/* global screenReaderText */
/**
* Theme functions file.
*
* Contains handlers for navigation and widget area.
*/
( function( $ ) {
var $body, $window, $sidebar, adminbarOffset, top = false,
bottom = false, windowWidth, windowHeight, lastWindowPos = 0,
topOffset = 0, bodyHeight, sidebarHeight, resizeTimer,
secondary, button;
function initMainNavigation( container ) {
// Add dropdown toggle that display child menu items.
container.find( '.menu-item-has-children > a' ).after( '<button class="dropdown-toggle" aria-expanded="false">' + screenReaderText.expand + '</button>' );
// Toggle buttons and submenu items with active children menu items.
container.find( '.current-menu-ancestor > button' ).addClass( 'toggle-on' );
container.find( '.current-menu-ancestor > .sub-menu' ).addClass( 'toggled-on' );
container.find( '.dropdown-toggle' ).click( function( e ) {
var _this = $( this );
e.preventDefault();
_this.toggleClass( 'toggle-on' );
_this.next( '.children, .sub-menu' ).toggleClass( 'toggled-on' );
_this.attr( 'aria-expanded', _this.attr( 'aria-expanded' ) === 'false' ? 'true' : 'false' );
_this.html( _this.html() === screenReaderText.expand ? screenReaderText.collapse : screenReaderText.expand );
} );
}
initMainNavigation( $( '.main-navigation' ) );
// Re-initialize the main navigation when it is updated, persisting any existing submenu expanded states.
$( document ).on( 'customize-preview-menu-refreshed', function( e, params ) {
if ( 'primary' === params.wpNavMenuArgs.theme_location ) {
initMainNavigation( params.newContainer );
// Re-sync expanded states from oldContainer.
params.oldContainer.find( '.dropdown-toggle.toggle-on' ).each(function() {
var containerId = $( this ).parent().prop( 'id' );
$( params.newContainer ).find( '#' + containerId + ' > .dropdown-toggle' ).triggerHandler( 'click' );
});
}
});
secondary = $( '#secondary' );
button = $( '.site-branding' ).find( '.secondary-toggle' );
// Enable menu toggle for small screens.
( function() {
var menu, widgets, social;
if ( ! secondary.length || ! button.length ) {
return;
}
// Hide button if there are no widgets and the menus are missing or empty.
menu = secondary.find( '.nav-menu' );
widgets = secondary.find( '#widget-area' );
social = secondary.find( '#social-navigation' );
if ( ! widgets.length && ! social.length && ( ! menu.length || ! menu.children().length ) ) {
button.hide();
return;
}
button.on( 'click.twentyfifteen', function() {
secondary.toggleClass( 'toggled-on' );
secondary.trigger( 'resize' );
$( this ).toggleClass( 'toggled-on' );
if ( $( this, secondary ).hasClass( 'toggled-on' ) ) {
$( this ).attr( 'aria-expanded', 'true' );
secondary.attr( 'aria-expanded', 'true' );
} else {
$( this ).attr( 'aria-expanded', 'false' );
secondary.attr( 'aria-expanded', 'false' );
}
} );
} )();
/**
* @summary Add or remove ARIA attributes.
* Uses jQuery's width() function to determine the size of the window and add
* the default ARIA attributes for the menu toggle if it's visible.
* @since Twenty Fifteen 1.1
*/
function onResizeARIA() {
if ( 955 > $window.width() ) {
button.attr( 'aria-expanded', 'false' );
secondary.attr( 'aria-expanded', 'false' );
button.attr( 'aria-controls', 'secondary' );
} else {
button.removeAttr( 'aria-expanded' );
secondary.removeAttr( 'aria-expanded' );
button.removeAttr( 'aria-controls' );
}
}
// Sidebar scrolling.
function resize() {
windowWidth = $window.width();
if ( 955 > windowWidth ) {
top = bottom = false;
$sidebar.removeAttr( 'style' );
}
}
function scroll() {
var windowPos = $window.scrollTop();
if ( 955 > windowWidth ) {
return;
}
sidebarHeight = $sidebar.height();
windowHeight = $window.height();
bodyHeight = $body.height();
if ( sidebarHeight + adminbarOffset > windowHeight ) {
if ( windowPos > lastWindowPos ) {
if ( top ) {
top = false;
topOffset = ( $sidebar.offset().top > 0 ) ? $sidebar.offset().top - adminbarOffset : 0;
$sidebar.attr( 'style', 'top: ' + topOffset + 'px;' );
} else if ( ! bottom && windowPos + windowHeight > sidebarHeight + $sidebar.offset().top && sidebarHeight + adminbarOffset < bodyHeight ) {
bottom = true;
$sidebar.attr( 'style', 'position: fixed; bottom: 0;' );
}
} else if ( windowPos < lastWindowPos ) {
if ( bottom ) {
bottom = false;
topOffset = ( $sidebar.offset().top > 0 ) ? $sidebar.offset().top - adminbarOffset : 0;
$sidebar.attr( 'style', 'top: ' + topOffset + 'px;' );
} else if ( ! top && windowPos + adminbarOffset < $sidebar.offset().top ) {
top = true;
$sidebar.attr( 'style', 'position: fixed;' );
}
} else {
top = bottom = false;
topOffset = ( $sidebar.offset().top > 0 ) ? $sidebar.offset().top - adminbarOffset : 0;
$sidebar.attr( 'style', 'top: ' + topOffset + 'px;' );
}
} else if ( ! top ) {
top = true;
$sidebar.attr( 'style', 'position: fixed;' );
}
lastWindowPos = windowPos;
}
function resizeAndScroll() {
resize();
scroll();
}
$( document ).ready( function() {
$body = $( document.body );
$window = $( window );
$sidebar = $( '#sidebar' ).first();
adminbarOffset = $body.is( '.admin-bar' ) ? $( '#wpadminbar' ).height() : 0;
$window
.on( 'scroll.twentyfifteen', scroll )
.on( 'load.twentyfifteen', onResizeARIA )
.on( 'resize.twentyfifteen', function() {
clearTimeout( resizeTimer );
resizeTimer = setTimeout( resizeAndScroll, 500 );
onResizeARIA();
} );
$sidebar.on( 'click.twentyfifteen keydown.twentyfifteen', 'button', resizeAndScroll );
resizeAndScroll();
for ( var i = 1; i < 6; i++ ) {
setTimeout( resizeAndScroll, 100 * i );
}
} );
} )( jQuery );
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