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