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import { getDefaultMediumFont, getDefaultSmallFont } from "../../graphics/bdffont";
import { GrayImage } from "../../graphics/image";
import { wrapText, truncateText } from "../../graphics/textwrap";
import { clamp } from "../../util/numeric-util";
import {
GESTURE_CLICK,
GESTURE_DOUBLE_CLICK,
GESTURE_SCROLL,
GESTURE_SCROLL_DOWN,
GESTURE_SCROLL_UP,
} from "../gestures";
import { MenuLayer, drawSelectionHighlight, drawSubmenuIndicator } from "../menu";
import {
mediaControllerBridge,
type MediaControllerState,
type MediaQueueItem,
} from "../../native/media-controller";
import { mediaBrowserBridge, type MediaBrowserApp } from "../../native/media-browser";
import { MediaBrowseLayer } from "../apps/media-browse";
import { Layer, type DashboardInputEvent, type LayerContext, type PaintBelow } from "../layers";
import {
createInProcessWindow,
YieldAtRootLayer,
type InProcessAppOptions,
type InProcessWindow,
} from "./in-process-window";
export const MUSIC_WINDOW_ID = "music";
export const MUSIC_SURFACE_ID = "window:music";
const ART_SIZE = 96;
const ART_X = 22;
const ART_Y = 8;
const META_X = ART_X + ART_SIZE + 14;
const LIST_TOP = 120;
const ROW_HEIGHT = 16;
const ACTION_X = 22;
const ACTION_WIDTH = 154;
const COLUMN_DIVIDER_X = 190;
const QUEUE_X = 204;
const FOOTER_HEIGHT = 20;
const PLAYLIST_ACTION_INDEX = 1;
type MusicAction =
| { kind: "play-pause"; label: string; enabled: boolean }
| { kind: "previous"; label: string; enabled: boolean }
| { kind: "next"; label: string; enabled: boolean }
| { kind: "volume"; label: string; enabled: boolean }
| { kind: "playlist"; label: string; enabled: boolean }
| { kind: "browse"; label: string; enabled: boolean };
type FocusColumn = "actions" | "playlist";
/**
* Music controller app: metadata + album art + transport controls for the
* active Android media session (any player that publishes one), plus the
* player's queue when it exposes one (scroll to a track, click to jump).
*/
class MusicAppLayer implements Layer {
private focusColumn: FocusColumn = "actions";
private selectedActionIndex = 0;
private selectedQueueIndex = 0;
private queueScrollRow = 0;
private art: GrayImage | null = null;
private artKey = "";
isPlaylistFocused(): boolean {
return this.focusColumn === "playlist";
}
paint(ctx: LayerContext): GrayImage {
const font = getDefaultSmallFont();
const { width, height } = ctx.stack.getBaseSize();
const image = new GrayImage(width, height, 0);
const media = mediaControllerBridge.snapshot();
if (!media.accessEnabled) {
const lines = wrapText(
font,
"Notification access is required before Android exposes media sessions. Click to open settings.",
width - 48,
);
for (let index = 0; index < lines.length; index++) {
image.drawText(font, 24, 16 + index * 14, lines[index]!, 180);
}
image.drawText(font, 20, height - 16, `${GESTURE_CLICK} open settings ${GESTURE_DOUBLE_CLICK} back`, 110);
return image;
}
if (!media.available) {
image.drawText(font, 24, 16, "No active media session.", 180);
if (mediaBrowserBridge.listBrowsableApps().length) {
image.drawText(font, 24, 34, "Click to browse a music app's library,", 150);
image.drawText(font, 24, 48, "or start playback on the phone.", 150);
image.drawText(font, 20, height - 16, `${GESTURE_CLICK} browse ${GESTURE_DOUBLE_CLICK} back`, 110);
} else {
image.drawText(font, 24, 34, "Start playback in another app on the phone.", 150);
image.drawText(font, 20, height - 16, `${GESTURE_DOUBLE_CLICK} back`, 110);
}
return image;
}
this.drawArt(image, media);
const metaWidth = width - META_X - 24;
const titleLines = wrapText(font, media.title || "Unknown title", metaWidth).slice(0, 2);
for (let index = 0; index < titleLines.length; index++) {
image.drawText(font, META_X, ART_Y + 2 + index * 15, titleLines[index]!, 230);
}
image.drawText(font, META_X, ART_Y + 36, media.artist || "Unknown artist", 180);
if (media.album) {
image.drawText(font, META_X, ART_Y + 52, truncateText(font, media.album, metaWidth), 150);
}
image.drawText(font, META_X, ART_Y + 68, truncateText(font, media.appName || media.packageName, metaWidth), 110);
this.drawProgress(image, media, metaWidth);
const queue = mediaControllerBridge.getQueue();
const actions = this.buildActions(media, queue);
this.reconcileSelection(actions, queue);
const listHeight = height - LIST_TOP - FOOTER_HEIGHT;
const visibleRows = Math.max(1, (listHeight / ROW_HEIGHT) | 0);
if (this.selectedQueueIndex < this.queueScrollRow) {
this.queueScrollRow = this.selectedQueueIndex;
} else if (this.selectedQueueIndex >= this.queueScrollRow + visibleRows) {
this.queueScrollRow = this.selectedQueueIndex - visibleRows + 1;
}
this.queueScrollRow = clamp(this.queueScrollRow, 0, Math.max(0, queue.length - visibleRows));
for (let index = 0; index < actions.length; index++) {
const action = actions[index]!;
const y = LIST_TOP + index * ROW_HEIGHT;
const selected = index === this.selectedActionIndex;
const highlightX = ACTION_X - 6;
const highlightY = y - 1;
const highlightWidth = ACTION_WIDTH + 8;
const highlightHeight = ROW_HEIGHT - 1;
if (selected) {
drawSelectionHighlight(
image,
highlightX,
highlightY,
highlightWidth,
highlightHeight,
ctx.stack.isFocused() && this.focusColumn === "actions",
4,
);
}
const value = !action.enabled ? (selected ? 130 : 90) : selected ? 255 : 200;
image.drawText(font, ACTION_X, y + 1, truncateText(font, action.label, ACTION_WIDTH - 16), value);
if ((action.kind === "playlist" || action.kind === "browse") && action.enabled) {
drawSubmenuIndicator(image, font, highlightX, highlightY, highlightWidth, highlightHeight, value);
}
}
image.drawLine(COLUMN_DIVIDER_X, LIST_TOP - 3, COLUMN_DIVIDER_X, height - FOOTER_HEIGHT - 3, 45);
if (!queue.length) {
image.drawText(font, QUEUE_X, LIST_TOP + 1, "Playlist unavailable", 90);
} else {
const queueWidth = width - QUEUE_X - 20;
const lastVisible = Math.min(queue.length, this.queueScrollRow + visibleRows);
for (let index = this.queueScrollRow; index < lastVisible; index++) {
const item = queue[index]!;
const y = LIST_TOP + (index - this.queueScrollRow) * ROW_HEIGHT;
const selected = index === this.selectedQueueIndex;
if (selected) {
drawSelectionHighlight(
image,
QUEUE_X - 6,
y - 1,
queueWidth + 8,
ROW_HEIGHT - 1,
ctx.stack.isFocused() && this.focusColumn === "playlist",
4,
);
}
const label = `${item.active ? "> " : " "}${item.title || "(untitled)"}`;
image.drawText(font, QUEUE_X, y + 1, truncateText(font, label, queueWidth - 4), selected ? 255 : 200);
}
if (queue.length > visibleRows) {
const trackHeight = visibleRows * ROW_HEIGHT - 4;
const trackX = width - 12;
image.fillRect(trackX, LIST_TOP, 3, trackHeight, 30);
const thumbHeight = Math.max(8, (trackHeight * visibleRows / queue.length) | 0);
const maxScrollRow = queue.length - visibleRows;
const thumbY = LIST_TOP + (((trackHeight - thumbHeight) * this.queueScrollRow / maxScrollRow) | 0);
image.fillRect(trackX, thumbY, 3, thumbHeight, 120);
}
}
const backTarget = this.focusColumn === "playlist" ? "actions" : "back";
image.drawText(
font,
20,
height - 16,
`${GESTURE_SCROLL} select ${GESTURE_CLICK} activate ${GESTURE_DOUBLE_CLICK} ${backTarget}`,
110,
);
return image;
}
async handleInput(event: DashboardInputEvent, ctx: LayerContext): Promise<void> {
if (event.type === "double-click" && this.focusColumn === "playlist") {
this.focusColumn = "actions";
this.selectedActionIndex = PLAYLIST_ACTION_INDEX;
return;
}
const media = mediaControllerBridge.snapshot();
if (!media.accessEnabled) {
if (event.type === "click") {
mediaControllerBridge.openNotificationAccessSettings();
} else if (event.type === "double-click") {
ctx.stack.pop();
}
return;
}
if (!media.available) {
if (event.type === "click") {
this.openBrowse(ctx);
}
return;
}
const queue = mediaControllerBridge.getQueue();
const actions = this.buildActions(media, queue);
this.reconcileSelection(actions, queue);
switch (event.type) {
case "scroll-up":
if (this.focusColumn === "playlist") {
this.selectedQueueIndex = Math.max(0, this.selectedQueueIndex - 1);
} else {
this.selectedActionIndex = (this.selectedActionIndex + actions.length - 1) % actions.length;
}
return;
case "scroll-down":
if (this.focusColumn === "playlist") {
this.selectedQueueIndex = Math.min(Math.max(0, queue.length - 1), this.selectedQueueIndex + 1);
} else {
this.selectedActionIndex = (this.selectedActionIndex + 1) % actions.length;
}
return;
case "click": {
if (this.focusColumn === "playlist") {
const item = queue[this.selectedQueueIndex];
if (item) {
await mediaControllerBridge.skipToQueueItem(item.id);
// The player rebuilds the queue with the chosen track at index 0.
this.selectedQueueIndex = 0;
this.queueScrollRow = 0;
}
return;
}
const action = actions[this.selectedActionIndex];
if (!action || !action.enabled) return;
if (action.kind === "play-pause") await mediaControllerBridge.playPause();
else if (action.kind === "previous") await mediaControllerBridge.skipPrevious();
else if (action.kind === "next") await mediaControllerBridge.skipNext();
else if (action.kind === "browse") this.openBrowse(ctx);
else if (action.kind === "volume") {
ctx.stack.push(new VolumeModalLayer(mediaControllerBridge.getMediaVolumePercent()));
} else if (action.kind === "playlist") {
const activeIndex = queue.findIndex((item) => item.active);
if (activeIndex >= 0) this.selectedQueueIndex = activeIndex;
this.focusColumn = "playlist";
}
return;
}
default:
return;
}
}
/**
* Open the media-library browser (the Android Auto MediaBrowserService
* path): with one browsable player installed go straight to its library,
* otherwise offer a picker first.
*/
private openBrowse(ctx: LayerContext): void {
const apps = mediaBrowserBridge.listBrowsableApps(true);
if (!apps.length) return;
const pushBrowser = (target: LayerContext, app: MediaBrowserApp) => {
target.stack.push(
new MediaBrowseLayer({
app,
onPlayed: (browseCtx) => browseCtx.stack.pop(),
onLeave: (browseCtx) => browseCtx.stack.pop(),
}),
);
};
if (apps.length === 1) {
pushBrowser(ctx, apps[0]!);
return;
}
ctx.stack.push(
new MenuLayer(
"Browse library",
apps.map((app) => ({
label: app.appName,
onSelect: (menuCtx: LayerContext) => {
menuCtx.stack.pop();
pushBrowser(menuCtx, app);
},
})),
),
);
}
private buildActions(media: MediaControllerState, queue: MediaQueueItem[]): MusicAction[] {
const volume = mediaControllerBridge.getMediaVolumePercent();
return [
{
kind: "play-pause",
label: media.playbackState === "playing" ? "Pause" : "Play",
enabled: media.canPlayPause,
},
{ kind: "playlist", label: "Playlist", enabled: queue.length > 0 },
{ kind: "browse", label: "Browse library", enabled: mediaBrowserBridge.listBrowsableApps().length > 0 },
{ kind: "volume", label: volume >= 0 ? `Volume (${volume})` : "Volume", enabled: volume >= 0 },
{ kind: "next", label: "Next track", enabled: media.canSkipNext },
{ kind: "previous", label: "Previous track", enabled: media.canSkipPrevious },
];
}
private reconcileSelection(actions: MusicAction[], queue: MediaQueueItem[]): void {
this.selectedActionIndex = clamp(this.selectedActionIndex, 0, actions.length - 1);
this.selectedQueueIndex = clamp(this.selectedQueueIndex, 0, Math.max(0, queue.length - 1));
if (!queue.length && this.focusColumn === "playlist") {
this.focusColumn = "actions";
this.selectedActionIndex = PLAYLIST_ACTION_INDEX;
}
}
private drawProgress(image: GrayImage, media: MediaControllerState, width: number): void {
if (media.durationMs <= 0 || media.positionMs < 0) return;
const font = getDefaultSmallFont();
const y = ART_Y + 84;
const elapsed = formatMediaTime(media.positionMs);
const duration = formatMediaTime(media.durationMs);
image.drawText(font, META_X, y, elapsed, 140);
image.drawText(font, META_X + width - font.measureText(duration), y, duration, 140);
const barY = ART_Y + 100;
image.drawRect(META_X, barY, width, 5, 55);
const progress = clamp(media.positionMs / media.durationMs, 0, 1);
image.fillRect(META_X + 1, barY + 1, Math.round((width - 2) * progress), 3, 170);
}
private drawArt(image: GrayImage, media: MediaControllerState): void {
const key = `${media.packageName}|${media.title}|${media.album}`;
if (key !== this.artKey) {
this.artKey = key;
this.art = mediaControllerBridge.getAlbumArt(ART_SIZE);
}
if (this.art) {
// Center within the art box.
const dx = ART_X + Math.max(0, ((ART_SIZE - this.art.width) / 2) | 0);
const dy = ART_Y + Math.max(0, ((ART_SIZE - this.art.height) / 2) | 0);
image.bitBlt(this.art, dx, dy);
image.drawRect(dx - 1, dy - 1, this.art.width + 2, this.art.height + 2, 60);
} else {
image.drawRect(ART_X, ART_Y, ART_SIZE, ART_SIZE, 60);
const font = getDefaultSmallFont();
image.drawText(font, ART_X + 22, ART_Y + ART_SIZE / 2 - 7, "no art", 90);
}
}
}
/** Centered volume control overlay; scroll gestures adjust a 0..100 target by two. */
class VolumeModalLayer implements Layer {
private volume: number;
constructor(initialVolume: number) {
this.volume = clamp(initialVolume, 0, 100);
}
paint(ctx: LayerContext, paintBelow: PaintBelow): GrayImage {
const image = paintBelow();
const small = getDefaultSmallFont();
const medium = getDefaultMediumFont();
const { width, height } = ctx.stack.getBaseSize();
const boxWidth = 340;
const boxHeight = 150;
const x = ((width - boxWidth) / 2) | 0;
const y = ((height - boxHeight) / 2) | 0;
image.fillRoundedRect(x, y, boxWidth, boxHeight, 1, 8);
image.drawRoundedRect(x, y, boxWidth, boxHeight, 95, 8);
image.drawText(small, x + 18, y + 14, "Media volume", 180);
const value = `${this.volume} / 100`;
const valueX = x + (((boxWidth - medium.measureText(value)) / 2) | 0);
image.drawText(medium, valueX, y + 45, value, 245);
const barX = x + 28;
const barY = y + 83;
const barWidth = boxWidth - 56;
image.drawRect(barX, barY, barWidth, 9, 65);
image.fillRect(barX + 1, barY + 1, Math.round((barWidth - 2) * this.volume / 100), 7, 175);
const hint = `${GESTURE_SCROLL_UP} +2 ${GESTURE_SCROLL_DOWN} -2 ${GESTURE_DOUBLE_CLICK} done`;
const hintX = x + (((boxWidth - small.measureText(hint)) / 2) | 0);
image.drawText(small, hintX, y + 116, hint, 120);
return image;
}
handleInput(event: DashboardInputEvent, ctx: LayerContext): void {
if (event.type === "scroll-up") {
this.adjust(2);
} else if (event.type === "scroll-down") {
this.adjust(-2);
} else if (event.type === "double-click") {
ctx.stack.pop();
}
}
private adjust(delta: number): void {
this.volume = clamp(this.volume + delta, 0, 100);
mediaControllerBridge.setMediaVolumePercent(this.volume);
}
}
/** Let back leave the playlist column before the root wrapper yields to the shell. */
class MusicRootLayer implements Layer {
private readonly yieldAtRoot: YieldAtRootLayer;
constructor(private readonly music: MusicAppLayer) {
this.yieldAtRoot = new YieldAtRootLayer(music);
}
paint(ctx: LayerContext, paintBelow: PaintBelow): GrayImage {
return this.yieldAtRoot.paint(ctx, paintBelow);
}
async handleInput(event: DashboardInputEvent, ctx: LayerContext): Promise<void> {
if (event.type === "double-click" && this.music.isPlaylistFocused()) {
await this.music.handleInput(event, ctx);
return;
}
await this.yieldAtRoot.handleInput(event, ctx);
}
onRemoved(): void {
this.yieldAtRoot.onRemoved();
}
}
export function createMusicAppWindow(options: InProcessAppOptions): InProcessWindow {
let unsubscribe: (() => void) | null = null;
let progressTimer: ReturnType<typeof setInterval> | null = null;
const musicLayer = new MusicAppLayer();
const stopProgressTimer = () => {
if (progressTimer !== null) {
clearInterval(progressTimer);
progressTimer = null;
}
};
const app = createInProcessWindow({
appId: "music",
windowId: MUSIC_WINDOW_ID,
title: "Music",
iconLetter: "M",
icon: "music",
closeable: true,
actions: options.actions,
baseLayer: new MusicRootLayer(musicLayer),
submitFrame: options.submitFrame,
setSurfaceVisible: options.setSurfaceVisible,
removeSurface: options.removeSurface,
onClosed: () => {
stopProgressTimer();
unsubscribe?.();
unsubscribe = null;
options.onClosed();
},
});
unsubscribe = mediaControllerBridge.onStateChange((state) => {
if (state.playbackState === "playing" && state.durationMs > 0 && state.positionMs >= 0) {
progressTimer ??= setInterval(() => app.requestRender(), 1_000);
} else {
stopProgressTimer();
}
app.requestRender();
});
return app;
}
function formatMediaTime(milliseconds: number): string {
const totalSeconds = Math.max(0, Math.floor(milliseconds / 1_000));
const seconds = totalSeconds % 60;
const totalMinutes = Math.floor(totalSeconds / 60);
const minutes = totalMinutes % 60;
const hours = Math.floor(totalMinutes / 60);
return hours > 0
? `${hours}:${String(minutes).padStart(2, "0")}:${String(seconds).padStart(2, "0")}`
: `${minutes}:${String(seconds).padStart(2, "0")}`;
}