chore: rename editor model to note controller

app/assets/javascripts/ui_models/note_controller_group.ts

@@ -0,0 +1,84 @@
+import { removeFromArray, UuidString } from '@standardnotes/snjs';
+import { NoteController } from './note_controller';
+import { WebApplication } from './application';
+
+type NoteControllerGroupChangeCallback = () => void;
+
+export class NoteControllerGroup {
+  public noteControllers: NoteController[] = [];
+  private application: WebApplication;
+  changeObservers: NoteControllerGroupChangeCallback[] = [];
+
+  constructor(application: WebApplication) {
+    this.application = application;
+  }
+
+  public deinit() {
+    (this.application as unknown) = undefined;
+    for (const controller of this.noteControllers) {
+      this.deleteController(controller);
+    }
+  }
+
+  async createNoteController(
+    noteUuid?: string,
+    noteTitle?: string,
+    noteTag?: UuidString
+  ) {
+    const controller = new NoteController(
+      this.application,
+      noteUuid,
+      noteTitle,
+      noteTag
+    );
+    await controller.initialize();
+    this.noteControllers.push(controller);
+    this.notifyObservers();
+  }
+
+  deleteController(controller: NoteController) {
+    controller.deinit();
+    removeFromArray(this.noteControllers, controller);
+  }
+
+  closeController(controller: NoteController) {
+    this.deleteController(controller);
+    this.notifyObservers();
+  }
+
+  closeActiveController() {
+    const activeController = this.activeNoteController;
+    if (activeController) {
+      this.deleteController(activeController);
+    }
+  }
+
+  closeAllControllers() {
+    for (const controller of this.noteControllers) {
+      this.deleteController(controller);
+    }
+  }
+
+  get activeNoteController() {
+    return this.noteControllers[0];
+  }
+
+  /**
+   * Notifies observer when the active controller has changed.
+   */
+  public addChangeObserver(callback: NoteControllerGroupChangeCallback) {
+    this.changeObservers.push(callback);
+    if (this.activeNoteController) {
+      callback();
+    }
+    return () => {
+      removeFromArray(this.changeObservers, callback);
+    };
+  }
+
+  private notifyObservers() {
+    for (const observer of this.changeObservers) {
+      observer();
+    }
+  }
+}