[Jifty-commit] r1411 - in jifty/trunk: share/web/static/js

[jifty-commit at lists.jifty.org]

Author: trs
Date: Fri Jun 30 02:17:46 2006
New Revision: 1411

Added:
   jifty/trunk/share/web/static/js/jifty_smoothscroll.js
Modified:
   jifty/trunk/   (props changed)

Log:
 r13597 at zot:  tom | 2006-06-30 02:17:28 -0400
 Oops.  This is kinda needed for the smooth scrolling to work.  ;)


Added: jifty/trunk/share/web/static/js/jifty_smoothscroll.js
==============================================================================
--- (empty file)
+++ jifty/trunk/share/web/static/js/jifty_smoothscroll.js	Fri Jun 30 02:17:46 2006
@@ -0,0 +1,36 @@
+
+if (typeof Jifty == "undefined") Jifty = { };
+
+Jifty.SmoothScroll = {
+    interval: '',
+    steps:    20,
+
+    scrollTo: function( y ) {
+        if ( Jifty.SmoothScroll.interval )
+            clearInterval( Jifty.SmoothScroll.interval );
+        
+        var stepsize = parseInt( ( y - Jifty.Utils.getScrollTop() ) / Jifty.SmoothScroll.steps );
+
+        Jifty.SmoothScroll.interval
+            = setInterval('Jifty.SmoothScroll.scrollWindow('+stepsize+','+y+')',10);
+    },
+            
+    scrollWindow: function( amount, y ) {
+        var curpos  = Jifty.Utils.getScrollTop();
+        var isAbove = ( curpos < y );
+        
+        window.scrollTo( 0, curpos + amount );
+        
+        var newpos     = Jifty.Utils.getScrollTop();
+        var newIsAbove = ( newpos < y );
+        
+        if ( ( isAbove != newIsAbove ) || ( curpos == newpos ) ) {
+            /* We've just scrolled past the destination, or we haven't moved
+               from the last scroll (i.e., we're at the bottom of the page),
+               so scroll exactly to the position
+             */
+            window.scrollTo( 0, y );
+            clearInterval( Jifty.SmoothScroll.interval );
+        }
+    }
+};