moonfire-nvr/ui/src/Live/Multiview.tsx

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// This file is part of Moonfire NVR, a security camera network video recorder.
// Copyright (C) 2021 The Moonfire NVR Authors; see AUTHORS and LICENSE.txt.
// SPDX-License-Identifier: GPL-v3.0-or-later WITH GPL-3.0-linking-exception
import Select, { SelectChangeEvent } from "@material-ui/core/Select";
import MenuItem from "@material-ui/core/MenuItem";
import React, { useReducer } from "react";
import { Camera } from "../types";
import { makeStyles } from "@material-ui/styles";
import { Theme } from "@material-ui/core/styles";
export interface Layout {
className: string;
cameras: number;
}
// These class names must match useStyles rules (below).
const LAYOUTS: Layout[] = [
{ className: "solo", cameras: 1 },
{ className: "main-plus-five", cameras: 6 },
{ className: "two-by-two", cameras: 4 },
{ className: "three-by-three", cameras: 9 },
];
const MAX_CAMERAS = 9;
const useStyles = makeStyles((theme: Theme) => ({
root: {
flex: "1 0 0",
color: "white",
marginTop: theme.spacing(2),
overflow: "hidden",
// TODO: this mid-level div can probably be removed.
"& .mid": {
width: "100%",
height: "100%",
position: "relative",
display: "inline-block",
},
},
inner: {
// match parent's size without influencing it.
position: "absolute",
width: "100%",
height: "100%",
backgroundColor: "#000",
overflow: "hidden",
display: "grid",
gridGap: "0px",
// These class names must match LAYOUTS (above).
"&.solo": {
gridTemplateColumns: "100%",
gridTemplateRows: "100%",
},
"&.two-by-two": {
gridTemplateColumns: "repeat(2, calc(100% / 2))",
gridTemplateRows: "repeat(2, calc(100% / 2))",
},
"&.main-plus-five, &.three-by-three": {
gridTemplateColumns: "repeat(3, calc(100% / 3))",
gridTemplateRows: "repeat(3, calc(100% / 3))",
},
"&.main-plus-five > div:nth-child(1)": {
gridColumn: "span 2",
gridRow: "span 2",
},
},
}));
export interface MultiviewProps {
cameras: Camera[];
layoutIndex: number;
renderCamera: (camera: Camera | null, chooser: JSX.Element) => JSX.Element;
}
export interface MultiviewChooserProps {
/// An index into <tt>LAYOUTS</tt>.
layoutIndex: number;
onChoice: (selectedIndex: number) => void;
}
/**
* Chooses the layout for a Multiview.
* Styled for placement in the app menu bar.
*/
export const MultiviewChooser = (props: MultiviewChooserProps) => {
return (
<Select
id="layout"
value={props.layoutIndex}
onChange={(e) =>
props.onChoice(
typeof e.target.value === "string"
? parseInt(e.target.value)
: e.target.value
)
}
size="small"
sx={{
// Hacky attempt to style for the app menu.
color: "inherit",
"& svg": {
color: "inherit",
},
}}
>
{LAYOUTS.map((e, i) => (
<MenuItem key={e.className} value={i}>
{e.className}
</MenuItem>
))}
</Select>
);
};
/**
* The cameras selected for the multiview.
* This is always an array of length <tt>MAX_CAMERAS</tt>; only the first
* LAYOUTS[layoutIndex].cameras are currently visible. There are no duplicates;
* setting one element to a given camera unsets any others pointing to the same
* camera.
*/
type SelectedCameras = Array<number | null>;
interface SelectOp {
selectedIndex: number;
cameraIndex: number | null;
}
function selectedReducer(old: SelectedCameras, op: SelectOp): SelectedCameras {
let selected = [...old]; // shallow clone.
if (op.cameraIndex !== null) {
// de-dupe.
for (let i = 0; i < selected.length; i++) {
if (selected[i] === op.cameraIndex) {
selected[i] = null;
}
}
}
selected[op.selectedIndex] = op.cameraIndex ?? null;
return selected;
}
/**
* Presents one or more camera views in one of several layouts.
*
* The parent should arrange for the multiview's outer div to be as large
* as possible.
*/
const Multiview = (props: MultiviewProps) => {
const [selected, updateSelected] = useReducer(
selectedReducer,
Array(MAX_CAMERAS).fill(null)
);
const outerRef = React.useRef<HTMLDivElement>(null);
const classes = useStyles();
const layout = LAYOUTS[props.layoutIndex];
const monoviews = selected.slice(0, layout.cameras).map((e, i) => {
// When a camera is selected, use the camera's index as the key.
// This allows swapping cameras' positions without tearing down their
// WebSocket connections and buffers.
//
// When no camera is selected, use the index within selected. (Actually,
// -1 minus the index, to disambiguate between the two cases.)
const key = e ?? -1 - i;
return (
<Monoview
key={key}
cameras={props.cameras}
cameraIndex={e}
renderCamera={props.renderCamera}
onSelect={(cameraIndex) =>
updateSelected({ selectedIndex: i, cameraIndex })
}
/>
);
});
return (
<div className={classes.root} ref={outerRef}>
<div className="mid">
<div className={`${classes.inner} ${layout.className}`}>
{monoviews}
</div>
</div>
</div>
);
};
interface MonoviewProps {
cameras: Camera[];
cameraIndex: number | null;
onSelect: (cameraIndex: number | null) => void;
renderCamera: (camera: Camera | null, chooser: JSX.Element) => JSX.Element;
}
/** A single pane of a Multiview, including its camera chooser. */
const Monoview = (props: MonoviewProps) => {
const handleChange = (event: SelectChangeEvent<number | null>) => {
const {
target: { value },
} = event;
props.onSelect(typeof value === "string" ? parseInt(value) : value);
};
const chooser = (
<Select
value={props.cameraIndex == null ? undefined : props.cameraIndex}
onChange={handleChange}
displayEmpty
size="small"
sx={{
// Restyle to fit over the video (or black).
backgroundColor: "rgba(255, 255, 255, 0.5)",
"& svg": {
color: "inherit",
},
}}
>
<MenuItem value={undefined}>(none)</MenuItem>
{props.cameras.map((e, i) => (
<MenuItem key={i} value={i}>
{e.shortName}
</MenuItem>
))}
</Select>
);
return props.renderCamera(
props.cameraIndex === null ? null : props.cameras[props.cameraIndex],
chooser
);
};
export default Multiview;