From 939a4e9c57d7e322a63ae41522ef892a1b089733 Mon Sep 17 00:00:00 2001
From: Tim Rijkse <trijkse@gmail.com>
Date: Fri, 16 Jan 2026 09:52:16 +0100
Subject: [PATCH] fix: zoom

---
 js/components/image-gallery.js | 85 +++++++++++++++++++++++++++++++++-
 1 file changed, 84 insertions(+), 1 deletion(-)

diff --git a/js/components/image-gallery.js b/js/components/image-gallery.js
index 4b7fbd5..21403ce 100644
--- a/js/components/image-gallery.js
+++ b/js/components/image-gallery.js
@@ -16,6 +16,10 @@ class ImageGallery extends HTMLElement {
     this.startY = 0;
     this.lastTranslateX = 0;
     this.lastTranslateY = 0;
+    
+    // Pinch zoom state
+    this.initialPinchDistance = 0;
+    this.initialZoom = 1;
   }
 
   connectedCallback() {
@@ -90,7 +94,81 @@ class ImageGallery extends HTMLElement {
 
       // Prevent default drag behavior
       modalImage.addEventListener("dragstart", (e) => e.preventDefault());
+
+      // Mouse wheel zoom
+      modalImage.addEventListener("wheel", (e) => this.handleWheel(e), { passive: false });
     }
+
+    // Pinch zoom for touch devices on modal content
+    const modalContent = this.shadowRoot.querySelector(".modal-content");
+    if (modalContent) {
+      modalContent.addEventListener("touchstart", (e) => this.handleTouchStart(e), { passive: false });
+      modalContent.addEventListener("touchmove", (e) => this.handleTouchMove(e), { passive: false });
+      modalContent.addEventListener("touchend", (e) => this.handleTouchEnd(e));
+      
+      // Prevent default browser gestures on the modal
+      modalContent.addEventListener("gesturestart", (e) => e.preventDefault());
+      modalContent.addEventListener("gesturechange", (e) => e.preventDefault());
+      modalContent.addEventListener("gestureend", (e) => e.preventDefault());
+    }
+  }
+
+  handleWheel(e) {
+    e.preventDefault();
+    e.stopPropagation();
+    
+    const delta = e.deltaY > 0 ? -0.1 : 0.1;
+    this.zoom(delta);
+  }
+
+  handleTouchStart(e) {
+    if (e.touches.length === 2) {
+      // Pinch zoom start
+      e.preventDefault();
+      this.initialPinchDistance = this.getPinchDistance(e.touches);
+      this.initialZoom = this.currentZoom;
+    } else if (e.touches.length === 1 && this.currentZoom > 1) {
+      // Single touch drag when zoomed
+      this.startDrag(e);
+    }
+  }
+
+  handleTouchMove(e) {
+    if (e.touches.length === 2) {
+      // Pinch zoom
+      e.preventDefault();
+      const currentDistance = this.getPinchDistance(e.touches);
+      const scale = currentDistance / this.initialPinchDistance;
+      const newZoom = Math.max(1, Math.min(4, this.initialZoom * scale));
+      
+      this.currentZoom = newZoom;
+      
+      if (this.currentZoom === 1) {
+        this.translateX = 0;
+        this.translateY = 0;
+      }
+      
+      this.updateImageTransform();
+      
+      const modalImage = this.shadowRoot.querySelector(".modal-image");
+      if (modalImage) {
+        modalImage.style.cursor = this.currentZoom > 1 ? "grab" : "default";
+      }
+    } else if (e.touches.length === 1 && this.isDragging) {
+      // Single touch drag
+      this.drag(e);
+    }
+  }
+
+  handleTouchEnd(e) {
+    this.initialPinchDistance = 0;
+    this.endDrag();
+  }
+
+  getPinchDistance(touches) {
+    const dx = touches[0].clientX - touches[1].clientX;
+    const dy = touches[0].clientY - touches[1].clientY;
+    return Math.sqrt(dx * dx + dy * dy);
   }
 
   startDrag(e) {
@@ -263,6 +341,8 @@ class ImageGallery extends HTMLElement {
           background-color: rgba(0, 0, 0, 0.95);
           z-index: 1000;
           flex-direction: column;
+          touch-action: none;
+          -webkit-touch-callout: none;
         }
 
         .modal-overlay.open {
@@ -321,11 +401,13 @@ class ImageGallery extends HTMLElement {
 
         .modal-content {
           flex: 1;
-          overflow: auto;
+          overflow: hidden;
           display: flex;
           align-items: center;
           justify-content: center;
           padding: var(--spacing-md, 1rem);
+          touch-action: none;
+          -webkit-touch-callout: none;
         }
 
         .modal-image {
@@ -336,6 +418,7 @@ class ImageGallery extends HTMLElement {
           cursor: default;
           user-select: none;
           -webkit-user-drag: none;
+          touch-action: none;
         }
       </style>