mirror of https://github.com/Ombi-app/Ombi
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
559 lines
20 KiB
559 lines
20 KiB
/*
|
|
* ScrollToFixed
|
|
* https://github.com/bigspotteddog/ScrollToFixed
|
|
*
|
|
* Copyright (c) 2011 Joseph Cava-Lynch
|
|
* MIT license
|
|
*/
|
|
(function($) {
|
|
$.isScrollToFixed = function(el) {
|
|
return !!$(el).data('ScrollToFixed');
|
|
};
|
|
|
|
$.ScrollToFixed = function(el, options) {
|
|
// To avoid scope issues, use 'base' instead of 'this' to reference this
|
|
// class from internal events and functions.
|
|
var base = this;
|
|
|
|
// Access to jQuery and DOM versions of element.
|
|
base.$el = $(el);
|
|
base.el = el;
|
|
|
|
// Add a reverse reference to the DOM object.
|
|
base.$el.data('ScrollToFixed', base);
|
|
|
|
// A flag so we know if the scroll has been reset.
|
|
var isReset = false;
|
|
|
|
// The element that was given to us to fix if scrolled above the top of
|
|
// the page.
|
|
var target = base.$el;
|
|
|
|
var position;
|
|
var originalPosition;
|
|
var originalOffsetTop;
|
|
var originalZIndex;
|
|
|
|
// The offset top of the element when resetScroll was called. This is
|
|
// used to determine if we have scrolled past the top of the element.
|
|
var offsetTop = 0;
|
|
|
|
// The offset left of the element when resetScroll was called. This is
|
|
// used to move the element left or right relative to the horizontal
|
|
// scroll.
|
|
var offsetLeft = 0;
|
|
var originalOffsetLeft = -1;
|
|
|
|
// This last offset used to move the element horizontally. This is used
|
|
// to determine if we need to move the element because we would not want
|
|
// to do that for no reason.
|
|
var lastOffsetLeft = -1;
|
|
|
|
// This is the element used to fill the void left by the target element
|
|
// when it goes fixed; otherwise, everything below it moves up the page.
|
|
var spacer = null;
|
|
|
|
var spacerClass;
|
|
|
|
var className;
|
|
|
|
// Capture the original offsets for the target element. This needs to be
|
|
// called whenever the page size changes or when the page is first
|
|
// scrolled. For some reason, calling this before the page is first
|
|
// scrolled causes the element to become fixed too late.
|
|
function resetScroll() {
|
|
// Set the element to it original positioning.
|
|
target.trigger('preUnfixed.ScrollToFixed');
|
|
setUnfixed();
|
|
target.trigger('unfixed.ScrollToFixed');
|
|
|
|
// Reset the last offset used to determine if the page has moved
|
|
// horizontally.
|
|
lastOffsetLeft = -1;
|
|
|
|
// Capture the offset top of the target element.
|
|
offsetTop = target.offset().top;
|
|
|
|
// Capture the offset left of the target element.
|
|
offsetLeft = target.offset().left;
|
|
|
|
// If the offsets option is on, alter the left offset.
|
|
if (base.options.offsets) {
|
|
offsetLeft += (target.offset().left - target.position().left);
|
|
}
|
|
|
|
if (originalOffsetLeft == -1) {
|
|
originalOffsetLeft = offsetLeft;
|
|
}
|
|
|
|
position = target.css('position');
|
|
|
|
// Set that this has been called at least once.
|
|
isReset = true;
|
|
|
|
if (base.options.bottom != -1) {
|
|
target.trigger('preFixed.ScrollToFixed');
|
|
setFixed();
|
|
target.trigger('fixed.ScrollToFixed');
|
|
}
|
|
}
|
|
|
|
function getLimit() {
|
|
var limit = base.options.limit;
|
|
if (!limit) return 0;
|
|
|
|
if (typeof(limit) === 'function') {
|
|
return limit.apply(target);
|
|
}
|
|
return limit;
|
|
}
|
|
|
|
// Returns whether the target element is fixed or not.
|
|
function isFixed() {
|
|
return position === 'fixed';
|
|
}
|
|
|
|
// Returns whether the target element is absolute or not.
|
|
function isAbsolute() {
|
|
return position === 'absolute';
|
|
}
|
|
|
|
function isUnfixed() {
|
|
return !(isFixed() || isAbsolute());
|
|
}
|
|
|
|
// Sets the target element to fixed. Also, sets the spacer to fill the
|
|
// void left by the target element.
|
|
function setFixed() {
|
|
// Only fix the target element and the spacer if we need to.
|
|
if (!isFixed()) {
|
|
// Set the spacer to fill the height and width of the target
|
|
// element, then display it.
|
|
spacer.css({
|
|
'display' : target.css('display'),
|
|
'width' : target.outerWidth(true),
|
|
'height' : target.outerHeight(true),
|
|
'float' : target.css('float')
|
|
});
|
|
|
|
// Set the target element to fixed and set its width so it does
|
|
// not fill the rest of the page horizontally. Also, set its top
|
|
// to the margin top specified in the options.
|
|
|
|
cssOptions={
|
|
'z-index' : base.options.zIndex,
|
|
'position' : 'fixed',
|
|
'top' : base.options.bottom == -1?getMarginTop():'',
|
|
'bottom' : base.options.bottom == -1?'':base.options.bottom,
|
|
'margin-left' : '0px'
|
|
}
|
|
if (!base.options.dontSetWidth){ cssOptions['width']=target.width(); };
|
|
|
|
target.css(cssOptions);
|
|
|
|
target.addClass(base.options.baseClassName);
|
|
|
|
if (base.options.className) {
|
|
target.addClass(base.options.className);
|
|
}
|
|
|
|
position = 'fixed';
|
|
}
|
|
}
|
|
|
|
function setAbsolute() {
|
|
|
|
var top = getLimit();
|
|
var left = offsetLeft;
|
|
|
|
if (base.options.removeOffsets) {
|
|
left = '';
|
|
top = top - offsetTop;
|
|
}
|
|
|
|
cssOptions={
|
|
'position' : 'absolute',
|
|
'top' : top,
|
|
'left' : left,
|
|
'margin-left' : '0px',
|
|
'bottom' : ''
|
|
}
|
|
if (!base.options.dontSetWidth){ cssOptions['width']=target.width(); };
|
|
|
|
target.css(cssOptions);
|
|
|
|
position = 'absolute';
|
|
}
|
|
|
|
// Sets the target element back to unfixed. Also, hides the spacer.
|
|
function setUnfixed() {
|
|
// Only unfix the target element and the spacer if we need to.
|
|
if (!isUnfixed()) {
|
|
lastOffsetLeft = -1;
|
|
|
|
// Hide the spacer now that the target element will fill the
|
|
// space.
|
|
spacer.css('display', 'none');
|
|
|
|
// Remove the style attributes that were added to the target.
|
|
// This will reverse the target back to the its original style.
|
|
target.css({
|
|
'z-index' : originalZIndex,
|
|
'width' : '',
|
|
'position' : originalPosition,
|
|
'left' : '',
|
|
'top' : originalOffsetTop,
|
|
'margin-left' : ''
|
|
});
|
|
|
|
target.removeClass('scroll-to-fixed-fixed');
|
|
|
|
if (base.options.className) {
|
|
target.removeClass(base.options.className);
|
|
}
|
|
|
|
position = null;
|
|
}
|
|
}
|
|
|
|
// Moves the target element left or right relative to the horizontal
|
|
// scroll position.
|
|
function setLeft(x) {
|
|
// Only if the scroll is not what it was last time we did this.
|
|
if (x != lastOffsetLeft) {
|
|
// Move the target element horizontally relative to its original
|
|
// horizontal position.
|
|
target.css('left', offsetLeft - x);
|
|
|
|
// Hold the last horizontal position set.
|
|
lastOffsetLeft = x;
|
|
}
|
|
}
|
|
|
|
function getMarginTop() {
|
|
var marginTop = base.options.marginTop;
|
|
if (!marginTop) return 0;
|
|
|
|
if (typeof(marginTop) === 'function') {
|
|
return marginTop.apply(target);
|
|
}
|
|
return marginTop;
|
|
}
|
|
|
|
// Checks to see if we need to do something based on new scroll position
|
|
// of the page.
|
|
function checkScroll() {
|
|
if (!$.isScrollToFixed(target)) return;
|
|
var wasReset = isReset;
|
|
|
|
// If resetScroll has not yet been called, call it. This only
|
|
// happens once.
|
|
if (!isReset) {
|
|
resetScroll();
|
|
} else if (isUnfixed()) {
|
|
// if the offset has changed since the last scroll,
|
|
// we need to get it again.
|
|
|
|
// Capture the offset top of the target element.
|
|
offsetTop = target.offset().top;
|
|
|
|
// Capture the offset left of the target element.
|
|
offsetLeft = target.offset().left;
|
|
}
|
|
|
|
// Grab the current horizontal scroll position.
|
|
var x = $(window).scrollLeft();
|
|
|
|
// Grab the current vertical scroll position.
|
|
var y = $(window).scrollTop();
|
|
|
|
// Get the limit, if there is one.
|
|
var limit = getLimit();
|
|
|
|
// If the vertical scroll position, plus the optional margin, would
|
|
// put the target element at the specified limit, set the target
|
|
// element to absolute.
|
|
if (base.options.minWidth && $(window).width() < base.options.minWidth) {
|
|
if (!isUnfixed() || !wasReset) {
|
|
postPosition();
|
|
target.trigger('preUnfixed.ScrollToFixed');
|
|
setUnfixed();
|
|
target.trigger('unfixed.ScrollToFixed');
|
|
}
|
|
} else if (base.options.maxWidth && $(window).width() > base.options.maxWidth) {
|
|
if (!isUnfixed() || !wasReset) {
|
|
postPosition();
|
|
target.trigger('preUnfixed.ScrollToFixed');
|
|
setUnfixed();
|
|
target.trigger('unfixed.ScrollToFixed');
|
|
}
|
|
} else if (base.options.bottom == -1) {
|
|
// If the vertical scroll position, plus the optional margin, would
|
|
// put the target element at the specified limit, set the target
|
|
// element to absolute.
|
|
if (limit > 0 && y >= limit - getMarginTop()) {
|
|
if (!isAbsolute() || !wasReset) {
|
|
postPosition();
|
|
target.trigger('preAbsolute.ScrollToFixed');
|
|
setAbsolute();
|
|
target.trigger('unfixed.ScrollToFixed');
|
|
}
|
|
// If the vertical scroll position, plus the optional margin, would
|
|
// put the target element above the top of the page, set the target
|
|
// element to fixed.
|
|
} else if (y >= offsetTop - getMarginTop()) {
|
|
if (!isFixed() || !wasReset) {
|
|
postPosition();
|
|
target.trigger('preFixed.ScrollToFixed');
|
|
|
|
// Set the target element to fixed.
|
|
setFixed();
|
|
|
|
// Reset the last offset left because we just went fixed.
|
|
lastOffsetLeft = -1;
|
|
|
|
target.trigger('fixed.ScrollToFixed');
|
|
}
|
|
// If the page has been scrolled horizontally as well, move the
|
|
// target element accordingly.
|
|
setLeft(x);
|
|
} else {
|
|
// Set the target element to unfixed, placing it where it was
|
|
// before.
|
|
if (!isUnfixed() || !wasReset) {
|
|
postPosition();
|
|
target.trigger('preUnfixed.ScrollToFixed');
|
|
setUnfixed();
|
|
target.trigger('unfixed.ScrollToFixed');
|
|
}
|
|
}
|
|
} else {
|
|
if (limit > 0) {
|
|
if (y + $(window).height() - target.outerHeight(true) >= limit - (getMarginTop() || -getBottom())) {
|
|
if (isFixed()) {
|
|
postPosition();
|
|
target.trigger('preUnfixed.ScrollToFixed');
|
|
|
|
if (originalPosition === 'absolute') {
|
|
setAbsolute();
|
|
} else {
|
|
setUnfixed();
|
|
}
|
|
|
|
target.trigger('unfixed.ScrollToFixed');
|
|
}
|
|
} else {
|
|
if (!isFixed()) {
|
|
postPosition();
|
|
target.trigger('preFixed.ScrollToFixed');
|
|
setFixed();
|
|
}
|
|
setLeft(x);
|
|
target.trigger('fixed.ScrollToFixed');
|
|
}
|
|
} else {
|
|
setLeft(x);
|
|
}
|
|
}
|
|
}
|
|
|
|
function getBottom() {
|
|
if (!base.options.bottom) return 0;
|
|
return base.options.bottom;
|
|
}
|
|
|
|
function postPosition() {
|
|
var position = target.css('position');
|
|
|
|
if (position == 'absolute') {
|
|
target.trigger('postAbsolute.ScrollToFixed');
|
|
} else if (position == 'fixed') {
|
|
target.trigger('postFixed.ScrollToFixed');
|
|
} else {
|
|
target.trigger('postUnfixed.ScrollToFixed');
|
|
}
|
|
}
|
|
|
|
var windowResize = function(event) {
|
|
// Check if the element is visible before updating it's position, which
|
|
// improves behavior with responsive designs where this element is hidden.
|
|
if(target.is(':visible')) {
|
|
isReset = false;
|
|
checkScroll();
|
|
}
|
|
}
|
|
|
|
var windowScroll = function(event) {
|
|
(!!window.requestAnimationFrame) ? requestAnimationFrame(checkScroll) : checkScroll();
|
|
}
|
|
|
|
// From: http://kangax.github.com/cft/#IS_POSITION_FIXED_SUPPORTED
|
|
var isPositionFixedSupported = function() {
|
|
var container = document.body;
|
|
|
|
if (document.createElement && container && container.appendChild && container.removeChild) {
|
|
var el = document.createElement('div');
|
|
|
|
if (!el.getBoundingClientRect) return null;
|
|
|
|
el.innerHTML = 'x';
|
|
el.style.cssText = 'position:fixed;top:100px;';
|
|
container.appendChild(el);
|
|
|
|
var originalHeight = container.style.height,
|
|
originalScrollTop = container.scrollTop;
|
|
|
|
container.style.height = '3000px';
|
|
container.scrollTop = 500;
|
|
|
|
var elementTop = el.getBoundingClientRect().top;
|
|
container.style.height = originalHeight;
|
|
|
|
var isSupported = (elementTop === 100);
|
|
container.removeChild(el);
|
|
container.scrollTop = originalScrollTop;
|
|
|
|
return isSupported;
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
var preventDefault = function(e) {
|
|
e = e || window.event;
|
|
if (e.preventDefault) {
|
|
e.preventDefault();
|
|
}
|
|
e.returnValue = false;
|
|
}
|
|
|
|
// Initializes this plugin. Captures the options passed in, turns this
|
|
// off for devices that do not support fixed position, adds the spacer,
|
|
// and binds to the window scroll and resize events.
|
|
base.init = function() {
|
|
// Capture the options for this plugin.
|
|
base.options = $.extend({}, $.ScrollToFixed.defaultOptions, options);
|
|
|
|
originalZIndex = target.css('z-index')
|
|
|
|
// Turn off this functionality for devices that do not support it.
|
|
// if (!(base.options && base.options.dontCheckForPositionFixedSupport)) {
|
|
// var fixedSupported = isPositionFixedSupported();
|
|
// if (!fixedSupported) return;
|
|
// }
|
|
|
|
// Put the target element on top of everything that could be below
|
|
// it. This reduces flicker when the target element is transitioning
|
|
// to fixed.
|
|
base.$el.css('z-index', base.options.zIndex);
|
|
|
|
// Create a spacer element to fill the void left by the target
|
|
// element when it goes fixed.
|
|
spacer = $('<div />');
|
|
|
|
position = target.css('position');
|
|
originalPosition = target.css('position');
|
|
|
|
originalOffsetTop = target.css('top');
|
|
|
|
// Place the spacer right after the target element.
|
|
if (isUnfixed()) base.$el.after(spacer);
|
|
|
|
// Reset the target element offsets when the window is resized, then
|
|
// check to see if we need to fix or unfix the target element.
|
|
$(window).bind('resize.ScrollToFixed', windowResize);
|
|
|
|
// When the window scrolls, check to see if we need to fix or unfix
|
|
// the target element.
|
|
$(window).bind('scroll.ScrollToFixed', windowScroll);
|
|
|
|
// For touch devices, call checkScroll directlly rather than
|
|
// rAF wrapped windowScroll to animate the element
|
|
if ('ontouchmove' in window) {
|
|
$(window).bind('touchmove.ScrollToFixed', checkScroll);
|
|
}
|
|
|
|
if (base.options.preFixed) {
|
|
target.bind('preFixed.ScrollToFixed', base.options.preFixed);
|
|
}
|
|
if (base.options.postFixed) {
|
|
target.bind('postFixed.ScrollToFixed', base.options.postFixed);
|
|
}
|
|
if (base.options.preUnfixed) {
|
|
target.bind('preUnfixed.ScrollToFixed', base.options.preUnfixed);
|
|
}
|
|
if (base.options.postUnfixed) {
|
|
target.bind('postUnfixed.ScrollToFixed', base.options.postUnfixed);
|
|
}
|
|
if (base.options.preAbsolute) {
|
|
target.bind('preAbsolute.ScrollToFixed', base.options.preAbsolute);
|
|
}
|
|
if (base.options.postAbsolute) {
|
|
target.bind('postAbsolute.ScrollToFixed', base.options.postAbsolute);
|
|
}
|
|
if (base.options.fixed) {
|
|
target.bind('fixed.ScrollToFixed', base.options.fixed);
|
|
}
|
|
if (base.options.unfixed) {
|
|
target.bind('unfixed.ScrollToFixed', base.options.unfixed);
|
|
}
|
|
|
|
if (base.options.spacerClass) {
|
|
spacer.addClass(base.options.spacerClass);
|
|
}
|
|
|
|
target.bind('resize.ScrollToFixed', function() {
|
|
spacer.height(target.height());
|
|
});
|
|
|
|
target.bind('scroll.ScrollToFixed', function() {
|
|
target.trigger('preUnfixed.ScrollToFixed');
|
|
setUnfixed();
|
|
target.trigger('unfixed.ScrollToFixed');
|
|
checkScroll();
|
|
});
|
|
|
|
target.bind('detach.ScrollToFixed', function(ev) {
|
|
preventDefault(ev);
|
|
|
|
target.trigger('preUnfixed.ScrollToFixed');
|
|
setUnfixed();
|
|
target.trigger('unfixed.ScrollToFixed');
|
|
|
|
$(window).unbind('resize.ScrollToFixed', windowResize);
|
|
$(window).unbind('scroll.ScrollToFixed', windowScroll);
|
|
|
|
target.unbind('.ScrollToFixed');
|
|
|
|
//remove spacer from dom
|
|
spacer.remove();
|
|
|
|
base.$el.removeData('ScrollToFixed');
|
|
});
|
|
|
|
// Reset everything.
|
|
windowResize();
|
|
};
|
|
|
|
// Initialize the plugin.
|
|
base.init();
|
|
};
|
|
|
|
// Sets the option defaults.
|
|
$.ScrollToFixed.defaultOptions = {
|
|
marginTop : 0,
|
|
limit : 0,
|
|
bottom : -1,
|
|
zIndex : 1000,
|
|
baseClassName: 'scroll-to-fixed-fixed'
|
|
};
|
|
|
|
// Returns enhanced elements that will fix to the top of the page when the
|
|
// page is scrolled.
|
|
$.fn.scrollToFixed = function(options) {
|
|
return this.each(function() {
|
|
(new $.ScrollToFixed(this, options));
|
|
});
|
|
};
|
|
})(jQuery);
|