Animação de revelação de conteúdo do reprodutor de música
Conclua a animação de revelação de conteúdo no cenário do player de música: inclua conteúdo real, controles acionáveis, feedback claro de estado e um layout responsivo em diferentes tamanhos.
É possível editar, executar e salvar este exemplo após ativar JavaScript. O código-fonte fixo é o seguinte:
<!doctype html>
<html lang="pt-BR" dir="ltr">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Animação de revelação de conteúdo do reprodutor de música</title>
<style>
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@media (max-width:700px) { .mast h1 { line-height:1.08 !important; letter-spacing:-.035em !important; overflow-wrap:anywhere; } }
@media (prefers-reduced-motion:reduce) { *,*::before,*::after { scroll-behavior:auto !important; animation-duration:.01ms !important; animation-iteration-count:1 !important; transition-duration:.01ms !important; } }
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</head>
<body data-aesthetic="paper" data-composition="split-note">
<main class="page">
<header class="mast"><div><span class="eyebrow">paper / animação de revelação de conteúdo / BEGINNER</span><h1>Animação de revelação de conteúdo do reprodutor de música</h1><p class="intro">Conclua a animação de revelação de conteúdo no cenário do player de música: inclua conteúdo real, controles acionáveis, feedback claro de estado e um layout responsivo em diferentes tamanhos.</p></div><span class="scenario">Reprodutor de música</span></header>
<div class="composition-split"><aside class="split-note"><b>CASE 02</b><span>Dominar a estrutura semântica da animação de revelação de conteúdo, a organização responsiva, a operação por teclado e a sincronização de estado.</span></aside><section class="demo" aria-label="Área interativa de animação de revelação de conteúdo do player de música"><div class="workflow-compare"><form id="workflowCompareControls" class="compare-controls"><fieldset><legend>Canal de comparação</legend><label><input type="radio" name="workflowChannel" value="A" checked>A · versão original</label><label><input type="radio" name="workflowChannel" value="B">B · versão ao vivo</label></fieldset><label>Peso do progresso da reprodução<input id="workflowCompareWeight" type="range" min="10" max="90" value="50"><output id="workflowCompareWeightValue">50 %</output></label><label><input id="workflowCompareFreeze" type="checkbox">Congelar a versão atual</label><button id="workflowCompareCapture" class="action primary" type="button">Amostragem e salvamento da reprodução</button><ol id="workflowCompareShelf" aria-label="Versão de amostra de registro"></ol></form><section class="compare-stage"><header><span class="eyebrow">Player de música COMPARE</span><h2>Comparação entre duas versões da reprodução</h2><output id="workflowCompareLive">Versão A aguardando amostragem</output></header><section id="workflowCore" class="workflow-core compare-core" data-compare-channel="A" style="--compare-split:50%"><!-- 11DZ_CORE_START:animation-microinteractions-reveal-panel --><div class="reveal-demo panel"><header><span class="eyebrow">REVEAL PANEL</span><h2>Revelação de detalhes do tocador de música</h2><button id="revealControl" class="action primary" type="button" aria-expanded="false" aria-controls="revealContent" data-core-bridge="animation-microinteractions-reveal-panel">Expandir detalhes</button></header><section id="revealContent" class="reveal-content" hidden><div><span class="eyebrow">DISCOVERED</span><h3>Lembrete do tocador de música</h3><p>O conteúdo entra por meio de corte, opacidade e deslocamento, mas é exibido imediatamente quando a preferência por redução de movimento está ativada.</p><ul><li>Lembrete do tocador de música</li><li>Favoritos do reprodutor de música</li><li>Visão geral do player de música</li></ul></div></section></div><!-- 11DZ_CORE_END --></section></section></div><p id="status" class="status" role="status" aria-live="polite"></p></section></div>
</main>
<script>
'use strict';
const statusOutput = document.querySelector('#status');
const announce = message => { statusOutput.textContent = message; };
/* 11DZ_CORE_SCRIPT_START:animation-microinteractions-reveal-panel */
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/* 11DZ_CORE_SCRIPT_END */
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const workflowCompareCore=document.querySelector('#workflowCore');const workflowCompareWeight=document.querySelector('#workflowCompareWeight');const workflowCompareState={channel:'A',weight:50,frozen:false,snapshots:[]};function workflowCompareFingerprint(){const controls=[...workflowCompareCore.querySelectorAll('input,select,textarea')];const outputs=[...workflowCompareCore.querySelectorAll('output,[role="status"],strong')].map(node=>node.textContent.trim()).filter(Boolean);return {controlValues:controls.map(control=>control.type==='checkbox'||control.type==='radio'?control.checked:control.value),summary:outputs.slice(0,4).join(' / '),nodes:workflowCompareCore.querySelectorAll('*').length};}function workflowCompareDrive(){workflowCompareCore.dataset.compareChannel=workflowCompareState.channel;workflowCompareCore.style.setProperty('--compare-split',workflowCompareState.weight+'%');document.querySelector('#workflowCompareWeightValue').textContent=workflowCompareState.weight+' %';document.querySelector('#workflowCompareLive').textContent=workflowCompareState.channel+' Versão · '+workflowCompareState.weight+' %'+(workflowCompareState.frozen?' · Congelado':'');announce('Versão em reprodução em exibição '+workflowCompareState.channel+' Versão');}function workflowCompareCapture(source){const bridge=workflowBridgeActivate();const snapshot={...workflowCompareFingerprint(),channel:workflowCompareState.channel,weight:workflowCompareState.weight,source,bridge:bridge.summary};workflowCompareState.snapshots.push(snapshot);const item=document.createElement('li');item.innerHTML='<b>'+snapshot.channel+'</b><span>'+(snapshot.summary||snapshot.bridge)+'</span><small>'+snapshot.weight+' % · '+snapshot.bridge+'</small>';document.querySelector('#workflowCompareShelf').prepend(item);announce('amostrado '+snapshot.channel+' Salvar versão e reproduzir · '+bridge.summary);}document.querySelectorAll('[name="workflowChannel"]').forEach(input=>input.addEventListener('change',()=>{workflowCompareState.channel=input.value;workflowCompareDrive();}));workflowCompareWeight.addEventListener('input',()=>{workflowCompareState.weight=Number(workflowCompareWeight.value);workflowCompareDrive();});document.querySelector('#workflowCompareFreeze').addEventListener('change',event=>{workflowCompareState.frozen=event.currentTarget.checked;workflowCompareDrive();});document.querySelector('#workflowCompareCapture').addEventListener('click',()=>workflowCompareCapture('Amostra do botão'));workflowCompareCore.addEventListener('dblclick',()=>workflowCompareCapture('Vista principal com duplo clique'));workflowCompareDrive();
workflowBridgeReset();
</script>
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