All: Add support for application plugins (#3257)

ReactNativeClient/lib/services/plugins/api/JoplinWorkspace.ts

@@ -0,0 +1,68 @@
+import eventManager from 'lib/eventManager';
+
+/**
+ * @ignore
+ */
+const Note = require('lib/models/Note');
+
+/**
+ * The workspace service provides access to all the parts of Joplin that are being worked on - i.e. the currently selected notes or notebooks as well
+ * as various related events, such as when a new note is selected, or when the note content changes.
+ *
+ * [View the demo plugin](https://github.com/laurent22/joplin/CliClient/tests/support/plugins)
+ */
+export default class JoplinWorkspace {
+	// TODO: unregister events when plugin is closed or disabled
+
+	private store: any;
+	// private implementation_:any;
+
+	constructor(_implementation:any, store: any) {
+		this.store = store;
+		// this.implementation_ = implementation;
+	}
+
+	/**
+	 * Called when a new note or notes are selected.
+	 */
+	async onNoteSelectionChange(callback: Function) {
+		eventManager.appStateOn('selectedNoteIds', callback);
+	}
+
+	/**
+	 * Called when the content of a note changes.
+	 */
+	async onNoteContentChange(callback: Function) {
+		eventManager.on('noteContentChange', callback);
+	}
+
+	/**
+	 * Called when an alarm associated with a to-do is triggered.
+	 */
+	async onNoteAlarmTrigger(callback:Function) {
+		eventManager.on('noteAlarmTrigger', callback);
+	}
+
+	/**
+	 * Called when the synchronisation process has finished.
+	 */
+	async onSyncComplete(callback:Function) {
+		eventManager.on('syncComplete', callback);
+	}
+
+	/**
+	 * Gets the currently selected note
+	 */
+	async selectedNote():Promise<any> {
+		const noteIds = this.store.getState().selectedNoteIds;
+		if (noteIds.length !== 1) { return null; }
+		return Note.load(noteIds[0]);
+	}
+
+	/**
+	 * Gets the IDs of the selected notes (can be zero, one, or many). Use the data API to retrieve information about these notes.
+	 */
+	async selectedNoteIds():Promise<string[]> {
+		return this.store.getState().selectedNoteIds.slice();
+	}
+}