Update event handler blocks if the user renames a mechanism.

Author: lizlooney

src/blocks/mrc_event_handler.ts

@@ -281,6 +281,13 @@ const EVENT_HANDLER = {
   getEventBlockId: function(this: EventHandlerBlock): string {
     return this.mrcOtherBlockId;
   },
+  renameMechanismName: function(this: EventHandlerBlock, mechanismBlockId: string, newName: string): void {
+    // renameMechanismName is called when a mechanism block in the same module is modified.
+    if (this.mrcSenderType === SenderType.MECHANISM &&
+        mechanismBlockId === this.mrcMechanismBlockId) {
+      this.setFieldValue(newName, FIELD_SENDER);
+    }
+  },
 };
 
 export function setup(): void {
@@ -450,3 +457,11 @@ export function getMechanismEventHandlerBlocks(
     }
   });
 }
+
+export function renameMechanismName(workspace: Blockly.Workspace, mechanismBlockId: string, newName: string): void {
+  const eventHandlerBlocks: EventHandlerBlock[] = [];
+  getMechanismEventHandlerBlocks(workspace, mechanismBlockId, eventHandlerBlocks);
+  eventHandlerBlocks.forEach(block => {
+    (block as EventHandlerBlock).renameMechanismName(mechanismBlockId, newName);
+  });
+}

src/blocks/mrc_mechanism.ts

@@ -33,6 +33,7 @@ import * as storageModuleContent from '../storage/module_content';
 import * as storageNames from '../storage/names';
 import * as value from './utils/value';
 import { renameMethodCallers } from './mrc_call_python_function'
+import { renameMechanismName as renameMechanismNameInEventHandlers } from './mrc_event_handler'
 
 export const BLOCK_NAME = 'mrc_mechanism';
 export const OUTPUT_NAME = 'mrc_mechansim';
@@ -154,6 +155,8 @@ const MECHANISM = {
     if (oldName && oldName !== name && oldName !== legalName) {
       // Rename any callers.
       renameMethodCallers(this.workspace, this.id, legalName);
+      // Rename any event handlers
+      renameMechanismNameInEventHandlers(this.workspace, this.id, legalName);
     }
     return legalName;
   },