From 2049a18786e8a18d33a2146f8c69617f05000b38 Mon Sep 17 00:00:00 2001
From: Thiago Bomfim <thiagobomfim1995@gmail.com>
Date: Thu, 6 Aug 2020 14:12:53 -0300
Subject: [PATCH] Hide BottomNavigationBar when document have just one page.

---
 lib/src/viewer.dart | 109 ++++++++++++++++++++++----------------------
 1 file changed, 55 insertions(+), 54 deletions(-)

diff --git a/lib/src/viewer.dart b/lib/src/viewer.dart
index 9326a223..18f12845 100644
--- a/lib/src/viewer.dart
+++ b/lib/src/viewer.dart
@@ -140,64 +140,65 @@ class _PDFViewerState extends State<PDFViewer> {
             )
           : null,
       floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
-      bottomNavigationBar: (widget.showNavigation || widget.document.count > 1)
-          ? BottomAppBar(
-              child: new Row(
-                mainAxisAlignment: MainAxisAlignment.center,
-                children: <Widget>[
-                  Expanded(
-                    child: IconButton(
-                      icon: Icon(Icons.first_page),
-                      tooltip: widget.tooltip.first,
-                      onPressed: () {
-                        _pageNumber = 1;
-                        _loadPage();
-                      },
-                    ),
-                  ),
-                  Expanded(
-                    child: IconButton(
-                      icon: Icon(Icons.chevron_left),
-                      tooltip: widget.tooltip.previous,
-                      onPressed: () {
-                        _pageNumber--;
-                        if (1 > _pageNumber) {
-                          _pageNumber = 1;
-                        }
-                        _loadPage();
-                      },
-                    ),
+      bottomNavigationBar: Visibility(
+          visible: (widget.showNavigation && widget.document.count > 1),
+          child: BottomAppBar(
+            child: new Row(
+              mainAxisAlignment: MainAxisAlignment.center,
+              children: <Widget>[
+                Expanded(
+                  child: IconButton(
+                    icon: Icon(Icons.first_page),
+                    tooltip: widget.tooltip.first,
+                    onPressed: () {
+                      _pageNumber = 1;
+                      _loadPage();
+                    },
                   ),
-                  widget.showPicker
-                      ? Expanded(child: Text(''))
-                      : SizedBox(width: 1),
-                  Expanded(
-                    child: IconButton(
-                      icon: Icon(Icons.chevron_right),
-                      tooltip: widget.tooltip.next,
-                      onPressed: () {
-                        _pageNumber++;
-                        if (widget.document.count < _pageNumber) {
-                          _pageNumber = widget.document.count;
-                        }
-                        _loadPage();
-                      },
-                    ),
+                ),
+                Expanded(
+                  child: IconButton(
+                    icon: Icon(Icons.chevron_left),
+                    tooltip: widget.tooltip.previous,
+                    onPressed: () {
+                      _pageNumber--;
+                      if (1 > _pageNumber) {
+                        _pageNumber = 1;
+                      }
+                      _loadPage();
+                    },
                   ),
-                  Expanded(
-                    child: IconButton(
-                      icon: Icon(Icons.last_page),
-                      tooltip: widget.tooltip.last,
-                      onPressed: () {
+                ),
+                widget.showPicker
+                    ? Expanded(child: Text(''))
+                    : SizedBox(width: 1),
+                Expanded(
+                  child: IconButton(
+                    icon: Icon(Icons.chevron_right),
+                    tooltip: widget.tooltip.next,
+                    onPressed: () {
+                      _pageNumber++;
+                      if (widget.document.count < _pageNumber) {
                         _pageNumber = widget.document.count;
-                        _loadPage();
-                      },
-                    ),
+                      }
+                      _loadPage();
+                    },
                   ),
-                ],
-              ),
-            )
-          : Container(),
+                ),
+                Expanded(
+                  child: IconButton(
+                    icon: Icon(Icons.last_page),
+                    tooltip: widget.tooltip.last,
+                    onPressed: () {
+                      _pageNumber = widget.document.count;
+                      _loadPage();
+                    },
+                  ),
+                ),
+              ],
+            ),
+          )
+      ),
     );
   }
 }