Updates

shower/shower.js

 /**
  * Core for Shower HTML presentation engine
- * @shower/core v3.0.0, https://github.com/shower/core
+ * @shower/core v3.1.0, https://github.com/shower/core
  * @copyright 2010–2021 Vadim Makeev, https://pepelsbey.net
  * @license MIT
  */
@@ -561,6 +561,41 @@
         window.addEventListener('resize', updateScale);
     };
 
+    var touch = (shower) => {
+        let exitFullScreen = false;
+        let clickable = false;
+
+        document.addEventListener('touchstart', (event) => {
+            if (event.touches.length === 1) {
+                const touch = event.touches[0];
+                const x = touch.clientX;
+                const { target } = touch;
+                clickable = target.tabIndex !== -1;
+                if (!clickable) {
+                    if (shower.isFullMode) {
+                        if (event.cancelable) event.preventDefault();
+                        if (window.innerWidth / 2 < x) {
+                            shower.next();
+                        } else {
+                            shower.prev();
+                        }
+                    }
+                }
+            } else if (event.touches.length === 3) {
+                exitFullScreen = true;
+            }
+        });
+
+        shower.container.addEventListener('touchend', (event) => {
+            if (exitFullScreen) {
+                event.preventDefault();
+                exitFullScreen = false;
+                shower.exitFullMode();
+            } else if (event.touches.length === 1 && !clickable && shower.isFullMode)
+                event.preventDefault();
+        });
+    };
+
     var installModules = (shower) => {
         a11y(shower);
         progress(shower);
@@ -570,6 +605,7 @@
         title(shower);
         location$1(shower); // should come after `title`
         view(shower);
+        touch(shower);
 
         // maintains invariant: active slide always exists in `full` mode
         if (shower.isFullMode && !shower.activeSlide) {