode) {
axis.parentNode.removeChild(axis);
}
};
/**
* Add an item to the group
* @param {Item} item
*/
Group.prototype.add = function(item) {
this.items[item.id] = item;
item.setParent(this);
if (this.visibleItems.indexOf(item) == -1) {
var range = this.itemSet.body.range; // TODO: not nice accessing the range like this
this._checkIfVisible(item, this.visibleItems, range);
}
};
/**
* Remove an item from the group
* @param {Item} item
*/
Group.prototype.remove = function(item) {
delete this.items[item.id];
item.setParent(this.itemSet);
// remove from visible items
var index = this.visibleItems.indexOf(item);
if (index != -1) this.visibleItems.splice(index, 1);
// TODO: also remove from ordered items?
};
/**
* Remove an item from the corresponding DataSet
* @param {Item} item
*/
Group.prototype.removeFromDataSet = function(item) {
this.itemSet.removeItem(item.id);
};
/**
* Reorder the items
*/
Group.prototype.order = function() {
var array = util.toArray(this.items);
this.orderedItems.byStart = array;
this.orderedItems.byEnd = this._constructByEndArray(array);
stack.orderByStart(this.orderedItems.byStart);
stack.orderByEnd(this.orderedItems.byEnd);
};
/**
* Create an array containing all items being a range (having an end date)
* @param {Item[]} array
* @returns {ItemRange[]}
* @private
*/
Group.prototype._constructByEndArray = function(array) {
var endArray = [];
for (var i = 0; i < array.length; i++) {
if (array[i] instanceof ItemRange) {
endArray.push(array[i]);
}
}
return endArray;
};
/**
* Update the visible items
* @param {{byStart: Item[], byEnd: Item[]}} orderedItems All items ordered by start date and by end date
* @param {Item[]} visibleItems The previously visible items.
* @param {{start: number, end: number}} range Visible range
* @return {Item[]} visibleItems The new visible items.
* @private
*/
Group.prototype._updateVisibleItems = function(orderedItems, visibleItems, range) {
var initialPosByStart,
newVisibleItems = [],
i;
// first check if the items that were in view previously are still in view.
// this handles the case for the ItemRange that is both before and after the current one.
if (visibleItems.length > 0) {
for (i = 0; i < visibleItems.length; i++) {
this._checkIfVisible(visibleItems[i], newVisibleItems, range);
}
}
// If there were no visible items previously, use binarySearch to find a visible ItemPoint or ItemRange (based on startTime)
if (newVisibleItems.length == 0) {
initialPosByStart = util.binarySearch(orderedItems.byStart, range, 'data','start');
}
else {
initialPosByStart = orderedItems.byStart.indexOf(newVisibleItems[0]);
}
// use visible search to find a visible ItemRange (only based on endTime)
var initialPosByEnd = util.binarySearch(orderedItems.byEnd, range, 'data','end');
// if we found a initial ID to use, trace it up and down until we meet an invisible item.
if (initialPosByStart != -1) {
for (i = initialPosByStart; i >= 0; i--) {
if (this._checkIfInvisible(orderedItems.byStart[i], newVisibleItems, range)) {break;}
}
for (i = initialPosByStart + 1; i < orderedItems.byStart.length; i++) {
if (this._checkIfInvisible(orderedItems.byStart[i], newVisibleItems, range)) {break;}
}
}
// if we found a initial ID to use, trace it up and down until we meet an invisible item.
if (initialPosByEnd != -1) {
for (i = initialPosByEnd; i >= 0; i--) {
if (this._checkIfInvisible(orderedItems.byEnd[i], newVisibleItems, range)) {break;}
}
for (i = initialPosByEnd + 1; i < orderedItems.byEnd.length; i++) {
if (this._checkIfInvisible(orderedItems.byEnd[i], newVisibleItems, range)) {break;}
}
}
return newVisibleItems;
};
/**
* this function checks if an item is invisible. If it is NOT we make it visible
* and add it to the global visible items. If it is, return true.
*
* @param {Item} item
* @param {Item[]} visibleItems
* @param {{start:number, end:number}} range
* @returns {boolean}
* @private
*/
Group.prototype._checkIfInvisible = function(item, visibleItems, range) {
if (item.isVisible(range)) {
if (!item.displayed) item.show();
item.repositionX();
if (visibleItems.indexOf(item) == -1) {
visibleItems.push(item);
}
return false;
}
else {
if (item.displayed) item.hide();
return true;
}
};
/**
* this function is very similar to the _checkIfInvisible() but it does not
* return booleans, hides the item if it should not be seen and always adds to
* the visibleItems.
* this one is for brute forcing and hiding.
*
* @param {Item} item
* @param {Array} visibleItems
* @param {{start:number, end:number}} range
* @private
*/
Group.prototype._checkIfVisible = function(item, visibleItems, range) {
if (item.isVisible(range)) {
if (!item.displayed) item.show();
// reposition item horizontally
item.repositionX();
visibleItems.push(item);
}
else {
if (item.displayed) item.hide();
}
};
module.exports = Group;