/*
* By Elementor Team
*/
( function( $ ) {
var Sticky = function( element, userSettings ) {
var $element,
isSticky = false,
isFollowingParent = false,
isReachedEffectsPoint = false,
elements = {},
settings,
elementOffsetValue,
elementWidth;
var defaultSettings = {
to: 'top',
offset: 0,
effectsOffset: 0,
parent: false,
classes: {
sticky: 'sticky',
stickyActive: 'sticky-active',
stickyEffects: 'sticky-effects',
spacer: 'sticky-spacer',
},
isRTL: false,
isScrollSnapActive: false,
handleScrollbarWidth: false,
};
var initElements = function() {
$element = $( element ).addClass( settings.classes.sticky );
elements.$window = $( window );
elements.$body = $( document ).find( 'body' );
if ( settings.parent ) {
elements.$parent = $element.parent();
if ( 'parent' !== settings.parent ) {
elements.$parent = elements.$parent.closest( settings.parent );
}
}
};
var initSettings = function() {
settings = jQuery.extend( true, defaultSettings, userSettings );
};
var bindEvents = function() {
elements.$window.on( 'resize', onWindowResize );
if ( settings.isScrollSnapActive ) {
elements.$body.on( 'scroll', onWindowScroll );
} else {
elements.$window.on( 'scroll', onWindowScroll );
}
};
var unbindEvents = function() {
elements.$window
.off( 'scroll', onWindowScroll )
.off( 'resize', onWindowResize );
elements.$body.off( 'scroll', onWindowScroll );
};
var init = function() {
initSettings();
initElements();
bindEvents();
checkPosition();
};
var backupCSS = function( $elementBackupCSS, backupState, properties ) {
var css = {},
elementStyle = $elementBackupCSS[ 0 ].style;
properties.forEach( function( property ) {
css[ property ] = undefined !== elementStyle[ property ] ? elementStyle[ property ] : '';
} );
$elementBackupCSS.data( 'css-backup-' + backupState, css );
};
var getCSSBackup = function( $elementCSSBackup, backupState ) {
return $elementCSSBackup.data( 'css-backup-' + backupState );
};
const updateElementSizesData = () => {
elementWidth = getElementOuterSize( $element, 'width' );
elementOffsetValue = $element.offset().left;
if ( settings.isRTL ) {
// `window.innerWidth` includes the scrollbar while `document.body.offsetWidth` doesn't.
const documentWidth = settings.handleScrollbarWidth ? window.innerWidth : document.body.offsetWidth;
elementOffsetValue = Math.max( documentWidth - elementWidth - elementOffsetValue, 0 );
}
}
var addSpacer = function() {
elements.$spacer = $element.clone()
.addClass( settings.classes.spacer )
.css( {
visibility: 'hidden',
transition: 'none',
animation: 'none',
} );
$element.after( elements.$spacer );
};
var removeSpacer = function() {
elements.$spacer.remove();
};
var stickElement = function() {
backupCSS( $element, 'unsticky', [ 'position', 'width', 'margin-top', 'margin-bottom', 'top', 'bottom', 'inset-inline-start' ] );
const css = {
position: 'fixed',
width: elementWidth,
marginTop: 0,
marginBottom: 0,
};
css[ settings.to ] = settings.offset;
css[ 'top' === settings.to ? 'bottom' : 'top' ] = '';
if ( elementOffsetValue ) {
css[ 'inset-inline-start' ] = elementOffsetValue + 'px';
}
$element
.css( css )
.addClass( settings.classes.stickyActive );
};
var unstickElement = function() {
$element
.css( getCSSBackup( $element, 'unsticky' ) )
.removeClass( settings.classes.stickyActive );
};
var followParent = function() {
backupCSS( elements.$parent, 'childNotFollowing', [ 'position' ] );
elements.$parent.css( 'position', 'relative' );
backupCSS( $element, 'notFollowing', [ 'position', 'inset-inline-start', 'top', 'bottom' ] );
const css = {
position: 'absolute',
};
elementOffsetValue = elements.$spacer.position().left;
if ( settings.isRTL ) {
const parentWidth = $element.parent().outerWidth(),
elementOffsetValueLeft = elements.$spacer.position().left;
elementWidth = elements.$spacer.outerWidth();
elementOffsetValue = Math.max( parentWidth - elementWidth - elementOffsetValueLeft, 0 );
}
css[ 'inset-inline-start' ] = elementOffsetValue + 'px';
css[ settings.to ] = '';
css[ 'top' === settings.to ? 'bottom' : 'top' ] = 0;
$element.css( css );
isFollowingParent = true;
};
var unfollowParent = function() {
elements.$parent.css( getCSSBackup( elements.$parent, 'childNotFollowing' ) );
$element.css( getCSSBackup( $element, 'notFollowing' ) );
isFollowingParent = false;
};
var getElementOuterSize = function( $elementOuterSize, dimension, includeMargins ) {
var computedStyle = getComputedStyle( $elementOuterSize[ 0 ] ),
elementSize = parseFloat( computedStyle[ dimension ] ),
sides = 'height' === dimension ? [ 'top', 'bottom' ] : [ 'left', 'right' ],
propertiesToAdd = [];
if ( 'border-box' !== computedStyle.boxSizing ) {
propertiesToAdd.push( 'border', 'padding' );
}
if ( includeMargins ) {
propertiesToAdd.push( 'margin' );
}
propertiesToAdd.forEach( function( property ) {
sides.forEach( function( side ) {
elementSize += parseFloat( computedStyle[ property + '-' + side ] );
} );
} );
return elementSize;
};
var getElementViewportOffset = function( $elementViewportOffset ) {
var windowScrollTop = elements.$window.scrollTop(),
elementHeight = getElementOuterSize( $elementViewportOffset, 'height' ),
viewportHeight = innerHeight,
elementOffsetFromTop = $elementViewportOffset.offset().top,
distanceFromTop = elementOffsetFromTop - windowScrollTop,
topFromBottom = distanceFromTop - viewportHeight;
return {
top: {
fromTop: distanceFromTop,
fromBottom: topFromBottom,
},
bottom: {
fromTop: distanceFromTop + elementHeight,
fromBottom: topFromBottom + elementHeight,
},
};
};
var stick = function() {
updateElementSizesData();
addSpacer();
stickElement();
isSticky = true;
$element.trigger( 'sticky:stick' );
};
var unstick = function() {
unstickElement();
removeSpacer();
isSticky = false;
$element.trigger( 'sticky:unstick' );
};
var checkParent = function() {
var elementOffset = getElementViewportOffset( $element ),
isTop = 'top' === settings.to;
if ( isFollowingParent ) {
var isNeedUnfollowing = isTop ? elementOffset.top.fromTop > settings.offset : elementOffset.bottom.fromBottom < -settings.offset;
if ( isNeedUnfollowing ) {
unfollowParent();
}
} else {
var parentOffset = getElementViewportOffset( elements.$parent ),
parentStyle = getComputedStyle( elements.$parent[ 0 ] ),
borderWidthToDecrease = parseFloat( parentStyle[ isTop ? 'borderBottomWidth' : 'borderTopWidth' ] ),
parentViewportDistance = isTop ? parentOffset.bottom.fromTop - borderWidthToDecrease : parentOffset.top.fromBottom + borderWidthToDecrease,
isNeedFollowing = isTop ? parentViewportDistance <= elementOffset.bottom.fromTop : parentViewportDistance >= elementOffset.top.fromBottom;
if ( isNeedFollowing ) {
followParent();
}
}
};
var checkEffectsPoint = function( distanceFromTriggerPoint ) {
if ( isReachedEffectsPoint && -distanceFromTriggerPoint < settings.effectsOffset ) {
$element.removeClass( settings.classes.stickyEffects );
isReachedEffectsPoint = false;
} else if ( ! isReachedEffectsPoint && -distanceFromTriggerPoint >= settings.effectsOffset ) {
$element.addClass( settings.classes.stickyEffects );
isReachedEffectsPoint = true;
}
};
var checkPosition = function() {
var offset = settings.offset,
distanceFromTriggerPoint;
if ( isSticky ) {
var spacerViewportOffset = getElementViewportOffset( elements.$spacer );
distanceFromTriggerPoint = 'top' === settings.to ? spacerViewportOffset.top.fromTop - offset : -spacerViewportOffset.bottom.fromBottom - offset;
if ( settings.parent ) {
checkParent();
}
if ( distanceFromTriggerPoint > 0 ) {
unstick();
}
} else {
var elementViewportOffset = getElementViewportOffset( $element );
distanceFromTriggerPoint = 'top' === settings.to ? elementViewportOffset.top.fromTop - offset : -elementViewportOffset.bottom.fromBottom - offset;
if ( distanceFromTriggerPoint <= 0 ) {
stick();
if ( settings.parent ) {
checkParent();
}
}
}
checkEffectsPoint( distanceFromTriggerPoint );
};
var onWindowScroll = function() {
checkPosition();
};
var onWindowResize = function() {
if ( ! isSticky ) {
return;
}
unstickElement();
removeSpacer();
updateElementSizesData();
addSpacer();
stickElement();
if ( settings.parent ) {
// Force recalculation of the relation between the element and its parent.
isFollowingParent = false;
checkParent();
}
};
this.destroy = function() {
if ( isSticky ) {
unstick();
}
unbindEvents();
$element.removeClass( settings.classes.sticky );
};
init();
};
$.fn.sticky = function( settings ) {
var isCommand = 'string' === typeof settings;
this.each( function() {
var $this = $( this );
if ( ! isCommand ) {
$this.data( 'sticky', new Sticky( this, settings ) );
return;
}
var instance = $this.data( 'sticky' );
if ( ! instance ) {
throw Error( 'Trying to perform the `' + settings + '` method prior to initialization' );
}
if ( ! instance[ settings ] ) {
throw ReferenceError( 'Method `' + settings + '` not found in sticky instance' );
}
instance[ settings ].apply( instance, Array.prototype.slice.call( arguments, 1 ) );
if ( 'destroy' === settings ) {
$this.removeData( 'sticky' );
}
} );
return this;
};
window.Sticky = Sticky;
} )( jQuery );