feat(action): export getActionClass, extend action

src/core.ts

@@ -29,7 +29,7 @@ export {
 } from './geometry/label';
 
 // 注册 interaction
-export { getInteraction, registerInteraction, registerAction } from './interaction';
+export { getInteraction, registerInteraction, registerAction, getActionClass } from './interaction';
 
 // 注册 facet
 export { getFacet, registerFacet } from './facet';

src/interaction/action/index.ts

@@ -1,2 +1,2 @@
 export { default as Action } from './base'; // 导出 Action 基类
-export { createAction, registerAction } from './register';
+export { createAction, registerAction, getActionClass } from './register';

src/interaction/action/register.ts

@@ -32,6 +32,15 @@ export function createAction(actionName: string, context: IInteractionContext):
   return action;
 }
 
+/**
+ * 根据 action 的 name 获取定义的类
+ * @param actionName action 的 name
+ */
+export function getActionClass(actionName: string) {
+  const actionOption = ActionCache[actionName];
+  return actionOption && actionOption.ActionClass;
+}
+
 /**
  * 注册 Action
  * @param actionName - action 的名称

src/interaction/index.ts

@@ -46,4 +46,4 @@ export function createInteraction(name: string, view: View, cfg?: LooseObject) {
 }
 
 export { default as Interaction } from './interaction';
-export { Action, registerAction } from './action';
+export { Action, registerAction, getActionClass } from './action';

tests/unit/interaction/interaction-spec.ts

@@ -3,6 +3,7 @@ import Action from '../../../src/interaction/action/base';
 import {
   createAction,
   createCallbackAction,
+  getActionClass,
   registerAction,
   unregisterAction,
 } from '../../../src/interaction/action/register';
@@ -28,6 +29,10 @@ class CustomAction extends Action {
 }
 registerAction('custom', CustomAction); // 注册
 describe('create action test', () => {
+  it('getActionClass', () => {
+    expect(getActionClass('custom')).toBe(CustomAction);
+    expect(getActionClass('test11')).toBe(undefined);
+  });
   it('create action', () => {
     const context = new Context(null);
     const action = createAction('custom', context);