pretty big changes: added highlighted keys refactored Octave component to use a PianoKeyComponent and updated TS types to enums

front/components/VirtualPiano/Octave.tsx

@@ -4,11 +4,10 @@ import {
 	NoteNameBehavior,
 	octaveKeys,
 	Accidental,
+	HighlightedKey,
 } from "../../models/Piano";
-import { Box, Row, Pressable, ZStack, Text } from "native-base";
-
-const notesList: Array<Note> = ["C", "D", "E", "F", "G", "A", "B"];
-const accidentalsList: Array<Accidental> = ["#", "b", "##", "bb"];
+import { Box, Row, Pressable, Text } from "native-base";
+import PianoKeyComp from "./PianoKeyComp";
 
 const getKeyIndex = (n: Note, keys: PianoKey[]) => {
 	for (let i = 0; i < keys.length; i++) {
@@ -25,14 +24,14 @@ const isNoteVisible = (
 	isHovered: boolean,
 	isHighlighted: boolean
 ) => {
-	if (showNoteNamesPolicy === "always") return true;
-	if (showNoteNamesPolicy === "never") return false;
+	if (showNoteNamesPolicy === NoteNameBehavior.always) return true;
+	if (showNoteNamesPolicy === NoteNameBehavior.never) return false;
 
-	if (showNoteNamesPolicy === "onpress") {
+	if (showNoteNamesPolicy === NoteNameBehavior.onpress) {
 		return isPressed;
-	} else if (showNoteNamesPolicy === "onhover") {
+	} else if (showNoteNamesPolicy === NoteNameBehavior.onhover) {
 		return isHovered;
-	} else if (showNoteNamesPolicy === "onhighlight") {
+	} else if (showNoteNamesPolicy === NoteNameBehavior.onhighlight) {
 		return isHighlighted;
 	}
 	return false;
@@ -44,13 +43,36 @@ type OctaveProps = Parameters<typeof Box>[0] & {
 	endNote: Note;
 	showNoteNames: NoteNameBehavior;
 	showOctaveNumber: boolean;
+	whiteKeyBg: string;
+	whiteKeyBgPressed: string;
+	whiteKeyBgHovered: string;
+	blackKeyBg: string;
+	blackKeyBgPressed: string;
+	blackKeyBgHovered: string;
+	highlightedNotes: Array<HighlightedKey>;
+	defaultHighlightColor: string;
 	onNoteDown: (note: PianoKey) => void;
 	onNoteUp: (note: PianoKey) => void;
 };
 
 const Octave = (props: OctaveProps) => {
-	const { number, startNote, endNote, showNoteNames, showOctaveNumber, onNoteDown, onNoteUp } =
-		props;
+	const {
+		number,
+		startNote,
+		endNote,
+		showNoteNames,
+		showOctaveNumber,
+		whiteKeyBg,
+		whiteKeyBgPressed,
+		whiteKeyBgHovered,
+		blackKeyBg,
+		blackKeyBgPressed,
+		blackKeyBgHovered,
+		highlightedNotes,
+		defaultHighlightColor,
+		onNoteDown,
+		onNoteUp,
+	} = props;
 	const oK: PianoKey[] = octaveKeys.map((k) => {
 		return new PianoKey(k.note, k.accidental, number);
 	});
@@ -71,102 +93,61 @@ const Octave = (props: OctaveProps) => {
 		<Box {...props}>
 			<Row height={"100%"} width={"100%"}>
 				{whiteKeys.map((key, i) => {
+					const highlightedKey = highlightedNotes.find(
+						(h) =>
+							h.key.note === key.note && h.key.accidental === key.accidental
+					);
+					const isHighlighted = highlightedKey !== undefined;
+					const highlightColor =
+						highlightedKey?.bgColor ?? defaultHighlightColor;
 					return (
-						<Pressable
-							width={whiteKeyWidthExpr}
-							height={whiteKeyHeightExpr}
-							key={i}
-							onPressIn={() => onNoteDown(key)}
-							onPressOut={() => onNoteUp(key)}
-						>
-							{({ isHovered, isPressed }) => (
-								<Box
-									bg={
-										isHovered ? (isPressed ? "gray.300" : "gray.100") : "white"
-									}
-									w="100%"
-									h="100%"
-									borderWidth="1px"
-									borderColor="black"
-									justifyContent="flex-end"
-									alignItems="center"
-								>
-									{isNoteVisible(
-										showNoteNames,
-										isPressed,
-										isHovered,
-										false
-									) && (
-										<Text
-											style={{
-												userSelect: "none",
-												WebkitUserSelect: "none",
-												MozUserSelect: "none",
-												msUserSelect: "none",
-											}}
-											fontSize="xl"
-										>
-											{key.note}
-										</Text>
-									)}
-								</Box>
-							)}
-						</Pressable>
+						<PianoKeyComp
+							key={i} 
+							pianoKey={key}
+							bg={isHighlighted ? highlightColor :whiteKeyBg}
+							bgPressed={isHighlighted ? highlightColor : whiteKeyBgPressed}
+							bgHovered={isHighlighted ? highlightColor : whiteKeyBgHovered}
+							onKeyDown={() => onNoteDown(key)}
+							onKeyUp={() => onNoteUp(key)}
+							style={{
+								width: whiteKeyWidthExpr,
+								height: whiteKeyHeightExpr,
+							}}
+
+						/>
 					);
 				})}
 				{blackKeys.map((key, i) => {
+					const highlightedKey = highlightedNotes.find(
+						(h) =>
+							h.key.note === key.note && h.key.accidental === key.accidental
+					);
+					const isHighlighted = highlightedKey !== undefined;
+					const highlightColor =
+						highlightedKey?.bgColor ?? defaultHighlightColor;
 					return (
-						<Pressable
+						<PianoKeyComp
 							key={i}
-							onPressIn={() => onNoteDown(key)}
-							onPressOut={() => onNoteUp(key)}
-							width={blackKeyWidthExpr}
-							height={blackKeyHeightExpr}
+							pianoKey={key}
+							bg={isHighlighted ? highlightColor : blackKeyBg}
+							bgPressed={isHighlighted ? highlightColor : blackKeyBgPressed}
+							bgHovered={isHighlighted ? highlightColor : blackKeyBgHovered}
+							onKeyDown={() => onNoteDown(key)}
+							onKeyUp={() => onNoteUp(key)}
 							style={{
+								width: blackKeyWidthExpr,
+								height: blackKeyHeightExpr,
 								position: "absolute",
 								left: `calc(calc(${whiteKeyWidthExpr} * ${
 									i + ((i > 1) as unknown as number) + 1
 								}) - calc(${blackKeyWidthExpr} / 2))`,
 								top: "0px",
 							}}
-						>
-							{({ isHovered, isPressed }) => (
-								<Box
-									bg={
-										isHovered ? (isPressed ? "gray.700" : "gray.800") : "black"
-									}
-									w="100%"
-									h="100%"
-									borderWidth="1px"
-									borderColor="black"
-									color="white"
-									style={{
-										justifyContent: "flex-end",
-										alignItems: "center",
-									}}
-								>
-									{isNoteVisible(
-										showNoteNames,
-										isPressed,
-										isHovered,
-										false
-									) && (
-										<Text
-											style={{
-												userSelect: "none",
-												WebkitUserSelect: "none",
-												MozUserSelect: "none",
-												msUserSelect: "none",
-											}}
-											fontSize="xs"
-											color="white"
-										>
-											{key.note + key.accidental}
-										</Text>
-									)}
-								</Box>
-							)}
-						</Pressable>
+							text={{
+								color: "white",
+								fontSize: "xs",
+							}}
+						/>
 					);
 				})}
 			</Row>
@@ -195,6 +176,16 @@ const Octave = (props: OctaveProps) => {
 Octave.defaultProps = {
 	startNote: "C",
 	endNote: "B",
+	showNoteNames: "onpress",
+	showOctaveNumber: false,
+	whiteKeyBg: "white",
+	whiteKeyBgPressed: "gray.200",
+	whiteKeyBgHovered: "gray.100",
+	blackKeyBg: "black",
+	blackKeyBgPressed: "gray.600",
+	blackKeyBgHovered: "gray.700",
+	highlightedNotes: [],
+	defaultHighlightColor: "#FF0000",
 	onNoteDown: () => {},
 	onNoteUp: () => {},
 };

front/components/VirtualPiano/PianoKeyComp.tsx

@@ -0,0 +1,109 @@
+import { Box, Pressable, Text } from "native-base";
+import { Key } from "react";
+import { StyleProp, ViewStyle } from "react-native";
+import {
+	Note,
+	PianoKey,
+	NoteNameBehavior,
+	octaveKeys,
+	Accidental,
+	HighlightedKey,
+	keyToStr,
+} from "../../models/Piano";
+
+type PianoKeyProps = {
+	key?: Key;
+	pianoKey: PianoKey;
+	showNoteNames: NoteNameBehavior;
+	bg: string;
+	bgPressed: string;
+	bgHovered: string;
+	onKeyDown: () => void;
+	onKeyUp: () => void;
+	text: Parameters<typeof Text>[0];
+	style: StyleProp<ViewStyle>;
+};
+
+const isNoteVisible = (
+	noteNameBehavior: NoteNameBehavior,
+	isPressed: boolean,
+	isHovered: boolean
+) => {
+	if (noteNameBehavior === NoteNameBehavior.always) return true;
+	if (noteNameBehavior === NoteNameBehavior.never) return false;
+
+	if (noteNameBehavior === NoteNameBehavior.onpress) {
+		return isPressed;
+	} else if (noteNameBehavior === NoteNameBehavior.onhover) {
+		return isHovered;
+	}
+	return false;
+};
+
+const PianoKeyComp = ({
+	key,
+	pianoKey,
+	showNoteNames,
+	bg,
+	bgPressed,
+	bgHovered,
+	onKeyDown,
+	onKeyUp,
+	text,
+	style,
+}: PianoKeyProps) => {
+	const textDefaultProps = {
+		style: {
+			userSelect: "none",
+			WebkitUserSelect: "none",
+			MozUserSelect: "none",
+			msUserSelect: "none",
+		},
+		fontSize: "xl",
+		color: "black",
+	} as Parameters<typeof Text>[0];
+
+	const textProps = { ...textDefaultProps, ...text };
+	return (
+		<Pressable
+			key={key}
+			onPressIn={onKeyDown}
+			onPressOut={onKeyUp}
+			style={style}
+		>
+			{({ isHovered, isPressed }) => (
+				<Box
+					bg={(() => {
+						if (isPressed) return bgPressed;
+						if (isHovered) return bgHovered;
+						return bg;
+					})()}
+					w="100%"
+					h="100%"
+					borderWidth="1px"
+					borderColor="black"
+					justifyContent="flex-end"
+					alignItems="center"
+				>
+					{isNoteVisible(showNoteNames, isPressed, isHovered) && (
+						<Text {...textProps}>{keyToStr(pianoKey)}</Text>
+					)}
+				</Box>
+			)}
+		</Pressable>
+	);
+};
+
+PianoKeyComp.defaultProps = {
+	key: octaveKeys[0],
+	showNoteNames: NoteNameBehavior.onhover,
+	keyBg: "white",
+	keyBgPressed: "gray.200",
+	keyBgHovered: "gray.100",
+	onKeyDown: () => {},
+	onKeyUp: () => {},
+	text: {},
+	style: {},
+};
+
+export default PianoKeyComp;

front/components/VirtualPiano/VirtualPiano.tsx

@@ -36,7 +36,15 @@ const VirtualPiano = ({
     keyPressStyle,
     vividKeyPressColor,
 }: VirtualPianoProps) => {
-    const notesList: Array<Note> = ["C", "D", "E", "F", "G", "A", "B"];
+    const notesList: Array<Note> = [
+        Note.C,
+        Note.D,
+        Note.E,
+        Note.F,
+        Note.G,
+        Note.A,
+        Note.B,
+    ];
     const octaveList = [];
 
     for (let octaveNum = startOctave; octaveNum <= endOctave; octaveNum++) {
@@ -73,9 +81,9 @@ VirtualPiano.defaultProps = {
         console.log("Note up: " + n);
     },
 	startOctave: 2,
-	startNote: "C",
+	startNote: Note.C,
 	endOctave: 2,
-	endNote: "B",
+	endNote: Note.B,
 	showNoteNames: "onhover",
 	highlightedNotes: [],
 	highlightColor: "red",

front/models/Piano.ts

@@ -1,38 +1,119 @@
+export enum Note {
+	"C",
+	"D",
+	"E",
+	"F",
+	"G",
+	"A",
+	"B",
+}
 
+export enum Accidental {
+	"#",
+	"b",
+	"##",
+	"bb",
+}
 
-export type Note = "C" | "D" | "E" | "F" | "G" | "A" | "B";
-export type Accidental = "#" | "b" | "##" | "bb";
-
-export type NoteNameBehavior = "always" | "onpress" | "onhighlight" | "onhover" | "never";
-export type KeyPressStyle = "subtle" | "vivid";
+export enum NoteNameBehavior {
+	"always",
+	"onpress",
+	"onhighlight",
+	"onhover",
+	"never",
+}
+export enum KeyPressStyle {
+	"subtle",
+	"vivid",
+};
+export type HighlightedKey = {
+	key: PianoKey;
+	// if not specified, the default color for highlighted notes will be used
+	bgColor?: string;
+};
 
 export class PianoKey {
-    public note: Note;
-    public accidental?: Accidental;
-    public octave?: number;
+	public note: Note;
+	public accidental?: Accidental;
+	public octave?: number;
 
-    constructor(note: Note, accidental?: Accidental, octave?: number) {
-        this.note = note;
-        this.accidental = accidental;
-        this.octave = octave;
-    };
+	constructor(note: Note, accidental?: Accidental, octave?: number) {
+		this.note = note;
+		this.accidental = accidental;
+		this.octave = octave;
+	}
 
-    public toString = () => {
-        return this.note + (this.accidental || "") + (this.octave || "");
+	public toString = () => {
+		return this.note as unknown as string + (this.accidental || "") + (this.octave || "");
+	};
+}
+
+export const strToKey = (str: string): PianoKey => {
+    let note : Note;
+    switch (str[0]) {
+        case "C": note = Note.C; break;
+        case "D": note = Note.D; break;
+        case "E": note = Note.E; break;
+        case "F": note = Note.F; break;
+        case "G": note = Note.G; break;
+        case "A": note = Note.A; break;
+        case "B": note = Note.B; break;
+        default: throw new Error("Invalid note name");
     }
+    if (str.length === 1) {
+        return new PianoKey(note);
+    }
+    let accidental : Accidental;
+    switch (str[1]) {
+        case "#": accidental = Accidental["#"]; break;
+        case "b": accidental = Accidental["b"]; break;
+        case "x": accidental = Accidental["##"]; break;
+        case "n": accidental = Accidental["bb"]; break;
+        default: throw new Error("Invalid accidental");
+    }
+    if (str.length === 2) {
+        return new PianoKey(note, accidental);
+    }
+    const octave = parseInt(str[2] as unknown as string);
+    return new PianoKey(note, accidental, octave);
+};
+
+export const keyToStr = (key: PianoKey): string => {
+    let s = "";
+    switch (key.note) {
+        case Note.C: s += "C"; break;
+        case Note.D: s += "D"; break;
+        case Note.E: s += "E"; break;
+        case Note.F: s += "F"; break;
+        case Note.G: s += "G"; break;
+        case Note.A: s += "A"; break;
+        case Note.B: s += "B"; break;
+    }
+    if (key.accidental) {
+        switch (key.accidental) {
+            case Accidental["#"]: s += "#"; break;
+            case Accidental["b"]: s += "b"; break;
+            case Accidental["##"]: s += "x"; break;
+            case Accidental["bb"]: s += "n"; break;
+        }
+    }
+    if (key.octave) {
+        s += key.octave;
+    }
+    return s;
 };
 
 export const octaveKeys: Array<PianoKey> = [
-    new PianoKey("C", undefined),
-    new PianoKey("C", "#"),
-    new PianoKey("D", undefined),
-    new PianoKey("D", "#"),
-    new PianoKey("E", undefined),
-    new PianoKey("F", undefined),
-    new PianoKey("F", "#"),
-    new PianoKey("G", undefined),
-    new PianoKey("G", "#"),
-    new PianoKey("A", undefined),
-    new PianoKey("A", "#"),
-    new PianoKey("B", undefined),
+	new PianoKey(Note.C),
+	new PianoKey(Note.C, Accidental["#"]),
+    new PianoKey(Note.D),
+    new PianoKey(Note.D, Accidental["#"]),
+    new PianoKey(Note.E),
+    new PianoKey(Note.F),
+    new PianoKey(Note.F, Accidental["#"]),
+    new PianoKey(Note.G),
+    new PianoKey(Note.G, Accidental["#"]),
+    new PianoKey(Note.A),
+    new PianoKey(Note.A, Accidental["#"]),
+    new PianoKey(Note.B),
 ];