zoom funktion hinzugefügt

editor.py

@@ -283,7 +283,7 @@ h1 { margin:0 0 6px; font-size:28px; }
 .subtitle { color:#aaa; margin-bottom:22px; }
 .editor { background:#181818; border:1px solid #333; border-radius:10px; padding:20px; }
 .wave-wrap { position:relative; width:100%; height:240px; background:#0b0b0b; border-radius:6px; overflow:hidden; user-select:none; touch-action:none; }
-.wave-wrap img { width:100%; height:100%; object-fit:fill; display:block; opacity:.9; }
+.wave-image { position:absolute; top:0; left:0; width:100%; height:100%; object-fit:fill; display:block; opacity:.9; pointer-events:none; }
 .selection { position:absolute; top:0; bottom:0; background:rgba(80,150,255,.16); border-left:2px solid #fff; border-right:2px solid #fff; pointer-events:none; }
 .playhead { position:absolute; top:0; bottom:0; width:2px; margin-left:-1px; background:#ffcc33; box-shadow:0 0 5px #000; z-index:4; pointer-events:none; }
 .handle { position:absolute; top:0; bottom:0; width:18px; margin-left:-9px; cursor:ew-resize; z-index:3; touch-action:none; }
@@ -299,6 +299,7 @@ button.primary { background:#1769aa; }
 button.danger { background:#8b0000; }
 button:disabled { opacity:.45; cursor:not-allowed; }
 .position { margin-left:auto; color:#ccc; font-variant-numeric:tabular-nums; }
+.zoom { color:#aaa; font-variant-numeric:tabular-nums; }
 .values { display:grid; grid-template-columns:repeat(3,1fr); gap:12px; margin-top:20px; }
 .value { background:#222; border-radius:6px; padding:12px; }
 .value span { display:block; color:#999; font-size:13px; margin-bottom:5px; }
@@ -313,6 +314,7 @@ button:disabled { opacity:.45; cursor:not-allowed; }
  body { padding:12px; }
  .editor { padding:12px; }
  .wave-wrap { height:180px; }
+ .zoom { width:100%; margin-left:0; }
  .values { grid-template-columns:1fr; }
  .position { width:100%; margin-left:0; }
  button, a.button { flex:1 1 auto; }
@@ -327,15 +329,15 @@ button:disabled { opacity:.45; cursor:not-allowed; }
 
 <div class="editor">
   <div class="wave-wrap" id="wave">
-    <img src="{{ waveform_url }}" alt="Wellenform">
+    <img class="wave-image" id="waveImage" src="{{ waveform_url }}" alt="Wellenform">
     <div class="selection" id="selection"></div>
     <div class="playhead" id="playhead"></div>
     <div class="handle" id="startHandle" title="Anfang verschieben"></div>
     <div class="handle" id="endHandle" title="Ende verschieben"></div>
   </div>
   <div class="time-row">
-    <span>00:00:00</span>
-    <span>{{ duration }}</span>
+    <span id="viewStart">00:00:00</span>
+    <span id="viewEnd">{{ duration }}</span>
   </div>
 
   <audio id="audio" controls preload="metadata" style="width:100%;margin-top:18px">
@@ -351,6 +353,8 @@ button:disabled { opacity:.45; cursor:not-allowed; }
     <button onclick="playFromStart()">▶ Ab Auswahlstart</button>
     <button onclick="setStartAtCurrent()">⏱ Anfang = Position</button>
     <button onclick="setEndAtCurrent()">⏱ Ende = Position</button>
+    <button onclick="resetZoom()">↺ Gesamtansicht</button>
+    <span class="zoom" id="zoomValue">Zoom: 100 %</span>
     <span class="position" id="position">00:00:00</span>
   </div>
 
@@ -375,7 +379,14 @@ const filename = {{ filename|tojson }};
 let start = 0;
 let end = duration;
 let dragging = null;
+let zoom = 1;
+let viewStart = 0;
+let viewEnd = duration;
+const MIN_ZOOM = 1;
+const MAX_ZOOM = 16;
+const ZOOM_FACTOR = 1.5;
 const wave = document.getElementById('wave');
+const waveImage = document.getElementById('waveImage');
 const startHandle = document.getElementById('startHandle');
 const endHandle = document.getElementById('endHandle');
 const selection = document.getElementById('selection');
@@ -391,24 +402,70 @@ function fmt(sec) {
 }
 function xToTime(clientX) {
   const r = wave.getBoundingClientRect();
-  return Math.max(0, Math.min(duration, ((clientX-r.left)/r.width)*duration));
+  const ratio = Math.max(0, Math.min(1, (clientX-r.left)/r.width));
+  return viewStart + ratio * (viewEnd-viewStart);
+}
+function timeToPercent(t) {
+  const span = viewEnd-viewStart;
+  if (span <= 0) return 0;
+  return ((t-viewStart)/span)*100;
 }
 function render() {
-  const a = (start/duration)*100;
-  const b = (end/duration)*100;
+  const a = timeToPercent(start);
+  const b = timeToPercent(end);
   startHandle.style.left = a+'%';
   endHandle.style.left = b+'%';
   selection.style.left = a+'%';
-  selection.style.width = (b-a)+'%';
+  selection.style.width = Math.max(0, b-a)+'%';
+
+  const imageWidth = zoom * 100;
+  waveImage.style.width = imageWidth+'%';
+  waveImage.style.left = (-(viewStart/duration)*imageWidth)+'%';
+
   document.getElementById('startValue').textContent = fmt(start);
   document.getElementById('endValue').textContent = fmt(end);
   document.getElementById('keepValue').textContent = fmt(end-start);
+  document.getElementById('viewStart').textContent = fmt(viewStart);
+  document.getElementById('viewEnd').textContent = fmt(viewEnd);
+  document.getElementById('zoomValue').textContent = 'Zoom: '+Math.round(zoom*100)+' %';
   renderPlayhead();
 }
 function renderPlayhead() {
   const t = Math.max(0, Math.min(duration, audio.currentTime || 0));
-  playhead.style.left = ((t/duration)*100)+'%';
+  playhead.style.left = timeToPercent(t)+'%';
 }
+function setZoom(newZoom, clientX) {
+  newZoom = Math.max(MIN_ZOOM, Math.min(MAX_ZOOM, newZoom));
+  if (newZoom === zoom) return;
+
+  const r = wave.getBoundingClientRect();
+  let focusRatio = 0.5;
+  if (typeof clientX === 'number' && r.width > 0) {
+    focusRatio = Math.max(0, Math.min(1, (clientX-r.left)/r.width));
+  }
+
+  const oldSpan = viewEnd-viewStart;
+  const focusTime = viewStart + focusRatio*oldSpan;
+  const newSpan = duration/newZoom;
+  let newStart = focusTime-focusRatio*newSpan;
+  newStart = Math.max(0, Math.min(duration-newSpan, newStart));
+
+  zoom = newZoom;
+  viewStart = newStart;
+  viewEnd = newStart+newSpan;
+  render();
+}
+function resetZoom() {
+  zoom = 1;
+  viewStart = 0;
+  viewEnd = duration;
+  render();
+}
+wave.addEventListener('wheel', e => {
+  e.preventDefault();
+  const factor = e.deltaY < 0 ? ZOOM_FACTOR : 1/ZOOM_FACTOR;
+  setZoom(zoom*factor, e.clientX);
+}, {passive:false});
 function beginDrag(which, e) {
   e.preventDefault();
   dragging = which;