Use logging library

lib/sheet_viewer_page.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:pdfrx/pdfrx.dart';
 import 'package:sheetless/api.dart';
 import 'package:sheetless/sheet.dart';
@@ -17,6 +18,7 @@ class SheetViewerPage extends StatefulWidget {
 class _SheetViewerPageState extends State<SheetViewerPage> {
   int page = 1;
   int numPages = 1;
+  bool isFullscreen = false;
 
   @override
   void initState() {
@@ -34,9 +36,23 @@ class _SheetViewerPageState extends State<SheetViewerPage> {
     return document;
   }
 
+  void toggleFullscreen() {
+    isFullscreen = !isFullscreen;
+    if (isFullscreen) {
+      print("enter fullscreen");
+      // enter fullscreen
+      SystemChrome.setEnabledSystemUIMode(SystemUiMode.immersiveSticky,
+          overlays: []);
+    } else {
+      // exit fullscreen
+      print("exit fullscreen");
+      SystemChrome.setEnabledSystemUIMode(SystemUiMode.edgeToEdge,
+          overlays: SystemUiOverlay.values);
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
-    print("Building with page: $page");
     return Scaffold(
       appBar: AppBar(
         title: Text(widget.sheet.name),
@@ -54,8 +70,16 @@ class _SheetViewerPageState extends State<SheetViewerPage> {
                   // Get the size of the screen
                   final screenWidth = MediaQuery.of(context).size.width;
 
+                  print("Touch at y = ${details.localPosition.dy}");
+                  print("Touch at x = ${details.localPosition.dx}");
+                  print("Screenwidth = ${screenWidth}");
                   // Check where the user tapped
-                  if (details.localPosition.dx < screenWidth / 2) {
+                  if (details.localPosition.dy < 100) {
+                    // TODO
+                    // setState(() {
+                    //   toggleFullscreen();
+                    // });
+                  } else if (details.localPosition.dx < screenWidth / 2) {
                     // Left half of the screen
                     setState(() {
                       page = page > 1 ? page - 1 : 1;