Remove unnecessary _raster call in PdfPreview

 # Pdf for Dart and Flutter
 # Pdf for Dart and Flutter
 
 
-![Dart CI](https://github.com/DavBfr/dart_pdf/workflows/Dart%20CI/badge.svg)
-[![pub package](https://img.shields.io/pub/v/pdf.svg)](https://pub.dartlang.org/packages/pdf)
-[![pub package](https://img.shields.io/pub/v/printing.svg)](https://pub.dartlang.org/packages/printing)
-[![codecov](https://codecov.io/gh/DavBfr/dart_pdf/branch/master/graph/badge.svg)](https://codecov.io/gh/DavBfr/dart_pdf)
-
+![Dart CI](https://github.com/DavBfr/dart_pdf/workflows/Dart%20CI/badge.svg) [![pub package](https://img.shields.io/pub/v/pdf.svg)](https://pub.dartlang.org/packages/pdf) [![pub package](https://img.shields.io/pub/v/printing.svg)](https://pub.dartlang.org/packages/printing) [![codecov](https://codecov.io/gh/DavBfr/dart_pdf/branch/master/graph/badge.svg)](https://codecov.io/gh/DavBfr/dart_pdf)
 
 
 This set of plugins allows Flutter apps to generate and print pdf files to the device printer. This plugin works for iOS and Android.
 This set of plugins allows Flutter apps to generate and print pdf files to the device printer. This plugin works for iOS and Android.
 
 
-* dart pdf: <https://pub.dev/packages/pdf>
-* flutter printing: <https://pub.dev/packages/printing>
-* Live Demo: <https://davbfr.github.io/dart_pdf/>
+- dart pdf: <https://pub.dev/packages/pdf>
+- flutter printing: <https://pub.dev/packages/printing>
+- Live Demo: <https://davbfr.github.io/dart_pdf/>
 
 
 [![Buy Me A Coffee](https://bmc-cdn.nyc3.digitaloceanspaces.com/BMC-button-images/custom_images/orange_img.png "Buy Me A Coffee")](https://www.buymeacoffee.com/JORBmbw9h "Buy Me A Coffee")
 [![Buy Me A Coffee](https://bmc-cdn.nyc3.digitaloceanspaces.com/BMC-button-images/custom_images/orange_img.png "Buy Me A Coffee")](https://www.buymeacoffee.com/JORBmbw9h "Buy Me A Coffee")
+
+## Contributing
+
+Follow the instructions here: [contributing](CONTRIBUTING.md).
+
+A Makefile is available on the project root directory to download and prepare the dependencies.

@@ -66,10 +66,11 @@ class MyAppState extends State<MyApp> with SingleTickerProviderStateMixin {
       initialIndex: _tab,
       initialIndex: _tab,
     );
     );
     _tabController!.addListener(() {
     _tabController!.addListener(() {
-      setState(() {
-        _tab = _tabController!.index;
-        print('set state 1');
-      });
+      if (_tab != _tabController!.index) {
+        setState(() {
+          _tab = _tabController!.index;
+        });
+      }
       if (examples[_tab].needsData && !_hasData && !_pending) {
       if (examples[_tab].needsData && !_hasData && !_pending) {
         _pending = true;
         _pending = true;
         askName(context).then((value) {
         askName(context).then((value) {
@@ -86,7 +87,6 @@ class MyAppState extends State<MyApp> with SingleTickerProviderStateMixin {
 
 
     setState(() {
     setState(() {
       printingInfo = info;
       printingInfo = info;
-      print('set state 2');
     });
     });
   }
   }
 
 

@@ -3,6 +3,7 @@
 ## 5.0.5
 ## 5.0.5
 
 
 - Fix PdfPreview timer dispose [wwl901215]
 - Fix PdfPreview timer dispose [wwl901215]
+- Remove unnecessary _raster call in PdfPreview [yaymalaga]
 
 
 ## 5.0.4
 ## 5.0.4
 
 

@@ -128,6 +128,8 @@ class _PdfPreviewState extends State<PdfPreview> {
 
 
   Timer? previewUpdate;
   Timer? previewUpdate;
 
 
+  var _rastering = false;
+
   static const defaultPageFormats = <String, PdfPageFormat>{
   static const defaultPageFormats = <String, PdfPageFormat>{
     'A4': PdfPageFormat.a4,
     'A4': PdfPageFormat.a4,
     'Letter': PdfPageFormat.letter,
     'Letter': PdfPageFormat.letter,
@@ -138,6 +140,11 @@ class _PdfPreviewState extends State<PdfPreview> {
       : pageFormat;
       : pageFormat;
 
 
   Future<void> _raster() async {
   Future<void> _raster() async {
+    if (_rastering) {
+      return;
+    }
+    _rastering = true;
+
     Uint8List _doc;
     Uint8List _doc;
 
 
     if (!info.canRaster) {
     if (!info.canRaster) {
@@ -154,6 +161,7 @@ class _PdfPreviewState extends State<PdfPreview> {
         return true;
         return true;
       }());
       }());
 
 
+      _rastering = false;
       return;
       return;
     }
     }
 
 
@@ -177,6 +185,7 @@ class _PdfPreviewState extends State<PdfPreview> {
         informationCollector: collector,
         informationCollector: collector,
       ));
       ));
       error = exception;
       error = exception;
+      _rastering = false;
       return;
       return;
     }
     }
 
 
@@ -193,6 +202,7 @@ class _PdfPreviewState extends State<PdfPreview> {
       pages: widget.pages,
       pages: widget.pages,
     )) {
     )) {
       if (!mounted) {
       if (!mounted) {
+        _rastering = false;
         return;
         return;
       }
       }
       setState(() {
       setState(() {
@@ -213,6 +223,7 @@ class _PdfPreviewState extends State<PdfPreview> {
     }
     }
 
 
     pages.removeRange(pageNum, pages.length);
     pages.removeRange(pageNum, pages.length);
+    _rastering = false;
   }
   }
 
 
   @override
   @override
@@ -256,7 +267,6 @@ class _PdfPreviewState extends State<PdfPreview> {
     if (oldWidget.build != widget.build) {
     if (oldWidget.build != widget.build) {
       preview = null;
       preview = null;
       updatePosition = null;
       updatePosition = null;
-      pages.clear();
       _raster();
       _raster();
     }
     }
     super.didUpdateWidget(oldWidget);
     super.didUpdateWidget(oldWidget);