action_menu and list_action_menu Python components (deephaven#445)

plugins/ui/docs/README.md

@@ -216,7 +216,6 @@ def action_group():
             "Aaa",
             "Bbb",
             "Ccc",
-            action=action,
             on_action=on_action,
         ),
         ui.text(action),
@@ -227,6 +226,29 @@ def action_group():
 ag = action_group()
 ```
 
+## ActionMenu (string values)
+ActionMenu combines an ActionButton with a Menu for simple "more actions" use cases.
+
+```python
+@ui.component
+def action_menu():
+    [action, on_action] = ui.use_state()
+
+    return ui.flex(
+        ui.action_menu(
+            "Aaa",
+            "Bbb",
+            "Ccc",
+            on_action=on_action,
+        ),
+        ui.text(action),
+        direction="column",
+    )
+
+
+ag = action_menu()
+```
+
 ## Picker (string values)
 
 The `ui.picker` component can be used to select from a list of items. Here's a basic example for selecting from a list of string values and displaying the selected key in a text field.

plugins/ui/src/deephaven/ui/components/__init__.py

@@ -23,6 +23,7 @@
 __all__ = [
     "action_button",
     "action_group",
+    "action_menu",
     "button",
     "button_group",
     "checkbox",

plugins/ui/src/deephaven/ui/components/action_menu.py

@@ -0,0 +1,12 @@
+from ..elements import BaseElement
+
+
+def action_menu(*children, **props):
+    """
+    ActionMenu combines an ActionButton with a Menu for simple "more actions" use cases.
+
+    Args:
+        children: A list of Item or primitive elements.
+        **props: Any other ActionMenu prop.
+    """
+    return BaseElement(f"deephaven.ui.components.ActionMenu", *children, **props)

plugins/ui/src/js/src/elements/ElementConstants.ts

@@ -24,9 +24,11 @@ export const ELEMENT_NAME = {
 
   /** Other Components */
   actionGroup: uiComponentName('ActionGroup'),
+  actionMenu: uiComponentName('ActionMenu'),
   fragment: uiComponentName('Fragment'),
   item: uiComponentName('Item'),
   listActionGroup: uiComponentName('ListActionGroup'),
+  listActionMenu: uiComponentName('ListActionMenu'),
   listView: uiComponentName('ListView'),
   picker: uiComponentName('Picker'),
   section: uiComponentName('Section'),