refactor(react): use beta approach for handling events everywhere

apps/client/src/components/component.ts

@@ -1,6 +1,8 @@
 import utils from "../services/utils.js";
 import type { CommandMappings, CommandNames, EventData, EventNames } from "./app_context.js";
 
+type EventHandler = ((data: any) => void);
+
 /**
  * Abstract class for all components in the Trilium's frontend.
  *
@@ -19,6 +21,7 @@ export class TypedComponent<ChildT extends TypedComponent<ChildT>> {
     initialized: Promise<void> | null;
     parent?: TypedComponent<any>;
     _position!: number;
+    private listeners: Record<string, EventHandler[]> | null = {};
 
     constructor() {
         this.componentId = `${this.sanitizedClassName}-${utils.randomString(8)}`;
@@ -76,6 +79,14 @@ export class TypedComponent<ChildT extends TypedComponent<ChildT>> {
     handleEventInChildren<T extends EventNames>(name: T, data: EventData<T>): Promise<unknown[] | unknown> | null {
         const promises: Promise<unknown>[] = [];
 
+        // Handle React children.
+        if (this.listeners?.[name]) {
+            for (const listener of this.listeners[name]) {
+                listener(data);
+            }
+        }
+
+        // Handle legacy children.
         for (const child of this.children) {
             const ret = child.handleEvent(name, data) as Promise<void>;
 
@@ -120,6 +131,35 @@ export class TypedComponent<ChildT extends TypedComponent<ChildT>> {
 
         return promise;
     }
+
+    registerHandler<T extends EventNames>(name: T, handler: EventHandler) {
+        if (!this.listeners) {
+            this.listeners = {};
+        }
+
+        if (!this.listeners[name]) {
+            this.listeners[name] = [];
+        }
+
+        if (this.listeners[name].includes(handler)) {
+            return;
+        }
+
+        this.listeners[name].push(handler);
+    }
+
+    removeHandler<T extends EventNames>(name: T, handler: EventHandler) {
+        if (!this.listeners?.[name]?.includes(handler)) {
+            return;
+        }
+
+        this.listeners[name] = this.listeners[name]
+            .filter(listener => listener !== handler);
+
+        if (!this.listeners[name].length) {
+            delete this.listeners[name];
+        }
+    }
 }
 
 export default class Component extends TypedComponent<Component> {}