1577 lines
47 KiB
JavaScript
1577 lines
47 KiB
JavaScript
/*
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* Backstretch
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* http://srobbin.com/jquery-plugins/backstretch/
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*
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* Copyright (c) 2013 Scott Robbin
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* Licensed under the MIT license.
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*/
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;(function ($, window, undefined) {
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'use strict';
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/** @const */
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var YOUTUBE_REGEXP = /^.*(youtu\.be\/|youtube\.com\/v\/|youtube\.com\/embed\/|youtube\.com\/watch\?v=|youtube\.com\/watch\?.*\&v=)([^#\&\?]*).*/i;
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/* PLUGIN DEFINITION
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* ========================= */
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$.fn.backstretch = function (images, options) {
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var args = arguments;
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/*
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* Scroll the page one pixel to get the right window height on iOS
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* Pretty harmless for everyone else
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*/
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if ($(window).scrollTop() === 0 ) {
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window.scrollTo(0, 0);
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}
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var returnValues;
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this.each(function (eachIndex) {
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var $this = $(this)
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, obj = $this.data('backstretch');
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// Do we already have an instance attached to this element?
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if (obj) {
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// Is this a method they're trying to execute?
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if (typeof args[0] === 'string' &&
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typeof obj[args[0]] === 'function') {
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// Call the method
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var returnValue = obj[args[0]].apply(obj, Array.prototype.slice.call(args, 1));
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if (returnValue === obj) { // If a method is chaining
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returnValue = undefined;
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}
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if (returnValue !== undefined) {
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returnValues = returnValues || [];
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returnValues[eachIndex] = returnValue;
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}
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return; // Nothing further to do
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}
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// Merge the old options with the new
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options = $.extend(obj.options, options);
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// Remove the old instance
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if ( obj.hasOwnProperty('destroy') ) {
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obj.destroy(true);
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}
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}
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// We need at least one image
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if (!images || (images && images.length === 0)) {
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var cssBackgroundImage = $this.css('background-image');
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if (cssBackgroundImage && cssBackgroundImage !== 'none') {
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images = [ { url: $this.css('backgroundImage').replace(/url\(|\)|"|'/g,"") } ];
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} else {
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$.error('No images were supplied for Backstretch, or element must have a CSS-defined background image.');
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}
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}
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obj = new Backstretch(this, images, options || {});
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$this.data('backstretch', obj);
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});
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return returnValues ? returnValues.length === 1 ? returnValues[0] : returnValues : this;
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};
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// If no element is supplied, we'll attach to body
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$.backstretch = function (images, options) {
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// Return the instance
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return $('body')
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.backstretch(images, options)
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.data('backstretch');
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};
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// Custom selector
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$.expr[':'].backstretch = function(elem) {
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return $(elem).data('backstretch') !== undefined;
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};
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/* DEFAULTS
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* ========================= */
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$.fn.backstretch.defaults = {
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duration: 5000 // Amount of time in between slides (if slideshow)
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, transition: 'fade' // Type of transition between slides
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, transitionDuration: 0 // Duration of transition between slides
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, animateFirst: true // Animate the transition of first image of slideshow in?
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, alignX: 0.5 // The x-alignment for the image, can be 'left'|'center'|'right' or any number between 0.0 and 1.0
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, alignY: 0.5 // The y-alignment for the image, can be 'top'|'center'|'bottom' or any number between 0.0 and 1.0
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, paused: false // Whether the images should slide after given duration
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, start: 0 // Index of the first image to show
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, preload: 2 // How many images preload at a time?
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, preloadSize: 1 // How many images can we preload in parallel?
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, resolutionRefreshRate: 2500 // How long to wait before switching resolution?
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, resolutionChangeRatioThreshold: 0.1 // How much a change should it be before switching resolution?
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};
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/* STYLES
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*
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* Baked-in styles that we'll apply to our elements.
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* In an effort to keep the plugin simple, these are not exposed as options.
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* That said, anyone can override these in their own stylesheet.
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* ========================= */
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var styles = {
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wrap: {
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left: 0
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, top: 0
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, overflow: 'hidden'
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, margin: 0
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, padding: 0
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, height: '100%'
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, width: '100%'
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, zIndex: -999999
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}
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, itemWrapper: {
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position: 'absolute'
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, display: 'none'
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, margin: 0
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, padding: 0
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, border: 'none'
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, width: '100%'
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, height: '100%'
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, zIndex: -999999
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}
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, item: {
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position: 'absolute'
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, margin: 0
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, padding: 0
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, border: 'none'
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, width: '100%'
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, height: '100%'
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, maxWidth: 'none'
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}
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};
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/* Given an array of different options for an image,
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* choose the optimal image for the container size.
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*
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* Given an image template (a string with {{ width }} and/or
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* {{height}} inside) and a container object, returns the
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* image url with the exact values for the size of that
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* container.
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*
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* Returns an array of urls optimized for the specified resolution.
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*
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*/
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var optimalSizeImages = (function () {
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/* Sorts the array of image sizes based on width */
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var widthInsertSort = function (arr) {
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for (var i = 1; i < arr.length; i++) {
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var tmp = arr[i],
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j = i;
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while (arr[j - 1] && parseInt(arr[j - 1].width, 10) > parseInt(tmp.width, 10)) {
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arr[j] = arr[j - 1];
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--j;
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}
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arr[j] = tmp;
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}
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return arr;
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};
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/* Given an array of various sizes of the same image and a container width,
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* return the best image.
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*/
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var selectBest = function (containerWidth, containerHeight, imageSizes) {
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var devicePixelRatio = window.devicePixelRatio || 1;
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var deviceOrientation = getDeviceOrientation();
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var windowOrientation = getWindowOrientation();
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var wrapperOrientation = (containerHeight > containerWidth) ?
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'portrait' :
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(containerWidth > containerHeight ? 'landscape' : 'square');
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var lastAllowedImage = 0;
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var testWidth;
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for (var j = 0, image; j < imageSizes.length; j++) {
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image = imageSizes[j];
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// In case a new image was pushed in, process it:
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if (typeof image === 'string') {
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image = imageSizes[j] = { url: image };
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}
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if (image.pixelRatio && image.pixelRatio !== 'auto' && parseFloat(image.pixelRatio) !== devicePixelRatio) {
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// We disallowed choosing this image for current device pixel ratio,
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// So skip this one.
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continue;
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}
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if (image.deviceOrientation && image.deviceOrientation !== deviceOrientation) {
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// We disallowed choosing this image for current device orientation,
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// So skip this one.
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continue;
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}
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if (image.windowOrientation && image.windowOrientation !== deviceOrientation) {
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// We disallowed choosing this image for current window orientation,
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// So skip this one.
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continue;
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}
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if (image.orientation && image.orientation !== wrapperOrientation) {
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// We disallowed choosing this image for current element's orientation,
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// So skip this one.
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continue;
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}
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// Mark this one as the last one we investigated
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// which does not violate device pixel ratio rules.
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// We may choose this one later if there's no match.
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lastAllowedImage = j;
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// For most images, we match the specified width against element width,
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// And enforcing a limit depending on the "pixelRatio" property if specified.
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// But if a pixelRatio="auto", then we consider the width as the physical width of the image,
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// And match it while considering the device's pixel ratio.
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testWidth = containerWidth;
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if (image.pixelRatio === 'auto') {
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containerWidth *= devicePixelRatio;
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}
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// Stop when the width of the image is larger or equal to the container width
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if (image.width >= testWidth) {
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break;
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}
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}
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// Use the image located at where we stopped
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return imageSizes[Math.min(j, lastAllowedImage)];
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};
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var replaceTagsInUrl = function (url, templateReplacer) {
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if (typeof url === 'string') {
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url = url.replace(/{{(width|height)}}/g, templateReplacer);
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} else if (url instanceof Array) {
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for (var i = 0; i < url.length; i++) {
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if (url[i].src) {
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url[i].src = replaceTagsInUrl(url[i].src, templateReplacer);
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} else {
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url[i] = replaceTagsInUrl(url[i], templateReplacer);
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}
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}
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}
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return url;
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};
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return function ($container, images) {
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var containerWidth = $container.width(),
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containerHeight = $container.height();
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var chosenImages = [];
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var templateReplacer = function (match, key) {
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if (key === 'width') {
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return containerWidth;
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}
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if (key === 'height') {
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return containerHeight;
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}
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return match;
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};
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for (var i = 0; i < images.length; i++) {
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if ($.isArray(images[i])) {
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images[i] = widthInsertSort(images[i]);
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var chosen = selectBest(containerWidth, containerHeight, images[i]);
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chosenImages.push(chosen);
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} else {
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// In case a new image was pushed in, process it:
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if (typeof images[i] === 'string') {
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images[i] = { url: images[i] };
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}
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var item = $.extend({}, images[i]);
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item.url = replaceTagsInUrl(item.url, templateReplacer);
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chosenImages.push(item);
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}
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}
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return chosenImages;
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};
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})();
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var isVideoSource = function (source) {
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return YOUTUBE_REGEXP.test(source.url) || source.isVideo;
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};
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/* Preload images */
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var preload = (function (sources, startAt, count, batchSize, callback) {
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// Plugin cache
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var cache = [];
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// Wrapper for cache
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var caching = function(image){
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for (var i = 0; i < cache.length; i++) {
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if (cache[i].src === image.src) {
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return cache[i];
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}
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}
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cache.push(image);
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return image;
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};
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// Execute callback
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var exec = function(sources, callback, last){
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if (typeof callback === 'function') {
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callback.call(sources, last);
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}
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};
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// Closure to hide cache
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return function preload (sources, startAt, count, batchSize, callback){
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// Check input data
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if (typeof sources === 'undefined') {
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return;
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}
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if (!$.isArray(sources)) {
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sources = [sources];
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}
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if (arguments.length < 5 && typeof arguments[arguments.length - 1] === 'function') {
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callback = arguments[arguments.length - 1];
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}
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startAt = (typeof startAt === 'function' || !startAt) ? 0 : startAt;
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count = (typeof count === 'function' || !count || count < 0) ? sources.length : Math.min(count, sources.length);
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batchSize = (typeof batchSize === 'function' || !batchSize) ? 1 : batchSize;
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if (startAt >= sources.length) {
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startAt = 0;
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count = 0;
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}
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if (batchSize < 0) {
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batchSize = count;
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}
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batchSize = Math.min(batchSize, count);
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var next = sources.slice(startAt + batchSize, count - batchSize);
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sources = sources.slice(startAt, batchSize);
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count = sources.length;
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// If sources array is empty
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if (!count) {
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exec(sources, callback, true);
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return;
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}
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// Image loading callback
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var countLoaded = 0;
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var loaded = function() {
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countLoaded++;
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if (countLoaded !== count) {
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return;
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}
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exec(sources, callback, !next);
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preload(next, 0, 0, batchSize, callback);
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};
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// Loop sources to preload
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var image;
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for (var i = 0; i < sources.length; i++) {
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if (isVideoSource(sources[i])) {
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// Do not preload videos. There are issues with that.
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// First - we need to keep an instance of the preloaded and use that exactly, not a copy.
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// Second - there are memory issues.
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// If there will be a requirement from users - I'll try to implement this.
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continue;
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} else {
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image = new Image();
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image.src = sources[i].url;
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image = caching(image);
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if (image.complete) {
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loaded();
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} else {
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$(image).on('load error', loaded);
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}
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}
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}
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};
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})();
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/* Process images array */
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var processImagesArray = function (images) {
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var processed = [];
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for (var i = 0; i < images.length; i++) {
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if (typeof images[i] === 'string') {
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processed.push({ url: images[i] });
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}
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else if ($.isArray(images[i])) {
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processed.push(processImagesArray(images[i]));
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}
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else {
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processed.push(processOptions(images[i]));
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}
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}
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return processed;
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};
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/* Process options */
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var processOptions = function (options, required) {
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// Convert old options
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// centeredX/centeredY are deprecated
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if (options.centeredX || options.centeredY) {
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if (window.console && window.console.log) {
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window.console.log('jquery.backstretch: `centeredX`/`centeredY` is deprecated, please use `alignX`/`alignY`');
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}
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if (options.centeredX) {
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options.alignX = 0.5;
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}
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if (options.centeredY) {
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options.alignY = 0.5;
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}
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}
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// Deprecated spec
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if (options.speed !== undefined) {
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if (window.console && window.console.log) {
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window.console.log('jquery.backstretch: `speed` is deprecated, please use `transitionDuration`');
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}
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options.transitionDuration = options.speed;
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options.transition = 'fade';
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}
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// Typo
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if (options.resolutionChangeRatioTreshold !== undefined) {
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window.console.log('jquery.backstretch: `treshold` is a typo!');
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options.resolutionChangeRatioThreshold = options.resolutionChangeRatioTreshold;
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}
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// Current spec that needs processing
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if (options.fadeFirst !== undefined) {
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options.animateFirst = options.fadeFirst;
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}
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if (options.fade !== undefined) {
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options.transitionDuration = options.fade;
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options.transition = 'fade';
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}
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if (options.scale) {
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options.scale = validScale(options.scale);
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}
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return processAlignOptions(options);
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};
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/* Process align options */
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var processAlignOptions = function (options, required) {
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if (options.alignX === 'left') {
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options.alignX = 0.0;
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}
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else if (options.alignX === 'center') {
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options.alignX = 0.5;
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}
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else if (options.alignX === 'right') {
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options.alignX = 1.0;
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}
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else {
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if (options.alignX !== undefined || required) {
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options.alignX = parseFloat(options.alignX);
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if (isNaN(options.alignX)) {
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options.alignX = 0.5;
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}
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}
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}
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if (options.alignY === 'top') {
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options.alignY = 0.0;
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}
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else if (options.alignY === 'center') {
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options.alignY = 0.5;
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}
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else if (options.alignY === 'bottom') {
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options.alignY = 1.0;
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}
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else {
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if (options.alignX !== undefined || required) {
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options.alignY = parseFloat(options.alignY);
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if (isNaN(options.alignY)) {
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options.alignY = 0.5;
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}
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}
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}
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return options;
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};
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var SUPPORTED_SCALE_OPTIONS = {
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'cover': 'cover',
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'fit': 'fit',
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'fit-smaller': 'fit-smaller',
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'fill': 'fill'
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};
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function validScale(scale) {
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if (!SUPPORTED_SCALE_OPTIONS.hasOwnProperty(scale)) {
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return 'cover';
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}
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return scale;
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}
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|
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/* CLASS DEFINITION
|
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* ========================= */
|
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var Backstretch = function (container, images, options) {
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this.options = $.extend({}, $.fn.backstretch.defaults, options || {});
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this.firstShow = true;
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// Process options
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processOptions(this.options, true);
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|
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/* In its simplest form, we allow Backstretch to be called on an image path.
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* e.g. $.backstretch('/path/to/image.jpg')
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* So, we need to turn this back into an array.
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*/
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this.images = processImagesArray($.isArray(images) ? images : [images]);
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/**
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* Paused-Option
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*/
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if (this.options.paused) {
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this.paused = true;
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}
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|
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/**
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* Start-Option (Index)
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*/
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if (this.options.start >= this.images.length)
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{
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this.options.start = this.images.length - 1;
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}
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if (this.options.start < 0)
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{
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this.options.start = 0;
|
|
}
|
|
|
|
// Convenience reference to know if the container is body.
|
|
this.isBody = container === document.body;
|
|
|
|
/* We're keeping track of a few different elements
|
|
*
|
|
* Container: the element that Backstretch was called on.
|
|
* Wrap: a DIV that we place the image into, so we can hide the overflow.
|
|
* Root: Convenience reference to help calculate the correct height.
|
|
*/
|
|
var $window = $(window);
|
|
this.$container = $(container);
|
|
this.$root = this.isBody ? supportsFixedPosition ? $window : $(document) : this.$container;
|
|
|
|
this.originalImages = this.images;
|
|
this.images = optimalSizeImages(
|
|
this.options.alwaysTestWindowResolution ? $window : this.$root,
|
|
this.originalImages);
|
|
|
|
/**
|
|
* Pre-Loading.
|
|
* This is the first image, so we will preload a minimum of 1 images.
|
|
*/
|
|
preload(this.images, this.options.start || 0, this.options.preload || 1);
|
|
|
|
// Don't create a new wrap if one already exists (from a previous instance of Backstretch)
|
|
var $existing = this.$container.children(".backstretch").first();
|
|
this.$wrap = $existing.length ? $existing :
|
|
$('<div class="backstretch"></div>')
|
|
.css(this.options.bypassCss ? {} : styles.wrap)
|
|
.appendTo(this.$container);
|
|
|
|
if (!this.options.bypassCss) {
|
|
|
|
// Non-body elements need some style adjustments
|
|
if (!this.isBody) {
|
|
// If the container is statically positioned, we need to make it relative,
|
|
// and if no zIndex is defined, we should set it to zero.
|
|
var position = this.$container.css('position')
|
|
, zIndex = this.$container.css('zIndex');
|
|
|
|
this.$container.css({
|
|
position: position === 'static' ? 'relative' : position
|
|
, zIndex: zIndex === 'auto' ? 0 : zIndex
|
|
});
|
|
|
|
// Needs a higher z-index
|
|
this.$wrap.css({zIndex: -999998});
|
|
}
|
|
|
|
// Fixed or absolute positioning?
|
|
this.$wrap.css({
|
|
position: this.isBody && supportsFixedPosition ? 'fixed' : 'absolute'
|
|
});
|
|
|
|
}
|
|
|
|
// Set the first image
|
|
this.index = this.options.start;
|
|
this.show(this.index);
|
|
|
|
// Listen for resize
|
|
$window.on('resize.backstretch', $.proxy(this.resize, this))
|
|
.on('orientationchange.backstretch', $.proxy(function () {
|
|
// Need to do this in order to get the right window height
|
|
if (this.isBody && window.pageYOffset === 0) {
|
|
window.scrollTo(0, 1);
|
|
this.resize();
|
|
}
|
|
}, this));
|
|
};
|
|
|
|
var performTransition = function (options) {
|
|
|
|
var transition = options.transition || 'fade';
|
|
|
|
// Look for multiple options
|
|
if (typeof transition === 'string' && transition.indexOf('|') > -1) {
|
|
transition = transition.split('|');
|
|
}
|
|
|
|
if (transition instanceof Array) {
|
|
transition = transition[Math.round(Math.random() * (transition.length - 1))];
|
|
}
|
|
|
|
var $new = options['new'];
|
|
var $old = options['old'] ? options['old'] : $([]);
|
|
|
|
switch (transition.toString().toLowerCase()) {
|
|
|
|
default:
|
|
case 'fade':
|
|
$new.fadeIn({
|
|
duration: options.duration,
|
|
complete: options.complete,
|
|
easing: options.easing || undefined
|
|
});
|
|
break;
|
|
|
|
case 'fadeinout':
|
|
case 'fade_in_out':
|
|
|
|
var fadeInNew = function () {
|
|
$new.fadeIn({
|
|
duration: options.duration / 2,
|
|
complete: options.complete,
|
|
easing: options.easing || undefined
|
|
});
|
|
};
|
|
|
|
if ($old.length) {
|
|
$old.fadeOut({
|
|
duration: options.duration / 2,
|
|
complete: fadeInNew,
|
|
easing: options.easing || undefined
|
|
});
|
|
} else {
|
|
fadeInNew();
|
|
}
|
|
|
|
break;
|
|
|
|
case 'pushleft':
|
|
case 'push_left':
|
|
case 'pushright':
|
|
case 'push_right':
|
|
case 'pushup':
|
|
case 'push_up':
|
|
case 'pushdown':
|
|
case 'push_down':
|
|
case 'coverleft':
|
|
case 'cover_left':
|
|
case 'coverright':
|
|
case 'cover_right':
|
|
case 'coverup':
|
|
case 'cover_up':
|
|
case 'coverdown':
|
|
case 'cover_down':
|
|
|
|
var transitionParts = transition.match(/^(cover|push)_?(.*)$/);
|
|
|
|
var animProp = transitionParts[2] === 'left' ? 'right' :
|
|
transitionParts[2] === 'right' ? 'left' :
|
|
transitionParts[2] === 'down' ? 'top' :
|
|
transitionParts[2] === 'up' ? 'bottom' :
|
|
'right';
|
|
|
|
var newCssStart = {
|
|
'display': ''
|
|
}, newCssAnim = {};
|
|
newCssStart[animProp] = '-100%';
|
|
newCssAnim[animProp] = 0;
|
|
|
|
$new
|
|
.css(newCssStart)
|
|
.animate(newCssAnim, {
|
|
duration: options.duration,
|
|
complete: function () {
|
|
$new.css(animProp, '');
|
|
options.complete.apply(this, arguments);
|
|
},
|
|
easing: options.easing || undefined
|
|
});
|
|
|
|
if (transitionParts[1] === 'push' && $old.length) {
|
|
var oldCssAnim = {};
|
|
oldCssAnim[animProp] = '100%';
|
|
|
|
$old
|
|
.animate(oldCssAnim, {
|
|
duration: options.duration,
|
|
complete: function () {
|
|
$old.css('display', 'none');
|
|
},
|
|
easing: options.easing || undefined
|
|
});
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
};
|
|
|
|
/* PUBLIC METHODS
|
|
* ========================= */
|
|
Backstretch.prototype = {
|
|
|
|
resize: function () {
|
|
try {
|
|
|
|
// Check for a better suited image after the resize
|
|
var $resTest = this.options.alwaysTestWindowResolution ? $(window) : this.$root;
|
|
var newContainerWidth = $resTest.width();
|
|
var newContainerHeight = $resTest.height();
|
|
var changeRatioW = newContainerWidth / (this._lastResizeContainerWidth || 0);
|
|
var changeRatioH = newContainerHeight / (this._lastResizeContainerHeight || 0);
|
|
var resolutionChangeRatioThreshold = this.options.resolutionChangeRatioThreshold || 0.0;
|
|
|
|
// check for big changes in container size
|
|
if ((newContainerWidth !== this._lastResizeContainerWidth ||
|
|
newContainerHeight !== this._lastResizeContainerHeight) &&
|
|
((Math.abs(changeRatioW - 1) >= resolutionChangeRatioThreshold || isNaN(changeRatioW)) ||
|
|
(Math.abs(changeRatioH - 1) >= resolutionChangeRatioThreshold || isNaN(changeRatioH)))) {
|
|
|
|
this._lastResizeContainerWidth = newContainerWidth;
|
|
this._lastResizeContainerHeight = newContainerHeight;
|
|
|
|
// Big change: rebuild the entire images array
|
|
this.images = optimalSizeImages($resTest, this.originalImages);
|
|
|
|
// Preload them (they will be automatically inserted on the next cycle)
|
|
if (this.options.preload) {
|
|
preload(this.images, (this.index + 1) % this.images.length, this.options.preload);
|
|
}
|
|
|
|
// In case there is no cycle and the new source is different than the current
|
|
if (this.images.length === 1 &&
|
|
this._currentImage.url !== this.images[0].url) {
|
|
|
|
// Wait a little an update the image being showed
|
|
var that = this;
|
|
clearTimeout(that._selectAnotherResolutionTimeout);
|
|
that._selectAnotherResolutionTimeout = setTimeout(function () {
|
|
that.show(0);
|
|
}, this.options.resolutionRefreshRate);
|
|
}
|
|
}
|
|
|
|
var bgCSS = {left: 0, top: 0, right: 'auto', bottom: 'auto'}
|
|
|
|
, boxWidth = this.isBody ? this.$root.width() : this.$root.innerWidth()
|
|
, boxHeight = this.isBody ? ( window.innerHeight ? window.innerHeight : this.$root.height() ) : this.$root.innerHeight()
|
|
|
|
, naturalWidth = this.$itemWrapper.data('width')
|
|
, naturalHeight = this.$itemWrapper.data('height')
|
|
|
|
, ratio = (naturalWidth / naturalHeight) || 1
|
|
|
|
, alignX = this._currentImage.alignX === undefined ? this.options.alignX : this._currentImage.alignX
|
|
, alignY = this._currentImage.alignY === undefined ? this.options.alignY : this._currentImage.alignY
|
|
, scale = validScale(this._currentImage.scale || this.options.scale);
|
|
|
|
var width, height;
|
|
|
|
if (scale === 'fit' || scale === 'fit-smaller') {
|
|
width = naturalWidth;
|
|
height = naturalHeight;
|
|
|
|
if (width > boxWidth ||
|
|
height > boxHeight ||
|
|
scale === 'fit-smaller') {
|
|
var boxRatio = boxWidth / boxHeight;
|
|
if (boxRatio > ratio) {
|
|
width = Math.floor(boxHeight * ratio);
|
|
height = boxHeight;
|
|
} else if (boxRatio < ratio) {
|
|
width = boxWidth;
|
|
height = Math.floor(boxWidth / ratio);
|
|
} else {
|
|
width = boxWidth;
|
|
height = boxHeight;
|
|
}
|
|
}
|
|
} else if (scale === 'fill') {
|
|
width = boxWidth;
|
|
height = boxHeight;
|
|
} else { // 'cover'
|
|
width = Math.max(boxHeight * ratio, boxWidth);
|
|
height = Math.max(width / ratio, boxHeight);
|
|
}
|
|
|
|
// Make adjustments based on image ratio
|
|
bgCSS.top = -(height - boxHeight) * alignY;
|
|
bgCSS.left = -(width - boxWidth) * alignX;
|
|
bgCSS.width = width;
|
|
bgCSS.height = height;
|
|
|
|
if (!this.options.bypassCss) {
|
|
|
|
this.$wrap
|
|
.css({width: boxWidth, height: boxHeight})
|
|
.find('>.backstretch-item').not('.deleteable')
|
|
.each(function () {
|
|
var $wrapper = $(this);
|
|
$wrapper.find('img,video,iframe')
|
|
.css(bgCSS);
|
|
});
|
|
}
|
|
|
|
var evt = $.Event('backstretch.resize', {
|
|
relatedTarget: this.$container[0]
|
|
});
|
|
this.$container.trigger(evt, this);
|
|
|
|
} catch(err) {
|
|
// IE7 seems to trigger resize before the image is loaded.
|
|
// This try/catch block is a hack to let it fail gracefully.
|
|
}
|
|
|
|
return this;
|
|
}
|
|
|
|
// Show the slide at a certain position
|
|
, show: function (newIndex, overrideOptions) {
|
|
|
|
// Validate index
|
|
if (Math.abs(newIndex) > this.images.length - 1) {
|
|
return;
|
|
}
|
|
|
|
// Vars
|
|
var that = this
|
|
, $oldItemWrapper = that.$wrap.find('>.backstretch-item').addClass('deleteable')
|
|
, oldVideoWrapper = that.videoWrapper
|
|
, evtOptions = { relatedTarget: that.$container[0] };
|
|
|
|
// Trigger the "before" event
|
|
that.$container.trigger($.Event('backstretch.before', evtOptions), [that, newIndex]);
|
|
|
|
// Set the new frame index
|
|
this.index = newIndex;
|
|
var selectedImage = that.images[newIndex];
|
|
|
|
// Pause the slideshow
|
|
clearTimeout(that._cycleTimeout);
|
|
|
|
// New image
|
|
|
|
delete that.videoWrapper; // Current item may not be a video
|
|
|
|
var isVideo = isVideoSource(selectedImage);
|
|
if (isVideo) {
|
|
that.videoWrapper = new VideoWrapper(selectedImage);
|
|
that.$item = that.videoWrapper.$video.css('pointer-events', 'none');
|
|
} else {
|
|
that.$item = $('<img />');
|
|
}
|
|
|
|
that.$itemWrapper = $('<div class="backstretch-item">')
|
|
.append(that.$item);
|
|
|
|
if (this.options.bypassCss) {
|
|
that.$itemWrapper.css({
|
|
'display': 'none'
|
|
});
|
|
} else {
|
|
that.$itemWrapper.css(styles.itemWrapper);
|
|
that.$item.css(styles.item);
|
|
}
|
|
|
|
that.$item.bind(isVideo ? 'canplay' : 'load', function (e) {
|
|
var $this = $(this)
|
|
, $wrapper = $this.parent()
|
|
, options = $wrapper.data('options');
|
|
|
|
if (overrideOptions) {
|
|
options = $.extend({}, options, overrideOptions);
|
|
}
|
|
|
|
var imgWidth = this.naturalWidth || this.videoWidth || this.width
|
|
, imgHeight = this.naturalHeight || this.videoHeight || this.height;
|
|
|
|
// Save the natural dimensions
|
|
$wrapper
|
|
.data('width', imgWidth)
|
|
.data('height', imgHeight);
|
|
|
|
var getOption = function (opt) {
|
|
return options[opt] !== undefined ?
|
|
options[opt] :
|
|
that.options[opt];
|
|
};
|
|
|
|
var transition = getOption('transition');
|
|
var transitionEasing = getOption('transitionEasing');
|
|
var transitionDuration = getOption('transitionDuration');
|
|
|
|
// Show the image, then delete the old one
|
|
var bringInNextImage = function () {
|
|
|
|
if (oldVideoWrapper) {
|
|
oldVideoWrapper.stop();
|
|
oldVideoWrapper.destroy();
|
|
}
|
|
|
|
$oldItemWrapper.remove();
|
|
|
|
// Resume the slideshow
|
|
if (!that.paused && that.images.length > 1) {
|
|
that.cycle();
|
|
}
|
|
|
|
// Now we can clear the background on the element, to spare memory
|
|
if (!that.options.bypassCss && !that.isBody) {
|
|
that.$container.css('background-image', 'none');
|
|
}
|
|
|
|
// Trigger the "after" and "show" events
|
|
// "show" is being deprecated
|
|
$(['after', 'show']).each(function () {
|
|
that.$container.trigger($.Event('backstretch.' + this, evtOptions), [that, newIndex]);
|
|
});
|
|
|
|
if (isVideo) {
|
|
that.videoWrapper.play();
|
|
}
|
|
};
|
|
|
|
if ((that.firstShow && !that.options.animateFirst) || !transitionDuration || !transition) {
|
|
// Avoid transition on first show or if there's no transitionDuration value
|
|
$wrapper.show();
|
|
bringInNextImage();
|
|
} else {
|
|
|
|
performTransition({
|
|
'new': $wrapper,
|
|
old: $oldItemWrapper,
|
|
transition: transition,
|
|
duration: transitionDuration,
|
|
easing: transitionEasing,
|
|
complete: bringInNextImage
|
|
});
|
|
|
|
}
|
|
|
|
that.firstShow = false;
|
|
|
|
// Resize
|
|
that.resize();
|
|
});
|
|
|
|
that.$itemWrapper.appendTo(that.$wrap);
|
|
|
|
that.$item.attr('alt', selectedImage.alt || '');
|
|
that.$itemWrapper.data('options', selectedImage);
|
|
|
|
if (!isVideo) {
|
|
that.$item.attr('src', selectedImage.url);
|
|
}
|
|
|
|
that._currentImage = selectedImage;
|
|
|
|
return that;
|
|
}
|
|
|
|
, current: function () {
|
|
return this.index;
|
|
}
|
|
|
|
, next: function () {
|
|
var args = Array.prototype.slice.call(arguments, 0);
|
|
args.unshift(this.index < this.images.length - 1 ? this.index + 1 : 0);
|
|
return this.show.apply(this, args);
|
|
}
|
|
|
|
, prev: function () {
|
|
var args = Array.prototype.slice.call(arguments, 0);
|
|
args.unshift(this.index === 0 ? this.images.length - 1 : this.index - 1);
|
|
return this.show.apply(this, args);
|
|
}
|
|
|
|
, pause: function () {
|
|
// Pause the slideshow
|
|
this.paused = true;
|
|
|
|
if (this.videoWrapper) {
|
|
this.videoWrapper.pause();
|
|
}
|
|
|
|
return this;
|
|
}
|
|
|
|
, resume: function () {
|
|
// Resume the slideshow
|
|
this.paused = false;
|
|
|
|
if (this.videoWrapper) {
|
|
this.videoWrapper.play();
|
|
}
|
|
|
|
this.cycle();
|
|
return this;
|
|
}
|
|
|
|
, cycle: function () {
|
|
// Start/resume the slideshow
|
|
if(this.images.length > 1) {
|
|
// Clear the timeout, just in case
|
|
clearTimeout(this._cycleTimeout);
|
|
|
|
var duration = (this._currentImage && this._currentImage.duration) || this.options.duration;
|
|
var isVideo = isVideoSource(this._currentImage);
|
|
|
|
var callNext = function () {
|
|
this.$item.off('.cycle');
|
|
|
|
// Check for paused slideshow
|
|
if (!this.paused) {
|
|
this.next();
|
|
}
|
|
};
|
|
|
|
// Special video handling
|
|
if (isVideo) {
|
|
|
|
// Leave video at last frame
|
|
if (!this._currentImage.loop) {
|
|
var lastFrameTimeout = 0;
|
|
|
|
this.$item
|
|
.on('playing.cycle', function () {
|
|
var player = $(this).data('player');
|
|
|
|
clearTimeout(lastFrameTimeout);
|
|
lastFrameTimeout = setTimeout(function () {
|
|
player.pause();
|
|
player.$video.trigger('ended');
|
|
}, (player.getDuration() - player.getCurrentTime()) * 1000);
|
|
})
|
|
.on('ended.cycle', function () {
|
|
clearTimeout(lastFrameTimeout);
|
|
});
|
|
}
|
|
|
|
// On error go to next
|
|
this.$item.on('error.cycle initerror.cycle', $.proxy(callNext, this));
|
|
}
|
|
|
|
if (isVideo && !this._currentImage.duration) {
|
|
// It's a video - playing until end
|
|
this.$item.on('ended.cycle', $.proxy(callNext, this));
|
|
|
|
} else {
|
|
// Cycling according to specified duration
|
|
this._cycleTimeout = setTimeout($.proxy(callNext, this), duration);
|
|
}
|
|
|
|
}
|
|
return this;
|
|
}
|
|
|
|
, destroy: function (preserveBackground) {
|
|
// Stop the resize events
|
|
$(window).off('resize.backstretch orientationchange.backstretch');
|
|
|
|
// Stop any videos
|
|
if (this.videoWrapper) {
|
|
this.videoWrapper.destroy();
|
|
}
|
|
|
|
// Clear the timeout
|
|
clearTimeout(this._cycleTimeout);
|
|
|
|
// Remove Backstretch
|
|
if(!preserveBackground) {
|
|
this.$wrap.remove();
|
|
}
|
|
this.$container.removeData('backstretch');
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Video Abstraction Layer
|
|
*
|
|
* Static methods:
|
|
* > VideoWrapper.loadYoutubeAPI() -> Call in order to load the Youtube API.
|
|
* An 'youtube_api_load' event will be triggered on $(window) when the API is loaded.
|
|
*
|
|
* Generic:
|
|
* > player.type -> type of the video
|
|
* > player.video / player.$video -> contains the element holding the video
|
|
* > player.play() -> plays the video
|
|
* > player.pause() -> pauses the video
|
|
* > player.setCurrentTime(position) -> seeks to a position by seconds
|
|
*
|
|
* Youtube:
|
|
* > player.ytId will contain the youtube ID if the source is a youtube url
|
|
* > player.ytReady is a flag telling whether the youtube source is ready for playback
|
|
* */
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|
|
|
var VideoWrapper = function () { this.init.apply(this, arguments); };
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|
|
/**
|
|
* @param {Object} options
|
|
* @param {String|Array<String>|Array<{{src: String, type: String?}}>} options.url
|
|
* @param {Boolean} options.loop=false
|
|
* @param {Boolean?} options.mute=true
|
|
* @param {String?} options.poster
|
|
* loop, mute, poster
|
|
*/
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|
VideoWrapper.prototype.init = function (options) {
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|
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|
var that = this;
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|
var $video;
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|
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|
var setVideoElement = function () {
|
|
that.$video = $video;
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|
that.video = $video[0];
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|
};
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|
// Determine video type
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|
|
|
var videoType = 'video';
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|
|
|
if (!(options.url instanceof Array) &&
|
|
YOUTUBE_REGEXP.test(options.url)) {
|
|
videoType = 'youtube';
|
|
}
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|
|
|
that.type = videoType;
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|
|
|
if (videoType === 'youtube') {
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|
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// Try to load the API in the meantime
|
|
VideoWrapper.loadYoutubeAPI();
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|
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|
that.ytId = options.url.match(YOUTUBE_REGEXP)[2];
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|
var src = 'https://www.youtube.com/embed/' + that.ytId +
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|
'?rel=0&autoplay=0&showinfo=0&controls=0&modestbranding=1' +
|
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'&cc_load_policy=0&disablekb=1&iv_load_policy=3&loop=0' +
|
|
'&enablejsapi=1&origin=' + encodeURIComponent(window.location.origin);
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|
|
|
that.__ytStartMuted = !!options.mute || options.mute === undefined;
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|
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$video = $('<iframe />')
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|
.attr({ 'src_to_load': src })
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|
.css({ 'border': 0, 'margin': 0, 'padding': 0 })
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|
.data('player', that);
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|
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|
if (options.loop) {
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|
$video.on('ended.loop', function () {
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|
if (!that.__manuallyStopped) {
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|
that.play();
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|
}
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|
});
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|
}
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|
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|
that.ytReady = false;
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|
setVideoElement();
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|
if (window['YT']) {
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|
that._initYoutube();
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|
$video.trigger('initsuccess');
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|
} else {
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|
$(window).one('youtube_api_load', function () {
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|
that._initYoutube();
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|
$video.trigger('initsuccess');
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|
});
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|
}
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|
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|
}
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|
else {
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|
// Traditional <video> tag with multiple sources
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|
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|
$video = $('<video>')
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|
.prop('autoplay', false)
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|
.prop('controls', false)
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|
.prop('loop', !!options.loop)
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|
.prop('muted', !!options.mute || options.mute === undefined)
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|
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|
// Let the first frames be available before playback, as we do transitions
|
|
.prop('preload', 'auto')
|
|
.prop('poster', options.poster || '');
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|
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|
var sources = (options.url instanceof Array) ? options.url : [options.url];
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|
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|
for (var i = 0; i < sources.length; i++) {
|
|
var sourceItem = sources[i];
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|
if (typeof(sourceItem) === 'string') {
|
|
sourceItem = { src: sourceItem };
|
|
}
|
|
$('<source>')
|
|
.attr('src', sourceItem.src)
|
|
// Make sure to not specify type if unknown -
|
|
// so the browser will try to autodetect.
|
|
.attr('type', sourceItem.type || null)
|
|
.appendTo($video);
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|
}
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|
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|
if (!$video[0].canPlayType || !sources.length) {
|
|
$video.trigger('initerror');
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|
} else {
|
|
$video.trigger('initsuccess');
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|
}
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|
|
|
setVideoElement();
|
|
}
|
|
|
|
};
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|
|
|
VideoWrapper.prototype._initYoutube = function () {
|
|
var that = this;
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|
|
|
var YT = window['YT'];
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|
|
|
that.$video
|
|
.attr('src', that.$video.attr('src_to_load'))
|
|
.removeAttr('src_to_load');
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|
|
|
// It won't init if it's not in the DOM, so we emulate that
|
|
var hasParent = !!that.$video[0].parentNode;
|
|
if (!hasParent) {
|
|
var $tmpParent = $('<div>').css('display', 'none !important').appendTo(document.body);
|
|
that.$video.appendTo($tmpParent);
|
|
}
|
|
|
|
var player = new YT.Player(that.video, {
|
|
events: {
|
|
'onReady': function () {
|
|
|
|
if (that.__ytStartMuted) {
|
|
player.mute();
|
|
}
|
|
|
|
if (!hasParent) {
|
|
// Restore parent to old state - without interrupting any changes
|
|
if (that.$video[0].parentNode === $tmpParent[0]) {
|
|
that.$video.detach();
|
|
}
|
|
$tmpParent.remove();
|
|
}
|
|
|
|
that.ytReady = true;
|
|
that._updateYoutubeSize();
|
|
that.$video.trigger('canplay');
|
|
},
|
|
'onStateChange': function (event) {
|
|
switch (event.data) {
|
|
case YT.PlayerState.PLAYING:
|
|
that.$video.trigger('playing');
|
|
break;
|
|
case YT.PlayerState.ENDED:
|
|
that.$video.trigger('ended');
|
|
break;
|
|
case YT.PlayerState.PAUSED:
|
|
that.$video.trigger('pause');
|
|
break;
|
|
case YT.PlayerState.BUFFERING:
|
|
that.$video.trigger('waiting');
|
|
break;
|
|
case YT.PlayerState.CUED:
|
|
that.$video.trigger('canplay');
|
|
break;
|
|
}
|
|
},
|
|
'onPlaybackQualityChange': function () {
|
|
that._updateYoutubeSize();
|
|
that.$video.trigger('resize');
|
|
},
|
|
'onError': function (err) {
|
|
that.hasError = true;
|
|
that.$video.trigger({ 'type': 'error', 'error': err });
|
|
}
|
|
}
|
|
});
|
|
|
|
that.ytPlayer = player;
|
|
|
|
return that;
|
|
};
|
|
|
|
VideoWrapper.prototype._updateYoutubeSize = function () {
|
|
var that = this;
|
|
|
|
switch (that.ytPlayer.getPlaybackQuality() || 'medium') {
|
|
case 'small':
|
|
that.video.videoWidth = 426;
|
|
that.video.videoHeight = 240;
|
|
break;
|
|
case 'medium':
|
|
that.video.videoWidth = 640;
|
|
that.video.videoHeight = 360;
|
|
break;
|
|
default:
|
|
case 'large':
|
|
that.video.videoWidth = 854;
|
|
that.video.videoHeight = 480;
|
|
break;
|
|
case 'hd720':
|
|
that.video.videoWidth = 1280;
|
|
that.video.videoHeight = 720;
|
|
break;
|
|
case 'hd1080':
|
|
that.video.videoWidth = 1920;
|
|
that.video.videoHeight = 1080;
|
|
break;
|
|
case 'highres':
|
|
that.video.videoWidth = 2560;
|
|
that.video.videoHeight = 1440;
|
|
break;
|
|
}
|
|
|
|
return that;
|
|
};
|
|
|
|
VideoWrapper.prototype.play = function () {
|
|
var that = this;
|
|
|
|
that.__manuallyStopped = false;
|
|
|
|
if (that.type === 'youtube') {
|
|
if (that.ytReady) {
|
|
that.$video.trigger('play');
|
|
that.ytPlayer.playVideo();
|
|
}
|
|
} else {
|
|
that.video.play();
|
|
}
|
|
|
|
return that;
|
|
};
|
|
|
|
VideoWrapper.prototype.pause = function () {
|
|
var that = this;
|
|
|
|
that.__manuallyStopped = false;
|
|
|
|
if (that.type === 'youtube') {
|
|
if (that.ytReady) {
|
|
that.ytPlayer.pauseVideo();
|
|
}
|
|
} else {
|
|
that.video.pause();
|
|
}
|
|
|
|
return that;
|
|
};
|
|
|
|
VideoWrapper.prototype.stop = function () {
|
|
var that = this;
|
|
|
|
that.__manuallyStopped = true;
|
|
|
|
if (that.type === 'youtube') {
|
|
if (that.ytReady) {
|
|
that.ytPlayer.pauseVideo();
|
|
that.ytPlayer.seekTo(0);
|
|
}
|
|
} else {
|
|
that.video.pause();
|
|
that.video.currentTime = 0;
|
|
}
|
|
|
|
return that;
|
|
};
|
|
|
|
VideoWrapper.prototype.destroy = function () {
|
|
var that = this;
|
|
|
|
if (that.ytPlayer) {
|
|
that.ytPlayer.destroy();
|
|
}
|
|
|
|
that.$video.remove();
|
|
|
|
return that;
|
|
};
|
|
|
|
VideoWrapper.prototype.getCurrentTime = function (seconds) {
|
|
var that = this;
|
|
|
|
if (that.type === 'youtube') {
|
|
if (that.ytReady) {
|
|
return that.ytPlayer.getCurrentTime();
|
|
}
|
|
} else {
|
|
return that.video.currentTime;
|
|
}
|
|
|
|
return 0;
|
|
};
|
|
|
|
VideoWrapper.prototype.setCurrentTime = function (seconds) {
|
|
var that = this;
|
|
|
|
if (that.type === 'youtube') {
|
|
if (that.ytReady) {
|
|
that.ytPlayer.seekTo(seconds, true);
|
|
}
|
|
} else {
|
|
that.video.currentTime = seconds;
|
|
}
|
|
|
|
return that;
|
|
};
|
|
|
|
VideoWrapper.prototype.getDuration = function () {
|
|
var that = this;
|
|
|
|
if (that.type === 'youtube') {
|
|
if (that.ytReady) {
|
|
return that.ytPlayer.getDuration();
|
|
}
|
|
} else {
|
|
return that.video.duration;
|
|
}
|
|
|
|
return 0;
|
|
};
|
|
|
|
/**
|
|
* This will load the youtube API (if not loaded yet)
|
|
* Use $(window).one('youtube_api_load', ...) to listen for API loaded event
|
|
*/
|
|
VideoWrapper.loadYoutubeAPI = function () {
|
|
if (window['YT']) {
|
|
return;
|
|
}
|
|
if (!$('script[src*=www\\.youtube\\.com\\/iframe_api]').length) {
|
|
$('<script type="text/javascript" src="https://www.youtube.com/iframe_api">').appendTo('body');
|
|
}
|
|
var ytAPILoadInt = setInterval(function () {
|
|
if (window['YT'] && window['YT'].loaded) {
|
|
$(window).trigger('youtube_api_load');
|
|
clearTimeout(ytAPILoadInt);
|
|
}
|
|
}, 50);
|
|
};
|
|
|
|
var getDeviceOrientation = function () {
|
|
|
|
if ('matchMedia' in window) {
|
|
if (window.matchMedia("(orientation: portrait)").matches) {
|
|
return 'portrait';
|
|
} else if (window.matchMedia("(orientation: landscape)").matches) {
|
|
return 'landscape';
|
|
}
|
|
}
|
|
|
|
if (screen.height > screen.width) {
|
|
return 'portrait';
|
|
}
|
|
|
|
// Even square devices have orientation,
|
|
// but a desktop browser may be too old for `matchMedia`.
|
|
// Defaulting to `landscape` for the VERY rare case of a square desktop screen is good enough.
|
|
return 'landscape';
|
|
};
|
|
|
|
var getWindowOrientation = function () {
|
|
if (window.innerHeight > window.innerWidth) {
|
|
return 'portrait';
|
|
}
|
|
if (window.innerWidth > window.innerHeight) {
|
|
return 'landscape';
|
|
}
|
|
|
|
return 'square';
|
|
};
|
|
|
|
/* SUPPORTS FIXED POSITION?
|
|
*
|
|
* Based on code from jQuery Mobile 1.1.0
|
|
* http://jquerymobile.com/
|
|
*
|
|
* In a nutshell, we need to figure out if fixed positioning is supported.
|
|
* Unfortunately, this is very difficult to do on iOS, and usually involves
|
|
* injecting content, scrolling the page, etc.. It's ugly.
|
|
* jQuery Mobile uses this workaround. It's not ideal, but works.
|
|
*
|
|
* Modified to detect IE6
|
|
* ========================= */
|
|
|
|
var supportsFixedPosition = (function () {
|
|
var ua = navigator.userAgent
|
|
, platform = navigator.platform
|
|
// Rendering engine is Webkit, and capture major version
|
|
, wkmatch = ua.match( /AppleWebKit\/([0-9]+)/ )
|
|
, wkversion = !!wkmatch && wkmatch[ 1 ]
|
|
, ffmatch = ua.match( /Fennec\/([0-9]+)/ )
|
|
, ffversion = !!ffmatch && ffmatch[ 1 ]
|
|
, operammobilematch = ua.match( /Opera Mobi\/([0-9]+)/ )
|
|
, omversion = !!operammobilematch && operammobilematch[ 1 ]
|
|
, iematch = ua.match( /MSIE ([0-9]+)/ )
|
|
, ieversion = !!iematch && iematch[ 1 ];
|
|
|
|
return !(
|
|
// iOS 4.3 and older : Platform is iPhone/Pad/Touch and Webkit version is less than 534 (ios5)
|
|
((platform.indexOf( "iPhone" ) > -1 || platform.indexOf( "iPad" ) > -1 || platform.indexOf( "iPod" ) > -1 ) && wkversion && wkversion < 534) ||
|
|
|
|
// Opera Mini
|
|
(window.operamini && ({}).toString.call( window.operamini ) === "[object OperaMini]") ||
|
|
(operammobilematch && omversion < 7458) ||
|
|
|
|
//Android lte 2.1: Platform is Android and Webkit version is less than 533 (Android 2.2)
|
|
(ua.indexOf( "Android" ) > -1 && wkversion && wkversion < 533) ||
|
|
|
|
// Firefox Mobile before 6.0 -
|
|
(ffversion && ffversion < 6) ||
|
|
|
|
// WebOS less than 3
|
|
("palmGetResource" in window && wkversion && wkversion < 534) ||
|
|
|
|
// MeeGo
|
|
(ua.indexOf( "MeeGo" ) > -1 && ua.indexOf( "NokiaBrowser/8.5.0" ) > -1) ||
|
|
|
|
// IE6
|
|
(ieversion && ieversion <= 6)
|
|
);
|
|
}());
|
|
|
|
}(jQuery, window));
|