function onMenuKeyDown()

in modules/closure/menu/menu.js [838:889]
50 lines of code
16 McCabe index (conditional complexity)

        function onMenuKeyDown(ev) {
          var handled;
          switch (ev.keyCode) {
            case $mdConstant.KEY_CODE.ESCAPE:
              if (opts.nestLevel) {
                opts.mdMenuCtrl.close();
              } else {
                opts.mdMenuCtrl.close(false, { closeAll: true });
              }
              handled = true;
              break;
            case $mdConstant.KEY_CODE.TAB:
              opts.mdMenuCtrl.close(false, { closeAll: true });
              // Don't prevent default or stop propagation on this event as we want tab
              // to move the focus to the next focusable element on the page.
              handled = false;
              break;
            case $mdConstant.KEY_CODE.UP_ARROW:
              if (!focusMenuItem(ev, opts.menuContentEl, opts, -1) && !opts.nestLevel) {
                opts.mdMenuCtrl.triggerContainerProxy(ev);
              }
              handled = true;
              break;
            case $mdConstant.KEY_CODE.DOWN_ARROW:
              if (!focusMenuItem(ev, opts.menuContentEl, opts, 1) && !opts.nestLevel) {
                opts.mdMenuCtrl.triggerContainerProxy(ev);
              }
              handled = true;
              break;
            case $mdConstant.KEY_CODE.LEFT_ARROW:
              if (opts.nestLevel) {
                opts.mdMenuCtrl.close();
              } else {
                opts.mdMenuCtrl.triggerContainerProxy(ev);
              }
              handled = true;
              break;
            case $mdConstant.KEY_CODE.RIGHT_ARROW:
              var parentMenu = $mdUtil.getClosest(ev.target, 'MD-MENU');
              if (parentMenu && parentMenu != opts.parent[0]) {
                ev.target.click();
              } else {
                opts.mdMenuCtrl.triggerContainerProxy(ev);
              }
              handled = true;
              break;
          }
          if (handled) {
            ev.preventDefault();
            ev.stopImmediatePropagation();
          }
        }