v4/black_screen.html at main · 4simpleproblems/v4 · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1" />
  <title>Black Screen • Time & Battery</title>
  <style>
    :root{
      --bg:#000000;
      --hud:#2e2e2e;   /* dark grey text */
      --hud-dim:#555555;
      --ring:#1a1a1a;  /* subtle borders if needed */
    }
    html,body{ margin:0; height:100%; background:var(--bg); color:#d0d0d0; font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans"; }

    /* BLACKOUT MODE */
    body.blackout{ background:#000; cursor:none; }
    body.blackout .hud{ display:none; }

    /* HUD ELEMENTS */
    .hud{ position:fixed; z-index:2; font-size:12px; line-height:1.3; color:var(--hud); user-select:none; }

    /* Bottom-right: time & battery */
    #status{
      right:10px; bottom:10px; text-align:right; opacity:.9;
    }
    #clock{ font-variant-numeric: tabular-nums; }
    #battery{ margin-top:4px; color:var(--hud-dim); }

    /* Top-right: controls/help/settings */
    #controls{
      top:10px; right:10px; text-align:right; max-width:min(42ch, 70vw);
      background:transparent; padding:8px 10px; border-radius:8px;
    }
    #controls .title{ font-weight:700; color:var(--hud); margin-bottom:4px; opacity:.9; }
    #controls .row{ color:var(--hud-dim); }
    #controls kbd{ padding:2px 6px; border-radius:6px; border:1px solid var(--ring); background:#0d0d0d; color:#8a8a8a; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace; }
    #controls button{ margin-left:8px; padding:2px 6px; border-radius:6px; border:1px solid var(--ring); background:#0f0f0f; color:#8c8c8c; cursor:pointer; }
    #controls button:hover{ filter:brightness(1.1); }
    #controls .hint{ margin-top:6px; font-size:11px; color:#4b4b4b; }

    /* accessibility: allow clicking blank screen to exit */
    #exitLayer{ position:fixed; inset:0; display:none; background:transparent; border:none; }
    body.blackout #exitLayer{ display:block; }
  </style>
</head>
<body>
  <!-- TOP-RIGHT: keybinds & help -->
  <div id="controls" class="hud" aria-live="polite">
    <div class="title">Controls</div>
    <div class="row">Enter black mode: <kbd id="enterKeyLabel">Right Arrow</kbd><button id="rebindEnter" title="Click, then press any key">Change</button></div>
    <div class="row">Exit black mode: <kbd id="exitKeyLabel">Up Arrow</kbd><button id="rebindExit" title="Click, then press any key">Change</button></div>
    <div class="hint">Tip: <kbd>Esc</kbd> or click exits if you get stuck.</div>
  </div>

  <!-- BOTTOM-RIGHT: clock & battery -->
  <div id="status" class="hud">
    <div id="clock" aria-label="Current time">--:-- --</div>
    <div id="battery" aria-label="Battery status">Battery: --% • --</div>
  </div>

  <!-- clickable layer to exit blackout (failsafe) -->
  <button id="exitLayer" aria-label="Exit black mode"></button>

  <script>
    (function(){
      const pad = n => n.toString().padStart(2,'0');
      const clockEl = document.getElementById('clock');
      function updateClock(){
        const d = new Date();
        let h = d.getHours();
        const m = d.getMinutes();
        const ampm = h >= 12 ? 'pm' : 'am';
        h = h % 12; if (h === 0) h = 12;
        clockEl.textContent = `${h}:${pad(m)} ${ampm}`;
      }
      updateClock();
      setInterval(updateClock, 1000 * 15);

      // Battery API
      const batteryEl = document.getElementById('battery');
      function fmtBattery(b){
        const pct = Math.round(b.level * 100);
        const state = b.charging ? 'charging' : 'not charging';
        batteryEl.textContent = `Battery: ${pct}% • ${state}`;
      }
      if ('getBattery' in navigator) {
        navigator.getBattery().then(b => {
          fmtBattery(b);
          b.addEventListener('levelchange', () => fmtBattery(b));
          b.addEventListener('chargingchange', () => fmtBattery(b));
        }).catch(()=>{ batteryEl.textContent = 'Battery: unavailable'; });
      } else {
        batteryEl.textContent = 'Battery: unavailable';
      }

      // Keybinds
      const STORAGE_KEY = 'blackscreen_keybinds_v1';
      const defaults = { enter:'ArrowRight', exit:'ArrowUp' };
      const loadKeys = () => { try { return Object.assign({}, defaults, JSON.parse(localStorage.getItem(STORAGE_KEY)||'{}')); } catch { return {...defaults}; } };
      const saveKeys = (k) => { localStorage.setItem(STORAGE_KEY, JSON.stringify(k)); };

      let keys = loadKeys();
      const enterLbl = document.getElementById('enterKeyLabel');
      const exitLbl  = document.getElementById('exitKeyLabel');
      function refreshLabels(){
        enterLbl.textContent = labelFor(keys.enter);
        exitLbl.textContent = labelFor(keys.exit);
      }
      function labelFor(code){
        const map = { ArrowRight:'Right Arrow', ArrowUp:'Up Arrow', ArrowLeft:'Left Arrow', ArrowDown:'Down Arrow', Space:'Space', Escape:'Esc'};
        return map[code] || code;
      }
      refreshLabels();

      let capture = null; // 'enter' | 'exit' | null
      function beginCapture(which){
        capture = which;
        const btn = which==='enter' ? rebindEnter : rebindExit;
        const prev = which==='enter' ? keys.enter : keys.exit;
        btn.textContent = 'Press any key…';
        btn.disabled = true;
        const stop = ()=>{ capture=null; btn.textContent='Change'; btn.disabled=false; };
        const ondown = (e)=>{
          if(!capture) return;
          e.preventDefault();
          const code = e.code;
          // Disallow modifier-only keys
          if (code==='ShiftLeft'||code==='ShiftRight'||code==='ControlLeft'||code==='ControlRight'||code==='AltLeft'||code==='AltRight') return;
          if (capture==='enter') keys.enter = code; else keys.exit = code;
          saveKeys(keys); refreshLabels(); stop();
          window.removeEventListener('keydown', ondown, true);
        };
        window.addEventListener('keydown', ondown, true);
      }
      const rebindEnter = document.getElementById('rebindEnter');
      const rebindExit  = document.getElementById('rebindExit');
      rebindEnter.addEventListener('click', ()=> beginCapture('enter'));
      rebindExit.addEventListener('click',  ()=> beginCapture('exit'));

      // Black mode toggling
      const exitLayer = document.getElementById('exitLayer');
      function enterBlack(){ document.body.classList.add('blackout'); }
      function exitBlack(){ document.body.classList.remove('blackout'); }

      window.addEventListener('keydown', (e)=>{
        if (capture) return; // when rebinding, ignore
        if (document.body.classList.contains('blackout')){
          if (e.code === keys.exit || e.code === 'Escape') { e.preventDefault(); exitBlack(); }
        } else {
          if (e.code === keys.enter) { e.preventDefault(); enterBlack(); }
        }
      }, {passive:false});

      exitLayer.addEventListener('click', exitBlack);
    })();
  </script>
</body>
</html>