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Fix pinch-to-zoom being misinterpreted as swipe navigation

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Multi-finger gestures like pinch-to-zoom were triggering photo
navigation because the touch handler didn't check touch count.
Move swipe detection to touchend, reject multi-touch gestures,
and require a minimum 40px horizontal distance.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Yorick van Pelt
2026-02-14 15:48:22 +01:00
parent d788391f4a
commit c862d14e45
1 changed files with 21 additions and 6 deletions
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27
public/js/photonav.js
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@@ -30,21 +30,38 @@ function disableKeyDownPropagation(obj) {
function enableTouchNavigation() {
var x_down = null;
var y_down = null;
var cancelled = false;
document.addEventListener('touchstart', function(event) {
if (event.touches.length > 1) {
cancelled = true;
return;
}
x_down = event.touches[0].clientX;
y_down = event.touches[0].clientY;
cancelled = false;
}, false);
document.addEventListener('touchmove', function(event) {
if (!x_down || !y_down) {
if (event.touches.length > 1) {
cancelled = true;
}
}, false);
document.addEventListener('touchend', function(event) {
if (cancelled || x_down === null || y_down === null) {
x_down = null;
y_down = null;
return;
}
var x_diff = x_down - event.touches[0].clientX;
var y_diff = y_down - event.touches[0].clientY;
var x_diff = x_down - event.changedTouches[0].clientX;
var y_diff = y_down - event.changedTouches[0].clientY;
if (Math.abs(y_diff) > 50) {
x_down = null;
y_down = null;
if (Math.abs(x_diff) < 40 || Math.abs(y_diff) > 50) {
return;
}
@@ -52,13 +69,11 @@ function enableTouchNavigation() {
if (x_diff > 0) {
var target = document.getElementById("previous_photo").href;
if (target) {
event.preventDefault();
document.location.href = target + '#photo_frame';
}
} else {
var target = document.getElementById("next_photo").href;
if (target) {
event.preventDefault();
document.location.href = target + '#photo_frame';
}
}