vector-im-hydrogen-web/src/domain/session/SessionViewModel.js

/*
Copyright 2020 Bruno Windels <bruno@windels.cloud>
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 {LeftPanelViewModel} from "./leftpanel/LeftPanelViewModel.js";
import {RoomViewModel} from "./room/RoomViewModel.js";
import {SessionStatusViewModel} from "./SessionStatusViewModel.js";
import {RoomGridViewModel} from "./RoomGridViewModel.js";
import {ViewModel} from "../ViewModel.js";

export class SessionViewModel extends ViewModel {
    constructor(options) {
        super(options);
        const {sessionContainer} = options;
        this._session = sessionContainer.session;
        this._sessionStatusViewModel = this.track(new SessionStatusViewModel(this.childOptions({
            sync: sessionContainer.sync,
            reconnector: sessionContainer.reconnector,
            session: sessionContainer.session,
        })));
        this._leftPanelViewModel = new LeftPanelViewModel(this.childOptions({
            rooms: this._session.rooms,
            openRoom: this._openRoom.bind(this),
            gridEnabled: {
                get: () => !!this._gridViewModel,
                set: value => this._enabledGrid(value)
            }
        }));
        this._currentRoomTileViewModel = null;
        this._currentRoomViewModel = null;
        this._gridViewModel = null;
    }

    start() {
        this._sessionStatusViewModel.start();
    }

    get selectionId() {
        if (this._currentRoomViewModel) {
            return this._currentRoomViewModel.id;
        } else if (this._gridViewModel) {
            return "roomgrid";
        }
        return "placeholder";
    }

    get roomGridViewModel() {
        return this._gridViewModel;
    }

    get leftPanelViewModel() {
        return this._leftPanelViewModel;
    }

    get sessionStatusViewModel() {
        return this._sessionStatusViewModel;
    }

    get roomList() {
        return this._roomList;
    }

    get currentRoom() {
        return this._currentRoomViewModel;
    }

    _enabledGrid(enabled) {
        if (enabled) {
            this._gridViewModel = this.track(new RoomGridViewModel(this.childOptions({width: 3, height: 2})));
            // transfer current room
            if (this._currentRoomViewModel) {
                this.untrack(this._currentRoomViewModel);
                this._gridViewModel.setRoomViewModel(this._currentRoomViewModel, this._currentRoomTileViewModel);
                this._currentRoomViewModel = null;
                this._currentRoomTileViewModel = null;
            }
        } else {
            const VMs = this._gridViewModel.getAndUntrackFirst();
            if (VMs) {
                this._currentRoomViewModel = this.track(VMs.vm);
                this._currentRoomTileViewModel = VMs.tileVM;
                this._currentRoomTileViewModel.open();
            }
            this._gridViewModel = this.disposeTracked(this._gridViewModel);
        }
        this.emitChange("middlePanelViewType");
    }

    _closeCurrentRoom() {
        // no closing in grid for now as it is disabled on narrow viewports
        if (!this._gridViewModel) {
            this._currentRoomTileViewModel?.close();
            this._currentRoomViewModel = this.disposeTracked(this._currentRoomViewModel);
            return true;
        }
    }

    _openRoom(room, roomTileVM) {
        if (this._gridViewModel?.tryFocusRoom(room.id)) {
            return;
        } else if (this._currentRoomViewModel?.id === room.id) {
            return;
        }
        const roomVM = new RoomViewModel(this.childOptions({
            room,
            ownUserId: this._session.user.id,
            closeCallback: () => {
                if (this._closeCurrentRoom()) {
                    this.emitChange("currentRoom");
                }
            },
        }));
        roomVM.load();
        if (this._gridViewModel) {
            this._gridViewModel.setRoomViewModel(roomVM, roomTileVM);
        } else {
            this._closeCurrentRoom();
            this._currentRoomTileViewModel = roomTileVM;
            this._currentRoomViewModel = this.track(roomVM);
            this.emitChange("currentRoom");
        }
    }
}