MediaWiki:Common.js: Difference between revisions

MediaWiki:Common.js (view source)

288 bytes added , 24 December 2023

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@@ Line 1: / Line 1: @@
 /* Restrict zooming out beyond the initial page size on mobile */
 var initialScale = 1;
+var pinchStartDistance;
-document.addEventListener('wheel', function(e) {
+document.addEventListener('gesturestart', function(e) {
-     if (e.deltaY < 0 && window.innerWidth <= window.screen.width) {
+     pinchStartDistance = getPinchDistance(e);
+});
+document.addEventListener('gesturechange', function(e) {
+    var pinchDistance = getPinchDistance(e);
+    if (pinchDistance > pinchStartDistance) {
          /* Zoom in */
          initialScale *= 1.1;
-     } else if (e.deltaY > 0 && window.innerWidth <= window.screen.width && initialScale > 1) {
+     } else if (pinchDistance < pinchStartDistance && initialScale > 1) {
          /* Zoom out */
          initialScale /= 1.1;
@@ Line 13: / Line 20: @@
      updateViewport();
 });
+function getPinchDistance(e) {
+    return Math.hypot(e.touches[0].clientX - e.touches[1].clientX, e.touches[0].clientY - e.touches[1].clientY);
+}
 function updateViewport() {