File: //usr/local/CyberCP/baseTemplate/static/baseTemplate/assets/widgets/skrollr/skrollr.js
/*!
* skrollr core
*
* Alexander Prinzhorn - https://github.com/Prinzhorn/skrollr
*
* Free to use under terms of MIT license
*/
(function(window, document, undefined) {
'use strict';
/*
* Global api.
*/
var skrollr = {
get: function() {
return _instance;
},
//Main entry point.
init: function(options) {
return _instance || new Skrollr(options);
},
VERSION: '0.6.26'
};
//Minify optimization.
var hasProp = Object.prototype.hasOwnProperty;
var Math = window.Math;
var getStyle = window.getComputedStyle;
//They will be filled when skrollr gets initialized.
var documentElement;
var body;
var EVENT_TOUCHSTART = 'touchstart';
var EVENT_TOUCHMOVE = 'touchmove';
var EVENT_TOUCHCANCEL = 'touchcancel';
var EVENT_TOUCHEND = 'touchend';
var SKROLLABLE_CLASS = 'skrollable';
var SKROLLABLE_BEFORE_CLASS = SKROLLABLE_CLASS + '-before';
var SKROLLABLE_BETWEEN_CLASS = SKROLLABLE_CLASS + '-between';
var SKROLLABLE_AFTER_CLASS = SKROLLABLE_CLASS + '-after';
var SKROLLR_CLASS = 'skrollr';
var NO_SKROLLR_CLASS = 'no-' + SKROLLR_CLASS;
var SKROLLR_DESKTOP_CLASS = SKROLLR_CLASS + '-desktop';
var SKROLLR_MOBILE_CLASS = SKROLLR_CLASS + '-mobile';
var DEFAULT_EASING = 'linear';
var DEFAULT_DURATION = 1000;//ms
var DEFAULT_MOBILE_DECELERATION = 0.004;//pixel/ms²
var DEFAULT_SMOOTH_SCROLLING_DURATION = 200;//ms
var ANCHOR_START = 'start';
var ANCHOR_END = 'end';
var ANCHOR_CENTER = 'center';
var ANCHOR_BOTTOM = 'bottom';
//The property which will be added to the DOM element to hold the ID of the skrollable.
var SKROLLABLE_ID_DOM_PROPERTY = '___skrollable_id';
var rxTouchIgnoreTags = /^(?:input|textarea|button|select)$/i;
var rxTrim = /^\s+|\s+$/g;
//Find all data-attributes. data-[_constant]-[offset]-[anchor]-[anchor].
var rxKeyframeAttribute = /^data(?:-(_\w+))?(?:-?(-?\d*\.?\d+p?))?(?:-?(start|end|top|center|bottom))?(?:-?(top|center|bottom))?$/;
var rxPropValue = /\s*(@?[\w\-\[\]]+)\s*:\s*(.+?)\s*(?:;|$)/gi;
//Easing function names follow the property in square brackets.
var rxPropEasing = /^(@?[a-z\-]+)\[(\w+)\]$/;
var rxCamelCase = /-([a-z0-9_])/g;
var rxCamelCaseFn = function(str, letter) {
return letter.toUpperCase();
};
//Numeric values with optional sign.
var rxNumericValue = /[\-+]?[\d]*\.?[\d]+/g;
//Used to replace occurences of {?} with a number.
var rxInterpolateString = /\{\?\}/g;
//Finds rgb(a) colors, which don't use the percentage notation.
var rxRGBAIntegerColor = /rgba?\(\s*-?\d+\s*,\s*-?\d+\s*,\s*-?\d+/g;
//Finds all gradients.
var rxGradient = /[a-z\-]+-gradient/g;
//Vendor prefix. Will be set once skrollr gets initialized.
var theCSSPrefix = '';
var theDashedCSSPrefix = '';
//Will be called once (when skrollr gets initialized).
var detectCSSPrefix = function() {
//Only relevant prefixes. May be extended.
//Could be dangerous if there will ever be a CSS property which actually starts with "ms". Don't hope so.
var rxPrefixes = /^(?:O|Moz|webkit|ms)|(?:-(?:o|moz|webkit|ms)-)/;
//Detect prefix for current browser by finding the first property using a prefix.
if(!getStyle) {
return;
}
var style = getStyle(body, null);
for(var k in style) {
//We check the key and if the key is a number, we check the value as well, because safari's getComputedStyle returns some weird array-like thingy.
theCSSPrefix = (k.match(rxPrefixes) || (+k == k && style[k].match(rxPrefixes)));
if(theCSSPrefix) {
break;
}
}
//Did we even detect a prefix?
if(!theCSSPrefix) {
theCSSPrefix = theDashedCSSPrefix = '';
return;
}
theCSSPrefix = theCSSPrefix[0];
//We could have detected either a dashed prefix or this camelCaseish-inconsistent stuff.
if(theCSSPrefix.slice(0,1) === '-') {
theDashedCSSPrefix = theCSSPrefix;
//There's no logic behind these. Need a look up.
theCSSPrefix = ({
'-webkit-': 'webkit',
'-moz-': 'Moz',
'-ms-': 'ms',
'-o-': 'O'
})[theCSSPrefix];
} else {
theDashedCSSPrefix = '-' + theCSSPrefix.toLowerCase() + '-';
}
};
var polyfillRAF = function() {
var requestAnimFrame = window.requestAnimationFrame || window[theCSSPrefix.toLowerCase() + 'RequestAnimationFrame'];
var lastTime = _now();
if(_isMobile || !requestAnimFrame) {
requestAnimFrame = function(callback) {
//How long did it take to render?
var deltaTime = _now() - lastTime;
var delay = Math.max(0, 1000 / 60 - deltaTime);
return window.setTimeout(function() {
lastTime = _now();
callback();
}, delay);
};
}
return requestAnimFrame;
};
var polyfillCAF = function() {
var cancelAnimFrame = window.cancelAnimationFrame || window[theCSSPrefix.toLowerCase() + 'CancelAnimationFrame'];
if(_isMobile || !cancelAnimFrame) {
cancelAnimFrame = function(timeout) {
return window.clearTimeout(timeout);
};
}
return cancelAnimFrame;
};
//Built-in easing functions.
var easings = {
begin: function() {
return 0;
},
end: function() {
return 1;
},
linear: function(p) {
return p;
},
quadratic: function(p) {
return p * p;
},
cubic: function(p) {
return p * p * p;
},
swing: function(p) {
return (-Math.cos(p * Math.PI) / 2) + 0.5;
},
sqrt: function(p) {
return Math.sqrt(p);
},
outCubic: function(p) {
return (Math.pow((p - 1), 3) + 1);
},
//see https://www.desmos.com/calculator/tbr20s8vd2 for how I did this
bounce: function(p) {
var a;
if(p <= 0.5083) {
a = 3;
} else if(p <= 0.8489) {
a = 9;
} else if(p <= 0.96208) {
a = 27;
} else if(p <= 0.99981) {
a = 91;
} else {
return 1;
}
return 1 - Math.abs(3 * Math.cos(p * a * 1.028) / a);
}
};
/**
* Constructor.
*/
function Skrollr(options) {
documentElement = document.documentElement;
body = document.body;
detectCSSPrefix();
_instance = this;
options = options || {};
_constants = options.constants || {};
//We allow defining custom easings or overwrite existing.
if(options.easing) {
for(var e in options.easing) {
easings[e] = options.easing[e];
}
}
_edgeStrategy = options.edgeStrategy || 'set';
_listeners = {
//Function to be called right before rendering.
beforerender: options.beforerender,
//Function to be called right after finishing rendering.
render: options.render,
//Function to be called whenever an element with the `data-emit-events` attribute passes a keyframe.
keyframe: options.keyframe
};
//forceHeight is true by default
_forceHeight = options.forceHeight !== false;
if(_forceHeight) {
_scale = options.scale || 1;
}
_mobileDeceleration = options.mobileDeceleration || DEFAULT_MOBILE_DECELERATION;
_smoothScrollingEnabled = options.smoothScrolling !== false;
_smoothScrollingDuration = options.smoothScrollingDuration || DEFAULT_SMOOTH_SCROLLING_DURATION;
//Dummy object. Will be overwritten in the _render method when smooth scrolling is calculated.
_smoothScrolling = {
targetTop: _instance.getScrollTop()
};
//A custom check function may be passed.
_isMobile = ((options.mobileCheck || function() {
return (/Android|iPhone|iPad|iPod|BlackBerry/i).test(navigator.userAgent || navigator.vendor || window.opera);
})());
if(_isMobile) {
_skrollrBody = document.getElementById('skrollr-body');
//Detect 3d transform if there's a skrollr-body (only needed for #skrollr-body).
if(_skrollrBody) {
_detect3DTransforms();
}
_initMobile();
_updateClass(documentElement, [SKROLLR_CLASS, SKROLLR_MOBILE_CLASS], [NO_SKROLLR_CLASS]);
} else {
_updateClass(documentElement, [SKROLLR_CLASS, SKROLLR_DESKTOP_CLASS], [NO_SKROLLR_CLASS]);
}
//Triggers parsing of elements and a first reflow.
_instance.refresh();
_addEvent(window, 'resize orientationchange', function() {
var width = documentElement.clientWidth;
var height = documentElement.clientHeight;
//Only reflow if the size actually changed (#271).
if(height !== _lastViewportHeight || width !== _lastViewportWidth) {
_lastViewportHeight = height;
_lastViewportWidth = width;
_requestReflow = true;
}
});
var requestAnimFrame = polyfillRAF();
//Let's go.
(function animloop(){
_render();
_animFrame = requestAnimFrame(animloop);
}());
return _instance;
}
/**
* (Re)parses some or all elements.
*/
Skrollr.prototype.refresh = function(elements) {
var elementIndex;
var elementsLength;
var ignoreID = false;
//Completely reparse anything without argument.
if(elements === undefined) {
//Ignore that some elements may already have a skrollable ID.
ignoreID = true;
_skrollables = [];
_skrollableIdCounter = 0;
elements = document.getElementsByTagName('*');
} else if(elements.length === undefined) {
//We also accept a single element as parameter.
elements = [elements];
}
elementIndex = 0;
elementsLength = elements.length;
for(; elementIndex < elementsLength; elementIndex++) {
var el = elements[elementIndex];
var anchorTarget = el;
var keyFrames = [];
//If this particular element should be smooth scrolled.
var smoothScrollThis = _smoothScrollingEnabled;
//The edge strategy for this particular element.
var edgeStrategy = _edgeStrategy;
//If this particular element should emit keyframe events.
var emitEvents = false;
//If we're reseting the counter, remove any old element ids that may be hanging around.
if(ignoreID && SKROLLABLE_ID_DOM_PROPERTY in el) {
delete el[SKROLLABLE_ID_DOM_PROPERTY];
}
if(!el.attributes) {
continue;
}
//Iterate over all attributes and search for key frame attributes.
var attributeIndex = 0;
var attributesLength = el.attributes.length;
for (; attributeIndex < attributesLength; attributeIndex++) {
var attr = el.attributes[attributeIndex];
if(attr.name === 'data-anchor-target') {
anchorTarget = document.querySelector(attr.value);
if(anchorTarget === null) {
throw 'Unable to find anchor target "' + attr.value + '"';
}
continue;
}
//Global smooth scrolling can be overridden by the element attribute.
if(attr.name === 'data-smooth-scrolling') {
smoothScrollThis = attr.value !== 'off';
continue;
}
//Global edge strategy can be overridden by the element attribute.
if(attr.name === 'data-edge-strategy') {
edgeStrategy = attr.value;
continue;
}
//Is this element tagged with the `data-emit-events` attribute?
if(attr.name === 'data-emit-events') {
emitEvents = true;
continue;
}
var match = attr.name.match(rxKeyframeAttribute);
if(match === null) {
continue;
}
var kf = {
props: attr.value,
//Point back to the element as well.
element: el,
//The name of the event which this keyframe will fire, if emitEvents is
eventType: attr.name.replace(rxCamelCase, rxCamelCaseFn)
};
keyFrames.push(kf);
var constant = match[1];
if(constant) {
//Strip the underscore prefix.
kf.constant = constant.substr(1);
}
//Get the key frame offset.
var offset = match[2];
//Is it a percentage offset?
if(/p$/.test(offset)) {
kf.isPercentage = true;
kf.offset = (offset.slice(0, -1) | 0) / 100;
} else {
kf.offset = (offset | 0);
}
var anchor1 = match[3];
//If second anchor is not set, the first will be taken for both.
var anchor2 = match[4] || anchor1;
//"absolute" (or "classic") mode, where numbers mean absolute scroll offset.
if(!anchor1 || anchor1 === ANCHOR_START || anchor1 === ANCHOR_END) {
kf.mode = 'absolute';
//data-end needs to be calculated after all key frames are known.
if(anchor1 === ANCHOR_END) {
kf.isEnd = true;
} else if(!kf.isPercentage) {
//For data-start we can already set the key frame w/o calculations.
//#59: "scale" options should only affect absolute mode.
kf.offset = kf.offset * _scale;
}
}
//"relative" mode, where numbers are relative to anchors.
else {
kf.mode = 'relative';
kf.anchors = [anchor1, anchor2];
}
}
//Does this element have key frames?
if(!keyFrames.length) {
continue;
}
//Will hold the original style and class attributes before we controlled the element (see #80).
var styleAttr, classAttr;
var id;
if(!ignoreID && SKROLLABLE_ID_DOM_PROPERTY in el) {
//We already have this element under control. Grab the corresponding skrollable id.
id = el[SKROLLABLE_ID_DOM_PROPERTY];
styleAttr = _skrollables[id].styleAttr;
classAttr = _skrollables[id].classAttr;
} else {
//It's an unknown element. Asign it a new skrollable id.
id = (el[SKROLLABLE_ID_DOM_PROPERTY] = _skrollableIdCounter++);
styleAttr = el.style.cssText;
classAttr = _getClass(el);
}
_skrollables[id] = {
element: el,
styleAttr: styleAttr,
classAttr: classAttr,
anchorTarget: anchorTarget,
keyFrames: keyFrames,
smoothScrolling: smoothScrollThis,
edgeStrategy: edgeStrategy,
emitEvents: emitEvents,
lastFrameIndex: -1
};
_updateClass(el, [SKROLLABLE_CLASS], []);
}
//Reflow for the first time.
_reflow();
//Now that we got all key frame numbers right, actually parse the properties.
elementIndex = 0;
elementsLength = elements.length;
for(; elementIndex < elementsLength; elementIndex++) {
var sk = _skrollables[elements[elementIndex][SKROLLABLE_ID_DOM_PROPERTY]];
if(sk === undefined) {
continue;
}
//Parse the property string to objects
_parseProps(sk);
//Fill key frames with missing properties from left and right
_fillProps(sk);
}
return _instance;
};
/**
* Transform "relative" mode to "absolute" mode.
* That is, calculate anchor position and offset of element.
*/
Skrollr.prototype.relativeToAbsolute = function(element, viewportAnchor, elementAnchor) {
var viewportHeight = documentElement.clientHeight;
var box = element.getBoundingClientRect();
var absolute = box.top;
//#100: IE doesn't supply "height" with getBoundingClientRect.
var boxHeight = box.bottom - box.top;
if(viewportAnchor === ANCHOR_BOTTOM) {
absolute -= viewportHeight;
} else if(viewportAnchor === ANCHOR_CENTER) {
absolute -= viewportHeight / 2;
}
if(elementAnchor === ANCHOR_BOTTOM) {
absolute += boxHeight;
} else if(elementAnchor === ANCHOR_CENTER) {
absolute += boxHeight / 2;
}
//Compensate scrolling since getBoundingClientRect is relative to viewport.
absolute += _instance.getScrollTop();
return (absolute + 0.5) | 0;
};
/**
* Animates scroll top to new position.
*/
Skrollr.prototype.animateTo = function(top, options) {
options = options || {};
var now = _now();
var scrollTop = _instance.getScrollTop();
//Setting this to a new value will automatically cause the current animation to stop, if any.
_scrollAnimation = {
startTop: scrollTop,
topDiff: top - scrollTop,
targetTop: top,
duration: options.duration || DEFAULT_DURATION,
startTime: now,
endTime: now + (options.duration || DEFAULT_DURATION),
easing: easings[options.easing || DEFAULT_EASING],
done: options.done
};
//Don't queue the animation if there's nothing to animate.
if(!_scrollAnimation.topDiff) {
if(_scrollAnimation.done) {
_scrollAnimation.done.call(_instance, false);
}
_scrollAnimation = undefined;
}
return _instance;
};
/**
* Stops animateTo animation.
*/
Skrollr.prototype.stopAnimateTo = function() {
if(_scrollAnimation && _scrollAnimation.done) {
_scrollAnimation.done.call(_instance, true);
}
_scrollAnimation = undefined;
};
/**
* Returns if an animation caused by animateTo is currently running.
*/
Skrollr.prototype.isAnimatingTo = function() {
return !!_scrollAnimation;
};
Skrollr.prototype.isMobile = function() {
return _isMobile;
};
Skrollr.prototype.setScrollTop = function(top, force) {
_forceRender = (force === true);
if(_isMobile) {
_mobileOffset = Math.min(Math.max(top, 0), _maxKeyFrame);
} else {
window.scrollTo(0, top);
}
return _instance;
};
Skrollr.prototype.getScrollTop = function() {
if(_isMobile) {
return _mobileOffset;
} else {
return window.pageYOffset || documentElement.scrollTop || body.scrollTop || 0;
}
};
Skrollr.prototype.getMaxScrollTop = function() {
return _maxKeyFrame;
};
Skrollr.prototype.on = function(name, fn) {
_listeners[name] = fn;
return _instance;
};
Skrollr.prototype.off = function(name) {
delete _listeners[name];
return _instance;
};
Skrollr.prototype.destroy = function() {
var cancelAnimFrame = polyfillCAF();
cancelAnimFrame(_animFrame);
_removeAllEvents();
_updateClass(documentElement, [NO_SKROLLR_CLASS], [SKROLLR_CLASS, SKROLLR_DESKTOP_CLASS, SKROLLR_MOBILE_CLASS]);
var skrollableIndex = 0;
var skrollablesLength = _skrollables.length;
for(; skrollableIndex < skrollablesLength; skrollableIndex++) {
_reset(_skrollables[skrollableIndex].element);
}
documentElement.style.overflow = body.style.overflow = '';
documentElement.style.height = body.style.height = '';
if(_skrollrBody) {
skrollr.setStyle(_skrollrBody, 'transform', 'none');
}
_instance = undefined;
_skrollrBody = undefined;
_listeners = undefined;
_forceHeight = undefined;
_maxKeyFrame = 0;
_scale = 1;
_constants = undefined;
_mobileDeceleration = undefined;
_direction = 'down';
_lastTop = -1;
_lastViewportWidth = 0;
_lastViewportHeight = 0;
_requestReflow = false;
_scrollAnimation = undefined;
_smoothScrollingEnabled = undefined;
_smoothScrollingDuration = undefined;
_smoothScrolling = undefined;
_forceRender = undefined;
_skrollableIdCounter = 0;
_edgeStrategy = undefined;
_isMobile = false;
_mobileOffset = 0;
_translateZ = undefined;
};
/*
Private methods.
*/
var _initMobile = function() {
var initialElement;
var initialTouchY;
var initialTouchX;
var currentElement;
var currentTouchY;
var currentTouchX;
var lastTouchY;
var deltaY;
var initialTouchTime;
var currentTouchTime;
var lastTouchTime;
var deltaTime;
_addEvent(documentElement, [EVENT_TOUCHSTART, EVENT_TOUCHMOVE, EVENT_TOUCHCANCEL, EVENT_TOUCHEND].join(' '), function(e) {
var touch = e.changedTouches[0];
currentElement = e.target;
//We don't want text nodes.
while(currentElement.nodeType === 3) {
currentElement = currentElement.parentNode;
}
currentTouchY = touch.clientY;
currentTouchX = touch.clientX;
currentTouchTime = e.timeStamp;
if(!rxTouchIgnoreTags.test(currentElement.tagName)) {
e.preventDefault();
}
switch(e.type) {
case EVENT_TOUCHSTART:
//The last element we tapped on.
if(initialElement) {
initialElement.blur();
}
_instance.stopAnimateTo();
initialElement = currentElement;
initialTouchY = lastTouchY = currentTouchY;
initialTouchX = currentTouchX;
initialTouchTime = currentTouchTime;
break;
case EVENT_TOUCHMOVE:
//Prevent default event on touchIgnore elements in case they don't have focus yet.
if(rxTouchIgnoreTags.test(currentElement.tagName) && document.activeElement !== currentElement) {
e.preventDefault();
}
deltaY = currentTouchY - lastTouchY;
deltaTime = currentTouchTime - lastTouchTime;
_instance.setScrollTop(_mobileOffset - deltaY, true);
lastTouchY = currentTouchY;
lastTouchTime = currentTouchTime;
break;
default:
case EVENT_TOUCHCANCEL:
case EVENT_TOUCHEND:
var distanceY = initialTouchY - currentTouchY;
var distanceX = initialTouchX - currentTouchX;
var distance2 = distanceX * distanceX + distanceY * distanceY;
//Check if it was more like a tap (moved less than 7px).
if(distance2 < 49) {
if(!rxTouchIgnoreTags.test(initialElement.tagName)) {
initialElement.focus();
//It was a tap, click the element.
var clickEvent = document.createEvent('MouseEvents');
clickEvent.initMouseEvent('click', true, true, e.view, 1, touch.screenX, touch.screenY, touch.clientX, touch.clientY, e.ctrlKey, e.altKey, e.shiftKey, e.metaKey, 0, null);
initialElement.dispatchEvent(clickEvent);
}
return;
}
initialElement = undefined;
var speed = deltaY / deltaTime;
//Cap speed at 3 pixel/ms.
speed = Math.max(Math.min(speed, 3), -3);
var duration = Math.abs(speed / _mobileDeceleration);
var targetOffset = speed * duration + 0.5 * _mobileDeceleration * duration * duration;
var targetTop = _instance.getScrollTop() - targetOffset;
//Relative duration change for when scrolling above bounds.
var targetRatio = 0;
//Change duration proportionally when scrolling would leave bounds.
if(targetTop > _maxKeyFrame) {
targetRatio = (_maxKeyFrame - targetTop) / targetOffset;
targetTop = _maxKeyFrame;
} else if(targetTop < 0) {
targetRatio = -targetTop / targetOffset;
targetTop = 0;
}
duration = duration * (1 - targetRatio);
_instance.animateTo((targetTop + 0.5) | 0, {easing: 'outCubic', duration: duration});
break;
}
});
//Just in case there has already been some native scrolling, reset it.
window.scrollTo(0, 0);
documentElement.style.overflow = body.style.overflow = 'hidden';
};
/**
* Updates key frames which depend on others / need to be updated on resize.
* That is "end" in "absolute" mode and all key frames in "relative" mode.
* Also handles constants, because they may change on resize.
*/
var _updateDependentKeyFrames = function() {
var viewportHeight = documentElement.clientHeight;
var processedConstants = _processConstants();
var skrollable;
var element;
var anchorTarget;
var keyFrames;
var keyFrameIndex;
var keyFramesLength;
var kf;
var skrollableIndex;
var skrollablesLength;
var offset;
var constantValue;
//First process all relative-mode elements and find the max key frame.
skrollableIndex = 0;
skrollablesLength = _skrollables.length;
for(; skrollableIndex < skrollablesLength; skrollableIndex++) {
skrollable = _skrollables[skrollableIndex];
element = skrollable.element;
anchorTarget = skrollable.anchorTarget;
keyFrames = skrollable.keyFrames;
keyFrameIndex = 0;
keyFramesLength = keyFrames.length;
for(; keyFrameIndex < keyFramesLength; keyFrameIndex++) {
kf = keyFrames[keyFrameIndex];
offset = kf.offset;
constantValue = processedConstants[kf.constant] || 0;
kf.frame = offset;
if(kf.isPercentage) {
//Convert the offset to percentage of the viewport height.
offset = offset * viewportHeight;
//Absolute + percentage mode.
kf.frame = offset;
}
if(kf.mode === 'relative') {
_reset(element);
kf.frame = _instance.relativeToAbsolute(anchorTarget, kf.anchors[0], kf.anchors[1]) - offset;
_reset(element, true);
}
kf.frame += constantValue;
//Only search for max key frame when forceHeight is enabled.
if(_forceHeight) {
//Find the max key frame, but don't use one of the data-end ones for comparison.
if(!kf.isEnd && kf.frame > _maxKeyFrame) {
_maxKeyFrame = kf.frame;
}
}
}
}
//#133: The document can be larger than the maxKeyFrame we found.
_maxKeyFrame = Math.max(_maxKeyFrame, _getDocumentHeight());
//Now process all data-end keyframes.
skrollableIndex = 0;
skrollablesLength = _skrollables.length;
for(; skrollableIndex < skrollablesLength; skrollableIndex++) {
skrollable = _skrollables[skrollableIndex];
keyFrames = skrollable.keyFrames;
keyFrameIndex = 0;
keyFramesLength = keyFrames.length;
for(; keyFrameIndex < keyFramesLength; keyFrameIndex++) {
kf = keyFrames[keyFrameIndex];
constantValue = processedConstants[kf.constant] || 0;
if(kf.isEnd) {
kf.frame = _maxKeyFrame - kf.offset + constantValue;
}
}
skrollable.keyFrames.sort(_keyFrameComparator);
}
};
/**
* Calculates and sets the style properties for the element at the given frame.
* @param fakeFrame The frame to render at when smooth scrolling is enabled.
* @param actualFrame The actual frame we are at.
*/
var _calcSteps = function(fakeFrame, actualFrame) {
//Iterate over all skrollables.
var skrollableIndex = 0;
var skrollablesLength = _skrollables.length;
for(; skrollableIndex < skrollablesLength; skrollableIndex++) {
var skrollable = _skrollables[skrollableIndex];
var element = skrollable.element;
var frame = skrollable.smoothScrolling ? fakeFrame : actualFrame;
var frames = skrollable.keyFrames;
var framesLength = frames.length;
var firstFrame = frames[0];
var lastFrame = frames[frames.length - 1];
var beforeFirst = frame < firstFrame.frame;
var afterLast = frame > lastFrame.frame;
var firstOrLastFrame = beforeFirst ? firstFrame : lastFrame;
var emitEvents = skrollable.emitEvents;
var lastFrameIndex = skrollable.lastFrameIndex;
var key;
var value;
//If we are before/after the first/last frame, set the styles according to the given edge strategy.
if(beforeFirst || afterLast) {
//Check if we already handled this edge case last time.
//Note: using setScrollTop it's possible that we jumped from one edge to the other.
if(beforeFirst && skrollable.edge === -1 || afterLast && skrollable.edge === 1) {
continue;
}
//Add the skrollr-before or -after class.
if(beforeFirst) {
_updateClass(element, [SKROLLABLE_BEFORE_CLASS], [SKROLLABLE_AFTER_CLASS, SKROLLABLE_BETWEEN_CLASS]);
//This handles the special case where we exit the first keyframe.
if(emitEvents && lastFrameIndex > -1) {
_emitEvent(element, firstFrame.eventType, _direction);
skrollable.lastFrameIndex = -1;
}
} else {
_updateClass(element, [SKROLLABLE_AFTER_CLASS], [SKROLLABLE_BEFORE_CLASS, SKROLLABLE_BETWEEN_CLASS]);
//This handles the special case where we exit the last keyframe.
if(emitEvents && lastFrameIndex < framesLength) {
_emitEvent(element, lastFrame.eventType, _direction);
skrollable.lastFrameIndex = framesLength;
}
}
//Remember that we handled the edge case (before/after the first/last keyframe).
skrollable.edge = beforeFirst ? -1 : 1;
switch(skrollable.edgeStrategy) {
case 'reset':
_reset(element);
continue;
case 'ease':
//Handle this case like it would be exactly at first/last keyframe and just pass it on.
frame = firstOrLastFrame.frame;
break;
default:
case 'set':
var props = firstOrLastFrame.props;
for(key in props) {
if(hasProp.call(props, key)) {
value = _interpolateString(props[key].value);
//Set style or attribute.
if(key.indexOf('@') === 0) {
element.setAttribute(key.substr(1), value);
} else {
skrollr.setStyle(element, key, value);
}
}
}
continue;
}
} else {
//Did we handle an edge last time?
if(skrollable.edge !== 0) {
_updateClass(element, [SKROLLABLE_CLASS, SKROLLABLE_BETWEEN_CLASS], [SKROLLABLE_BEFORE_CLASS, SKROLLABLE_AFTER_CLASS]);
skrollable.edge = 0;
}
}
//Find out between which two key frames we are right now.
var keyFrameIndex = 0;
for(; keyFrameIndex < framesLength - 1; keyFrameIndex++) {
if(frame >= frames[keyFrameIndex].frame && frame <= frames[keyFrameIndex + 1].frame) {
var left = frames[keyFrameIndex];
var right = frames[keyFrameIndex + 1];
for(key in left.props) {
if(hasProp.call(left.props, key)) {
var progress = (frame - left.frame) / (right.frame - left.frame);
//Transform the current progress using the given easing function.
progress = left.props[key].easing(progress);
//Interpolate between the two values
value = _calcInterpolation(left.props[key].value, right.props[key].value, progress);
value = _interpolateString(value);
//Set style or attribute.
if(key.indexOf('@') === 0) {
element.setAttribute(key.substr(1), value);
} else {
skrollr.setStyle(element, key, value);
}
}
}
//Are events enabled on this element?
//This code handles the usual cases of scrolling through different keyframes.
//The special cases of before first and after last keyframe are handled above.
if(emitEvents) {
//Did we pass a new keyframe?
if(lastFrameIndex !== keyFrameIndex) {
if(_direction === 'down') {
_emitEvent(element, left.eventType, _direction);
} else {
_emitEvent(element, right.eventType, _direction);
}
skrollable.lastFrameIndex = keyFrameIndex;
}
}
break;
}
}
}
};
/**
* Renders all elements.
*/
var _render = function() {
if(_requestReflow) {
_requestReflow = false;
_reflow();
}
//We may render something else than the actual scrollbar position.
var renderTop = _instance.getScrollTop();
//If there's an animation, which ends in current render call, call the callback after rendering.
var afterAnimationCallback;
var now = _now();
var progress;
//Before actually rendering handle the scroll animation, if any.
if(_scrollAnimation) {
//It's over
if(now >= _scrollAnimation.endTime) {
renderTop = _scrollAnimation.targetTop;
afterAnimationCallback = _scrollAnimation.done;
_scrollAnimation = undefined;
} else {
//Map the current progress to the new progress using given easing function.
progress = _scrollAnimation.easing((now - _scrollAnimation.startTime) / _scrollAnimation.duration);
renderTop = (_scrollAnimation.startTop + progress * _scrollAnimation.topDiff) | 0;
}
_instance.setScrollTop(renderTop, true);
}
//Smooth scrolling only if there's no animation running and if we're not forcing the rendering.
else if(!_forceRender) {
var smoothScrollingDiff = _smoothScrolling.targetTop - renderTop;
//The user scrolled, start new smooth scrolling.
if(smoothScrollingDiff) {
_smoothScrolling = {
startTop: _lastTop,
topDiff: renderTop - _lastTop,
targetTop: renderTop,
startTime: _lastRenderCall,
endTime: _lastRenderCall + _smoothScrollingDuration
};
}
//Interpolate the internal scroll position (not the actual scrollbar).
if(now <= _smoothScrolling.endTime) {
//Map the current progress to the new progress using easing function.
progress = easings.sqrt((now - _smoothScrolling.startTime) / _smoothScrollingDuration);
renderTop = (_smoothScrolling.startTop + progress * _smoothScrolling.topDiff) | 0;
}
}
//That's were we actually "scroll" on mobile.
if(_isMobile && _skrollrBody) {
//Set the transform ("scroll it").
skrollr.setStyle(_skrollrBody, 'transform', 'translate(0, ' + -(_mobileOffset) + 'px) ' + _translateZ);
}
//Did the scroll position even change?
if(_forceRender || _lastTop !== renderTop) {
//Remember in which direction are we scrolling?
_direction = (renderTop > _lastTop) ? 'down' : (renderTop < _lastTop ? 'up' : _direction);
_forceRender = false;
var listenerParams = {
curTop: renderTop,
lastTop: _lastTop,
maxTop: _maxKeyFrame,
direction: _direction
};
//Tell the listener we are about to render.
var continueRendering = _listeners.beforerender && _listeners.beforerender.call(_instance, listenerParams);
//The beforerender listener function is able the cancel rendering.
if(continueRendering !== false) {
//Now actually interpolate all the styles.
_calcSteps(renderTop, _instance.getScrollTop());
//Remember when we last rendered.
_lastTop = renderTop;
if(_listeners.render) {
_listeners.render.call(_instance, listenerParams);
}
}
if(afterAnimationCallback) {
afterAnimationCallback.call(_instance, false);
}
}
_lastRenderCall = now;
};
/**
* Parses the properties for each key frame of the given skrollable.
*/
var _parseProps = function(skrollable) {
//Iterate over all key frames
var keyFrameIndex = 0;
var keyFramesLength = skrollable.keyFrames.length;
for(; keyFrameIndex < keyFramesLength; keyFrameIndex++) {
var frame = skrollable.keyFrames[keyFrameIndex];
var easing;
var value;
var prop;
var props = {};
var match;
while((match = rxPropValue.exec(frame.props)) !== null) {
prop = match[1];
value = match[2];
easing = prop.match(rxPropEasing);
//Is there an easing specified for this prop?
if(easing !== null) {
prop = easing[1];
easing = easing[2];
} else {
easing = DEFAULT_EASING;
}
//Exclamation point at first position forces the value to be taken literal.
value = value.indexOf('!') ? _parseProp(value) : [value.slice(1)];
//Save the prop for this key frame with his value and easing function
props[prop] = {
value: value,
easing: easings[easing]
};
}
frame.props = props;
}
};
/**
* Parses a value extracting numeric values and generating a format string
* for later interpolation of the new values in old string.
*
* @param val The CSS value to be parsed.
* @return Something like ["rgba(?%,?%, ?%,?)", 100, 50, 0, .7]
* where the first element is the format string later used
* and all following elements are the numeric value.
*/
var _parseProp = function(val) {
var numbers = [];
//One special case, where floats don't work.
//We replace all occurences of rgba colors
//which don't use percentage notation with the percentage notation.
rxRGBAIntegerColor.lastIndex = 0;
val = val.replace(rxRGBAIntegerColor, function(rgba) {
return rgba.replace(rxNumericValue, function(n) {
return n / 255 * 100 + '%';
});
});
//Handle prefixing of "gradient" values.
//For now only the prefixed value will be set. Unprefixed isn't supported anyway.
if(theDashedCSSPrefix) {
rxGradient.lastIndex = 0;
val = val.replace(rxGradient, function(s) {
return theDashedCSSPrefix + s;
});
}
//Now parse ANY number inside this string and create a format string.
val = val.replace(rxNumericValue, function(n) {
numbers.push(+n);
return '{?}';
});
//Add the formatstring as first value.
numbers.unshift(val);
return numbers;
};
/**
* Fills the key frames with missing left and right hand properties.
* If key frame 1 has property X and key frame 2 is missing X,
* but key frame 3 has X again, then we need to assign X to key frame 2 too.
*
* @param sk A skrollable.
*/
var _fillProps = function(sk) {
//Will collect the properties key frame by key frame
var propList = {};
var keyFrameIndex;
var keyFramesLength;
//Iterate over all key frames from left to right
keyFrameIndex = 0;
keyFramesLength = sk.keyFrames.length;
for(; keyFrameIndex < keyFramesLength; keyFrameIndex++) {
_fillPropForFrame(sk.keyFrames[keyFrameIndex], propList);
}
//Now do the same from right to fill the last gaps
propList = {};
//Iterate over all key frames from right to left
keyFrameIndex = sk.keyFrames.length - 1;
for(; keyFrameIndex >= 0; keyFrameIndex--) {
_fillPropForFrame(sk.keyFrames[keyFrameIndex], propList);
}
};
var _fillPropForFrame = function(frame, propList) {
var key;
//For each key frame iterate over all right hand properties and assign them,
//but only if the current key frame doesn't have the property by itself
for(key in propList) {
//The current frame misses this property, so assign it.
if(!hasProp.call(frame.props, key)) {
frame.props[key] = propList[key];
}
}
//Iterate over all props of the current frame and collect them
for(key in frame.props) {
propList[key] = frame.props[key];
}
};
/**
* Calculates the new values for two given values array.
*/
var _calcInterpolation = function(val1, val2, progress) {
var valueIndex;
var val1Length = val1.length;
//They both need to have the same length
if(val1Length !== val2.length) {
throw 'Can\'t interpolate between "' + val1[0] + '" and "' + val2[0] + '"';
}
//Add the format string as first element.
var interpolated = [val1[0]];
valueIndex = 1;
for(; valueIndex < val1Length; valueIndex++) {
//That's the line where the two numbers are actually interpolated.
interpolated[valueIndex] = val1[valueIndex] + ((val2[valueIndex] - val1[valueIndex]) * progress);
}
return interpolated;
};
/**
* Interpolates the numeric values into the format string.
*/
var _interpolateString = function(val) {
var valueIndex = 1;
rxInterpolateString.lastIndex = 0;
return val[0].replace(rxInterpolateString, function() {
return val[valueIndex++];
});
};
/**
* Resets the class and style attribute to what it was before skrollr manipulated the element.
* Also remembers the values it had before reseting, in order to undo the reset.
*/
var _reset = function(elements, undo) {
//We accept a single element or an array of elements.
elements = [].concat(elements);
var skrollable;
var element;
var elementsIndex = 0;
var elementsLength = elements.length;
for(; elementsIndex < elementsLength; elementsIndex++) {
element = elements[elementsIndex];
skrollable = _skrollables[element[SKROLLABLE_ID_DOM_PROPERTY]];
//Couldn't find the skrollable for this DOM element.
if(!skrollable) {
continue;
}
if(undo) {
//Reset class and style to the "dirty" (set by skrollr) values.
element.style.cssText = skrollable.dirtyStyleAttr;
_updateClass(element, skrollable.dirtyClassAttr);
} else {
//Remember the "dirty" (set by skrollr) class and style.
skrollable.dirtyStyleAttr = element.style.cssText;
skrollable.dirtyClassAttr = _getClass(element);
//Reset class and style to what it originally was.
element.style.cssText = skrollable.styleAttr;
_updateClass(element, skrollable.classAttr);
}
}
};
/**
* Detects support for 3d transforms by applying it to the skrollr-body.
*/
var _detect3DTransforms = function() {
_translateZ = 'translateZ(0)';
skrollr.setStyle(_skrollrBody, 'transform', _translateZ);
var computedStyle = getStyle(_skrollrBody);
var computedTransform = computedStyle.getPropertyValue('transform');
var computedTransformWithPrefix = computedStyle.getPropertyValue(theDashedCSSPrefix + 'transform');
var has3D = (computedTransform && computedTransform !== 'none') || (computedTransformWithPrefix && computedTransformWithPrefix !== 'none');
if(!has3D) {
_translateZ = '';
}
};
/**
* Set the CSS property on the given element. Sets prefixed properties as well.
*/
skrollr.setStyle = function(el, prop, val) {
var style = el.style;
//Camel case.
prop = prop.replace(rxCamelCase, rxCamelCaseFn).replace('-', '');
//Make sure z-index gets a <integer>.
//This is the only <integer> case we need to handle.
if(prop === 'zIndex') {
if(isNaN(val)) {
//If it's not a number, don't touch it.
//It could for example be "auto" (#351).
style[prop] = val;
} else {
//Floor the number.
style[prop] = '' + (val | 0);
}
}
//#64: "float" can't be set across browsers. Needs to use "cssFloat" for all except IE.
else if(prop === 'float') {
style.styleFloat = style.cssFloat = val;
}
else {
//Need try-catch for old IE.
try {
//Set prefixed property if there's a prefix.
if(theCSSPrefix) {
style[theCSSPrefix + prop.slice(0,1).toUpperCase() + prop.slice(1)] = val;
}
//Set unprefixed.
style[prop] = val;
} catch(ignore) {}
}
};
/**
* Cross browser event handling.
*/
var _addEvent = skrollr.addEvent = function(element, names, callback) {
var intermediate = function(e) {
//Normalize IE event stuff.
e = e || window.event;
if(!e.target) {
e.target = e.srcElement;
}
if(!e.preventDefault) {
e.preventDefault = function() {
e.returnValue = false;
e.defaultPrevented = true;
};
}
return callback.call(this, e);
};
names = names.split(' ');
var name;
var nameCounter = 0;
var namesLength = names.length;
for(; nameCounter < namesLength; nameCounter++) {
name = names[nameCounter];
if(element.addEventListener) {
element.addEventListener(name, callback, false);
} else {
element.attachEvent('on' + name, intermediate);
}
//Remember the events to be able to flush them later.
_registeredEvents.push({
element: element,
name: name,
listener: callback
});
}
};
var _removeEvent = skrollr.removeEvent = function(element, names, callback) {
names = names.split(' ');
var nameCounter = 0;
var namesLength = names.length;
for(; nameCounter < namesLength; nameCounter++) {
if(element.removeEventListener) {
element.removeEventListener(names[nameCounter], callback, false);
} else {
element.detachEvent('on' + names[nameCounter], callback);
}
}
};
var _removeAllEvents = function() {
var eventData;
var eventCounter = 0;
var eventsLength = _registeredEvents.length;
for(; eventCounter < eventsLength; eventCounter++) {
eventData = _registeredEvents[eventCounter];
_removeEvent(eventData.element, eventData.name, eventData.listener);
}
_registeredEvents = [];
};
var _emitEvent = function(element, name, direction) {
if(_listeners.keyframe) {
_listeners.keyframe.call(_instance, element, name, direction);
}
};
var _reflow = function() {
var pos = _instance.getScrollTop();
//Will be recalculated by _updateDependentKeyFrames.
_maxKeyFrame = 0;
if(_forceHeight && !_isMobile) {
//un-"force" the height to not mess with the calculations in _updateDependentKeyFrames (#216).
body.style.height = '';
}
_updateDependentKeyFrames();
if(_forceHeight && !_isMobile) {
//"force" the height.
body.style.height = (_maxKeyFrame + documentElement.clientHeight) + 'px';
}
//The scroll offset may now be larger than needed (on desktop the browser/os prevents scrolling farther than the bottom).
if(_isMobile) {
_instance.setScrollTop(Math.min(_instance.getScrollTop(), _maxKeyFrame));
} else {
//Remember and reset the scroll pos (#217).
_instance.setScrollTop(pos, true);
}
_forceRender = true;
};
/*
* Returns a copy of the constants object where all functions and strings have been evaluated.
*/
var _processConstants = function() {
var viewportHeight = documentElement.clientHeight;
var copy = {};
var prop;
var value;
for(prop in _constants) {
value = _constants[prop];
if(typeof value === 'function') {
value = value.call(_instance);
}
//Percentage offset.
else if((/p$/).test(value)) {
value = (value.slice(0, -1) / 100) * viewportHeight;
}
copy[prop] = value;
}
return copy;
};
/*
* Returns the height of the document.
*/
var _getDocumentHeight = function() {
var skrollrBodyHeight = (_skrollrBody && _skrollrBody.offsetHeight || 0);
var bodyHeight = Math.max(skrollrBodyHeight, body.scrollHeight, body.offsetHeight, documentElement.scrollHeight, documentElement.offsetHeight, documentElement.clientHeight);
return bodyHeight - documentElement.clientHeight;
};
/**
* Returns a string of space separated classnames for the current element.
* Works with SVG as well.
*/
var _getClass = function(element) {
var prop = 'className';
//SVG support by using className.baseVal instead of just className.
if(window.SVGElement && element instanceof window.SVGElement) {
element = element[prop];
prop = 'baseVal';
}
return element[prop];
};
/**
* Adds and removes a CSS classes.
* Works with SVG as well.
* add and remove are arrays of strings,
* or if remove is ommited add is a string and overwrites all classes.
*/
var _updateClass = function(element, add, remove) {
var prop = 'className';
//SVG support by using className.baseVal instead of just className.
if(window.SVGElement && element instanceof window.SVGElement) {
element = element[prop];
prop = 'baseVal';
}
//When remove is ommited, we want to overwrite/set the classes.
if(remove === undefined) {
element[prop] = add;
return;
}
//Cache current classes. We will work on a string before passing back to DOM.
var val = element[prop];
//All classes to be removed.
var classRemoveIndex = 0;
var removeLength = remove.length;
for(; classRemoveIndex < removeLength; classRemoveIndex++) {
val = _untrim(val).replace(_untrim(remove[classRemoveIndex]), ' ');
}
val = _trim(val);
//All classes to be added.
var classAddIndex = 0;
var addLength = add.length;
for(; classAddIndex < addLength; classAddIndex++) {
//Only add if el not already has class.
if(_untrim(val).indexOf(_untrim(add[classAddIndex])) === -1) {
val += ' ' + add[classAddIndex];
}
}
element[prop] = _trim(val);
};
var _trim = function(a) {
return a.replace(rxTrim, '');
};
/**
* Adds a space before and after the string.
*/
var _untrim = function(a) {
return ' ' + a + ' ';
};
var _now = Date.now || function() {
return +new Date();
};
var _keyFrameComparator = function(a, b) {
return a.frame - b.frame;
};
/*
* Private variables.
*/
//Singleton
var _instance;
/*
A list of all elements which should be animated associated with their the metadata.
Exmaple skrollable with two key frames animating from 100px width to 20px:
skrollable = {
element: <the DOM element>,
styleAttr: <style attribute of the element before skrollr>,
classAttr: <class attribute of the element before skrollr>,
keyFrames: [
{
frame: 100,
props: {
width: {
value: ['{?}px', 100],
easing: <reference to easing function>
}
},
mode: "absolute"
},
{
frame: 200,
props: {
width: {
value: ['{?}px', 20],
easing: <reference to easing function>
}
},
mode: "absolute"
}
]
};
*/
var _skrollables;
var _skrollrBody;
var _listeners;
var _forceHeight;
var _maxKeyFrame = 0;
var _scale = 1;
var _constants;
var _mobileDeceleration;
//Current direction (up/down).
var _direction = 'down';
//The last top offset value. Needed to determine direction.
var _lastTop = -1;
//The last time we called the render method (doesn't mean we rendered!).
var _lastRenderCall = _now();
//For detecting if it actually resized (#271).
var _lastViewportWidth = 0;
var _lastViewportHeight = 0;
var _requestReflow = false;
//Will contain data about a running scrollbar animation, if any.
var _scrollAnimation;
var _smoothScrollingEnabled;
var _smoothScrollingDuration;
//Will contain settins for smooth scrolling if enabled.
var _smoothScrolling;
//Can be set by any operation/event to force rendering even if the scrollbar didn't move.
var _forceRender;
//Each skrollable gets an unique ID incremented for each skrollable.
//The ID is the index in the _skrollables array.
var _skrollableIdCounter = 0;
var _edgeStrategy;
//Mobile specific vars. Will be stripped by UglifyJS when not in use.
var _isMobile = false;
//The virtual scroll offset when using mobile scrolling.
var _mobileOffset = 0;
//If the browser supports 3d transforms, this will be filled with 'translateZ(0)' (empty string otherwise).
var _translateZ;
//Will contain data about registered events by skrollr.
var _registeredEvents = [];
//Animation frame id returned by RequestAnimationFrame (or timeout when RAF is not supported).
var _animFrame;
//Expose skrollr as either a global variable or a require.js module
if(typeof define === 'function' && define.amd) {
define('skrollr', function () {
return skrollr;
});
} else if (typeof module !== 'undefined' && module.exports) {
module.exports = skrollr;
} else {
window.skrollr = skrollr;
}
}(window, document));