Ticket #18758: 18758-4.patch

wp-includes/js/admin-bar.dev.js

@@ -59 +59 @@
                         target.siblings('.ab-sub-wrapper').find('.ab-item').each(refresh);
                 });
 
+                $('#wpadminbar').click( function(e) {
+                        if ( e.target.id != 'wpadminbar' && e.target.id != 'wp-admin-bar-top-secondary' )
+                                return;
+
+                        e.preventDefault();
+                        $('html, body').animate({ scrollTop: 0 }, 'fast');
+                });
+
         });
 } else {
         (function(d, w) {
@@ -178 +186 @@
                                 }
                         }
                         return false;
+                },
+
+                scrollToTop = function(t) {
+                        var distance, speed, step, steps, timer, speed_step;
+
+                        // Ensure that the #wpadminbar was the target of the click.
+                        if ( t.id != 'wpadminbar' && t.id != 'wp-admin-bar-top-secondary' )
+                                return;
+
+                        distance    = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop || 0;
+
+                        if ( distance < 1 )
+                                return;
+
+                        speed_step = distance > 800 ? 130 : 100;
+                        speed     = Math.min( 12, Math.round( distance / speed_step ) );
+                        step      = distance > 800 ? Math.round( distance / 30  ) : Math.round( distance / 20  );
+                        steps     = [];
+                        timer     = 0;
+
+                        // Animate scrolling to the top of the page by generating steps to
+                        // the top of the page and shifting to each step at a set interval.
+                        while ( distance ) {
+                                distance -= step;
+                                if ( distance < 0 )
+                                        distance = 0;
+                                steps.push( distance );
+
+                                setTimeout( function() {
+                                        window.scrollTo( 0, steps.shift() );
+                                }, timer * speed );
+
+                                timer++;
+                        }
                 };
 
                 addEvent(w, 'load', function() {
@@ -198 +240 @@
                                 });
 
                                 addEvent(aB, 'click', clickShortlink );
+
+                                addEvent(aB, 'click', function(e) {
+                                        scrollToTop( e.target || e.srcElement );
+                                });
                         }
 
                         if ( w.location.hash )