GUI -- Enhancements for mobile devices:

- Enable zoom by default
- Suppress tooltips
- Suppress user-selection "blue-square" from #ov-topo svg

Change-Id: I00918f669444822a8b2b89f6c057741a0251fbd1

@@ -64,9 +64,11 @@
     // === API functions ------------------------------------------------
 
     function showTooltip(el, msg) {
-        if (!el || !msg) {
+        // tooltips don't make sense on mobile devices
+        if (!el || !msg || fs.isMobile()) {
             return;
         }
+
         var elem = d3.select(el),
             mouseX = d3.event.pageX,
             mouseY = d3.event.pageY,

@@ -20,6 +20,10 @@
 
 /* --- Base SVG Layer --- */
 
+#ov-topo svg {
+    /* prevents the little cut/copy/paste square that would appear on iPad */
+    -webkit-user-select: none;
+}
 .light #ov-topo svg {
     background-color: #fff;
 }

@@ -168,7 +168,7 @@
 
     // zoom enabled predicate. ev is a D3 source event.
     function zoomEnabled(ev) {
-        return (ev.metaKey || ev.altKey);
+        return fs.isMobile() || (ev.metaKey || ev.altKey);
     }
 
     function zoomCallback() {