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790 lines
27 KiB
790 lines
27 KiB
var Emitter = require('emitter-component');
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var Hammer = require('../module/hammer');
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var util = require('../util');
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var DataSet = require('../DataSet');
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var DataView = require('../DataView');
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var Range = require('./Range');
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var TimeAxis = require('./component/TimeAxis');
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var CurrentTime = require('./component/CurrentTime');
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var CustomTime = require('./component/CustomTime');
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var ItemSet = require('./component/ItemSet');
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var Activator = require('../shared/Activator');
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/**
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* Create a timeline visualization
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* @param {HTMLElement} container
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* @param {vis.DataSet | Array | google.visualization.DataTable} [items]
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* @param {Object} [options] See Core.setOptions for the available options.
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* @constructor
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*/
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function Core () {}
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// turn Core into an event emitter
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Emitter(Core.prototype);
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/**
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* Create the main DOM for the Core: a root panel containing left, right,
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* top, bottom, content, and background panel.
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* @param {Element} container The container element where the Core will
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* be attached.
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* @private
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*/
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Core.prototype._create = function (container) {
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this.dom = {};
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this.dom.root = document.createElement('div');
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this.dom.background = document.createElement('div');
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this.dom.backgroundVertical = document.createElement('div');
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this.dom.backgroundHorizontal = document.createElement('div');
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this.dom.centerContainer = document.createElement('div');
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this.dom.leftContainer = document.createElement('div');
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this.dom.rightContainer = document.createElement('div');
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this.dom.center = document.createElement('div');
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this.dom.left = document.createElement('div');
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this.dom.right = document.createElement('div');
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this.dom.top = document.createElement('div');
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this.dom.bottom = document.createElement('div');
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this.dom.shadowTop = document.createElement('div');
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this.dom.shadowBottom = document.createElement('div');
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this.dom.shadowTopLeft = document.createElement('div');
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this.dom.shadowBottomLeft = document.createElement('div');
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this.dom.shadowTopRight = document.createElement('div');
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this.dom.shadowBottomRight = document.createElement('div');
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this.dom.root.className = 'vis timeline root';
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this.dom.background.className = 'vispanel background';
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this.dom.backgroundVertical.className = 'vispanel background vertical';
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this.dom.backgroundHorizontal.className = 'vispanel background horizontal';
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this.dom.centerContainer.className = 'vispanel center';
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this.dom.leftContainer.className = 'vispanel left';
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this.dom.rightContainer.className = 'vispanel right';
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this.dom.top.className = 'vispanel top';
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this.dom.bottom.className = 'vispanel bottom';
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this.dom.left.className = 'content';
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this.dom.center.className = 'content';
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this.dom.right.className = 'content';
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this.dom.shadowTop.className = 'shadow top';
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this.dom.shadowBottom.className = 'shadow bottom';
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this.dom.shadowTopLeft.className = 'shadow top';
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this.dom.shadowBottomLeft.className = 'shadow bottom';
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this.dom.shadowTopRight.className = 'shadow top';
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this.dom.shadowBottomRight.className = 'shadow bottom';
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this.dom.root.appendChild(this.dom.background);
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this.dom.root.appendChild(this.dom.backgroundVertical);
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this.dom.root.appendChild(this.dom.backgroundHorizontal);
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this.dom.root.appendChild(this.dom.centerContainer);
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this.dom.root.appendChild(this.dom.leftContainer);
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this.dom.root.appendChild(this.dom.rightContainer);
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this.dom.root.appendChild(this.dom.top);
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this.dom.root.appendChild(this.dom.bottom);
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this.dom.centerContainer.appendChild(this.dom.center);
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this.dom.leftContainer.appendChild(this.dom.left);
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this.dom.rightContainer.appendChild(this.dom.right);
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this.dom.centerContainer.appendChild(this.dom.shadowTop);
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this.dom.centerContainer.appendChild(this.dom.shadowBottom);
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this.dom.leftContainer.appendChild(this.dom.shadowTopLeft);
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this.dom.leftContainer.appendChild(this.dom.shadowBottomLeft);
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this.dom.rightContainer.appendChild(this.dom.shadowTopRight);
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this.dom.rightContainer.appendChild(this.dom.shadowBottomRight);
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this.on('rangechange', this.redraw.bind(this));
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this.on('change', this.redraw.bind(this));
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this.on('touch', this._onTouch.bind(this));
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this.on('pinch', this._onPinch.bind(this));
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this.on('dragstart', this._onDragStart.bind(this));
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this.on('drag', this._onDrag.bind(this));
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// create event listeners for all interesting events, these events will be
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// emitted via emitter
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this.hammer = Hammer(this.dom.root, {
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prevent_default: true
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});
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this.listeners = {};
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var me = this;
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var events = [
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'touch', 'pinch',
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'tap', 'doubletap', 'hold',
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'dragstart', 'drag', 'dragend',
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'mousewheel', 'DOMMouseScroll' // DOMMouseScroll is needed for Firefox
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];
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events.forEach(function (event) {
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var listener = function () {
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var args = [event].concat(Array.prototype.slice.call(arguments, 0));
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if (me.isActive()) {
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me.emit.apply(me, args);
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}
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};
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me.hammer.on(event, listener);
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me.listeners[event] = listener;
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});
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// size properties of each of the panels
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this.props = {
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root: {},
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background: {},
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centerContainer: {},
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leftContainer: {},
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rightContainer: {},
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center: {},
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left: {},
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right: {},
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top: {},
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bottom: {},
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border: {},
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scrollTop: 0,
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scrollTopMin: 0
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};
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this.touch = {}; // store state information needed for touch events
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// attach the root panel to the provided container
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if (!container) throw new Error('No container provided');
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container.appendChild(this.dom.root);
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};
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/**
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* Set options. Options will be passed to all components loaded in the Timeline.
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* @param {Object} [options]
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* {String} orientation
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* Vertical orientation for the Timeline,
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* can be 'bottom' (default) or 'top'.
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* {String | Number} width
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* Width for the timeline, a number in pixels or
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* a css string like '1000px' or '75%'. '100%' by default.
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* {String | Number} height
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* Fixed height for the Timeline, a number in pixels or
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* a css string like '400px' or '75%'. If undefined,
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* The Timeline will automatically size such that
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* its contents fit.
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* {String | Number} minHeight
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* Minimum height for the Timeline, a number in pixels or
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* a css string like '400px' or '75%'.
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* {String | Number} maxHeight
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* Maximum height for the Timeline, a number in pixels or
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* a css string like '400px' or '75%'.
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* {Number | Date | String} start
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* Start date for the visible window
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* {Number | Date | String} end
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* End date for the visible window
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*/
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Core.prototype.setOptions = function (options) {
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if (options) {
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// copy the known options
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var fields = ['width', 'height', 'minHeight', 'maxHeight', 'autoResize', 'start', 'end', 'orientation', 'clickToUse'];
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util.selectiveExtend(fields, this.options, options);
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if ('clickToUse' in options) {
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if (options.clickToUse) {
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this.activator = new Activator(this.dom.root);
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}
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else {
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if (this.activator) {
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this.activator.destroy();
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delete this.activator;
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}
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}
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}
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// enable/disable autoResize
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this._initAutoResize();
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}
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// propagate options to all components
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this.components.forEach(function (component) {
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component.setOptions(options);
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});
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// TODO: remove deprecation error one day (deprecated since version 0.8.0)
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if (options && options.order) {
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throw new Error('Option order is deprecated. There is no replacement for this feature.');
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}
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// redraw everything
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this.redraw();
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};
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/**
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* Returns true when the Timeline is active.
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* @returns {boolean}
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*/
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Core.prototype.isActive = function () {
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return !this.activator || this.activator.active;
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};
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/**
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* Destroy the Core, clean up all DOM elements and event listeners.
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*/
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Core.prototype.destroy = function () {
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// unbind datasets
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this.clear();
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// remove all event listeners
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this.off();
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// stop checking for changed size
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this._stopAutoResize();
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// remove from DOM
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if (this.dom.root.parentNode) {
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this.dom.root.parentNode.removeChild(this.dom.root);
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}
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this.dom = null;
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// remove Activator
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if (this.activator) {
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this.activator.destroy();
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delete this.activator;
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}
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// cleanup hammer touch events
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for (var event in this.listeners) {
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if (this.listeners.hasOwnProperty(event)) {
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delete this.listeners[event];
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}
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}
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this.listeners = null;
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this.hammer = null;
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// give all components the opportunity to cleanup
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this.components.forEach(function (component) {
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component.destroy();
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});
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this.body = null;
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};
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/**
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* Set a custom time bar
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* @param {Date} time
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*/
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Core.prototype.setCustomTime = function (time) {
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if (!this.customTime) {
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throw new Error('Cannot get custom time: Custom time bar is not enabled');
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}
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this.customTime.setCustomTime(time);
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};
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/**
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* Retrieve the current custom time.
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* @return {Date} customTime
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*/
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Core.prototype.getCustomTime = function() {
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if (!this.customTime) {
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throw new Error('Cannot get custom time: Custom time bar is not enabled');
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}
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return this.customTime.getCustomTime();
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};
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/**
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* Get the id's of the currently visible items.
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* @returns {Array} The ids of the visible items
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*/
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Core.prototype.getVisibleItems = function() {
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return this.itemSet && this.itemSet.getVisibleItems() || [];
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};
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/**
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* Clear the Core. By Default, items, groups and options are cleared.
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* Example usage:
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*
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* timeline.clear(); // clear items, groups, and options
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* timeline.clear({options: true}); // clear options only
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*
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* @param {Object} [what] Optionally specify what to clear. By default:
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* {items: true, groups: true, options: true}
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*/
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Core.prototype.clear = function(what) {
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// clear items
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if (!what || what.items) {
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this.setItems(null);
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}
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// clear groups
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if (!what || what.groups) {
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this.setGroups(null);
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}
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// clear options of timeline and of each of the components
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if (!what || what.options) {
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this.components.forEach(function (component) {
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component.setOptions(component.defaultOptions);
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});
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this.setOptions(this.defaultOptions); // this will also do a redraw
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}
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};
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/**
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* Set Core window such that it fits all items
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* @param {Object} [options] Available options:
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* `animate: boolean | number`
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* If true (default), the range is animated
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* smoothly to the new window.
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* If a number, the number is taken as duration
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* for the animation. Default duration is 500 ms.
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*/
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Core.prototype.fit = function(options) {
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// apply the data range as range
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var dataRange = this.getItemRange();
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// add 5% space on both sides
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var start = dataRange.min;
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var end = dataRange.max;
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if (start != null && end != null) {
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var interval = (end.valueOf() - start.valueOf());
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if (interval <= 0) {
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// prevent an empty interval
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interval = 24 * 60 * 60 * 1000; // 1 day
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}
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start = new Date(start.valueOf() - interval * 0.05);
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end = new Date(end.valueOf() + interval * 0.05);
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}
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// skip range set if there is no start and end date
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if (start === null && end === null) {
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return;
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}
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var animate = (options && options.animate !== undefined) ? options.animate : true;
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this.range.setRange(start, end, animate);
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};
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/**
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* Set the visible window. Both parameters are optional, you can change only
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* start or only end. Syntax:
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*
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* TimeLine.setWindow(start, end)
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* TimeLine.setWindow(range)
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*
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* Where start and end can be a Date, number, or string, and range is an
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* object with properties start and end.
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*
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* @param {Date | Number | String | Object} [start] Start date of visible window
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* @param {Date | Number | String} [end] End date of visible window
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* @param {Object} [options] Available options:
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* `animate: boolean | number`
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* If true (default), the range is animated
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* smoothly to the new window.
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* If a number, the number is taken as duration
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* for the animation. Default duration is 500 ms.
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*/
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Core.prototype.setWindow = function(start, end, options) {
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var animate = (options && options.animate !== undefined) ? options.animate : true;
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if (arguments.length == 1) {
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var range = arguments[0];
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this.range.setRange(range.start, range.end, animate);
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}
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else {
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this.range.setRange(start, end, animate);
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}
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};
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/**
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* Get the visible window
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* @return {{start: Date, end: Date}} Visible range
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*/
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Core.prototype.getWindow = function() {
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var range = this.range.getRange();
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return {
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start: new Date(range.start),
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end: new Date(range.end)
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};
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};
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/**
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* Force a redraw of the Core. Can be useful to manually redraw when
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* option autoResize=false
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*/
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Core.prototype.redraw = function() {
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var resized = false,
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options = this.options,
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props = this.props,
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dom = this.dom;
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if (!dom) return; // when destroyed
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// update class names
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if (options.orientation == 'top') {
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util.addClassName(dom.root, 'top');
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util.removeClassName(dom.root, 'bottom');
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}
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else {
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util.removeClassName(dom.root, 'top');
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util.addClassName(dom.root, 'bottom');
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}
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// update root width and height options
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dom.root.style.maxHeight = util.option.asSize(options.maxHeight, '');
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dom.root.style.minHeight = util.option.asSize(options.minHeight, '');
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dom.root.style.width = util.option.asSize(options.width, '');
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// calculate border widths
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props.border.left = (dom.centerContainer.offsetWidth - dom.centerContainer.clientWidth) / 2;
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props.border.right = props.border.left;
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props.border.top = (dom.centerContainer.offsetHeight - dom.centerContainer.clientHeight) / 2;
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props.border.bottom = props.border.top;
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var borderRootHeight= dom.root.offsetHeight - dom.root.clientHeight;
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var borderRootWidth = dom.root.offsetWidth - dom.root.clientWidth;
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// calculate the heights. If any of the side panels is empty, we set the height to
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// minus the border width, such that the border will be invisible
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props.center.height = dom.center.offsetHeight;
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props.left.height = dom.left.offsetHeight;
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props.right.height = dom.right.offsetHeight;
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props.top.height = dom.top.clientHeight || -props.border.top;
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props.bottom.height = dom.bottom.clientHeight || -props.border.bottom;
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// TODO: compensate borders when any of the panels is empty.
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// apply auto height
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// TODO: only calculate autoHeight when needed (else we cause an extra reflow/repaint of the DOM)
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var contentHeight = Math.max(props.left.height, props.center.height, props.right.height);
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var autoHeight = props.top.height + contentHeight + props.bottom.height +
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borderRootHeight + props.border.top + props.border.bottom;
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dom.root.style.height = util.option.asSize(options.height, autoHeight + 'px');
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// calculate heights of the content panels
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props.root.height = dom.root.offsetHeight;
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props.background.height = props.root.height - borderRootHeight;
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var containerHeight = props.root.height - props.top.height - props.bottom.height -
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borderRootHeight;
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props.centerContainer.height = containerHeight;
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props.leftContainer.height = containerHeight;
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props.rightContainer.height = props.leftContainer.height;
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// calculate the widths of the panels
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props.root.width = dom.root.offsetWidth;
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props.background.width = props.root.width - borderRootWidth;
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props.left.width = dom.leftContainer.clientWidth || -props.border.left;
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props.leftContainer.width = props.left.width;
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props.right.width = dom.rightContainer.clientWidth || -props.border.right;
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props.rightContainer.width = props.right.width;
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var centerWidth = props.root.width - props.left.width - props.right.width - borderRootWidth;
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props.center.width = centerWidth;
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props.centerContainer.width = centerWidth;
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props.top.width = centerWidth;
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props.bottom.width = centerWidth;
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// resize the panels
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dom.background.style.height = props.background.height + 'px';
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dom.backgroundVertical.style.height = props.background.height + 'px';
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dom.backgroundHorizontal.style.height = props.centerContainer.height + 'px';
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dom.centerContainer.style.height = props.centerContainer.height + 'px';
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dom.leftContainer.style.height = props.leftContainer.height + 'px';
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dom.rightContainer.style.height = props.rightContainer.height + 'px';
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dom.background.style.width = props.background.width + 'px';
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dom.backgroundVertical.style.width = props.centerContainer.width + 'px';
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dom.backgroundHorizontal.style.width = props.background.width + 'px';
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dom.centerContainer.style.width = props.center.width + 'px';
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dom.top.style.width = props.top.width + 'px';
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dom.bottom.style.width = props.bottom.width + 'px';
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// reposition the panels
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dom.background.style.left = '0';
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dom.background.style.top = '0';
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dom.backgroundVertical.style.left = props.left.width + 'px';
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dom.backgroundVertical.style.top = '0';
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dom.backgroundHorizontal.style.left = '0';
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dom.backgroundHorizontal.style.top = props.top.height + 'px';
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dom.centerContainer.style.left = props.left.width + 'px';
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dom.centerContainer.style.top = props.top.height + 'px';
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dom.leftContainer.style.left = '0';
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|
dom.leftContainer.style.top = props.top.height + 'px';
|
|
dom.rightContainer.style.left = (props.left.width + props.center.width) + 'px';
|
|
dom.rightContainer.style.top = props.top.height + 'px';
|
|
dom.top.style.left = props.left.width + 'px';
|
|
dom.top.style.top = '0';
|
|
dom.bottom.style.left = props.left.width + 'px';
|
|
dom.bottom.style.top = (props.top.height + props.centerContainer.height) + 'px';
|
|
|
|
// update the scrollTop, feasible range for the offset can be changed
|
|
// when the height of the Core or of the contents of the center changed
|
|
this._updateScrollTop();
|
|
|
|
// reposition the scrollable contents
|
|
var offset = this.props.scrollTop;
|
|
if (options.orientation == 'bottom') {
|
|
offset += Math.max(this.props.centerContainer.height - this.props.center.height -
|
|
this.props.border.top - this.props.border.bottom, 0);
|
|
}
|
|
dom.center.style.left = '0';
|
|
dom.center.style.top = offset + 'px';
|
|
dom.left.style.left = '0';
|
|
dom.left.style.top = offset + 'px';
|
|
dom.right.style.left = '0';
|
|
dom.right.style.top = offset + 'px';
|
|
|
|
// show shadows when vertical scrolling is available
|
|
var visibilityTop = this.props.scrollTop == 0 ? 'hidden' : '';
|
|
var visibilityBottom = this.props.scrollTop == this.props.scrollTopMin ? 'hidden' : '';
|
|
dom.shadowTop.style.visibility = visibilityTop;
|
|
dom.shadowBottom.style.visibility = visibilityBottom;
|
|
dom.shadowTopLeft.style.visibility = visibilityTop;
|
|
dom.shadowBottomLeft.style.visibility = visibilityBottom;
|
|
dom.shadowTopRight.style.visibility = visibilityTop;
|
|
dom.shadowBottomRight.style.visibility = visibilityBottom;
|
|
|
|
// redraw all components
|
|
this.components.forEach(function (component) {
|
|
resized = component.redraw() || resized;
|
|
});
|
|
if (resized) {
|
|
// keep repainting until all sizes are settled
|
|
this.redraw();
|
|
}
|
|
};
|
|
|
|
// TODO: deprecated since version 1.1.0, remove some day
|
|
Core.prototype.repaint = function () {
|
|
throw new Error('Function repaint is deprecated. Use redraw instead.');
|
|
};
|
|
|
|
/**
|
|
* Set a current time. This can be used for example to ensure that a client's
|
|
* time is synchronized with a shared server time.
|
|
* Only applicable when option `showCurrentTime` is true.
|
|
* @param {Date | String | Number} time A Date, unix timestamp, or
|
|
* ISO date string.
|
|
*/
|
|
Core.prototype.setCurrentTime = function(time) {
|
|
if (!this.currentTime) {
|
|
throw new Error('Option showCurrentTime must be true');
|
|
}
|
|
|
|
this.currentTime.setCurrentTime(time);
|
|
};
|
|
|
|
/**
|
|
* Get the current time.
|
|
* Only applicable when option `showCurrentTime` is true.
|
|
* @return {Date} Returns the current time.
|
|
*/
|
|
Core.prototype.getCurrentTime = function() {
|
|
if (!this.currentTime) {
|
|
throw new Error('Option showCurrentTime must be true');
|
|
}
|
|
|
|
return this.currentTime.getCurrentTime();
|
|
};
|
|
|
|
/**
|
|
* Convert a position on screen (pixels) to a datetime
|
|
* @param {int} x Position on the screen in pixels
|
|
* @return {Date} time The datetime the corresponds with given position x
|
|
* @private
|
|
*/
|
|
// TODO: move this function to Range
|
|
Core.prototype._toTime = function(x) {
|
|
var conversion = this.range.conversion(this.props.center.width);
|
|
return new Date(x / conversion.scale + conversion.offset);
|
|
};
|
|
|
|
|
|
/**
|
|
* Convert a position on the global screen (pixels) to a datetime
|
|
* @param {int} x Position on the screen in pixels
|
|
* @return {Date} time The datetime the corresponds with given position x
|
|
* @private
|
|
*/
|
|
// TODO: move this function to Range
|
|
Core.prototype._toGlobalTime = function(x) {
|
|
var conversion = this.range.conversion(this.props.root.width);
|
|
return new Date(x / conversion.scale + conversion.offset);
|
|
};
|
|
|
|
/**
|
|
* Convert a datetime (Date object) into a position on the screen
|
|
* @param {Date} time A date
|
|
* @return {int} x The position on the screen in pixels which corresponds
|
|
* with the given date.
|
|
* @private
|
|
*/
|
|
// TODO: move this function to Range
|
|
Core.prototype._toScreen = function(time) {
|
|
var conversion = this.range.conversion(this.props.center.width);
|
|
return (time.valueOf() - conversion.offset) * conversion.scale;
|
|
};
|
|
|
|
|
|
/**
|
|
* Convert a datetime (Date object) into a position on the root
|
|
* This is used to get the pixel density estimate for the screen, not the center panel
|
|
* @param {Date} time A date
|
|
* @return {int} x The position on root in pixels which corresponds
|
|
* with the given date.
|
|
* @private
|
|
*/
|
|
// TODO: move this function to Range
|
|
Core.prototype._toGlobalScreen = function(time) {
|
|
var conversion = this.range.conversion(this.props.root.width);
|
|
return (time.valueOf() - conversion.offset) * conversion.scale;
|
|
};
|
|
|
|
|
|
/**
|
|
* Initialize watching when option autoResize is true
|
|
* @private
|
|
*/
|
|
Core.prototype._initAutoResize = function () {
|
|
if (this.options.autoResize == true) {
|
|
this._startAutoResize();
|
|
}
|
|
else {
|
|
this._stopAutoResize();
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Watch for changes in the size of the container. On resize, the Panel will
|
|
* automatically redraw itself.
|
|
* @private
|
|
*/
|
|
Core.prototype._startAutoResize = function () {
|
|
var me = this;
|
|
|
|
this._stopAutoResize();
|
|
|
|
this._onResize = function() {
|
|
if (me.options.autoResize != true) {
|
|
// stop watching when the option autoResize is changed to false
|
|
me._stopAutoResize();
|
|
return;
|
|
}
|
|
|
|
if (me.dom.root) {
|
|
// check whether the frame is resized
|
|
if ((me.dom.root.clientWidth != me.props.lastWidth) ||
|
|
(me.dom.root.clientHeight != me.props.lastHeight)) {
|
|
me.props.lastWidth = me.dom.root.clientWidth;
|
|
me.props.lastHeight = me.dom.root.clientHeight;
|
|
|
|
me.emit('change');
|
|
}
|
|
}
|
|
};
|
|
|
|
// add event listener to window resize
|
|
util.addEventListener(window, 'resize', this._onResize);
|
|
|
|
this.watchTimer = setInterval(this._onResize, 1000);
|
|
};
|
|
|
|
/**
|
|
* Stop watching for a resize of the frame.
|
|
* @private
|
|
*/
|
|
Core.prototype._stopAutoResize = function () {
|
|
if (this.watchTimer) {
|
|
clearInterval(this.watchTimer);
|
|
this.watchTimer = undefined;
|
|
}
|
|
|
|
// remove event listener on window.resize
|
|
util.removeEventListener(window, 'resize', this._onResize);
|
|
this._onResize = null;
|
|
};
|
|
|
|
/**
|
|
* Start moving the timeline vertically
|
|
* @param {Event} event
|
|
* @private
|
|
*/
|
|
Core.prototype._onTouch = function (event) {
|
|
this.touch.allowDragging = true;
|
|
};
|
|
|
|
/**
|
|
* Start moving the timeline vertically
|
|
* @param {Event} event
|
|
* @private
|
|
*/
|
|
Core.prototype._onPinch = function (event) {
|
|
this.touch.allowDragging = false;
|
|
};
|
|
|
|
/**
|
|
* Start moving the timeline vertically
|
|
* @param {Event} event
|
|
* @private
|
|
*/
|
|
Core.prototype._onDragStart = function (event) {
|
|
this.touch.initialScrollTop = this.props.scrollTop;
|
|
};
|
|
|
|
/**
|
|
* Move the timeline vertically
|
|
* @param {Event} event
|
|
* @private
|
|
*/
|
|
Core.prototype._onDrag = function (event) {
|
|
// refuse to drag when we where pinching to prevent the timeline make a jump
|
|
// when releasing the fingers in opposite order from the touch screen
|
|
if (!this.touch.allowDragging) return;
|
|
|
|
var delta = event.gesture.deltaY;
|
|
|
|
var oldScrollTop = this._getScrollTop();
|
|
var newScrollTop = this._setScrollTop(this.touch.initialScrollTop + delta);
|
|
|
|
if (newScrollTop != oldScrollTop) {
|
|
this.redraw(); // TODO: this causes two redraws when dragging, the other is triggered by rangechange already
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Apply a scrollTop
|
|
* @param {Number} scrollTop
|
|
* @returns {Number} scrollTop Returns the applied scrollTop
|
|
* @private
|
|
*/
|
|
Core.prototype._setScrollTop = function (scrollTop) {
|
|
this.props.scrollTop = scrollTop;
|
|
this._updateScrollTop();
|
|
return this.props.scrollTop;
|
|
};
|
|
|
|
/**
|
|
* Update the current scrollTop when the height of the containers has been changed
|
|
* @returns {Number} scrollTop Returns the applied scrollTop
|
|
* @private
|
|
*/
|
|
Core.prototype._updateScrollTop = function () {
|
|
// recalculate the scrollTopMin
|
|
var scrollTopMin = Math.min(this.props.centerContainer.height - this.props.center.height, 0); // is negative or zero
|
|
if (scrollTopMin != this.props.scrollTopMin) {
|
|
// in case of bottom orientation, change the scrollTop such that the contents
|
|
// do not move relative to the time axis at the bottom
|
|
if (this.options.orientation == 'bottom') {
|
|
this.props.scrollTop += (scrollTopMin - this.props.scrollTopMin);
|
|
}
|
|
this.props.scrollTopMin = scrollTopMin;
|
|
}
|
|
|
|
// limit the scrollTop to the feasible scroll range
|
|
if (this.props.scrollTop > 0) this.props.scrollTop = 0;
|
|
if (this.props.scrollTop < scrollTopMin) this.props.scrollTop = scrollTopMin;
|
|
|
|
return this.props.scrollTop;
|
|
};
|
|
|
|
/**
|
|
* Get the current scrollTop
|
|
* @returns {number} scrollTop
|
|
* @private
|
|
*/
|
|
Core.prototype._getScrollTop = function () {
|
|
return this.props.scrollTop;
|
|
};
|
|
|
|
module.exports = Core;
|