Type view_room_delta as ViewRoomDelta

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/components/structures/LoggedInView.tsx

@@ -53,6 +53,7 @@ import {
 } from "../../toasts/ServerLimitToast";
 import { Action } from "../../dispatcher/actions";
 import LeftPanel2 from "./LeftPanel2";
+import { ViewRoomDeltaPayload } from "../../dispatcher/payloads/ViewRoomDeltaPayload";
 
 // We need to fetch each pinned message individually (if we don't already have it)
 // so each pinned message may trigger a request. Limit the number per room for sanity.
@@ -460,8 +461,8 @@ class LoggedInView extends React.Component<IProps, IState> {
             case Key.ARROW_UP:
             case Key.ARROW_DOWN:
                 if (ev.altKey && !ev.ctrlKey && !ev.metaKey) {
-                    dis.dispatch({
-                        action: 'view_room_delta',
+                    dis.dispatch<ViewRoomDeltaPayload>({
+                        action: Action.ViewRoomDelta,
                         delta: ev.key === Key.ARROW_UP ? -1 : 1,
                         unread: ev.shiftKey,
                     });

src/dispatcher/actions.ts

@@ -79,4 +79,9 @@ export enum Action {
      * Sets a system font. Should be used with UpdateSystemFontPayload
      */
     UpdateSystemFont = "update_system_font",
+
+    /**
+     * Changes room based on room list order and payload parameters. Should be used with ViewRoomDeltaPayload.
+     */
+    ViewRoomDelta = "view_room_delta",
 }

src/dispatcher/payloads/ViewRoomDeltaPayload.ts

@@ -0,0 +1,32 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { ActionPayload } from "../payloads";
+import { Action } from "../actions";
+
+export interface ViewRoomDeltaPayload extends ActionPayload {
+    action: Action.ViewRoomDelta;
+
+    /**
+     * The delta index of the room to view.
+     */
+    delta: number;
+
+    /**
+     * Optionally, whether or not to filter to unread (Bold/Grey/Red) rooms only. (Default: false)
+     */
+    unread?: boolean;
+}