Mobile: Add support for plugin editor views (#11831)

Co-authored-by: Henry Heino <46334387+personalizedrefrigerator@users.noreply.github.com>

packages/lib/services/plugins/EditorPluginHandler.ts

@@ -0,0 +1,52 @@
+// The goal of this class is to simplify the integration of the `joplin.views.editor` plugin logic
+// in the desktop and mobile app. See here for more information:
+//
+// packages/lib/services/plugins/api/JoplinViewsEditor.ts
+
+import Logger from '@joplin/utils/Logger';
+import AsyncActionQueue, { IntervalType } from '../../AsyncActionQueue';
+import eventManager from '../../eventManager';
+import { EditorActivationCheckFilterObject } from './api/types';
+import type PluginService from './PluginService';
+import WebviewController from './WebviewController';
+
+const logger = Logger.create('EditorPluginHandler');
+
+const makeNoteUpdateAction = (pluginService: PluginService, shownEditorViewIds: string[]) => {
+	return async () => {
+		for (const viewId of shownEditorViewIds) {
+			const controller = pluginService.viewControllerByViewId(viewId) as WebviewController;
+			if (controller) controller.emitUpdate();
+		}
+	};
+};
+
+export default class {
+
+	private pluginService_: PluginService;
+	private viewUpdateAsyncQueue_ = new AsyncActionQueue(100, IntervalType.Fixed);
+
+	public constructor(pluginService: PluginService) {
+		this.pluginService_ = pluginService;
+	}
+
+	public emitUpdate(shownEditorViewIds: string[]) {
+		logger.info('emitUpdate:', shownEditorViewIds);
+		this.viewUpdateAsyncQueue_.push(makeNoteUpdateAction(this.pluginService_, shownEditorViewIds));
+	}
+
+	public async emitActivationCheck() {
+		let filterObject: EditorActivationCheckFilterObject = {
+			activatedEditors: [],
+		};
+		filterObject = await eventManager.filterEmit('editorActivationCheck', filterObject);
+
+		logger.info('emitActivationCheck: responses:', filterObject);
+
+		for (const editor of filterObject.activatedEditors) {
+			const controller = this.pluginService_.pluginById(editor.pluginId).viewController(editor.viewId) as WebviewController;
+			controller.setActive(editor.isActive);
+		}
+	}
+
+}