versão 2.0
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// js/pattern_audio.js
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import { appState } from "../state.js";
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import { highlightStep } from "./pattern_ui.js";
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import { getTotalSteps } from "../utils.js";
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import { initializeAudioContext } from "../audio.js";
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const timerDisplay = document.getElementById('timer-display');
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function formatTime(milliseconds) {
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const totalSeconds = Math.floor(milliseconds / 1000);
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const minutes = Math.floor(totalSeconds / 60).toString().padStart(2, '0');
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const seconds = (totalSeconds % 60).toString().padStart(2, '0');
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const centiseconds = Math.floor((milliseconds % 1000) / 10).toString().padStart(2, '0');
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return `${minutes}:${seconds}:${centiseconds}`;
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}
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export function playMetronomeSound(isDownbeat) {
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initializeAudioContext();
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const synth = new Tone.Synth().toDestination();
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const freq = isDownbeat ? 1000 : 800;
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synth.triggerAttackRelease(freq, "8n", Tone.now());
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}
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// --- FUNÇÃO CORRIGIDA E EFICIENTE ---
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export function playSample(filePath, trackId) {
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initializeAudioContext();
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const track = trackId ? appState.pattern.tracks.find((t) => t.id == trackId) : null;
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// Se a faixa existe e tem um player pré-carregado, apenas o dispara.
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if (track && track.player) {
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// Atualiza o volume/pan caso tenham sido alterados
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track.gainNode.gain.value = Tone.gainToDb(track.volume);
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track.pannerNode.pan.value = track.pan;
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// Dispara o som imediatamente. Esta operação é instantânea.
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track.player.start(Tone.now());
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}
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// Fallback para preview de samples no navegador (sem trackId)
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else if (!trackId && filePath) {
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const previewPlayer = new Tone.Player(filePath).toDestination();
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previewPlayer.autostart = true;
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}
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}
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function tick() {
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if (!appState.global.isPlaying) {
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stopPlayback();
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return;
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}
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const totalSteps = getTotalSteps();
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const lastStepIndex = appState.global.currentStep === 0 ? totalSteps - 1 : appState.global.currentStep - 1;
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highlightStep(lastStepIndex, false);
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const bpm = parseInt(document.getElementById("bpm-input").value, 10) || 120;
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const stepInterval = (60 * 1000) / (bpm * 4);
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const currentTime = appState.global.currentStep * stepInterval;
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if (timerDisplay) {
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timerDisplay.textContent = formatTime(currentTime);
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}
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if (appState.global.metronomeEnabled) {
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const noteValue = parseInt(document.getElementById("compasso-b-input").value, 10) || 4;
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const stepsPerBeat = 16 / noteValue;
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if (appState.global.currentStep % stepsPerBeat === 0) {
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playMetronomeSound(appState.global.currentStep % (stepsPerBeat * 4) === 0);
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}
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}
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appState.pattern.tracks.forEach((track) => {
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if (!track.patterns || track.patterns.length === 0) return;
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const activePattern = track.patterns[appState.pattern.activePatternIndex];
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if (activePattern && activePattern.steps[appState.global.currentStep] && track.samplePath) {
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playSample(track.samplePath, track.id);
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}
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});
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highlightStep(appState.global.currentStep, true);
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appState.global.currentStep = (appState.global.currentStep + 1) % totalSteps;
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}
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export function startPlayback() {
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if (appState.global.isPlaying || appState.pattern.tracks.length === 0) return;
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initializeAudioContext();
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if (appState.global.currentStep === 0) {
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rewindPlayback();
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}
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const bpm = parseInt(document.getElementById("bpm-input").value, 10) || 120;
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Tone.Transport.bpm.value = bpm;
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const stepInterval = (60 * 1000) / (bpm * 4);
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if (appState.global.playbackIntervalId) clearInterval(appState.global.playbackIntervalId);
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appState.global.isPlaying = true;
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document.getElementById("play-btn").classList.remove("fa-play");
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document.getElementById("play-btn").classList.add("fa-pause");
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tick();
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appState.global.playbackIntervalId = setInterval(tick, stepInterval);
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}
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export function stopPlayback() {
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if(appState.global.playbackIntervalId) {
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clearInterval(appState.global.playbackIntervalId);
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}
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appState.global.playbackIntervalId = null;
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appState.global.isPlaying = false;
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document.querySelectorAll('.step.playing').forEach(s => s.classList.remove('playing'));
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appState.global.currentStep = 0;
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if (timerDisplay) timerDisplay.textContent = '00:00:00';
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const playBtn = document.getElementById("play-btn");
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if (playBtn) {
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playBtn.classList.remove("fa-pause");
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playBtn.classList.add("fa-play");
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}
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}
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export function rewindPlayback() {
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const lastStep = appState.global.currentStep > 0 ? appState.global.currentStep - 1 : getTotalSteps() - 1;
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appState.global.currentStep = 0;
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if (!appState.global.isPlaying) {
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if (timerDisplay) timerDisplay.textContent = '00:00:00';
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highlightStep(lastStep, false);
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}
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}
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export function togglePlayback() {
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initializeAudioContext();
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if (appState.global.isPlaying) {
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stopPlayback();
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} else {
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appState.global.currentStep = 0;
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startPlayback();
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}
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}
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// js/pattern_state.js
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import { DEFAULT_VOLUME, DEFAULT_PAN } from "../config.js";
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import { getAudioContext, getMainGainNode } from "../audio.js";
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import { renderPatternEditor } from "./pattern_ui.js";
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import { getTotalSteps } from "../utils.js";
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const initialState = {
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tracks: [],
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activeTrackId: null,
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activePatternIndex: 0,
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};
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export let patternState = { ...initialState };
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export function initializePatternState() {
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Object.assign(patternState, initialState, { tracks: [] });
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}
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// --- FUNÇÃO CORRIGIDA ---
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// Agora, esta função cria e pré-carrega um Tone.Player para a faixa.
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export async function loadAudioForTrack(track) {
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if (!track.samplePath) return track;
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try {
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// Se já existir um player antigo, o descartamos para liberar memória.
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if (track.player) {
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track.player.dispose();
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}
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// Cria um novo Tone.Player e o conecta à cadeia de áudio da faixa.
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// O 'await' garante que o áudio seja totalmente carregado antes de prosseguirmos.
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track.player = await new Tone.Player(track.samplePath).toDestination();
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track.player.chain(track.gainNode, track.pannerNode, getMainGainNode());
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} catch (error) {
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console.error(`Falha ao carregar áudio para a trilha ${track.name}:`, error);
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track.player = null;
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}
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return track;
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}
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export function addTrackToState() {
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const mainGainNode = getMainGainNode();
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const totalSteps = getTotalSteps();
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const referenceTrack = patternState.tracks[0];
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const newTrack = {
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id: Date.now(),
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name: "novo instrumento",
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samplePath: null,
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player: null, // <-- ADICIONADO: O player começará como nulo
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patterns: referenceTrack
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? referenceTrack.patterns.map(p => ({ name: p.name, steps: new Array(p.steps.length).fill(false), pos: p.pos }))
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: [{ name: "Pattern 1", steps: new Array(totalSteps).fill(false), pos: 0 }],
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activePatternIndex: 0,
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volume: DEFAULT_VOLUME,
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pan: DEFAULT_PAN,
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gainNode: new Tone.Gain(Tone.gainToDb(DEFAULT_VOLUME)),
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pannerNode: new Tone.Panner(DEFAULT_PAN),
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};
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newTrack.gainNode.chain(newTrack.pannerNode, mainGainNode);
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patternState.tracks.push(newTrack);
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renderPatternEditor();
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}
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export function removeLastTrackFromState() {
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if (patternState.tracks.length > 0) {
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const trackToRemove = patternState.tracks[patternState.tracks.length - 1];
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if (trackToRemove.player) trackToRemove.player.dispose();
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if (trackToRemove.pannerNode) trackToRemove.pannerNode.dispose();
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if (trackToRemove.gainNode) trackToRemove.gainNode.dispose();
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patternState.tracks.pop();
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renderPatternEditor();
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}
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}
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export async function updateTrackSample(trackId, samplePath) {
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const track = patternState.tracks.find((t) => t.id == trackId);
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if (track) {
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track.samplePath = samplePath;
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track.name = samplePath.split("/").pop();
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await loadAudioForTrack(track); // Carrega o novo player
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renderPatternEditor();
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}
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}
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export function toggleStepState(trackId, stepIndex) {
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const track = patternState.tracks.find((t) => t.id == trackId);
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if (track && track.patterns && track.patterns.length > 0) {
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const activePattern = track.patterns[track.activePatternIndex];
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if (activePattern && activePattern.steps.length > stepIndex) {
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activePattern.steps[stepIndex] = !activePattern.steps[stepIndex];
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}
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}
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}
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// js/pattern_ui.js
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import { appState } from "../state.js";
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import {
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toggleStepState,
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updateTrackSample
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} from "./pattern_state.js";
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import { playSample, stopPlayback } from "./pattern_audio.js"; // Será criado no próximo passo
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import { getTotalSteps } from "../utils.js";
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// Função principal de renderização para o editor de patterns
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export function renderPatternEditor() {
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const trackContainer = document.getElementById("track-container");
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trackContainer.innerHTML = "";
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appState.pattern.tracks.forEach((trackData) => {
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const trackLane = document.createElement("div");
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trackLane.className = "track-lane";
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trackLane.dataset.trackId = trackData.id;
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if (trackData.id === appState.pattern.activeTrackId) {
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trackLane.classList.add('active-track');
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}
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trackLane.innerHTML = `
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<div class="track-info">
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<i class="fa-solid fa-gear"></i>
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<div class="track-mute"></div>
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<span class="track-name">${trackData.name}</span>
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</div>
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<div class="track-controls">
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<div class="knob-container">
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<div class="knob" data-control="volume" data-track-id="${trackData.id}"><div class="knob-indicator"></div></div>
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<span>VOL</span>
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</div>
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<div class="knob-container">
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<div class="knob" data-control="pan" data-track-id="${trackData.id}"><div class="knob-indicator"></div></div>
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<span>PAN</span>
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</div>
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</div>
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<div class="step-sequencer-wrapper"></div>
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`;
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trackLane.addEventListener('click', () => {
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if (appState.pattern.activeTrackId === trackData.id) return;
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stopPlayback();
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appState.pattern.activeTrackId = trackData.id;
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document.querySelectorAll('.track-lane').forEach(lane => lane.classList.remove('active-track'));
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trackLane.classList.add('active-track');
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updateGlobalPatternSelector();
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redrawSequencer();
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});
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trackLane.addEventListener("dragover", (e) => { e.preventDefault(); trackLane.classList.add("drag-over"); });
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trackLane.addEventListener("dragleave", () => trackLane.classList.remove("drag-over"));
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trackLane.addEventListener("drop", (e) => {
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e.preventDefault();
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trackLane.classList.remove("drag-over");
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const filePath = e.dataTransfer.getData("text/plain");
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if (filePath) {
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updateTrackSample(trackData.id, filePath);
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}
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});
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trackContainer.appendChild(trackLane);
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// A lógica dos knobs precisará ser reimplementada ou movida para um arquivo de componentes
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});
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updateGlobalPatternSelector();
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redrawSequencer();
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}
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export function redrawSequencer() {
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const totalGridSteps = getTotalSteps();
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document.querySelectorAll(".step-sequencer-wrapper").forEach((wrapper) => {
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let sequencerContainer = wrapper.querySelector(".step-sequencer");
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if (!sequencerContainer) {
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sequencerContainer = document.createElement("div");
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sequencerContainer.className = "step-sequencer";
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wrapper.appendChild(sequencerContainer);
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}
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const parentTrackElement = wrapper.closest(".track-lane");
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const trackId = parentTrackElement.dataset.trackId;
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const trackData = appState.pattern.tracks.find((t) => t.id == trackId);
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if (!trackData || !trackData.patterns || trackData.patterns.length === 0) {
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sequencerContainer.innerHTML = ""; return;
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}
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const activePattern = trackData.patterns[appState.pattern.activePatternIndex];
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if (!activePattern) {
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sequencerContainer.innerHTML = ""; return;
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}
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const patternSteps = activePattern.steps;
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sequencerContainer.innerHTML = "";
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for (let i = 0; i < totalGridSteps; i++) {
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const stepWrapper = document.createElement("div");
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stepWrapper.className = "step-wrapper";
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const stepElement = document.createElement("div");
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stepElement.className = "step";
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if (patternSteps[i] === true) {
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stepElement.classList.add("active");
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}
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stepElement.addEventListener("click", () => {
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toggleStepState(trackData.id, i);
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stepElement.classList.toggle("active");
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if (trackData && trackData.samplePath) {
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playSample(trackData.samplePath, trackData.id);
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}
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});
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const beatsPerBar = parseInt(document.getElementById("compasso-a-input").value, 10) || 4;
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const groupIndex = Math.floor(i / beatsPerBar);
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if (groupIndex % 2 === 0) {
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stepElement.classList.add("step-dark");
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}
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const stepsPerBar = 16;
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if (i > 0 && i % stepsPerBar === 0) {
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const marker = document.createElement("div");
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marker.className = "step-marker";
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marker.textContent = Math.floor(i / stepsPerBar) + 1;
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stepWrapper.appendChild(marker);
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}
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stepWrapper.appendChild(stepElement);
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sequencerContainer.appendChild(stepWrapper);
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}
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});
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}
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export function updateGlobalPatternSelector() {
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const globalPatternSelector = document.getElementById('global-pattern-selector');
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if (!globalPatternSelector) return;
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const referenceTrack = appState.pattern.tracks[0];
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globalPatternSelector.innerHTML = '';
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if (referenceTrack && referenceTrack.patterns.length > 0) {
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referenceTrack.patterns.forEach((pattern, index) => {
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const option = document.createElement('option');
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option.value = index;
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option.textContent = pattern.name;
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globalPatternSelector.appendChild(option);
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});
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globalPatternSelector.selectedIndex = appState.pattern.activePatternIndex;
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globalPatternSelector.disabled = false;
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} else {
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const option = document.createElement('option');
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option.textContent = 'Sem patterns';
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globalPatternSelector.appendChild(option);
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globalPatternSelector.disabled = true;
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}
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}
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export function highlightStep(stepIndex, isActive) {
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if (stepIndex < 0) return;
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document.querySelectorAll(".track-lane").forEach((track) => {
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const stepWrapper = track.querySelector(
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`.step-sequencer .step-wrapper:nth-child(${stepIndex + 1})`
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);
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if (stepWrapper) {
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const stepElement = stepWrapper.querySelector(".step");
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if (stepElement) {
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stepElement.classList.toggle("playing", isActive);
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}
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}
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});
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}
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