vis.js is a dynamic, browser-based visualization library
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var util = require('../../util');
var stack = require('../Stack');
var RangeItem = require('./item/RangeItem');
/**
* @constructor Group
* @param {Number | String} groupId
* @param {Object} data
* @param {ItemSet} itemSet
*/
function Group (groupId, data, itemSet) {
this.groupId = groupId;
this.subgroups = {};
this.subgroupIndex = 0;
this.subgroupOrderer = data && data.subgroupOrder;
this.itemSet = itemSet;
this.isVisible = null;
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 = {
byStart: [],
byEnd: []
};
this.checkRangedItems = false; // needed to refresh the ranged items if the window is programatically changed with NO overlap.
var me = this;
this.itemSet.body.emitter.on("checkRangedItems", function () {
me.checkRangedItems = true;
})
this._create();
this.setData(data);
}
/**
* Create DOM elements for the group
* @private
*/
Group.prototype._create = function() {
var label = document.createElement('div');
if (this.itemSet.options.groupEditable.order) {
label.className = 'vis-label draggable';
} else {
label.className = 'vis-label';
}
this.dom.label = label;
var inner = document.createElement('div');
inner.className = 'vis-inner';
label.appendChild(inner);
this.dom.inner = inner;
var foreground = document.createElement('div');
foreground.className = 'vis-group';
foreground['timeline-group'] = this;
this.dom.foreground = foreground;
this.dom.background = document.createElement('div');
this.dom.background.className = 'vis-group';
this.dom.axis = document.createElement('div');
this.dom.axis.className = 'vis-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;
var templateFunction;
if (this.itemSet.options && this.itemSet.options.groupTemplate) {
templateFunction = this.itemSet.options.groupTemplate.bind(this);
content = templateFunction(data, this.dom.inner);
} else {
content = data && data.content;
}
if (content instanceof Element) {
this.dom.inner.appendChild(content);
while (this.dom.inner.firstChild) {
this.dom.inner.removeChild(this.dom.inner.firstChild);
}
this.dom.inner.appendChild(content);
} else if (content instanceof Object) {
templateFunction(data, this.dom.inner);
} 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, 'vis-hidden');
}
else {
util.removeClassName(this.dom.inner, 'vis-hidden');
}
// update className
var className = data && data.className || null;
if (className != this.className) {
if (this.className) {
util.removeClassName(this.dom.label, this.className);
util.removeClassName(this.dom.foreground, this.className);
util.removeClassName(this.dom.background, this.className);
util.removeClassName(this.dom.axis, this.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);
this.className = className;
}
// update style
if (this.style) {
util.removeCssText(this.dom.label, this.style);
this.style = null;
}
if (data && data.style) {
util.addCssText(this.dom.label, data.style);
this.style = data.style;
}
};
/**
* 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;
// 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;
}
// recalculate the height of the subgroups
this._calculateSubGroupHeights();
this.isVisible = this._isGroupVisible(range, margin);
// calculate actual size and position
var foreground = this.dom.foreground;
this.top = foreground.offsetTop;
this.right = foreground.offsetLeft;
this.width = foreground.offsetWidth;
this.isVisible = this._isGroupVisible(range, margin);
// reposition visible items vertically
if (typeof this.itemSet.options.order === 'function') {
// a custom order function
if (restack) {
// brute force restack of all items
// show all items
var me = this;
var limitSize = false;
util.forEach(this.items, function (item) {
if (!item.displayed) {
item.redraw();
me.visibleItems.push(item);
}
item.repositionX(limitSize);
});
// order all items and force a restacking
var customOrderedItems = this.orderedItems.byStart.slice().sort(function (a, b) {
return me.itemSet.options.order(a.data, b.data);
});
stack.stack(customOrderedItems, margin, true /* restack=true */);
}
this.visibleItems = this._updateVisibleItems(this.orderedItems, this.visibleItems, range);
}
else {
// no custom order function, lazy stacking
this.visibleItems = this._updateVisibleItems(this.orderedItems, this.visibleItems, range);
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, this.subgroups);
}
}
if (!this.isVisible && this.height) {
return resized = false;
}
// recalculate the height of the group
var height = this._calculateHeight(margin);
// calculate actual size and position
var foreground = this.dom.foreground;
this.top = foreground.offsetTop;
this.right = 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(margin);
}
return resized;
};
/**
* recalculate the height of the subgroups
* @private
*/
Group.prototype._calculateSubGroupHeights = function () {
if (Object.keys(this.subgroups).length > 0) {
var me = this;
this.resetSubgroups();
util.forEach(this.visibleItems, function (item) {
if (item.data.subgroup !== undefined) {
me.subgroups[item.data.subgroup].height = Math.max(me.subgroups[item.data.subgroup].height, item.height);
me.subgroups[item.data.subgroup].visible = true;
}
});
}
};
/**
* check if group is visible
* @private
*/
Group.prototype._isGroupVisible = function (range, margin) {
var isVisible =
(this.top <= range.body.domProps.centerContainer.height - range.body.domProps.scrollTop + margin.axis)
&& (this.top + this.height + margin.axis >= - range.body.domProps.scrollTop);
return isVisible;
}
/**
* recalculate the height of the group
* @param {{item: {horizontal: number, vertical: number}, axis: number}} margin
* @returns {number} Returns the height
* @private
*/
Group.prototype._calculateHeight = function (margin) {
// recalculate the height of the group
var height;
var visibleItems = this.visibleItems;
if (visibleItems.length > 0) {
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 = 0;
}
height = Math.max(height, this.props.label.height);
return height;
};
/**
* 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);
// add to
if (item.data.subgroup !== undefined) {
if (this.subgroups[item.data.subgroup] === undefined) {
this.subgroups[item.data.subgroup] = {height:0, visible: false, index:this.subgroupIndex, items: []};
this.subgroupIndex++;
}
this.subgroups[item.data.subgroup].items.push(item);
}
this.orderSubgroups();
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);
}
};
Group.prototype.orderSubgroups = function() {
if (this.subgroupOrderer !== undefined) {
var sortArray = [];
if (typeof this.subgroupOrderer == 'string') {
for (var subgroup in this.subgroups) {
sortArray.push({subgroup: subgroup, sortField: this.subgroups[subgroup].items[0].data[this.subgroupOrderer]})
}
sortArray.sort(function (a, b) {
return a.sortField - b.sortField;
})
}
else if (typeof this.subgroupOrderer == 'function') {
for (var subgroup in this.subgroups) {
sortArray.push(this.subgroups[subgroup].items[0].data);
}
sortArray.sort(this.subgroupOrderer);
}
if (sortArray.length > 0) {
for (var i = 0; i < sortArray.length; i++) {
this.subgroups[sortArray[i].subgroup].index = i;
}
}
}
};
Group.prototype.resetSubgroups = function() {
for (var subgroup in this.subgroups) {
if (this.subgroups.hasOwnProperty(subgroup)) {
this.subgroups[subgroup].visible = false;
}
}
};
/**
* Remove an item from the group
* @param {Item} item
*/
Group.prototype.remove = function(item) {
delete this.items[item.id];
item.setParent(null);
// remove from visible items
var index = this.visibleItems.indexOf(item);
if (index != -1) this.visibleItems.splice(index, 1);
if(item.data.subgroup !== undefined){
var subgroup = this.subgroups[item.data.subgroup];
if (subgroup){
var itemIndex = subgroup.items.indexOf(item);
subgroup.items.splice(itemIndex,1);
if (!subgroup.items.length){
delete this.subgroups[item.data.subgroup];
this.subgroupIndex--;
}
this.orderSubgroups();
}
}
};
/**
* 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);
var startArray = [];
var endArray = [];
for (var i = 0; i < array.length; i++) {
if (array[i].data.end !== undefined) {
endArray.push(array[i]);
}
startArray.push(array[i]);
}
this.orderedItems = {
byStart: startArray,
byEnd: endArray
};
stack.orderByStart(this.orderedItems.byStart);
stack.orderByEnd(this.orderedItems.byEnd);
};
/**
* 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, oldVisibleItems, range) {
var visibleItems = [];
var visibleItemsLookup = {}; // we keep this to quickly look up if an item already exists in the list without using indexOf on visibleItems
if (!this.isVisible && this.groupId != "__background__") {
for (var i = 0; i < oldVisibleItems.length; i++) {
var item = oldVisibleItems[i];
if (item.displayed) item.hide();
}
return visibleItems;
}
var interval = (range.end - range.start) / 4;
var lowerBound = range.start - interval;
var upperBound = range.end + interval;
// this function is used to do the binary search.
var searchFunction = function (value) {
if (value < lowerBound) {return -1;}
else if (value <= upperBound) {return 0;}
else {return 1;}
}
// first check if the items that were in view previously are still in view.
// IMPORTANT: this handles the case for the items with startdate before the window and enddate after the window!
// also cleans up invisible items.
if (oldVisibleItems.length > 0) {
for (var i = 0; i < oldVisibleItems.length; i++) {
this._checkIfVisibleWithReference(oldVisibleItems[i], visibleItems, visibleItemsLookup, range);
}
}
// we do a binary search for the items that have only start values.
var initialPosByStart = util.binarySearchCustom(orderedItems.byStart, searchFunction, 'data','start');
// trace the visible items from the inital start pos both ways until an invisible item is found, we only look at the start values.
this._traceVisible(initialPosByStart, orderedItems.byStart, visibleItems, visibleItemsLookup, function (item) {
return (item.data.start < lowerBound || item.data.start > upperBound);
});
// if the window has changed programmatically without overlapping the old window, the ranged items with start < lowerBound and end > upperbound are not shown.
// We therefore have to brute force check all items in the byEnd list
if (this.checkRangedItems == true) {
this.checkRangedItems = false;
for (i = 0; i < orderedItems.byEnd.length; i++) {
this._checkIfVisibleWithReference(orderedItems.byEnd[i], visibleItems, visibleItemsLookup, range);
}
}
else {
// we do a binary search for the items that have defined end times.
var initialPosByEnd = util.binarySearchCustom(orderedItems.byEnd, searchFunction, 'data','end');
// trace the visible items from the inital start pos both ways until an invisible item is found, we only look at the end values.
this._traceVisible(initialPosByEnd, orderedItems.byEnd, visibleItems, visibleItemsLookup, function (item) {
return (item.data.end < lowerBound || item.data.end > upperBound);
});
}
// finally, we reposition all the visible items.
for (var i = 0; i < visibleItems.length; i++) {
var item = visibleItems[i];
if (!item.displayed) item.show();
// reposition item horizontally
item.repositionX();
}
return visibleItems;
};
Group.prototype._traceVisible = function (initialPos, items, visibleItems, visibleItemsLookup, breakCondition) {
if (initialPos != -1) {
for (var i = initialPos; i >= 0; i--) {
var item = items[i];
if (breakCondition(item)) {
break;
}
else {
if (visibleItemsLookup[item.id] === undefined) {
visibleItemsLookup[item.id] = true;
visibleItems.push(item);
}
}
}
for (var i = initialPos + 1; i < items.length; i++) {
var item = items[i];
if (breakCondition(item)) {
break;
}
else {
if (visibleItemsLookup[item.id] === undefined) {
visibleItemsLookup[item.id] = true;
visibleItems.push(item);
}
}
}
}
}
/**
* 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();
}
};
/**
* 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._checkIfVisibleWithReference = function(item, visibleItems, visibleItemsLookup, range) {
if (item.isVisible(range)) {
if (visibleItemsLookup[item.id] === undefined) {
visibleItemsLookup[item.id] = true;
visibleItems.push(item);
}
}
else {
if (item.displayed) item.hide();
}
};
module.exports = Group;