vis.js is a dynamic, browser-based visualization library
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var Item = require('./Item');
var util = require('../../../util');
/**
* @constructor BoxItem
* @extends Item
* @param {Object} data Object containing parameters start
* content, className.
* @param {{toScreen: function, toTime: function}} conversion
* Conversion functions from time to screen and vice versa
* @param {Object} [options] Configuration options
* // TODO: describe available options
*/
function BoxItem (data, conversion, options) {
this.props = {
dot: {
width: 0,
height: 0
},
line: {
width: 0,
height: 0
}
};
// validate data
if (data) {
if (data.start == undefined) {
throw new Error('Property "start" missing in item ' + data);
}
}
Item.call(this, data, conversion, options);
}
BoxItem.prototype = new Item (null, null, null);
/**
* Check whether this item is visible inside given range
* @returns {{start: Number, end: Number}} range with a timestamp for start and end
* @returns {boolean} True if visible
*/
BoxItem.prototype.isVisible = function(range) {
// determine visibility
// TODO: account for the real width of the item. Right now we just add 1/4 to the window
var interval = (range.end - range.start) / 4;
return (this.data.start > range.start - interval) && (this.data.start < range.end + interval);
};
/**
* Repaint the item
*/
BoxItem.prototype.redraw = function() {
var dom = this.dom;
if (!dom) {
// create DOM
this.dom = {};
dom = this.dom;
// create main box
dom.box = document.createElement('DIV');
// contents box (inside the background box). used for making margins
dom.content = document.createElement('DIV');
dom.content.className = 'vis-item-content';
dom.box.appendChild(dom.content);
// line to axis
dom.line = document.createElement('DIV');
dom.line.className = 'vis-line';
// dot on axis
dom.dot = document.createElement('DIV');
dom.dot.className = 'vis-dot';
// attach this item as attribute
dom.box['timeline-item'] = this;
this.dirty = true;
}
// append DOM to parent DOM
if (!this.parent) {
throw new Error('Cannot redraw item: no parent attached');
}
if (!dom.box.parentNode) {
var foreground = this.parent.dom.foreground;
if (!foreground) throw new Error('Cannot redraw item: parent has no foreground container element');
foreground.appendChild(dom.box);
}
if (!dom.line.parentNode) {
var background = this.parent.dom.background;
if (!background) throw new Error('Cannot redraw item: parent has no background container element');
background.appendChild(dom.line);
}
if (!dom.dot.parentNode) {
var axis = this.parent.dom.axis;
if (!background) throw new Error('Cannot redraw item: parent has no axis container element');
axis.appendChild(dom.dot);
}
this.displayed = true;
// Update DOM when item is marked dirty. An item is marked dirty when:
// - the item is not yet rendered
// - the item's data is changed
// - the item is selected/deselected
if (this.dirty) {
this._updateContents(this.dom.content);
this._updateTitle(this.dom.box);
this._updateDataAttributes(this.dom.box);
this._updateStyle(this.dom.box);
// update class
var className = (this.data.className? ' ' + this.data.className : '') +
(this.selected ? ' vis-selected' : '');
dom.box.className = 'vis-item vis-box' + className;
dom.line.className = 'vis-item vis-line' + className;
dom.dot.className = 'vis-item vis-dot' + className;
// recalculate size
this.props.dot.height = dom.dot.offsetHeight;
this.props.dot.width = dom.dot.offsetWidth;
this.props.line.width = dom.line.offsetWidth;
this.width = dom.box.offsetWidth;
this.height = dom.box.offsetHeight;
this.dirty = false;
}
this._repaintDeleteButton(dom.box);
};
/**
* Show the item in the DOM (when not already displayed). The items DOM will
* be created when needed.
*/
BoxItem.prototype.show = function() {
if (!this.displayed) {
this.redraw();
}
};
/**
* Hide the item from the DOM (when visible)
*/
BoxItem.prototype.hide = function() {
if (this.displayed) {
var dom = this.dom;
if (dom.box.parentNode) dom.box.parentNode.removeChild(dom.box);
if (dom.line.parentNode) dom.line.parentNode.removeChild(dom.line);
if (dom.dot.parentNode) dom.dot.parentNode.removeChild(dom.dot);
this.displayed = false;
}
};
/**
* Reposition the item horizontally
* @Override
*/
BoxItem.prototype.repositionX = function() {
var start = this.conversion.toScreen(this.data.start);
var align = this.options.align;
var left;
// calculate left position of the box
if (align == 'right') {
this.left = start - this.width;
}
else if (align == 'left') {
this.left = start;
}
else {
// default or 'center'
this.left = start - this.width / 2;
}
// reposition box
this.dom.box.style.left = this.left + 'px';
// reposition line
this.dom.line.style.left = (start - this.props.line.width / 2) + 'px';
// reposition dot
this.dom.dot.style.left = (start - this.props.dot.width / 2) + 'px';
};
/**
* Reposition the item vertically
* @Override
*/
BoxItem.prototype.repositionY = function() {
var orientation = this.options.orientation.item;
var box = this.dom.box;
var line = this.dom.line;
var dot = this.dom.dot;
if (orientation == 'top') {
box.style.top = (this.top || 0) + 'px';
line.style.top = '0';
line.style.height = (this.parent.top + this.top + 1) + 'px';
line.style.bottom = '';
}
else { // orientation 'bottom'
var itemSetHeight = this.parent.itemSet.props.height; // TODO: this is nasty
var lineHeight = itemSetHeight - this.parent.top - this.parent.height + this.top;
box.style.top = (this.parent.height - this.top - this.height || 0) + 'px';
line.style.top = (itemSetHeight - lineHeight) + 'px';
line.style.bottom = '0';
}
dot.style.top = (-this.props.dot.height / 2) + 'px';
};
/**
* Return the width of the item left from its start date
* @return {number}
*/
BoxItem.prototype.getWidthLeft = function () {
return this.width / 2;
};
/**
* Return the width of the item right from its start date
* @return {number}
*/
BoxItem.prototype.getWidthRight = function () {
return this.width / 2;
};
module.exports = BoxItem;