feat(dropdown): allow pass string for prop trigger (#4199)

Author: CarterLi

components/dropdown/getDropdownProps.ts

@@ -3,8 +3,10 @@ import { PropType } from 'vue';
 import PropTypes from '../_util/vue-types';
 export default () => ({
   trigger: {
-    type: Array as PropType<('click' | 'hover' | 'contextmenu')[]>,
-    default: () => ['hover'],
+    type: [Array, String] as PropType<
+      ('click' | 'hover' | 'contextmenu')[] | 'click' | 'hover' | 'contextmenu'
+    >,
+    default: 'hover',
   },
   overlay: PropTypes.any,
   visible: PropTypes.looseBool,

components/vc-dropdown/src/Dropdown.jsx

@@ -25,7 +25,9 @@ export default defineComponent({
     overlayStyle: PropTypes.object.def(() => ({})),
     placement: PropTypes.string.def('bottomLeft'),
     overlay: PropTypes.any,
-    trigger: PropTypes.array.def(['hover']),
+    trigger: PropTypes.oneOfType([PropTypes.string, PropTypes.arrayOf(PropTypes.string)]).def(
+      'hover',
+    ),
     alignPoint: PropTypes.looseBool,
     showAction: PropTypes.array.def([]),
     hideAction: PropTypes.array.def([]),