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960 lines (764 loc) · 23.3 KB
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// (c) 2012 Airbnb, Inc.
//
// infinity.js may be freely distributed under the terms of the BSD
// license. For all licensing information, details, and documention:
// http://airbnb.github.com/infinity
!function(window, Math, $) {
'use strict';
// Welcome To Infinity
// ===================
//
// infinity.js is a UITableView for the web. Use it to speed up scroll
// performance of long- or infinitely-scrolling lists of items.
//
// infinity.js has several caveats:
//
// 1. All DOM elements must either be visible or in the current layout.
// infinity.js does not support elements that will at some point affect the
// layout, but are currently hidden using `display:none`.
//
// 2. ListViews can't be nested.
//
// 3. Non-ListItem elements can't be the immediate children of ListView
// elements. Only ListItems can be immediate children of ListViews.
//
// 4. ListView elements can't have heights set directly on them. In most
// cases it is also likely that `min-height`s and `max-height`s will break.
// However, setting heights on ListItems is ok.
//
// If you're reading this, we probably want to hear from you. If the feeling
// is mutual: [get in touch.](http://www.airbnb.com/jobs)
// Initial Setup
// =============
// Cached objects
var $window = $(window);
// Packaging:
var oldInfinity = window.infinity,
infinity = window.infinity = {},
config = infinity.config = {};
// Constants:
var PAGE_ID_ATTRIBUTE = 'data-infinity-pageid',
NUM_BUFFER_PAGES = 1,
PAGES_ONSCREEN = NUM_BUFFER_PAGES * 2 + 1;
// Config:
config.PAGE_TO_SCREEN_RATIO = 3;
config.SCROLL_THROTTLE = 350;
// ListView Class
// ==============
// ### Constructor
//
// Creates a new instance of a ListView.
//
// Takes:
//
// - `$el`: a jQuery element.
// - `options`: an optional hash of options
function ListView($el, options) {
options = options || {};
this.$el = blankDiv();
this.$shadow = blankDiv();
$el.append(this.$el);
// don't append the shadow element -- it's meant to only be used for
// finding elements outside of the DOM
this.lazy = !!options.lazy;
this.lazyFn = options.lazy || null;
initBuffer(this);
this.top = this.$el.offset().top;
this.width = 0;
this.height = 0;
this.pages = [];
this.startIndex = 0;
DOMEvent.attach(this);
}
// ### initBuffer
//
// Private ListView method. Initializes the buffer element.
function initBuffer(listView) {
listView._$buffer = blankDiv()
.prependTo(listView.$el);
}
// ### updateBuffer
//
// Private ListView method. Updates the buffer to correctly push forward the
// first page.
function updateBuffer(listView) {
var firstPage,
pages = listView.pages,
$buffer = listView._$buffer;
if(pages.length > 0) {
firstPage = pages[listView.startIndex];
$buffer.height(firstPage.top);
} else {
$buffer.height(0);
}
}
// ListView manipulation
// ---------------------
// ### append
//
// Appends a jQuery element or a ListItem to the ListView.
//
// Takes:
//
// - `obj`: a jQuery element, a string of valid HTML, or a ListItem.
//
// TODO: optimized batch appends
ListView.prototype.append = function(obj) {
if(!obj || !obj.length) return null;
var lastPage,
item = convertToItem(this, obj),
pages = this.pages;
this.height += item.height;
this.$el.height(this.height);
lastPage = pages[pages.length - 1];
if(!lastPage || !lastPage.hasVacancy()) {
lastPage = new Page(this);
pages.push(lastPage);
}
lastPage.append(item);
insertPagesInView(this);
return item;
};
// ### cacheCoordsFor
//
// Caches the coordinates for a given ListItem within the given ListView.
//
// Takes:
//
// - `listView`: a ListView.
// - `listItem`: the ListItem whose coordinates you want to cache.
function cacheCoordsFor(listView, listItem) {
listItem.$el.remove();
// WARNING: this will always break for prepends. Once support gets added for
// prepends, change this.
listView.$el.append(listItem.$el);
updateCoords(listItem, listView.height);
listItem.$el.remove();
}
// ### insertPagesInView
//
// Inserts any uninserted pages the given ListView owns.
//
// Takes:
//
// - `listView`: the ListView whose onscreen pages you'd like to insert.
function insertPagesInView(listView) {
var index, length, curr,
pages = listView.pages,
inserted = false,
inOrder = true;
index = listView.startIndex;
length = Math.min(index + PAGES_ONSCREEN, pages.length);
for(index; index < length; index++) {
curr = pages[index];
if(listView.lazy) curr.lazyload(listView.lazyFn);
if(inserted && curr.onscreen) inOrder = false;
if(!inOrder) {
curr.stash(listView.$shadow);
curr.appendTo(listView.$el);
} else if(!curr.onscreen) {
inserted = true;
curr.appendTo(listView.$el);
}
}
}
// ### updateStartIndex
//
// Updates a given ListView when the throttled scroll event fires. Attempts
// to do as little work as possible: if the `startIndex` doesn't change,
// it'll exit early. If the `startIndex` does change, it finds all pages
// that have been scrolled out of view and removes them, then inserts only
// pages that have been now been scrolled into view.
//
// Takes:
//
// - `listView`: the ListView needing to be updated.
function updateStartIndex(listView) {
var index, length, pages, lastIndex, nextLastIndex,
startIndex = listView.startIndex,
viewTop = $window.scrollTop() - listView.top,
viewHeight = $window.height(),
viewBottom = viewTop + viewHeight,
nextIndex = startIndexWithinRange(listView, viewTop, viewBottom);
if( nextIndex < 0 || nextIndex === startIndex) return startIndex;
pages = listView.pages;
startIndex = listView.startIndex;
lastIndex = Math.min(startIndex + PAGES_ONSCREEN, pages.length);
nextLastIndex = Math.min(nextIndex + PAGES_ONSCREEN, pages.length);
// sweep any invalid old pages
for(index = startIndex, length = lastIndex; index < length; index++) {
if(index < nextIndex || index >= nextLastIndex)
pages[index].stash(listView.$shadow);
}
listView.startIndex = nextIndex;
insertPagesInView(listView);
updateBuffer(listView);
return nextIndex;
}
// ### remove
//
// Removes the ListView from the DOM and cleans up after it.
ListView.prototype.remove = function() {
this.$el.remove();
this.cleanup();
};
// ### convertToItem
//
// Given an object that is either a ListItem instance, a jQuery element, or a
// string of valid HTML, makes sure to return either the ListItem itself or
// a new ListItem that wraps the element.
//
// Takes:
//
// - `listView`: the ListView instance that wants the item.
// - `possibleItem`: an object that is either a ListItem, a jQuery element,
// or a string of valid HTML.
function convertToItem(listView, possibleItem) {
var item;
if(possibleItem instanceof ListItem) return possibleItem;
if(typeof possibleItem === 'string') possibleItem = $(possibleItem);
item = new ListItem(possibleItem);
cacheCoordsFor(listView, item);
return item;
}
// ### tooSmall
//
// Alerts the given ListView that the given Page is too small. May result
// in modifications to the `pages` array.
function tooSmall(listView, page) {
// Naive solution:
repartition(listView);
}
// ### repartition
//
// Repartitions the pages array. This can be used for either defragmenting
// the array, or recalculating everything on screen resize.
function repartition(listView) {
var currPage, newPage, index, length, itemIndex, pageLength, currItems, currItem,
nextItem,
pages = listView.pages,
newPages = [];
newPage = new Page(listView);
newPages.push(newPage);
for(index = 0, length = pages.length; index < length; index++) {
currPage = pages[index];
currItems = currPage.items;
for(itemIndex = 0, pageLength = currItems.length; itemIndex < pageLength; itemIndex++) {
currItem = currItems[itemIndex];
nextItem = currItem.clone();
if(newPage.hasVacancy()) {
newPage.append(nextItem);
} else {
newPage = new Page(listView);
newPages.push(newPage);
newPage.append(nextItem);
}
}
currPage.remove();
}
listView.pages = newPages;
insertPagesInView(listView);
}
// ListView querying
// -----------------
// ### find
//
// Given a selector string or jQuery element, return the items that hold the
// given or matching elements.
//
// Note: this is slower than an ordinary jQuery find. However, using jQuery
// to find elements will be bug-prone, since most of the elements won't be in
// the DOM tree. Caching elements is usually important, but it's even more
// important to do here.
//
// Arguments:
//
// - `findObj`: A selector string, or a jQuery element.
//
// Returns a ListItem.
ListView.prototype.find = function(findObj) {
var items, $onscreen, $offscreen;
// If given a selector string, find everything matching onscreen and
// offscreen, and return both.
if(typeof findObj === 'string') {
$>
$offscreen = this.$shadow.find(findObj);
return this.find($onscreen).concat(this.find($offscreen));
}
// Silly option, but might as well.
if(findObj instanceof ListItem) return [findObj];
// jQuery element
items = [];
findObj.each(function() {
var pageId, page, pageItems, index, length, currItem,
$itemEl = $(this).parentsUntil('[' + PAGE_ID_ATTRIBUTE + ']').andSelf().first(),
$pageEl = $itemEl.parent();
pageId = $pageEl.attr(PAGE_ID_ATTRIBUTE);
page = PageRegistry.lookup(pageId);
if(page) {
pageItems = page.items;
for(index = 0, length = pageItems.length; index < length; index++) {
currItem = pageItems[index];
if(currItem.$el.is($itemEl)) {
items.push(currItem);
break;
}
}
}
});
return items;
};
// ### startIndexWithinRange
//
// Finds the starting index for a listView, given a range. Wraps
// indexWithinRange.
//
// Takes:
//
// - `listView`: the ListView whose startIndex you're calculating.
// - `top`: the top of the range.
// - `bottom`: the bottom of the range.
function startIndexWithinRange(listView, top, bottom) {
var index = indexWithinRange(listView, top, bottom);
index = Math.max(index - NUM_BUFFER_PAGES, 0);
index = Math.min(index, listView.pages.length);
return index;
}
// ### indexWithinRange
//
// Finds the index of the page closest to being within a given range. It's
// less useful than its wrapper function startIndexWithinRange, and you
// probably won't need to call this unwrapped version.
//
// Takes:
//
// - `listView`: the ListView instance whose pages you're looking at.
// - `top`: the top of the range.
// - `bottom`: the bottom of the range.
function indexWithinRange(listView, top, bottom) {
var index, length, curr, startIndex, midpoint, diff, prevDiff,
pages = listView.pages,
rangeMidpoint = top + (bottom - top)/2;
// Start looking at the index of the page last contained by the screen --
// not the first page in the onscreen pages
startIndex = Math.min(listView.startIndex + NUM_BUFFER_PAGES,
pages.length - 1);
if(pages.length <= 0) return -1;
curr = pages[startIndex];
midpoint = curr.top + curr.height/2;
prevDiff = rangeMidpoint - midpoint;
if(prevDiff < 0) {
// Search above
for(index = startIndex - 1; index >= 0; index--) {
curr = pages[index];
midpoint = curr.top + curr.height/2;
diff = rangeMidpoint - midpoint;
if(diff > 0) {
if(diff < -prevDiff) return index;
return index + 1;
}
prevDiff = diff;
}
return 0;
} else if (prevDiff > 0) {
// Search below
for(index = startIndex + 1, length = pages.length; index < length; index++) {
curr = pages[index];
midpoint = curr.top + curr.height/2;
diff = rangeMidpoint - midpoint;
if(diff < 0) {
if(-diff < prevDiff) return index;
return index - 1;
}
prevDiff = diff;
}
return pages.length - 1;
}
// Perfect hit! Return it.
return startIndex;
}
// ListView cleanup
// ----------------
ListView.prototype.cleanup = function() {
var pages = this.pages,
page;
DOMEvent.detach(this);
while(page = pages.pop()) {
page.cleanup();
}
};
// ListView event binding
// ----------------------
//
// Internal scroll and resize binding and throttling. Allows ListViews to
// bind to a throttled scroll event (and debounced resize event), and updates
// them as it fires.
var DOMEvent = (function() {
var eventIsBound = false,
scrollScheduled = false,
resizeTimeout = null,
boundViews = [];
// ### scrollHandler
//
// Callback called on scroll. Schedules a `scrollAll` callback if needed,
// and disallows future scheduling.
function scrollHandler() {
if(!scrollScheduled) {
setTimeout(scrollAll, config.SCROLL_THROTTLE);
scrollScheduled = true;
}
}
// ### scrollAll
//
// Callback passed to the setTimeout throttle. Calls `scrollListView` on
// every bound ListView, and then allows new scroll events to be
// scheduled.
function scrollAll() {
var index, length;
for(index = 0, length = boundViews.length; index < length; index++) {
updateStartIndex(boundViews[index]);
}
scrollScheduled = false;
}
// ### resizeHandler
//
// Callback called on resize. Debounces a `resizeAll` callback.
function resizeHandler() {
if(resizeTimeout) clearTimeout(resizeTimeout);
resizeTimeout = setTimeout(resizeAll, 200);
}
// ### resizeAll
//
// Handles resizing all ListViews. Just calls `repartition` on them for
// now.
function resizeAll() {
var index, curr;
for(index = 0; curr = boundViews[index]; index++) {
repartition(curr);
}
}
return {
// ### attach
//
// Binds a given ListView to a throttled scroll event. Does not create
// multiple event handlers if called by multiple ListViews.
//
// Takes:
//
// - `listView`: a ListView that is not currently bound to the scroll
// event.
attach: function(listView) {
if(!eventIsBound) {
$window.on('scroll', scrollHandler);
$window.on('resize', resizeHandler);
eventIsBound = true;
}
boundViews.push(listView);
},
// ### detach
//
// Detaches a bound ListView from the throttled scroll event. If no
// ListViews remain bound to the throttled scroll, unbinds the scroll
// handler from the window's scroll event.
//
// Returns true if the listView was successfully detached, and false
// otherwise.
//
// Takes:
//
// - `listView`: a ListView that is currently bound to the scroll event.
detach: function(listView) {
var index, length;
for(index = 0, length = boundViews.length; index < length; index++) {
if(boundViews[index] === listView) {
boundViews.splice(index, 1);
if(boundViews.length === 0) {
$window.off('scroll', scrollHandler);
$window.off('resize', resizeHandler);
eventIsBound = false;
}
return true;
}
}
return false;
}
};
}());
// Page class
// ==========
//
// An internal class used for ordering items into roughly screen-sized pages.
// Pages are removed and added to the DOM wholesale as they come in and out
// of view.
function Page(parent) {
this.parent = parent;
this.items = [];
this.$el = blankDiv();
this.id = PageRegistry.generatePageId(this);
this.$el.attr(PAGE_ID_ATTRIBUTE, this.id);
this.top = 0;
this.bottom = 0;
this.width = 0;
this.height = 0;
this.lazyloaded = false;
this.>
}
// ### append
//
// Appends a ListItem to the Page.
//
// Takes:
//
// - `item`: a ListItem.
Page.prototype.append = function(item) {
var items = this.items;
// Recompute coords, sizing.
if(items.length === 0) this.top = item.top;
this.bottom = item.bottom;
this.width = this.width > item.width ? this.width : item.width;
this.height = this.bottom - this.top;
items.push(item);
item.parent = this;
this.$el.append(item.$el);
this.lazyloaded = false;
};
// ### prepend
//
// Prepends a ListItem to the Page.
//
// Takes:
//
// - `item`: a ListItem.
Page.prototype.prepend = function(item) {
var items = this.items;
// Recompute coords, sizing.
this.bottom += item.height;
this.width = this.width > item.width ? this.width : item.width;
this.height = this.bottom - this.top;
items.push(item);
item.parent = this;
this.$el.prepend(item.$el);
this.lazyloaded = false;
};
// ### hasVacancy
//
// Returns false if the Page is at max capacity; false otherwise.
Page.prototype.hasVacancy = function() {
return this.height < $window.height() * config.PAGE_TO_SCREEN_RATIO;
};
// ### appendTo
//
// Proxies to jQuery to append the Page to the given jQuery element.
Page.prototype.appendTo = function($el) {
if(!this.onscreen) {
this.$el.appendTo($el);
this.>
}
};
// ### prependTo
//
// Proxies to jQuery to prepend the Page to the given jQuery element.
Page.prototype.prependTo = function($el) {
if(!this.onscreen) {
this.$el.prependTo($el);
this.>
}
};
// ### stash
//
// Temporarily stash the onscreen page under a different element.
Page.prototype.stash = function($el) {
if(this.onscreen) {
this.$el.appendTo($el);
this.>
}
};
// ### remove
//
// Removes the Page from the DOM and cleans up after it.
Page.prototype.remove = function() {
if(this.onscreen) {
this.$el.remove();
this.>
}
this.cleanup();
};
// ### cleanup
//
// Cleans up the Page without removing it.
Page.prototype.cleanup = function() {
var items = this.items,
item;
this.parent = null;
PageRegistry.remove(this);
while (item = items.pop()) {
item.cleanup();
}
};
// ### lazyload
//
// Runs the given lazy-loading callback on all unloaded page content.
//
// Takes:
//
// - `callback`: a function of the form `function([$el]){}`. Will run on
<
EF6D
/div> // each unloaded element, and will use the element as its calling context.
Page.prototype.lazyload = function(callback) {
var $el = this.$el,
index, length;
if (!this.lazyloaded) {
for (index = 0, length = $el.length; index < length; index++) {
callback.call($el[index], $el[index]);
}
this.lazyloaded = true;
}
};
// Page Registry
// ------------
var PageRegistry = (function() {
var pages = [];
return {
generatePageId: function(page) {
return pages.push(page) - 1;
},
lookup: function(id) {
return pages[id] || null;
},
remove: function(page) {
var id = page.id;
if(!pages[id]) return false;
pages[id] = null;
return true;
}
};
}());
// ### removeItemFromPage
//
// Removes a given ListItem from the given Page.
function removeItemFromPage(item, page) {
var index, length, foundIndex,
items = page.items;
for(index = 0, length = items.length; index < length; index++) {
if(items[index] === item) {
foundIndex = index;
break;
}
}
if(foundIndex == null) return false;
items.splice(foundIndex, 1);
page.bottom -= item.height;
page.height = page.bottom - page.top;
if(page.hasVacancy()) tooSmall(page.parent, page);
return true;
}
// ListItem class
// ==============
//
// An individual item in the ListView.
//
// Has cached top, bottom, width, and height properties, determined from
// jQuery. This positioning data will be determined when the ListItem is
// inserted into a ListView; it can't be determined ahead of time.
//
// All positioning data is relative to the containing ListView.
function ListItem($el) {
this.$el = $el;
this.parent = null;
this.top = 0;
this.bottom = 0;
this.width = 0;
this.height = 0;
}
// ### clone
//
// Clones the ListItem.
ListItem.prototype.clone = function() {
var item = new ListItem(this.$el);
item.top = this.top;
item.bottom = this.bottom;
item.width = this.width;
item.height = this.height;
return item;
};
// ### remove
//
// Removes the ListItem and its elements from the page, and cleans up after
// them.
ListItem.prototype.remove = function() {
this.$el.remove();
removeItemFromPage(this, this.parent);
this.cleanup();
};
// ### cleanup
//
// Cleans up after the ListItem without removing it from the page.
ListItem.prototype.cleanup = function() {
this.parent = null;
};
// ### updateCoords
//
// Updates the coordinates of the given ListItem, assuming a given y-offset
// from the parent ListView.
//
// Takes:
//
// - `listItem`: the ListItem whose cached coordinates you want to update.
// - `yOffset`: the y-offset of the ListItem from its ListView parent.
function updateCoords(listItem, yOffset) {
var $el = listItem.$el;
listItem.top = yOffset;
listItem.height = $el.outerHeight(true);
listItem.bottom = listItem.top + listItem.height;
listItem.width = $el.width();
}
// Helper functions
// ================
// ### blankDiv
//
// Returns a new, empty `<div>` jQuery element. The `<div>` will have its
// border, margin, and padding set to zero or none, as appropriate.
function blankDiv() {
return $('<div>').css({
margin: 0,
padding: 0,
border: 'none'
});
}
// ### pxToInt
//
// Converts pixel values returned by jQuery to base-10 ints.
//
// Takes:
//
// - `px`: a string value, which starts with a number and is
// postfixed with the string `'px'`.
//function pxToInt(px) {
// return parseInt(px, 10);
//}
// Export
// ======
// Classes:
infinity.ListView = ListView;
infinity.Page = Page;
infinity.ListItem = ListItem;
//jQuery plugin
function registerPlugin(infinity) {
var ListView;
if(infinity) {
ListView = infinity.ListView;
$.fn.listView = function (options) {
return new ListView(this, options);
};
}
else {
delete $.fn.listView;
}
}
registerPlugin(infinity);
// Destroy own packaging:
infinity.noConflict = function() {
window.infinity = oldInfinity;
registerPlugin(oldInfinity);
return infinity;
};
}(window, Math, jQuery);
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