1 files changed, 8 insertions, 1 deletions
diff --git a/src/app.js b/src/app.js
index 3cdb59e..7f6baa3 100644
--- a/src/app.js
+++ b/src/app.js
@@ -695,9 +695,16 @@ function attachZoom(box, img, { wheel = true } = {}) {
     if (e.target.closest('.lightbox-x')) return;
     if (moved) { moved = false; e.stopImmediatePropagation(); e.preventDefault(); return; }
   }, true);
+  // The wheel. true: a turn zooms (the lightbox, a picture on its own).
+  // 'ctrl': ctrl+wheel zooms — a trackpad's pinch arrives in Chrome as
+  // exactly that — and a plain wheel pans the picture while it is zoomed;
+  // at 1× a plain wheel is left to whoever owns the box (the pager pages).
   if (wheel) box.addEventListener('wheel', (e) => {
+    const zoom = wheel !== 'ctrl' || e.ctrlKey || e.metaKey;
+    if (!zoom && s <= 1) return;
     e.preventDefault();
-    zoomAt(s * Math.exp(-e.deltaY * 0.002), e.clientX, e.clientY);
+    if (zoom) zoomAt(s * Math.exp(-e.deltaY * (wheel === 'ctrl' ? 0.004 : 0.002)), e.clientX, e.clientY);
+    else { x -= e.deltaX; y -= e.deltaY; }
     clamp(); apply(false);
   }, { passive: false });
 }