Split MediaViewModel into multiple files

src/state/media/ScreenShareViewModel.ts

@@ -0,0 +1,51 @@
+/*
+Copyright 2023, 2024 New Vector Ltd.
+Copyright 2026 Element Creations Ltd.
+
+SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE in the repository root for full details.
+*/
+
+import { Track } from "livekit-client";
+
+import { type ObservableScope } from "../ObservableScope";
+import { type LocalScreenShareViewModel } from "./LocalScreenShareViewModel";
+import {
+  createMemberMedia,
+  type MemberMediaInputs,
+  type MemberMediaViewModel,
+} from "./MemberMediaViewModel";
+import { type RemoteScreenShareViewModel } from "./RemoteScreenShareViewModel";
+
+/**
+ * A participant's screen share media.
+ */
+export type ScreenShareViewModel =
+  | LocalScreenShareViewModel
+  | RemoteScreenShareViewModel;
+
+/**
+ * Properties which are common to all ScreenShareViewModels.
+ */
+export interface BaseScreenShareViewModel extends MemberMediaViewModel {
+  type: "screen share";
+}
+
+export type BaseScreenShareInputs = Omit<
+  MemberMediaInputs,
+  "audioSource" | "videoSource"
+>;
+
+export function createBaseScreenShare(
+  scope: ObservableScope,
+  inputs: BaseScreenShareInputs,
+): BaseScreenShareViewModel {
+  return {
+    ...createMemberMedia(scope, {
+      ...inputs,
+      audioSource: Track.Source.ScreenShareAudio,
+      videoSource: Track.Source.ScreenShare,
+    }),
+    type: "screen share",
+  };
+}