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951 lines
30 KiB
951 lines
30 KiB
/*
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* # Semantic - Visibility
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* http://github.com/semantic-org/semantic-ui/
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*
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*
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* Copyright 2014 Contributor
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* Released under the MIT license
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* http://opensource.org/licenses/MIT
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*
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*/
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;(function ( $, window, document, undefined ) {
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$.fn.visibility = function(parameters) {
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var
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$allModules = $(this),
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moduleSelector = $allModules.selector || '',
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time = new Date().getTime(),
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performance = [],
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query = arguments[0],
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methodInvoked = (typeof query == 'string'),
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queryArguments = [].slice.call(arguments, 1),
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returnedValue
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;
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$allModules
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.each(function() {
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var
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settings = $.extend(true, {}, $.fn.visibility.settings, parameters),
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className = settings.className,
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namespace = settings.namespace,
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error = settings.error,
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eventNamespace = '.' + namespace,
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moduleNamespace = 'module-' + namespace,
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$window = $(window),
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$module = $(this),
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$context = $(settings.context),
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$container = $module.offsetParent(),
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selector = $module.selector || '',
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instance = $module.data(moduleNamespace),
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requestAnimationFrame = window.requestAnimationFrame
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|| window.mozRequestAnimationFrame
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|| window.webkitRequestAnimationFrame
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|| window.msRequestAnimationFrame
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|| function(callback) { setTimeout(callback, 0); },
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element = this,
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module
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;
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module = {
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initialize: function() {
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module.verbose('Initializing visibility', settings);
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module.setup.cache();
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module.save.position();
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module.bindEvents();
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module.instantiate();
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if(settings.type == 'image') {
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module.setup.image();
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}
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if(settings.type == 'fixed') {
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module.setup.fixed();
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}
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requestAnimationFrame(module.checkVisibility);
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},
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instantiate: function() {
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module.verbose('Storing instance of module', module);
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instance = module;
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$module
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.data(moduleNamespace, module)
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;
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},
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destroy: function() {
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module.verbose('Destroying previous module');
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$module
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.off(eventNamespace)
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.removeData(moduleNamespace)
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;
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},
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bindEvents: function() {
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module.verbose('Binding visibility events to scroll and resize');
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$window
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.on('resize' + eventNamespace, module.event.refresh)
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;
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$context
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.on('scroll' + eventNamespace, module.event.scroll)
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;
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},
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event: {
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refresh: function() {
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requestAnimationFrame(module.refresh);
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},
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scroll: function() {
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module.verbose('Scroll position changed');
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if(settings.throttle) {
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clearTimeout(module.timer);
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module.timer = setTimeout(module.checkVisibility, settings.throttle);
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}
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else {
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requestAnimationFrame(module.checkVisibility);
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}
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}
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},
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precache: function(images, callback) {
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if (!(images instanceof Array)) {
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images = [images];
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}
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var
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imagesLength = images.length,
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loadedCounter = 0,
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cache = [],
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cacheImage = document.createElement('img'),
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handleLoad = function() {
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loadedCounter++;
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if (loadedCounter >= images.length) {
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if ($.isFunction(callback)) {
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callback();
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}
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}
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}
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;
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while (imagesLength--) {
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cacheImage = document.createElement('img');
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cacheImage.onload = handleLoad;
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cacheImage.onerror = handleLoad;
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cacheImage.src = images[imagesLength];
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cache.push(cacheImage);
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}
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},
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setup: {
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cache: function() {
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module.cache = {
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occurred : {},
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screen : {},
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element : {},
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};
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},
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image: function() {
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var
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src = $module.data('src')
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;
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if(src) {
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module.verbose('Lazy loading image', src);
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// show when top visible
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module.topVisible(function() {
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module.precache(src, function() {
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module.set.image(src);
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settings.onTopVisible = false;
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});
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});
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}
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},
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fixed: function() {
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module.verbose('Setting up fixed on element pass');
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$module
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.visibility({
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once: false,
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continuous: false,
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onTopPassed: function() {
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$module
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.addClass(className.fixed)
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.css({
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position: 'fixed',
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top: settings.offset + 'px'
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})
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;
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if(settings.animation && $.fn.transition !== undefined) {
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$module.transition(settings.transition, settings.duration);
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}
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},
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onTopPassedReverse: function() {
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$module
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.removeClass(className.fixed)
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.css({
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position: '',
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top: ''
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})
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;
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}
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})
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;
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}
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},
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set: {
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image: function(src) {
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var
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offScreen = (module.cache.screen.bottom < module.cache.element.top)
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;
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$module
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.attr('src', src)
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;
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if(offScreen) {
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module.verbose('Image outside browser, avoiding animation')
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$module.show();
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}
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else {
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if(settings.transition && $.fn.transition !== undefined) {
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$module.transition(settings.transition, settings.duration);
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}
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else {
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$module.fadeIn(settings.duration);
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}
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}
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}
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},
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refresh: function() {
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module.debug('Refreshing constants (element width/height)');
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module.reset();
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module.save.position();
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module.checkVisibility();
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$.proxy(settings.onRefresh, element)();
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},
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reset: function() {
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module.verbose('Reseting all cached values');
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if( $.isPlainObject(module.cache) ) {
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module.cache.screen = {};
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module.cache.element = {};
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}
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},
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checkVisibility: function() {
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module.verbose('Checking visibility of element', module.cache.element);
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module.save.scroll();
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module.save.direction();
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module.save.screenCalculations();
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module.save.elementCalculations();
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// percentage
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module.passed();
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// reverse (must be first)
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module.passingReverse();
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module.topVisibleReverse();
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module.bottomVisibleReverse();
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module.topPassedReverse();
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module.bottomPassedReverse();
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// one time
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module.passing();
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module.topVisible();
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module.bottomVisible();
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module.topPassed();
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module.bottomPassed();
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},
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passed: function(amount, newCallback) {
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var
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calculations = module.get.elementCalculations(),
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amountInPixels
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;
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// assign callback
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if(amount !== undefined && newCallback !== undefined) {
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settings.onPassed[amount] = newCallback;
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}
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else if(amount !== undefined) {
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return (module.get.pixelsPassed(amount) > calculations.pixelsPassed);
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}
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else if(calculations.passing) {
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$.each(settings.onPassed, function(amount, callback) {
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if(calculations.bottomVisible || calculations.pixelsPassed > module.get.pixelsPassed(amount)) {
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module.execute(callback, amount);
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}
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else if(!settings.once) {
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module.remove.occurred(callback);
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}
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});
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}
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},
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passing: function(newCallback) {
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var
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calculations = module.get.elementCalculations(),
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callback = newCallback || settings.onPassing,
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callbackName = 'passing'
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;
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if(newCallback) {
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module.debug('Adding callback for passing', newCallback);
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settings.onPassing = newCallback;
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}
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if(calculations.passing) {
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module.execute(callback, callbackName);
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}
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else if(!settings.once) {
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module.remove.occurred(callbackName);
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}
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if(newCallback !== undefined) {
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return calculations.passing;
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}
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},
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topVisible: function(newCallback) {
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var
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calculations = module.get.elementCalculations(),
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callback = newCallback || settings.onTopVisible,
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callbackName = 'topVisible'
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;
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if(newCallback) {
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module.debug('Adding callback for top visible', newCallback);
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settings.onTopVisible = newCallback;
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}
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if(calculations.topVisible) {
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module.execute(callback, callbackName);
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}
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else if(!settings.once) {
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module.remove.occurred(callbackName);
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}
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if(newCallback === undefined) {
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return calculations.topVisible;
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}
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},
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bottomVisible: function(newCallback) {
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var
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calculations = module.get.elementCalculations(),
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callback = newCallback || settings.onBottomVisible,
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callbackName = 'bottomVisible'
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;
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if(newCallback) {
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module.debug('Adding callback for bottom visible', newCallback);
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settings.onBottomVisible = newCallback;
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}
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if(calculations.bottomVisible) {
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module.execute(callback, callbackName);
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}
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else if(!settings.once) {
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module.remove.occurred(callbackName);
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}
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if(newCallback === undefined) {
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return calculations.bottomVisible;
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}
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},
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topPassed: function(newCallback) {
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var
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calculations = module.get.elementCalculations(),
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callback = newCallback || settings.onTopPassed,
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callbackName = 'topPassed'
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;
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if(newCallback) {
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module.debug('Adding callback for top passed', newCallback);
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settings.onTopPassed = newCallback;
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}
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if(calculations.topPassed) {
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module.execute(callback, callbackName);
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}
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else if(!settings.once) {
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module.remove.occurred(callbackName);
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}
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if(newCallback === undefined) {
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return calculations.onTopPassed;
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}
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},
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bottomPassed: function(newCallback) {
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var
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calculations = module.get.elementCalculations(),
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callback = newCallback || settings.onBottomPassed,
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callbackName = 'bottomPassed'
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;
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if(newCallback) {
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module.debug('Adding callback for bottom passed', newCallback);
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settings.onBottomPassed = newCallback;
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}
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if(calculations.bottomPassed) {
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module.execute(callback, callbackName);
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}
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else if(!settings.once) {
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module.remove.occurred(callbackName);
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}
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if(newCallback === undefined) {
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return calculations.bottomPassed;
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}
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},
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passingReverse: function(newCallback) {
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var
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calculations = module.get.elementCalculations(),
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callback = newCallback || settings.onPassingReverse,
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callbackName = 'passingReverse'
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;
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if(newCallback) {
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module.debug('Adding callback for passing reverse', newCallback);
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settings.onPassingReverse = newCallback;
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}
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if(!calculations.passing) {
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if(module.get.occurred('passing')) {
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module.execute(callback, callbackName);
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}
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}
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else if(!settings.once) {
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module.remove.occurred(callbackName);
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}
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if(newCallback !== undefined) {
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return !calculations.passing;
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}
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},
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topVisibleReverse: function(newCallback) {
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var
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calculations = module.get.elementCalculations(),
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callback = newCallback || settings.onTopVisibleReverse,
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callbackName = 'topVisibleReverse'
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;
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if(newCallback) {
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module.debug('Adding callback for top visible reverse', newCallback);
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settings.onTopVisibleReverse = newCallback;
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}
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if(!calculations.topVisible) {
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if(module.get.occurred('topVisible')) {
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module.execute(callback, callbackName);
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}
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}
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else if(!settings.once) {
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module.remove.occurred(callbackName);
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}
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if(newCallback === undefined) {
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return !calculations.topVisible;
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}
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},
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bottomVisibleReverse: function(newCallback) {
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var
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calculations = module.get.elementCalculations(),
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callback = newCallback || settings.onBottomVisibleReverse,
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callbackName = 'bottomVisibleReverse'
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;
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if(newCallback) {
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module.debug('Adding callback for bottom visible reverse', newCallback);
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settings.onBottomVisibleReverse = newCallback;
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}
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if(!calculations.bottomVisible) {
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if(module.get.occurred('bottomVisible')) {
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module.execute(callback, callbackName);
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}
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}
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else if(!settings.once) {
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module.remove.occurred(callbackName);
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}
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if(newCallback === undefined) {
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return !calculations.bottomVisible;
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}
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},
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topPassedReverse: function(newCallback) {
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var
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calculations = module.get.elementCalculations(),
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callback = newCallback || settings.onTopPassedReverse,
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callbackName = 'topPassedReverse'
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;
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if(newCallback) {
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module.debug('Adding callback for top passed reverse', newCallback);
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settings.onTopPassedReverse = newCallback;
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}
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if(!calculations.topPassed) {
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if(module.get.occurred('topPassed')) {
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module.execute(callback, callbackName);
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}
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}
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else if(!settings.once) {
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module.remove.occurred(callbackName);
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}
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if(newCallback === undefined) {
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return !calculations.onTopPassed;
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}
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},
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bottomPassedReverse: function(newCallback) {
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var
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calculations = module.get.elementCalculations(),
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callback = newCallback || settings.onBottomPassedReverse,
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callbackName = 'bottomPassedReverse'
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;
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if(newCallback) {
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module.debug('Adding callback for bottom passed reverse', newCallback);
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settings.onBottomPassedReverse = newCallback;
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}
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if(!calculations.bottomPassed) {
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if(module.get.occurred('bottomPassed')) {
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module.execute(callback, callbackName);
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}
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}
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else if(!settings.once) {
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module.remove.occurred(callbackName);
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}
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if(newCallback === undefined) {
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return !calculations.bottomPassed;
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}
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},
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execute: function(callback, callbackName) {
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var
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calculations = module.get.elementCalculations(),
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screen = module.get.screenCalculations()
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;
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callback = callback || false;
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if(callback) {
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if(settings.continuous) {
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module.debug('Callback being called continuously', callbackName, calculations);
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$.proxy(callback, element)(calculations, screen);
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}
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else if(!module.get.occurred(callbackName)) {
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module.debug('Conditions met', callbackName, calculations);
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$.proxy(callback, element)(calculations, screen);
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}
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}
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module.save.occurred(callbackName);
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},
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remove: {
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occurred: function(callback) {
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if(callback) {
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if(module.cache.occurred[callback] !== undefined && module.cache.occurred[callback] === true) {
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module.debug('Callback can now be called again', callback);
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module.cache.occurred[callback] = false;
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}
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}
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else {
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module.cache.occurred = {};
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}
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}
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},
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save: {
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occurred: function(callback) {
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if(callback) {
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if(module.cache.occurred[callback] === undefined || (module.cache.occurred[callback] !== true)) {
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module.verbose('Saving callback occurred', callback);
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module.cache.occurred[callback] = true;
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}
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}
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},
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scroll: function() {
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module.cache.scroll = $context.scrollTop() + settings.offset;
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},
|
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direction: function() {
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var
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scroll = module.get.scroll(),
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lastScroll = module.get.lastScroll(),
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direction
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;
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if(scroll > lastScroll && lastScroll) {
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direction = 'down';
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}
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else if(scroll < lastScroll && lastScroll) {
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direction = 'up';
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}
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else {
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direction = 'static';
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}
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module.cache.direction = direction;
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return module.cache.direction;
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},
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elementPosition: function() {
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var
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screen = module.get.screenSize()
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;
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module.verbose('Saving element position');
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$.extend(module.cache.element, {
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margin : {
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top : parseInt($module.css('margin-top'), 10),
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bottom : parseInt($module.css('margin-bottom'), 10)
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},
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fits : (element.height < screen.height),
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offset : $module.offset(),
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width : $module.outerWidth(),
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height : $module.outerHeight()
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});
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return module.cache.element;
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},
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elementCalculations: function() {
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var
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screen = module.get.screenCalculations(),
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element = module.get.elementPosition()
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;
|
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// offset
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if(settings.includeMargin) {
|
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$.extend(module.cache.element, {
|
|
top : element.offset.top - element.margin.top,
|
|
bottom : element.offset.top + element.height + element.margin.bottom
|
|
});
|
|
}
|
|
else {
|
|
$.extend(module.cache.element, {
|
|
top : element.offset.top,
|
|
bottom : element.offset.top + element.height
|
|
});
|
|
}
|
|
// visibility
|
|
$.extend(module.cache.element, {
|
|
topVisible : (screen.bottom >= element.top),
|
|
topPassed : (screen.top >= element.top),
|
|
bottomVisible : (screen.bottom >= element.bottom),
|
|
bottomPassed : (screen.top >= element.bottom),
|
|
pixelsPassed : 0,
|
|
percentagePassed : 0
|
|
});
|
|
// meta calculations
|
|
$.extend(module.cache.element, {
|
|
visible : (module.cache.element.topVisible || module.cache.element.bottomVisible),
|
|
passing : (module.cache.element.topPassed && !module.cache.element.bottomPassed),
|
|
hidden : (!module.cache.element.topVisible && !module.cache.element.bottomVisible)
|
|
});
|
|
if(module.cache.element.passing) {
|
|
module.cache.element.pixelsPassed = (screen.top - element.top);
|
|
module.cache.element.percentagePassed = (screen.top - element.top) / element.height;
|
|
}
|
|
module.verbose('Updated element calculations', module.cache.element);
|
|
},
|
|
screenCalculations: function() {
|
|
var
|
|
scroll = $context.scrollTop() + settings.offset
|
|
;
|
|
if(module.cache.scroll === undefined) {
|
|
module.cache.scroll = $context.scrollTop() + settings.offset;
|
|
}
|
|
module.save.direction();
|
|
$.extend(module.cache.screen, {
|
|
top : scroll,
|
|
bottom : scroll + module.cache.screen.height
|
|
});
|
|
return module.cache.screen;
|
|
},
|
|
screenSize: function() {
|
|
module.verbose('Saving window position');
|
|
module.cache.screen = {
|
|
height: $context.height()
|
|
};
|
|
},
|
|
position: function() {
|
|
module.save.screenSize();
|
|
module.save.elementPosition();
|
|
}
|
|
},
|
|
|
|
get: {
|
|
pixelsPassed: function(amount) {
|
|
var
|
|
element = module.get.elementCalculations()
|
|
;
|
|
if(amount.search('%') > -1) {
|
|
return ( element.height * (parseInt(amount, 10) / 100) );
|
|
}
|
|
return parseInt(amount, 10);
|
|
},
|
|
occurred: function(callback) {
|
|
return (module.cache.occurred !== undefined)
|
|
? module.cache.occurred[callback] || false
|
|
: false
|
|
;
|
|
},
|
|
direction: function() {
|
|
if(module.cache.direction === undefined) {
|
|
module.save.direction();
|
|
}
|
|
return module.cache.direction;
|
|
},
|
|
elementPosition: function() {
|
|
if(module.cache.element === undefined) {
|
|
module.save.elementPosition();
|
|
}
|
|
return module.cache.element;
|
|
},
|
|
elementCalculations: function() {
|
|
if(module.cache.element === undefined) {
|
|
module.save.elementCalculations();
|
|
}
|
|
return module.cache.element;
|
|
},
|
|
screenCalculations: function() {
|
|
if(module.cache.screen === undefined) {
|
|
module.save.screenCalculations();
|
|
}
|
|
return module.cache.screen;
|
|
},
|
|
screenSize: function() {
|
|
if(module.cache.screen === undefined) {
|
|
module.save.screenSize();
|
|
}
|
|
return module.cache.screen;
|
|
},
|
|
scroll: function() {
|
|
if(module.cache.scroll === undefined) {
|
|
module.save.scroll();
|
|
}
|
|
return module.cache.scroll;
|
|
},
|
|
lastScroll: function() {
|
|
if(module.cache.screen === undefined) {
|
|
module.debug('First scroll event, no last scroll could be found');
|
|
return false;
|
|
}
|
|
return module.cache.screen.top;
|
|
}
|
|
},
|
|
|
|
setting: function(name, value) {
|
|
if( $.isPlainObject(name) ) {
|
|
$.extend(true, settings, name);
|
|
}
|
|
else if(value !== undefined) {
|
|
settings[name] = value;
|
|
}
|
|
else {
|
|
return settings[name];
|
|
}
|
|
},
|
|
internal: function(name, value) {
|
|
if( $.isPlainObject(name) ) {
|
|
$.extend(true, module, name);
|
|
}
|
|
else if(value !== undefined) {
|
|
module[name] = value;
|
|
}
|
|
else {
|
|
return module[name];
|
|
}
|
|
},
|
|
debug: function() {
|
|
if(settings.debug) {
|
|
if(settings.performance) {
|
|
module.performance.log(arguments);
|
|
}
|
|
else {
|
|
module.debug = Function.prototype.bind.call(console.info, console, settings.name + ':');
|
|
module.debug.apply(console, arguments);
|
|
}
|
|
}
|
|
},
|
|
verbose: function() {
|
|
if(settings.verbose && settings.debug) {
|
|
if(settings.performance) {
|
|
module.performance.log(arguments);
|
|
}
|
|
else {
|
|
module.verbose = Function.prototype.bind.call(console.info, console, settings.name + ':');
|
|
module.verbose.apply(console, arguments);
|
|
}
|
|
}
|
|
},
|
|
error: function() {
|
|
module.error = Function.prototype.bind.call(console.error, console, settings.name + ':');
|
|
module.error.apply(console, arguments);
|
|
},
|
|
performance: {
|
|
log: function(message) {
|
|
var
|
|
currentTime,
|
|
executionTime,
|
|
previousTime
|
|
;
|
|
if(settings.performance) {
|
|
currentTime = new Date().getTime();
|
|
previousTime = time || currentTime;
|
|
executionTime = currentTime - previousTime;
|
|
time = currentTime;
|
|
performance.push({
|
|
'Name' : message[0],
|
|
'Arguments' : [].slice.call(message, 1) || '',
|
|
'Element' : element,
|
|
'Execution Time' : executionTime
|
|
});
|
|
}
|
|
clearTimeout(module.performance.timer);
|
|
module.performance.timer = setTimeout(module.performance.display, 100);
|
|
},
|
|
display: function() {
|
|
var
|
|
title = settings.name + ':',
|
|
totalTime = 0
|
|
;
|
|
time = false;
|
|
clearTimeout(module.performance.timer);
|
|
$.each(performance, function(index, data) {
|
|
totalTime += data['Execution Time'];
|
|
});
|
|
title += ' ' + totalTime + 'ms';
|
|
if(moduleSelector) {
|
|
title += ' \'' + moduleSelector + '\'';
|
|
}
|
|
if( (console.group !== undefined || console.table !== undefined) && performance.length > 0) {
|
|
console.groupCollapsed(title);
|
|
if(console.table) {
|
|
console.table(performance);
|
|
}
|
|
else {
|
|
$.each(performance, function(index, data) {
|
|
console.log(data['Name'] + ': ' + data['Execution Time']+'ms');
|
|
});
|
|
}
|
|
console.groupEnd();
|
|
}
|
|
performance = [];
|
|
}
|
|
},
|
|
invoke: function(query, passedArguments, context) {
|
|
var
|
|
object = instance,
|
|
maxDepth,
|
|
found,
|
|
response
|
|
;
|
|
passedArguments = passedArguments || queryArguments;
|
|
context = element || context;
|
|
if(typeof query == 'string' && object !== undefined) {
|
|
query = query.split(/[\. ]/);
|
|
maxDepth = query.length - 1;
|
|
$.each(query, function(depth, value) {
|
|
var camelCaseValue = (depth != maxDepth)
|
|
? value + query[depth + 1].charAt(0).toUpperCase() + query[depth + 1].slice(1)
|
|
: query
|
|
;
|
|
if( $.isPlainObject( object[camelCaseValue] ) && (depth != maxDepth) ) {
|
|
object = object[camelCaseValue];
|
|
}
|
|
else if( object[camelCaseValue] !== undefined ) {
|
|
found = object[camelCaseValue];
|
|
return false;
|
|
}
|
|
else if( $.isPlainObject( object[value] ) && (depth != maxDepth) ) {
|
|
object = object[value];
|
|
}
|
|
else if( object[value] !== undefined ) {
|
|
found = object[value];
|
|
return false;
|
|
}
|
|
else {
|
|
return false;
|
|
}
|
|
});
|
|
}
|
|
if ( $.isFunction( found ) ) {
|
|
response = found.apply(context, passedArguments);
|
|
}
|
|
else if(found !== undefined) {
|
|
response = found;
|
|
}
|
|
if($.isArray(returnedValue)) {
|
|
returnedValue.push(response);
|
|
}
|
|
else if(returnedValue !== undefined) {
|
|
returnedValue = [returnedValue, response];
|
|
}
|
|
else if(response !== undefined) {
|
|
returnedValue = response;
|
|
}
|
|
return found;
|
|
}
|
|
};
|
|
|
|
if(methodInvoked) {
|
|
if(instance === undefined) {
|
|
module.initialize();
|
|
}
|
|
module.invoke(query);
|
|
}
|
|
else {
|
|
if(instance !== undefined) {
|
|
module.destroy();
|
|
}
|
|
module.initialize();
|
|
}
|
|
})
|
|
;
|
|
|
|
return (returnedValue !== undefined)
|
|
? returnedValue
|
|
: this
|
|
;
|
|
};
|
|
|
|
$.fn.visibility.settings = {
|
|
|
|
name : 'Visibility',
|
|
namespace : 'visibility',
|
|
|
|
className: {
|
|
fixed: 'fixed'
|
|
},
|
|
|
|
debug : false,
|
|
verbose : false,
|
|
performance : true,
|
|
|
|
offset : 0,
|
|
includeMargin : false,
|
|
|
|
context : window,
|
|
|
|
// visibility check delay in ms (defaults to animationFrame)
|
|
throttle : false,
|
|
|
|
// special visibility type (image, fixed)
|
|
type : false,
|
|
|
|
// image only settings
|
|
transition : false,
|
|
duration : 500,
|
|
|
|
// array of callbacks for percentage
|
|
onPassed : {},
|
|
|
|
// standard callbacks
|
|
onPassing : false,
|
|
onTopVisible : false,
|
|
onBottomVisible : false,
|
|
onTopPassed : false,
|
|
onBottomPassed : false,
|
|
|
|
// reverse callbacks
|
|
onPassingReverse : false,
|
|
onTopVisibleReverse : false,
|
|
onBottomVisibleReverse : false,
|
|
onTopPassedReverse : false,
|
|
onBottomPassedReverse : false,
|
|
|
|
once : true,
|
|
continuous : false,
|
|
|
|
// utility callbacks
|
|
onRefresh : function(){},
|
|
onScroll : function(){},
|
|
|
|
error : {
|
|
method : 'The method you called is not defined.'
|
|
}
|
|
|
|
};
|
|
|
|
})( jQuery, window , document );
|