Implement the new one-on-one layout

src/grid/OneOnOneLayout.tsx

@@ -0,0 +1,132 @@
+/*
+Copyright 2024 New Vector Ltd
+
+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 { forwardRef, useCallback, useMemo } from "react";
+import { useObservableEagerState } from "observable-hooks";
+import classNames from "classnames";
+
+import { OneOnOneLayout as OneOnOneLayoutModel } from "../state/CallViewModel";
+import {
+  CallLayout,
+  GridTileModel,
+  SpotlightTileModel,
+  arrangeTiles,
+} from "./CallLayout";
+import { useReactiveState } from "../useReactiveState";
+import styles from "./OneOnOneLayout.module.css";
+import { DragCallback } from "./Grid";
+
+export const makeOneOnOneLayout: CallLayout<OneOnOneLayoutModel> = ({
+  minBounds,
+  spotlightAlignment,
+  pipAlignment,
+}) => ({
+  fixed: forwardRef(function OneOnOneLayoutFixed({ model, Slot }, ref) {
+    const { width, height } = useObservableEagerState(minBounds);
+    const spotlightAlignmentValue = useObservableEagerState(spotlightAlignment);
+
+    const [generation] = useReactiveState<number>(
+      (prev) => (prev === undefined ? 0 : prev + 1),
+      [width, height, model.spotlight === undefined, spotlightAlignmentValue],
+    );
+
+    const spotlightTileModel: SpotlightTileModel | undefined = useMemo(
+      () =>
+        model.spotlight && {
+          type: "spotlight",
+          vms: model.spotlight,
+          maximised: false,
+        },
+      [model.spotlight],
+    );
+
+    const onDragSpotlight: DragCallback = useCallback(
+      ({ xRatio, yRatio }) =>
+        spotlightAlignment.next({
+          block: yRatio < 0.5 ? "start" : "end",
+          inline: xRatio < 0.5 ? "start" : "end",
+        }),
+      [],
+    );
+
+    return (
+      <div ref={ref} data-generation={generation} className={styles.layer}>
+        {spotlightTileModel && (
+          <Slot
+            className={classNames(styles.slot, styles.spotlight)}
+            id="spotlight"
+            model={spotlightTileModel}
+            onDrag={onDragSpotlight}
+            data-block-alignment={spotlightAlignmentValue.block}
+            data-inline-alignment={spotlightAlignmentValue.inline}
+          />
+        )}
+      </div>
+    );
+  }),
+
+  scrolling: forwardRef(function OneOnOneLayoutScrolling({ model, Slot }, ref) {
+    const { width, height } = useObservableEagerState(minBounds);
+    const pipAlignmentValue = useObservableEagerState(pipAlignment);
+    const { tileWidth, tileHeight } = useMemo(
+      () => arrangeTiles(width, height, 1),
+      [width, height],
+    );
+
+    const [generation] = useReactiveState<number>(
+      (prev) => (prev === undefined ? 0 : prev + 1),
+      [width, height, pipAlignmentValue],
+    );
+
+    const remoteTileModel: GridTileModel = useMemo(
+      () => ({ type: "grid", vm: model.remote }),
+      [model.remote],
+    );
+    const localTileModel: GridTileModel = useMemo(
+      () => ({ type: "grid", vm: model.local }),
+      [model.local],
+    );
+
+    const onDragLocalTile: DragCallback = useCallback(
+      ({ xRatio, yRatio }) =>
+        pipAlignment.next({
+          block: yRatio < 0.5 ? "start" : "end",
+          inline: xRatio < 0.5 ? "start" : "end",
+        }),
+      [],
+    );
+
+    return (
+      <div ref={ref} data-generation={generation} className={styles.layer}>
+        <Slot
+          id={remoteTileModel.vm.id}
+          model={remoteTileModel}
+          className={styles.container}
+          style={{ width: tileWidth, height: tileHeight }}
+        >
+          <Slot
+            className={classNames(styles.slot, styles.local)}
+            id={localTileModel.vm.id}
+            model={localTileModel}
+            onDrag={onDragLocalTile}
+            data-block-alignment={pipAlignmentValue.block}
+            data-inline-alignment={pipAlignmentValue.inline}
+          />
+        </Slot>
+      </div>
+    );
+  }),
+});