Handle mobile viewer

src/lib/util/misc.ts

@@ -7,4 +7,19 @@ export function clamp(num: number, min: number, max: number) {
 
 export function isReader() {
   return get(page).route.id === '/[manga]/[volume]'
+}
+
+let timer: any;
+
+export function debounce(func: () => void, timeout = 50) {
+  if (!timer) {
+    timer = setTimeout(() => {
+      func();
+      clearTimeout(timer);
+      timer = undefined;
+    }, timeout);
+  } else {
+    clearTimeout(timer);
+    timer = undefined;
+  }
 }