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295 lines
8.5 KiB
295 lines
8.5 KiB
var Hammer = require('../../../module/hammer');
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var Item = require('./Item');
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/**
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* @constructor RangeItem
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* @extends Item
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* @param {Object} data Object containing parameters start, end
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* content, className.
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* @param {{toScreen: function, toTime: function}} conversion
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* Conversion functions from time to screen and vice versa
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* @param {Object} [options] Configuration options
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* // TODO: describe options
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*/
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function RangeItem (data, conversion, options) {
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this.props = {
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content: {
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width: 0
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}
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};
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this.overflow = false; // if contents can overflow (css styling), this flag is set to true
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// validate data
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if (data) {
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if (data.start == undefined) {
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throw new Error('Property "start" missing in item ' + data.id);
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}
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if (data.end == undefined) {
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throw new Error('Property "end" missing in item ' + data.id);
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}
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}
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Item.call(this, data, conversion, options);
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}
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RangeItem.prototype = new Item (null, null, null);
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RangeItem.prototype.baseClassName = 'vis-item vis-range';
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/**
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* Check whether this item is visible inside given range
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* @returns {{start: Number, end: Number}} range with a timestamp for start and end
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* @returns {boolean} True if visible
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*/
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RangeItem.prototype.isVisible = function(range) {
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// determine visibility
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return (this.data.start < range.end) && (this.data.end > range.start);
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};
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/**
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* Repaint the item
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*/
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RangeItem.prototype.redraw = function() {
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var dom = this.dom;
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if (!dom) {
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// create DOM
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this.dom = {};
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dom = this.dom;
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// background box
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dom.box = document.createElement('div');
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// className is updated in redraw()
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// frame box (to prevent the item contents from overflowing
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dom.frame = document.createElement('div');
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dom.frame.className = 'vis-item-frame';
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dom.box.appendChild(dom.frame);
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// contents box
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dom.content = document.createElement('div');
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dom.content.className = 'vis-item-content';
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dom.frame.appendChild(dom.content);
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// attach this item as attribute
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dom.box['timeline-item'] = this;
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this.dirty = true;
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}
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// append DOM to parent DOM
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if (!this.parent) {
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throw new Error('Cannot redraw item: no parent attached');
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}
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if (!dom.box.parentNode) {
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var foreground = this.parent.dom.foreground;
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if (!foreground) {
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throw new Error('Cannot redraw item: parent has no foreground container element');
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}
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foreground.appendChild(dom.box);
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}
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this.displayed = true;
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// Update DOM when item is marked dirty. An item is marked dirty when:
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// - the item is not yet rendered
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// - the item's data is changed
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// - the item is selected/deselected
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if (this.dirty) {
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this._updateContents(this.dom.content);
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this._updateTitle(this.dom.box);
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this._updateDataAttributes(this.dom.box);
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this._updateStyle(this.dom.box);
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// update class
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var className = (this.data.className ? (' ' + this.data.className) : '') +
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(this.selected ? ' vis-selected' : '');
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dom.box.className = this.baseClassName + className;
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// determine from css whether this box has overflow
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this.overflow = window.getComputedStyle(dom.frame).overflow !== 'hidden';
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// recalculate size
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// turn off max-width to be able to calculate the real width
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// this causes an extra browser repaint/reflow, but so be it
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this.dom.content.style.maxWidth = 'none';
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this.props.content.width = this.dom.content.offsetWidth;
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this.height = this.dom.box.offsetHeight;
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this.dom.content.style.maxWidth = '';
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this.dirty = false;
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}
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this._repaintDeleteButton(dom.box);
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this._repaintDragLeft();
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this._repaintDragRight();
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};
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/**
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* Show the item in the DOM (when not already visible). The items DOM will
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* be created when needed.
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*/
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RangeItem.prototype.show = function() {
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if (!this.displayed) {
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this.redraw();
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}
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};
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/**
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* Hide the item from the DOM (when visible)
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* @return {Boolean} changed
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*/
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RangeItem.prototype.hide = function() {
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if (this.displayed) {
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var box = this.dom.box;
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if (box.parentNode) {
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box.parentNode.removeChild(box);
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}
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this.displayed = false;
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}
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};
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/**
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* Reposition the item horizontally
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* @param {boolean} [limitSize=true] If true (default), the width of the range
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* item will be limited, as the browser cannot
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* display very wide divs. This means though
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* that the applied left and width may
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* not correspond to the ranges start and end
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* @Override
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*/
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RangeItem.prototype.repositionX = function(limitSize) {
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var parentWidth = this.parent.width;
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var start = this.conversion.toScreen(this.data.start);
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var end = this.conversion.toScreen(this.data.end);
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var contentLeft;
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var contentWidth;
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// limit the width of the range, as browsers cannot draw very wide divs
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if (limitSize === undefined || limitSize === true) {
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if (start < -parentWidth) {
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start = -parentWidth;
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}
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if (end > 2 * parentWidth) {
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end = 2 * parentWidth;
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}
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}
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var boxWidth = Math.max(end - start, 1);
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if (this.overflow) {
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this.left = start;
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this.width = boxWidth + this.props.content.width;
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contentWidth = this.props.content.width;
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// Note: The calculation of width is an optimistic calculation, giving
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// a width which will not change when moving the Timeline
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// So no re-stacking needed, which is nicer for the eye;
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}
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else {
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this.left = start;
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this.width = boxWidth;
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contentWidth = Math.min(end - start - 2 * this.options.padding, this.props.content.width);
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// TODO: remove the need for options.padding. it's terrible.
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}
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this.dom.box.style.left = this.left + 'px';
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this.dom.box.style.width = boxWidth + 'px';
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switch (this.options.align) {
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case 'left':
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this.dom.content.style.left = '0';
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break;
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case 'right':
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this.dom.content.style.left = Math.max((boxWidth - contentWidth - 2 * this.options.padding), 0) + 'px';
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break;
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case 'center':
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this.dom.content.style.left = Math.max((boxWidth - contentWidth - 2 * this.options.padding) / 2, 0) + 'px';
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break;
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default: // 'auto'
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// when range exceeds left of the window, position the contents at the left of the visible area
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if (this.overflow) {
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if (end > 0) {
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contentLeft = Math.max(-start, 0);
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}
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else {
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contentLeft = -contentWidth; // ensure it's not visible anymore
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}
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}
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else {
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if (start < 0) {
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contentLeft = -start;
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}
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else {
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contentLeft = 0;
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}
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}
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this.dom.content.style.left = contentLeft + 'px';
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}
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};
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/**
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* Reposition the item vertically
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* @Override
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*/
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RangeItem.prototype.repositionY = function() {
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var orientation = this.options.orientation,
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box = this.dom.box;
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if (orientation == 'top') {
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box.style.top = this.top + 'px';
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}
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else {
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box.style.top = (this.parent.height - this.top - this.height) + 'px';
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}
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};
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/**
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* Repaint a drag area on the left side of the range when the range is selected
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* @protected
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*/
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RangeItem.prototype._repaintDragLeft = function () {
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if (this.selected && this.options.editable.updateTime && !this.dom.dragLeft) {
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// create and show drag area
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var dragLeft = document.createElement('div');
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dragLeft.className = 'vis-drag-left';
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dragLeft.dragLeftItem = this;
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this.dom.box.appendChild(dragLeft);
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this.dom.dragLeft = dragLeft;
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}
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else if (!this.selected && this.dom.dragLeft) {
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// delete drag area
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if (this.dom.dragLeft.parentNode) {
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this.dom.dragLeft.parentNode.removeChild(this.dom.dragLeft);
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}
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this.dom.dragLeft = null;
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}
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};
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/**
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* Repaint a drag area on the right side of the range when the range is selected
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* @protected
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*/
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RangeItem.prototype._repaintDragRight = function () {
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if (this.selected && this.options.editable.updateTime && !this.dom.dragRight) {
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// create and show drag area
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var dragRight = document.createElement('div');
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dragRight.className = 'vis-drag-right';
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dragRight.dragRightItem = this;
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this.dom.box.appendChild(dragRight);
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this.dom.dragRight = dragRight;
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}
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else if (!this.selected && this.dom.dragRight) {
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// delete drag area
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if (this.dom.dragRight.parentNode) {
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this.dom.dragRight.parentNode.removeChild(this.dom.dragRight);
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}
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this.dom.dragRight = null;
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}
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};
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module.exports = RangeItem;
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