--- /dev/null
+/* 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;
+
+ // Add dropdown toggle that display child menu items.
+ $( '.main-navigation .page_item_has_children > a, .main-navigation .menu-item-has-children > a' ).after( '<button class="dropdown-toggle" aria-expanded="false">' + screenReaderText.expand + '</button>' );
+
+ $( '.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 );
+ } );
+
+ // Enable menu toggle for small screens.
+ ( function() {
+ var secondary = $( '#secondary' ), button, menu, widgets, social;
+ if ( ! secondary ) {
+ return;
+ }
+
+ button = $( '.site-branding' ).find( '.secondary-toggle' );
+ if ( ! button ) {
+ 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 || ! menu.children().length ) ) {
+ button.hide();
+ return;
+ }
+
+ button.on( 'click.twentyfifteen', function() {
+ secondary.toggleClass( 'toggled-on' );
+ secondary.trigger( 'resize' );
+ $( this ).toggleClass( 'toggled-on' );
+ } );
+ } )();
+
+ // Sidebar scrolling.
+ function resize() {
+ windowWidth = $window.width();
+ windowHeight = $window.height();
+ bodyHeight = $body.height();
+ sidebarHeight = $sidebar.height();
+
+ if ( 955 > windowWidth ) {
+ top = bottom = false;
+ $sidebar.removeAttr( 'style' );
+ }
+ }
+
+ function scroll() {
+ var windowPos = $window.scrollTop();
+
+ if ( 955 > windowWidth ) {
+ return;
+ }
+
+ 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( 'resize.twentyfifteen', function() {
+ clearTimeout( resizeTimer );
+ resizeTimer = setTimeout( resizeAndScroll, 500 );
+ } );
+ $sidebar.on( 'click keydown', 'button', resizeAndScroll );
+
+ resizeAndScroll();
+
+ for ( var i = 1; i < 6; i++ ) {
+ setTimeout( resizeAndScroll, 100 * i );
+ }
+ } );
+
+} )( jQuery );