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<title>Code coverage report for src/scroll/inifinity.js</title>
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<h1>
<a href="../../index.html">all files</a> / <a href="index.html">src/scroll/</a> inifinity.js
</h1>
<div class='clearfix'>
<div class='fl pad1y space-right2'>
<span class="strong">9.13% </span>
<span class="quiet">Statements</span>
<span class='fraction'>23/252</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">0% </span>
<span class="quiet">Branches</span>
<span class='fraction'>0/86</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">3.33% </span>
<span class="quiet">Functions</span>
<span class='fraction'>1/30</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">9.13% </span>
<span class="quiet">Lines</span>
<span class='fraction'>23/252</span>
</div>
</div>
</div>
<div class='status-line low'></div>
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414</td><td class="line-coverage quiet"><span class="cline-any cline-neutral"> </span>
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<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-yes">1×</span>
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<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-yes">1×</span>
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<span class="cline-any cline-yes">1×</span>
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<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-yes">1×</span>
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<span class="cline-any cline-yes">1×</span>
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<span class="cline-any cline-yes">1×</span>
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<span class="cline-any cline-yes">1×</span>
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<span class="cline-any cline-yes">1×</span>
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<span class="cline-any cline-neutral"> </span>
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<span class="cline-any cline-yes">1×</span>
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<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-yes">1×</span>
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<span class="cline-any cline-yes">1×</span>
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<span class="cline-any cline-yes">1×</span>
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<span class="cline-any cline-no"> </span>
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<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-yes">1×</span>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">import {
style,
cssVendor
} from '../util/dom'
import { assert } from '../util/debug'
// import { ease } from '../util/ease'
// Number of items to instantiate beyond current view in the scroll direction.
const RUNWAY_ITEMS = 30
// Number of items to instantiate beyond current view in the opposite direction.
const RUNWAY_ITEMS_OPPOSITE = 10
// The animation interval (in ms) for fading in content from tombstones.
const ANIMATION_DURATION_MS = 200
// The number of pixels of default additional length to allow scrolling to.
const DEFAULT_SCROLL_RUNWAY = 2000
export function infiniteMixin(BScroll) {
BScroll.prototype._initInfinite = function () <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" > this.options.probeType = 3</span>
<span class="cstat-no" title="statement not covered" > this.maxScrollY = -DEFAULT_SCROLL_RUNWAY</span>
<span class="cstat-no" title="statement not covered" > this.infiniteScroller = new InfiniteScroller(this, this.options.infinity)</span>
}
}
function isTombstoneNode(node) <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" > if (node && node.classList) {</span>
<span class="cstat-no" title="statement not covered" > return node.classList.contains('tombstone')</span>
}
}
function InfiniteScroller(scroller, options) <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" > this.options = options</span>
<span class="cstat-no" title="statement not covered" > assert(typeof this.options.createTombstone === 'function', 'Infinite scroll need createTombstone Function to create tombstone')</span>
<span class="cstat-no" title="statement not covered" > assert(typeof this.options.fetch === 'function', 'Infinite scroll need fetch Function to fetch new data.')</span>
<span class="cstat-no" title="statement not covered" > assert(typeof this.options.render === 'function', 'Infinite scroll need render Function to render each item.')</span>
<span class="cstat-no" title="statement not covered" > this.firstAttachedItem = 0</span>
<span class="cstat-no" title="statement not covered" > this.lastAttachedItem = 0</span>
<span class="cstat-no" title="statement not covered" > this.anchorScrollTop = 0</span>
<span class="cstat-no" title="statement not covered" > this.anchorItem = {</span>
index: 0,
offset: 0
}
<span class="cstat-no" title="statement not covered" > this.tombstoneHeight = 0</span>
<span class="cstat-no" title="statement not covered" > this.tombstoneWidth = 0</span>
<span class="cstat-no" title="statement not covered" > this.tombstones = []</span>
<span class="cstat-no" title="statement not covered" > this.tombstonesAnimationHandlers = []</span>
<span class="cstat-no" title="statement not covered" > this.items = []</span>
<span class="cstat-no" title="statement not covered" > this.loadedItems = 0</span>
<span class="cstat-no" title="statement not covered" > this.requestInProgress = false</span>
<span class="cstat-no" title="statement not covered" > this.hasMore = true</span>
<span class="cstat-no" title="statement not covered" > this.scroller = scroller</span>
<span class="cstat-no" title="statement not covered" > this.wrapperEl = this.scroller.wrapper</span>
<span class="cstat-no" title="statement not covered" > this.scrollerEl = this.scroller.scroller</span>
<span class="cstat-no" title="statement not covered" > this.scroller.on('scroll', () => <span class="fstat-no" title="function not covered" >{</span></span>
<span class="cstat-no" title="statement not covered" > this.onScroll()</span>
})
<span class="cstat-no" title="statement not covered" > this.scroller.on('resize', () => <span class="fstat-no" title="function not covered" >{</span></span>
<span class="cstat-no" title="statement not covered" > this.onResize()</span>
})
<span class="cstat-no" title="statement not covered" > this.scroller.on('destroy', () => <span class="fstat-no" title="function not covered" >{</span></span>
<span class="cstat-no" title="statement not covered" > this.destroy()</span>
})
// wait scroll core init
<span class="cstat-no" title="statement not covered" > this._onResizeHandler = setTimeout(() => <span class="fstat-no" title="function not covered" >{</span></span>
<span class="cstat-no" title="statement not covered" > this.onResize()</span>
})
}
InfiniteScroller.prototype.destroy = function () <span class="fstat-no" title="function not covered" >{</span>
// In extreme scene, destroy is triggered before _onResizeHandler
<span class="cstat-no" title="statement not covered" > clearTimeout(this._onResizeHandler)</span>
<span class="cstat-no" title="statement not covered" > this.tombstonesAnimationHandlers.forEach(function (handler) <span class="fstat-no" title="function not covered" >{</span></span>
<span class="cstat-no" title="statement not covered" > clearTimeout(handler)</span>
})
<span class="cstat-no" title="statement not covered" > this.tombstonesAnimationHandlers = null</span>
<span class="cstat-no" title="statement not covered" > this.items.forEach((item) => <span class="fstat-no" title="function not covered" >{</span></span>
<span class="cstat-no" title="statement not covered" > if (item.node) {</span>
<span class="cstat-no" title="statement not covered" > this.scrollerEl.removeChild(item.node)</span>
<span class="cstat-no" title="statement not covered" > item.node = null</span>
}
})
<span class="cstat-no" title="statement not covered" > this.scroller.infiniteScroller = null</span>
<span class="cstat-no" title="statement not covered" > this.scroller = null</span>
<span class="cstat-no" title="statement not covered" > this.wrapperEl = null</span>
<span class="cstat-no" title="statement not covered" > this.scrollerEl = null</span>
<span class="cstat-no" title="statement not covered" > this.items = null</span>
<span class="cstat-no" title="statement not covered" > this.tombstones = null</span>
}
InfiniteScroller.prototype.onScroll = function () <span class="fstat-no" title="function not covered" >{</span>
const scrollTop = <span class="cstat-no" title="statement not covered" >-this.scroller.y</span>
let delta = <span class="cstat-no" title="statement not covered" >scrollTop - this.anchorScrollTop</span>
<span class="cstat-no" title="statement not covered" > if (scrollTop === 0) {</span>
<span class="cstat-no" title="statement not covered" > this.anchorItem = {</span>
index: 0,
offset: 0
}
} else {
<span class="cstat-no" title="statement not covered" > this.anchorItem = this._calculateAnchoredItem(this.anchorItem, delta)</span>
}
<span class="cstat-no" title="statement not covered" > this.anchorScrollTop = scrollTop</span>
let lastScreenItem = <span class="cstat-no" title="statement not covered" >this._calculateAnchoredItem(this.anchorItem, this.scroller.wrapperHeight)</span>
let start = <span class="cstat-no" title="statement not covered" >this.anchorItem.index</span>
let end = <span class="cstat-no" title="statement not covered" >lastScreenItem.index</span>
<span class="cstat-no" title="statement not covered" > if (delta < 0) {</span>
<span class="cstat-no" title="statement not covered" > start -= RUNWAY_ITEMS</span>
<span class="cstat-no" title="statement not covered" > end += RUNWAY_ITEMS_OPPOSITE</span>
} else {
<span class="cstat-no" title="statement not covered" > start -= RUNWAY_ITEMS_OPPOSITE</span>
<span class="cstat-no" title="statement not covered" > end += RUNWAY_ITEMS</span>
}
<span class="cstat-no" title="statement not covered" > this.fill(start, end)</span>
<span class="cstat-no" title="statement not covered" > this.maybeRequestContent()</span>
}
InfiniteScroller.prototype.onResize = function () <span class="fstat-no" title="function not covered" >{</span>
let tombstone = <span class="cstat-no" title="statement not covered" >this.options.createTombstone()</span>
<span class="cstat-no" title="statement not covered" > tombstone.style.position = 'absolute'</span>
<span class="cstat-no" title="statement not covered" > this.scrollerEl.appendChild(tombstone)</span>
<span class="cstat-no" title="statement not covered" > tombstone.style.display = ''</span>
<span class="cstat-no" title="statement not covered" > this.tombstoneHeight = tombstone.offsetHeight</span>
<span class="cstat-no" title="statement not covered" > this.tombstoneWidth = tombstone.offsetWidth</span>
<span class="cstat-no" title="statement not covered" > this.scrollerEl.removeChild(tombstone)</span>
<span class="cstat-no" title="statement not covered" > for (let i = 0; i < this.items.length; i++) {</span>
<span class="cstat-no" title="statement not covered" > this.items[i].height = this.items[i].width = 0</span>
}
<span class="cstat-no" title="statement not covered" > this.onScroll()</span>
}
InfiniteScroller.prototype.fill = function (start, end) <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" > this.firstAttachedItem = Math.max(0, start)</span>
<span class="cstat-no" title="statement not covered" > if (!this.hasMore) {</span>
<span class="cstat-no" title="statement not covered" > end = Math.min(end, this.items.length)</span>
}
<span class="cstat-no" title="statement not covered" > this.lastAttachedItem = end</span>
<span class="cstat-no" title="statement not covered" > this.attachContent()</span>
}
InfiniteScroller.prototype.maybeRequestContent = function () <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" > if (this.requestInProgress || !this.hasMore) {</span>
<span class="cstat-no" title="statement not covered" > return</span>
}
let itemsNeeded = <span class="cstat-no" title="statement not covered" >this.lastAttachedItem - this.loadedItems</span>
<span class="cstat-no" title="statement not covered" > if (itemsNeeded <= 0) {</span>
<span class="cstat-no" title="statement not covered" > return</span>
}
<span class="cstat-no" title="statement not covered" > this.requestInProgress = true</span>
<span class="cstat-no" title="statement not covered" > this.options.fetch(itemsNeeded).then((items) => <span class="fstat-no" title="function not covered" >{</span></span>
<span class="cstat-no" title="statement not covered" > this.requestInProgress = false</span>
<span class="cstat-no" title="statement not covered" > if (items) {</span>
<span class="cstat-no" title="statement not covered" > this.addContent(items)</span>
} else {
<span class="cstat-no" title="statement not covered" > this.hasMore = false</span>
let tombstoneLen = <span class="cstat-no" title="statement not covered" >this._removeTombstones()</span>
let curPos = <span class="cstat-no" title="statement not covered" >0</span>
<span class="cstat-no" title="statement not covered" > if (this.anchorItem.index <= this.items.length) {</span>
<span class="cstat-no" title="statement not covered" > curPos = this._fixScrollPosition()</span>
<span class="cstat-no" title="statement not covered" > this._setupAnimations({}, curPos)</span>
<span class="cstat-no" title="statement not covered" > this.scroller.resetPosition(this.scroller.options.bounceTime)</span>
} else {
<span class="cstat-no" title="statement not covered" > this.anchorItem.index -= tombstoneLen</span>
<span class="cstat-no" title="statement not covered" > curPos = this._fixScrollPosition()</span>
<span class="cstat-no" title="statement not covered" > this._setupAnimations({}, curPos)</span>
<span class="cstat-no" title="statement not covered" > this.scroller.stop()</span>
<span class="cstat-no" title="statement not covered" > this.scroller.resetPosition()</span>
<span class="cstat-no" title="statement not covered" > this.onScroll()</span>
}
}
})
}
InfiniteScroller.prototype.addContent = function (items) <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" > for (let i = 0; i < items.length; i++) {</span>
<span class="cstat-no" title="statement not covered" > if (this.items.length <= this.loadedItems) {</span>
<span class="cstat-no" title="statement not covered" > this._addItem()</span>
}
<span class="cstat-no" title="statement not covered" > this.items[this.loadedItems++].data = items[i]</span>
}
<span class="cstat-no" title="statement not covered" > this.attachContent()</span>
<span class="cstat-no" title="statement not covered" > this.maybeRequestContent()</span>
}
InfiniteScroller.prototype.attachContent = function () <span class="fstat-no" title="function not covered" >{</span>
let unusedNodes = <span class="cstat-no" title="statement not covered" >this._collectUnusedNodes()</span>
let tombstoneAnimations = <span class="cstat-no" title="statement not covered" >this._createDOMNodes(unusedNodes)</span>
<span class="cstat-no" title="statement not covered" > this._cleanupUnusedNodes(unusedNodes)</span>
<span class="cstat-no" title="statement not covered" > this._cacheNodeSize()</span>
let curPos = <span class="cstat-no" title="statement not covered" >this._fixScrollPosition()</span>
<span class="cstat-no" title="statement not covered" > this._setupAnimations(tombstoneAnimations, curPos)</span>
}
InfiniteScroller.prototype.resetMore = function () <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" > this.hasMore = true</span>
}
InfiniteScroller.prototype._removeTombstones = function () <span class="fstat-no" title="function not covered" >{</span>
let markIndex
let tombstoneLen = <span class="cstat-no" title="statement not covered" >0</span>
let itemLen = <span class="cstat-no" title="statement not covered" >this.items.length</span>
<span class="cstat-no" title="statement not covered" > for (let i = 0; i < itemLen; i++) {</span>
const currentNode = <span class="cstat-no" title="statement not covered" >this.items[i].node</span>
const currentData = <span class="cstat-no" title="statement not covered" >this.items[i].data</span>
<span class="cstat-no" title="statement not covered" > if ((!currentNode || isTombstoneNode(currentNode)) && !currentData) {</span>
// 0 should be excluded
<span class="cstat-no" title="statement not covered" > if (markIndex === void 0) {</span>
<span class="cstat-no" title="statement not covered" > markIndex = i</span>
}
<span class="cstat-no" title="statement not covered" > if (currentNode) {</span>
<span class="cstat-no" title="statement not covered" > this.scrollerEl.removeChild(currentNode)</span>
}
}
}
<span class="cstat-no" title="statement not covered" > tombstoneLen = itemLen - markIndex</span>
<span class="cstat-no" title="statement not covered" > this.items.splice(markIndex)</span>
<span class="cstat-no" title="statement not covered" > this.lastAttachedItem = Math.min(this.lastAttachedItem, this.items.length)</span>
<span class="cstat-no" title="statement not covered" > return tombstoneLen</span>
}
InfiniteScroller.prototype._collectUnusedNodes = function () <span class="fstat-no" title="function not covered" >{</span>
let unusedNodes = <span class="cstat-no" title="statement not covered" >[]</span>
<span class="cstat-no" title="statement not covered" > for (let i = 0; i < this.items.length; i++) {</span>
// Skip the items which should be visible.
<span class="cstat-no" title="statement not covered" > if (i === this.firstAttachedItem) {</span>
<span class="cstat-no" title="statement not covered" > i = this.lastAttachedItem - 1</span>
<span class="cstat-no" title="statement not covered" > continue</span>
}
const currentNode = <span class="cstat-no" title="statement not covered" >this.items[i].node</span>
<span class="cstat-no" title="statement not covered" > if (currentNode) {</span>
<span class="cstat-no" title="statement not covered" > if (isTombstoneNode(currentNode)) {</span>
// Cache tombstones for reuse
<span class="cstat-no" title="statement not covered" > this.tombstones.push(currentNode)</span>
<span class="cstat-no" title="statement not covered" > this.tombstones[this.tombstones.length - 1].style.display = 'none'</span>
} else {
<span class="cstat-no" title="statement not covered" > unusedNodes.push(currentNode)</span>
}
}
<span class="cstat-no" title="statement not covered" > this.items[i].node = null</span>
}
<span class="cstat-no" title="statement not covered" > return unusedNodes</span>
}
InfiniteScroller.prototype._createDOMNodes = function (unusedNodes) <span class="fstat-no" title="function not covered" >{</span>
let tombstoneAnimations = <span class="cstat-no" title="statement not covered" >{}</span>
<span class="cstat-no" title="statement not covered" > for (let i = this.firstAttachedItem; i < this.lastAttachedItem; i++) {</span>
<span class="cstat-no" title="statement not covered" > while (this.items.length <= i) {</span>
<span class="cstat-no" title="statement not covered" > this._addItem()</span>
}
const currentNode = <span class="cstat-no" title="statement not covered" >this.items[i].node</span>
const currentData = <span class="cstat-no" title="statement not covered" >this.items[i].data</span>
<span class="cstat-no" title="statement not covered" > if (currentNode) {</span>
<span class="cstat-no" title="statement not covered" > if (isTombstoneNode(currentNode) && currentData) {</span>
<span class="cstat-no" title="statement not covered" > currentNode.style.zIndex = 1</span>
<span class="cstat-no" title="statement not covered" > tombstoneAnimations[i] = [currentNode, this.items[i].top - this.anchorScrollTop]</span>
<span class="cstat-no" title="statement not covered" > this.items[i].node = null</span>
} else {
<span class="cstat-no" title="statement not covered" > continue</span>
}
}
let node = <span class="cstat-no" title="statement not covered" >currentData ? this.options.render(currentData, unusedNodes.pop()) : this._getTombStone()</span>
<span class="cstat-no" title="statement not covered" > node.style.position = 'absolute'</span>
<span class="cstat-no" title="statement not covered" > this.items[i].top = -1</span>
<span class="cstat-no" title="statement not covered" > this.scrollerEl.appendChild(node)</span>
<span class="cstat-no" title="statement not covered" > this.items[i].node = node</span>
}
<span class="cstat-no" title="statement not covered" > return tombstoneAnimations</span>
}
InfiniteScroller.prototype._cleanupUnusedNodes = function (unusedNodes) <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" > while (unusedNodes.length) {</span>
<span class="cstat-no" title="statement not covered" > this.scrollerEl.removeChild(unusedNodes.pop())</span>
}
}
InfiniteScroller.prototype._cacheNodeSize = function () <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" > for (let i = this.firstAttachedItem; i < this.lastAttachedItem; i++) {</span>
const item = <span class="cstat-no" title="statement not covered" >this.items[i]</span>
// Only cache the height if we have the real contents, not a placeholder.
<span class="cstat-no" title="statement not covered" > if (item.data && !item.height) {</span>
const isTombstone = <span class="cstat-no" title="statement not covered" >isTombstoneNode(item.node)</span>
<span class="cstat-no" title="statement not covered" > item.height = isTombstone ? this.tombstoneHeight : item.node.offsetHeight</span>
<span class="cstat-no" title="statement not covered" > item.width = isTombstone ? this.tombstoneWidth : item.node.offsetWidth</span>
}
}
}
InfiniteScroller.prototype._fixScrollPosition = function () <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" > this.anchorScrollTop = 0</span>
<span class="cstat-no" title="statement not covered" > for (let i = 0; i < this.anchorItem.index; i++) {</span>
<span class="cstat-no" title="statement not covered" > this.anchorScrollTop += this.items[i].height || this.tombstoneHeight</span>
}
<span class="cstat-no" title="statement not covered" > this.anchorScrollTop += this.anchorItem.offset</span>
// Position all nodes.
let curPos = <span class="cstat-no" title="statement not covered" >this.anchorScrollTop - this.anchorItem.offset</span>
let i = <span class="cstat-no" title="statement not covered" >this.anchorItem.index</span>
<span class="cstat-no" title="statement not covered" > while (i > this.firstAttachedItem) {</span>
<span class="cstat-no" title="statement not covered" > curPos -= this.items[i - 1].height || this.tombstoneHeight</span>
<span class="cstat-no" title="statement not covered" > i--</span>
}
<span class="cstat-no" title="statement not covered" > return curPos</span>
}
InfiniteScroller.prototype._setupAnimations = function (tombstoneAnimations, curPos) <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" > for (let i in tombstoneAnimations) {</span>
const animation = <span class="cstat-no" title="statement not covered" >tombstoneAnimations[i]</span>
<span class="cstat-no" title="statement not covered" > this.items[i].node.style[style.transform] = `translateY(${this.anchorScrollTop + animation[1]}px) scale(${this.tombstoneWidth / this.items[i].width}, ${this.tombstoneHeight / this.items[i].height})`</span>
// Call offsetTop on the nodes to be animated to force them to apply current transforms.
/* eslint-disable no-unused-expressions */
<span class="cstat-no" title="statement not covered" > this.items[i].node.offsetTop</span>
<span class="cstat-no" title="statement not covered" > animation[0].offsetTop</span>
<span class="cstat-no" title="statement not covered" > this.items[i].node.style[style.transition] = `${cssVendor}transform ${ANIMATION_DURATION_MS}ms`</span>
}
<span class="cstat-no" title="statement not covered" > for (let i = this.firstAttachedItem; i < this.lastAttachedItem; i++) {</span>
const animation = <span class="cstat-no" title="statement not covered" >tombstoneAnimations[i]</span>
<span class="cstat-no" title="statement not covered" > if (animation) {</span>
const tombstoneNode = <span class="cstat-no" title="statement not covered" >animation[0]</span>
<span class="cstat-no" title="statement not covered" > tombstoneNode.style[style.transition] = `${cssVendor}transform ${ANIMATION_DURATION_MS}ms, opacity ${ANIMATION_DURATION_MS}ms`</span>
<span class="cstat-no" title="statement not covered" > tombstoneNode.style[style.transform] = `translateY(${curPos}px) scale(${this.items[i].width / this.tombstoneWidth}, ${this.items[i].height / this.tombstoneHeight})`</span>
<span class="cstat-no" title="statement not covered" > tombstoneNode.style.opacity = 0</span>
}
<span class="cstat-no" title="statement not covered" > if (curPos !== this.items[i].top) {</span>
<span class="cstat-no" title="statement not covered" > if (!animation) {</span>
<span class="cstat-no" title="statement not covered" > this.items[i].node.style[style.transition] = ''</span>
}
<span class="cstat-no" title="statement not covered" > this.items[i].node.style[style.transform] = `translateY(${curPos}px)`</span>
}
<span class="cstat-no" title="statement not covered" > this.items[i].top = curPos</span>
<span class="cstat-no" title="statement not covered" > curPos += this.items[i].height || this.tombstoneHeight</span>
}
<span class="cstat-no" title="statement not covered" > this.scroller.maxScrollY = -(curPos - this.scroller.wrapperHeight + (this.hasMore ? DEFAULT_SCROLL_RUNWAY : 0))</span>
const tombstoneAnimationsHandler = <span class="cstat-no" title="statement not covered" >setTimeout(() => <span class="fstat-no" title="function not covered" >{</span></span>
<span class="cstat-no" title="statement not covered" > for (let i in tombstoneAnimations) {</span>
const animation = <span class="cstat-no" title="statement not covered" >tombstoneAnimations[i]</span>
<span class="cstat-no" title="statement not covered" > animation[0].style.display = 'none'</span>
// Tombstone can be recycled now.
<span class="cstat-no" title="statement not covered" > this.tombstones.push(animation[0])</span>
}
}, ANIMATION_DURATION_MS)
<span class="cstat-no" title="statement not covered" > this.tombstonesAnimationHandlers.push(tombstoneAnimationsHandler)</span>
}
InfiniteScroller.prototype._getTombStone = function () <span class="fstat-no" title="function not covered" >{</span>
let tombstone = <span class="cstat-no" title="statement not covered" >this.tombstones.pop()</span>
<span class="cstat-no" title="statement not covered" > if (tombstone) {</span>
<span class="cstat-no" title="statement not covered" > tombstone.style.display = ''</span>
<span class="cstat-no" title="statement not covered" > tombstone.style.opacity = 1</span>
<span class="cstat-no" title="statement not covered" > tombstone.style[style.transform] = ''</span>
<span class="cstat-no" title="statement not covered" > tombstone.style[style.transition] = ''</span>
<span class="cstat-no" title="statement not covered" > return tombstone</span>
}
<span class="cstat-no" title="statement not covered" > return this.options.createTombstone()</span>
}
InfiniteScroller.prototype._addItem = function () <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" > this.items.push({</span>
data: null,
node: null,
height: 0,
width: 0,
top: 0
})
}
InfiniteScroller.prototype._calculateAnchoredItem = function (initialAnchor, delta) <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" > if (delta === 0) {</span>
<span class="cstat-no" title="statement not covered" > return initialAnchor</span>
}
let i = <span class="cstat-no" title="statement not covered" >initialAnchor.index</span>
let tombstones = <span class="cstat-no" title="statement not covered" >0</span>
<span class="cstat-no" title="statement not covered" > delta += initialAnchor.offset</span>
<span class="cstat-no" title="statement not covered" > if (delta < 0) {</span>
<span class="cstat-no" title="statement not covered" > while (delta < 0 && i > 0 && this.items[i - 1].height) {</span>
<span class="cstat-no" title="statement not covered" > delta += this.items[i - 1].height</span>
<span class="cstat-no" title="statement not covered" > i--</span>
}
<span class="cstat-no" title="statement not covered" > tombstones = Math.max(-i, Math.ceil(Math.min(delta, 0) / this.tombstoneHeight))</span>
} else {
<span class="cstat-no" title="statement not covered" > while (delta > 0 && i < this.items.length && this.items[i].height && this.items[i].height < delta) {</span>
<span class="cstat-no" title="statement not covered" > delta -= this.items[i].height</span>
<span class="cstat-no" title="statement not covered" > i++</span>
}
<span class="cstat-no" title="statement not covered" > if (i >= this.items.length || !this.items[i].height) {</span>
<span class="cstat-no" title="statement not covered" > tombstones = Math.floor(Math.max(delta, 0) / this.tombstoneHeight)</span>
}
}
<span class="cstat-no" title="statement not covered" > i += tombstones</span>
<span class="cstat-no" title="statement not covered" > delta -= tombstones * this.tombstoneHeight</span>
<span class="cstat-no" title="statement not covered" > return {</span>
index: i,
offset: delta
}
}
</pre></td></tr>
</table></pre>
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