two fingers press to open context menu

javascript/contextMenus.js

@@ -107,18 +107,25 @@ var contextMenuInit = function() {
                 oldMenu.remove();
             }
         });
-        gradioApp().addEventListener("contextmenu", function(e) {
+        ['contextmenu', 'touchstart'].forEach((eventType) => {
+            gradioApp().addEventListener(eventType, function(e) {
+                let ev = e;
+                if (eventType.startsWith('touch')) {
+                    if (e.touches.length !== 2) return;
+                    ev = e.touches[0];
+                }
                 let oldMenu = gradioApp().querySelector('#context-menu');
                 if (oldMenu) {
                     oldMenu.remove();
                 }
                 menuSpecs.forEach(function(v, k) {
                     if (e.composedPath()[0].matches(k)) {
-                    showContextMenu(e, e.composedPath()[0], v);
+                        showContextMenu(ev, e.composedPath()[0], v);
                         e.preventDefault();
                     }
                 });
             });
+        });
         eventListenerApplied = true;
 
     }