Trackster: enable full keyboard navigation via arrow keys using jquery.scrollTo plugin.

static/scripts/jquery.scrollTo.js

@@ -0,0 +1,215 @@
+/**
+ * jQuery.ScrollTo
+ * Copyright (c) 2007-2009 Ariel Flesler - aflesler(at)gmail(dot)com | http://flesler.blogspot.com
+ * Dual licensed under MIT and GPL.
+ * Date: 5/25/2009
+ *
+ * @projectDescription Easy element scrolling using jQuery.
+ * http://flesler.blogspot.com/2007/10/jqueryscrollto.html
+ * Works with jQuery +1.2.6. Tested on FF 2/3, IE 6/7/8, Opera 9.5/6, Safari 3, Chrome 1 on WinXP.
+ *
+ * @author Ariel Flesler
+ * @version 1.4.2
+ *
+ * @id jQuery.scrollTo
+ * @id jQuery.fn.scrollTo
+ * @param {String, Number, DOMElement, jQuery, Object} target Where to scroll the matched elements.
+ *	  The different options for target are:
+ *		- A number position (will be applied to all axes).
+ *		- A string position ('44', '100px', '+=90', etc ) will be applied to all axes
+ *		- A jQuery/DOM element ( logically, child of the element to scroll )
+ *		- A string selector, that will be relative to the element to scroll ( 'li:eq(2)', etc )
+ *		- A hash { top:x, left:y }, x and y can be any kind of number/string like above.
+*		- A percentage of the container's dimension/s, for example: 50% to go to the middle.
+ *		- The string 'max' for go-to-end. 
+ * @param {Number} duration The OVERALL length of the animation, this argument can be the settings object instead.
+ * @param {Object,Function} settings Optional set of settings or the onAfter callback.
+ *	 @option {String} axis Which axis must be scrolled, use 'x', 'y', 'xy' or 'yx'.
+ *	 @option {Number} duration The OVERALL length of the animation.
+ *	 @option {String} easing The easing method for the animation.
+ *	 @option {Boolean} margin If true, the margin of the target element will be deducted from the final position.
+ *	 @option {Object, Number} offset Add/deduct from the end position. One number for both axes or { top:x, left:y }.
+ *	 @option {Object, Number} over Add/deduct the height/width multiplied by 'over', can be { top:x, left:y } when using both axes.
+ *	 @option {Boolean} queue If true, and both axis are given, the 2nd axis will only be animated after the first one ends.
+ *	 @option {Function} onAfter Function to be called after the scrolling ends. 
+ *	 @option {Function} onAfterFirst If queuing is activated, this function will be called after the first scrolling ends.
+ * @return {jQuery} Returns the same jQuery object, for chaining.
+ *
+ * @desc Scroll to a fixed position
+ * @example $('div').scrollTo( 340 );
+ *
+ * @desc Scroll relatively to the actual position
+ * @example $('div').scrollTo( '+=340px', { axis:'y' } );
+ *
+ * @dec Scroll using a selector (relative to the scrolled element)
+ * @example $('div').scrollTo( 'p.paragraph:eq(2)', 500, { easing:'swing', queue:true, axis:'xy' } );
+ *
+ * @ Scroll to a DOM element (same for jQuery object)
+ * @example var second_child = document.getElementById('container').firstChild.nextSibling;
+ *			$('#container').scrollTo( second_child, { duration:500, axis:'x', onAfter:function(){
+ *				alert('scrolled!!');																   
+ *			}});
+ *
+ * @desc Scroll on both axes, to different values
+ * @example $('div').scrollTo( { top: 300, left:'+=200' }, { axis:'xy', offset:-20 } );
+ */
+;(function( $ ){
+	
+	var $scrollTo = $.scrollTo = function( target, duration, settings ){
+		$(window).scrollTo( target, duration, settings );
+	};
+
+	$scrollTo.defaults = {
+		axis:'xy',
+		duration: parseFloat($.fn.jquery) >= 1.3 ? 0 : 1
+	};
+
+	// Returns the element that needs to be animated to scroll the window.
+	// Kept for backwards compatibility (specially for localScroll & serialScroll)
+	$scrollTo.window = function( scope ){
+		return $(window)._scrollable();
+	};
+
+	// Hack, hack, hack :)
+	// Returns the real elements to scroll (supports window/iframes, documents and regular nodes)
+	$.fn._scrollable = function(){
+		return this.map(function(){
+			var elem = this,
+				isWin = !elem.nodeName || $.inArray( elem.nodeName.toLowerCase(), ['iframe','#document','html','body'] ) != -1;
+
+				if( !isWin )
+					return elem;
+
+			var doc = (elem.contentWindow || elem).document || elem.ownerDocument || elem;
+			
+			return $.browser.safari || doc.compatMode == 'BackCompat' ?
+				doc.body : 
+				doc.documentElement;
+		});
+	};
+
+	$.fn.scrollTo = function( target, duration, settings ){
+		if( typeof duration == 'object' ){
+			settings = duration;
+			duration = 0;
+		}
+		if( typeof settings == 'function' )
+			settings = { onAfter:settings };
+			
+		if( target == 'max' )
+			target = 9e9;
+			
+		settings = $.extend( {}, $scrollTo.defaults, settings );
+		// Speed is still recognized for backwards compatibility
+		duration = duration || settings.speed || settings.duration;
+		// Make sure the settings are given right
+		settings.queue = settings.queue && settings.axis.length > 1;
+		
+		if( settings.queue )
+			// Let's keep the overall duration
+			duration /= 2;
+		settings.offset = both( settings.offset );
+		settings.over = both( settings.over );
+
+		return this._scrollable().each(function(){
+			var elem = this,
+				$elem = $(elem),
+				targ = target, toff, attr = {},
+				win = $elem.is('html,body');
+
+			switch( typeof targ ){
+				// A number will pass the regex
+				case 'number':
+				case 'string':
+					if( /^([+-]=)?\d+(\.\d+)?(px|%)?$/.test(targ) ){
+						targ = both( targ );
+						// We are done
+						break;
+					}
+					// Relative selector, no break!
+					targ = $(targ,this);
+				case 'object':
+					// DOMElement / jQuery
+					if( targ.is || targ.style )
+						// Get the real position of the target 
+						toff = (targ = $(targ)).offset();
+			}
+			$.each( settings.axis.split(''), function( i, axis ){
+				var Pos	= axis == 'x' ? 'Left' : 'Top',
+					pos = Pos.toLowerCase(),
+					key = 'scroll' + Pos,
+					old = elem[key],
+					max = $scrollTo.max(elem, axis);
+
+				if( toff ){// jQuery / DOMElement
+					attr[key] = toff[pos] + ( win ? 0 : old - $elem.offset()[pos] );
+
+					// If it's a dom element, reduce the margin
+					if( settings.margin ){
+						attr[key] -= parseInt(targ.css('margin'+Pos)) || 0;
+						attr[key] -= parseInt(targ.css('border'+Pos+'Width')) || 0;
+					}
+					
+					attr[key] += settings.offset[pos] || 0;
+					
+					if( settings.over[pos] )
+						// Scroll to a fraction of its width/height
+						attr[key] += targ[axis=='x'?'width':'height']() * settings.over[pos];
+				}else{ 
+					var val = targ[pos];
+					// Handle percentage values
+					attr[key] = val.slice && val.slice(-1) == '%' ? 
+						parseFloat(val) / 100 * max
+						: val;
+				}
+
+				// Number or 'number'
+				if( /^\d+$/.test(attr[key]) )
+					// Check the limits
+					attr[key] = attr[key] <= 0 ? 0 : Math.min( attr[key], max );
+
+				// Queueing axes
+				if( !i && settings.queue ){
+					// Don't waste time animating, if there's no need.
+					if( old != attr[key] )
+						// Intermediate animation
+						animate( settings.onAfterFirst );
+					// Don't animate this axis again in the next iteration.
+					delete attr[key];
+				}
+			});
+
+			animate( settings.onAfter );			
+
+			function animate( callback ){
+				$elem.animate( attr, duration, settings.easing, callback && function(){
+					callback.call(this, target, settings);
+				});
+			};
+
+		}).end();
+	};
+	
+	// Max scrolling position, works on quirks mode
+	// It only fails (not too badly) on IE, quirks mode.
+	$scrollTo.max = function( elem, axis ){
+		var Dim = axis == 'x' ? 'Width' : 'Height',
+			scroll = 'scroll'+Dim;
+		
+		if( !$(elem).is('html,body') )
+			return elem[scroll] - $(elem)[Dim.toLowerCase()]();
+		
+		var size = 'client' + Dim,
+			html = elem.ownerDocument.documentElement,
+			body = elem.ownerDocument.body;
+
+		return Math.max( html[scroll], body[scroll] ) 
+			 - Math.min( html[size]  , body[size]   );
+			
+	};
+
+	function both( val ){
+		return typeof val == 'object' ? val : { top:val, left:val };
+	};
+
+})( jQuery );

static/scripts/packed/jquery.scrollTo.js

@@ -0,0 +1 @@
+(function(c){var a=c.scrollTo=function(f,e,d){c(window).scrollTo(f,e,d)};a.defaults={axis:"xy",duration:parseFloat(c.fn.jquery)>=1.3?0:1};a.window=function(d){return c(window)._scrollable()};c.fn._scrollable=function(){return this.map(function(){var e=this,d=!e.nodeName||c.inArray(e.nodeName.toLowerCase(),["iframe","#document","html","body"])!=-1;if(!d){return e}var f=(e.contentWindow||e).document||e.ownerDocument||e;return c.browser.safari||f.compatMode=="BackCompat"?f.body:f.documentElement})};c.fn.scrollTo=function(f,e,d){if(typeof e=="object"){d=e;e=0}if(typeof d=="function"){d={onAfter:d}}if(f=="max"){f=9000000000}d=c.extend({},a.defaults,d);e=e||d.speed||d.duration;d.queue=d.queue&&d.axis.length>1;if(d.queue){e/=2}d.offset=b(d.offset);d.over=b(d.over);return this._scrollable().each(function(){var l=this,j=c(l),k=f,i,g={},m=j.is("html,body");switch(typeof k){case"number":case"string":if(/^([+-]=)?\d+(\.\d+)?(px|%)?$/.test(k)){k=b(k);break}k=c(k,this);case"object":if(k.is||k.style){i=(k=c(k)).offset()}}c.each(d.axis.split(""),function(q,r){var s=r=="x"?"Left":"Top",u=s.toLowerCase(),p="scroll"+s,o=l[p],n=a.max(l,r);if(i){g[p]=i[u]+(m?0:o-j.offset()[u]);if(d.margin){g[p]-=parseInt(k.css("margin"+s))||0;g[p]-=parseInt(k.css("border"+s+"Width"))||0}g[p]+=d.offset[u]||0;if(d.over[u]){g[p]+=k[r=="x"?"width":"height"]()*d.over[u]}}else{var t=k[u];g[p]=t.slice&&t.slice(-1)=="%"?parseFloat(t)/100*n:t}if(/^\d+$/.test(g[p])){g[p]=g[p]<=0?0:Math.min(g[p],n)}if(!q&&d.queue){if(o!=g[p]){h(d.onAfterFirst)}delete g[p]}});h(d.onAfter);function h(n){j.animate(g,e,d.easing,n&&function(){n.call(this,f,d)})}}).end()};a.max=function(j,i){var h=i=="x"?"Width":"Height",e="scroll"+h;if(!c(j).is("html,body")){return j[e]-c(j)[h.toLowerCase()]()}var g="client"+h,f=j.ownerDocument.documentElement,d=j.ownerDocument.body;return Math.max(f[e],d[e])-Math.min(f[g],d[g])};function b(d){return typeof d=="object"?d:{top:d,left:d}}})(jQuery);

templates/tracks/browser.mako

@@ -55,7 +55,7 @@ ${parent.javascripts()}
   <script type='text/javascript' src="${h.url_for('/static/scripts/excanvas.js')}"></script>
 <![endif]-->
 
-${h.js( "galaxy.base", "galaxy.panels", "json2", "jquery", "jquery.event.drag", "jquery.mousewheel", "jquery.autocomplete", "trackster", "jquery.ui.sortable.slider", "farbtastic" )}
+${h.js( "galaxy.base", "galaxy.panels", "json2", "jquery", "jquery.event.drag", "jquery.mousewheel", "jquery.autocomplete", "trackster", "jquery.ui.sortable.slider", "jquery.scrollTo", "farbtastic" )}
 
 <script type="text/javascript">
 
@@ -252,13 +252,26 @@ ${h.js( "galaxy.base", "galaxy.panels", "json2", "jquery", "jquery.event.drag",
                 });
             });
 
-            $(document).keydown( function( e ) {
-                // 37 == left
-                if ( e.which == 39 ) {
-                   view.move_fraction( -0.25 ); 
-                // 39 == right
-                } else if ( e.which == 37 ) {
-                   view.move_fraction( 0.25 ); 
+            //
+            // Keyboard navigation. Scroll ~7% of height when scrolling up/down.
+            //
+            $(document).keydown(function(e) {
+                // Key codes: left == 37, up == 38, right == 39, down == 40
+                switch(e.which) {
+                    case 37:
+                        view.move_fraction(0.25);
+                        break
+                    case 38:
+                        var change = Math.round(view.viewport_container.height()/15.0);
+                        view.viewport_container.scrollTo('-=' + change + 'px');
+                        break;
+                    case 39:
+                        view.move_fraction(-0.25);
+                        break;
+                    case 40:
+                        var change = Math.round(view.viewport_container.height()/15.0);
+                        view.viewport_container.scrollTo('+=' + change + 'px');
+                        break;
                 }
             });
         };