snapshot of https://github.com/jitsi/jitsi-meet.git @ fd1749dd28f4138aa80234fc7f311b19aaffa0e7 (2026-09-15)

react/features/multi-screen/reducer.ts

@@ -0,0 +1,81 @@
+import ReducerRegistry from '../base/redux/ReducerRegistry';
+
+import {
+    REMOVE_SECOND_SCREEN,
+    RESET_SECOND_SCREENS,
+    SET_SECOND_SCREEN,
+    SET_SECOND_SCREEN_WINDOW
+} from './actionTypes';
+import { ISecondScreenEntry } from './types';
+
+export interface IMultiScreenState {
+
+    /**
+     * The second-screen windows, keyed by window id. This is the single source
+     * of truth for the feature: each entry holds both the configuration (source
+     * + target screen) and the live window handle. Redux state is never
+     * serialized for storage here, so the non-serializable handle (the
+     * {@code Window}, its {@code <video>} and tracks) lives on the entry too,
+     * rather than in a separate module-scoped map; the middleware reconciles the
+     * live windows to this state.
+     */
+    screens: { [id: string]: ISecondScreenEntry; };
+}
+
+const DEFAULT_STATE: IMultiScreenState = {
+    screens: {}
+};
+
+ReducerRegistry.register<IMultiScreenState>('features/multi-screen',
+(state = DEFAULT_STATE, action): IMultiScreenState => {
+    switch (action.type) {
+    case SET_SECOND_SCREEN:
+
+        // Merge so a re-configuration of an existing window keeps its live handle.
+        return {
+            ...state,
+            screens: {
+                ...state.screens,
+                [action.id]: {
+                    ...state.screens[action.id],
+                    source: action.source,
+
+                    // Keep the screen an existing window was configured for when
+                    // the new request names none: re-sourcing a window (a
+                    // setSecondScreen with no `screen`) says what it should show,
+                    // not that it should go back to the default screen. Dropping
+                    // it would also be read as "wherever a window with no screen
+                    // goes" everywhere the id is used.
+                    screenId: action.screenId ?? state.screens[action.id]?.screenId,
+                    setAt: action.setAt
+                }
+            }
+        };
+    case SET_SECOND_SCREEN_WINDOW: {
+        const entry = state.screens[action.id];
+
+        if (!entry) {
+            return state;
+        }
+
+        return {
+            ...state,
+            screens: {
+                ...state.screens,
+                [action.id]: { ...entry, handle: action.handle }
+            }
+        };
+    }
+    case REMOVE_SECOND_SCREEN: {
+        const screens = { ...state.screens };
+
+        delete screens[action.id];
+
+        return { ...state, screens };
+    }
+    case RESET_SECOND_SCREENS:
+        return { ...state, screens: {} };
+    }
+
+    return state;
+});