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<title>[26125] trunk/src/wp-admin: Merge the sticky menu component from MP6.</title>
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<dt>Revision</dt> <dd><a href="http://core.trac.wordpress.org/changeset/26125">26125</a></dd>
<dt>Author</dt> <dd>helen</dd>
<dt>Date</dt> <dd>2013-11-13 04:29:27 +0000 (Wed, 13 Nov 2013)</dd>
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<h3>Log Message</h3>
<pre>Merge the sticky menu component from MP6. The admin menu is now fixed if the viewport is large enough. props tollmanz, tillkruess, dd32. see <a href="http://core.trac.wordpress.org/ticket/25858">#25858</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpadmincsswpadmincss">trunk/src/wp-admin/css/wp-admin.css</a></li>
<li><a href="#trunksrcwpadminjscommonjs">trunk/src/wp-admin/js/common.js</a></li>
</ul>

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<h3>Diff</h3>
<a id="trunksrcwpadmincsswpadmincss"></a>
<div class="modfile"><h4>Modified: trunk/src/wp-admin/css/wp-admin.css (26124 => 26125)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/src/wp-admin/css/wp-admin.css      2013-11-13 04:16:43 UTC (rev 26124)
+++ trunk/src/wp-admin/css/wp-admin.css 2013-11-13 04:29:27 UTC (rev 26125)
</span><span class="lines">@@ -1919,6 +1919,19 @@
</span><span class="cx">  height: 34px;
</span><span class="cx"> }
</span><span class="cx"> 
</span><ins>+/* Sticky admin menu */
+
+.sticky-menu #wpwrap {
+       z-index: 1; /* prevent flyouts from going behind content in Webkit */
+}
+
+.sticky-menu #adminmenuwrap {
+       position: fixed;
+       top: 32px;
+       left: 0;
+       z-index: 2; /* needs to be above .sticky-menu #wpwrap */
+}
+
</ins><span class="cx"> /* A new arrow */
</span><span class="cx"> 
</span><span class="cx"> .wp-menu-arrow {
</span></span></pre></div>
<a id="trunksrcwpadminjscommonjs"></a>
<div class="modfile"><h4>Modified: trunk/src/wp-admin/js/common.js (26124 => 26125)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/src/wp-admin/js/common.js  2013-11-13 04:16:43 UTC (rev 26124)
+++ trunk/src/wp-admin/js/common.js     2013-11-13 04:29:27 UTC (rev 26125)
</span><span class="lines">@@ -1,5 +1,5 @@
</span><span class="cx"> /* global setUserSetting, ajaxurl, commonL10n, alert, confirm, toggleWithKeyboard, pagenow */
</span><del>-var showNotice, adminMenu, columns, validateForm, screenMeta;
</del><ins>+var showNotice, adminMenu, columns, validateForm, screenMeta, stickyMenu;
</ins><span class="cx"> (function($){
</span><span class="cx"> // Removed in 3.3.
</span><span class="cx"> // (perhaps) needed for back-compat
</span><span class="lines">@@ -447,6 +447,89 @@
</span><span class="cx">  })();
</span><span class="cx"> });
</span><span class="cx"> 
</span><ins>+stickyMenu = {
+       active: false,
+
+       init: function () {
+               this.$window = $( window );
+               this.$body = $( document.body );
+               this.$adminMenuWrap = $( '#adminmenuwrap' );
+               this.$collapseMenu = $( '#collapse-menu' );
+               this.bodyMinWidth = parseInt( this.$body.css( 'min-width' ), 10 );
+               this.enable();
+       },
+
+       enable: function () {
+               if ( ! this.active ) {
+                       this.$window.on( 'resize.stickyMenu scroll.stickyMenu', this.debounce(
+                               $.proxy( this.update, this ), 200
+                       ) );
+                       this.$collapseMenu.on( 'click.stickyMenu', $.proxy( this.update, this ) );
+                       this.update();
+                       this.active = true;
+               }
+       },
+
+       disable: function () {
+               if ( this.active ) {
+                       this.$window.off( 'resize.stickyMenu scroll.stickyMenu' );
+                       this.$collapseMenu.off( 'click.stickyMenu' );
+                       this.$body.removeClass( 'sticky-menu' );
+                       this.active = false;
+               }
+       },
+
+       update: function () {
+               // Make the admin menu sticky if both of the following:
+               // 1. The viewport is taller than the admin menu
+               // 2. The viewport is wider than the min-width of the <body>
+               if ( this.$window.height() > this.$adminMenuWrap.height() + 32 && this.$window.width() > this.bodyMinWidth) {
+                       if ( ! this.$body.hasClass( 'sticky-menu' ) ) {
+                               this.$body.addClass( 'sticky-menu' );
+                       }
+               } else {
+                       if ( this.$body.hasClass( 'sticky-menu' ) ) {
+                               this.$body.removeClass( 'sticky-menu' );
+                       }
+               }
+       },
+
+       // Borrowed from Underscore.js
+       debounce: function( func, wait, immediate ) {
+               var timeout, args, context, timestamp, result;
+               return function() {
+                       var later, callNow;
+                       context = this;
+                       args = arguments;
+                       timestamp = new Date().getTime();
+                       later = function() {
+                               var last = new Date().getTime() - timestamp;
+                               if ( last < wait ) {
+                                       timeout = setTimeout( later, wait - last );
+                               } else {
+                                       timeout = null;
+                                       if ( ! immediate ) {
+                                               result = func.apply( context, args );
+                                               context = args = null;
+                                       }
+                               }
+                       };
+                       callNow = immediate && !timeout;
+                       if ( ! timeout ) {
+                               timeout = setTimeout( later, wait );
+                       }
+                       if ( callNow ) {
+                               result = func.apply( context, args );
+                               context = args = null;
+                       }
+
+                       return result;
+               };
+       }
+};
+
+stickyMenu.init();
+
</ins><span class="cx"> // internal use
</span><span class="cx"> $(document).bind( 'wp_CloseOnEscape', function( e, data ) {
</span><span class="cx">  if ( typeof(data.cb) != 'function' )
</span></span></pre>
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