vis.js is a dynamic, browser-based visualization library
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var Item = require('./Item');
/**
* @constructor PointItem
* @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 PointItem (data, conversion, options) {
this.props = {
dot: {
top: 0,
width: 0,
height: 0
},
content: {
height: 0,
marginLeft: 0,
marginRight: 0
}
};
this.options = options;
// validate data
if (data) {
if (data.start == undefined) {
throw new Error('Property "start" missing in item ' + data);
}
}
Item.call(this, data, conversion, options);
}
PointItem.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
*/
PointItem.prototype.isVisible = function(range) {
// determine visibility
var msPerPixel = (range.end - range.start) / range.body.dom.center.clientWidth;
var widthInMs = this.width * msPerPixel;
return (this.data.start.getTime() + widthInMs > range.start ) && (this.data.start < range.end);
};
/**
* Repaint the item
*/
PointItem.prototype.redraw = function() {
var dom = this.dom;
if (!dom) {
// create DOM
this.dom = {};
dom = this.dom;
// background box
dom.point = document.createElement('div');
// className is updated in redraw()
// contents box, right from the dot
dom.content = document.createElement('div');
dom.content.className = 'vis-item-content';
dom.point.appendChild(dom.content);
// dot at start
dom.dot = document.createElement('div');
dom.point.appendChild(dom.dot);
// attach this item as attribute
dom.point['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.point.parentNode) {
var foreground = this.parent.dom.foreground;
if (!foreground) {
throw new Error('Cannot redraw item: parent has no foreground container element');
}
foreground.appendChild(dom.point);
}
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._updateDataAttributes(this.dom.point);
this._updateStyle(this.dom.point);
var editable = (this.options.editable.updateTime ||
this.options.editable.updateGroup ||
this.editable === true) &&
this.editable !== false;
// update class
var className = (this.data.className ? ' ' + this.data.className : '') +
(this.selected ? ' vis-selected' : '') +
(editable ? ' vis-editable' : ' vis-readonly');
dom.point.className = 'vis-item vis-point' + className;
dom.dot.className = 'vis-item vis-dot' + className;
// recalculate size of dot and contents
this.props.dot.width = dom.dot.offsetWidth;
this.props.dot.height = dom.dot.offsetHeight;
this.props.content.height = dom.content.offsetHeight;
// resize contents
if (this.options.rtl) {
dom.content.style.marginRight = 2 * this.props.dot.width + 'px';
} else {
dom.content.style.marginLeft = 2 * this.props.dot.width + 'px';
}
//dom.content.style.marginRight = ... + 'px'; // TODO: margin right
// recalculate size
this.width = dom.point.offsetWidth;
this.height = dom.point.offsetHeight;
// reposition the dot
dom.dot.style.top = ((this.height - this.props.dot.height) / 2) + 'px';
if (this.options.rtl) {
dom.dot.style.right = (this.props.dot.width / 2) + 'px';
} else {
dom.dot.style.left = (this.props.dot.width / 2) + 'px';
}
this.dirty = false;
}
this._repaintOnItemUpdateTimeTooltip(dom.point);
this._repaintDragCenter();
this._repaintDeleteButton(dom.point);
};
/**
* Show the item in the DOM (when not already visible). The items DOM will
* be created when needed.
*/
PointItem.prototype.show = function() {
if (!this.displayed) {
this.redraw();
}
};
/**
* Hide the item from the DOM (when visible)
*/
PointItem.prototype.hide = function() {
if (this.displayed) {
if (this.dom.point.parentNode) {
this.dom.point.parentNode.removeChild(this.dom.point);
}
this.displayed = false;
}
};
/**
* Reposition the item horizontally
* @Override
*/
PointItem.prototype.repositionX = function() {
var start = this.conversion.toScreen(this.data.start);
if (this.options.rtl) {
this.right = start - this.props.dot.width;
// reposition point
this.dom.point.style.right = this.right + 'px';
} else {
this.left = start - this.props.dot.width;
// reposition point
this.dom.point.style.left = this.left + 'px';
}
};
/**
* Reposition the item vertically
* @Override
*/
PointItem.prototype.repositionY = function() {
var orientation = this.options.orientation.item;
var point = this.dom.point;
if (orientation == 'top') {
point.style.top = this.top + 'px';
}
else {
point.style.top = (this.parent.height - this.top - this.height) + 'px';
}
};
/**
* Return the width of the item left from its start date
* @return {number}
*/
PointItem.prototype.getWidthLeft = function () {
return this.props.dot.width;
};
/**
* Return the width of the item right from its start date
* @return {number}
*/
PointItem.prototype.getWidthRight = function () {
return this.props.dot.width;
};
module.exports = PointItem;