🐛 (fix) Displose widget when removing from widget tree. #1

Author: TheAlphamerc

example/lib/main.dart

@@ -9,7 +9,7 @@ class MyApp extends StatelessWidget {
     return MaterialApp(
       title: 'Flutter Demo',
       theme: ThemeData(
-         primarySwatch: Colors.blue,
+        primarySwatch: Colors.blue,
       ),
       home: MyHomePage(title: 'Empty widget demo'),
     );
@@ -19,7 +19,7 @@ class MyApp extends StatelessWidget {
 class MyHomePage extends StatefulWidget {
   MyHomePage({Key key, this.title}) : super(key: key);
 
- final String title;
+  final String title;
 
   @override
   _MyHomePageState createState() => _MyHomePageState();
@@ -33,19 +33,25 @@ class _MyHomePageState extends State<MyHomePage> {
         title: Text(widget.title),
       ),
       body: Center(
-        child: Container(
-            height: 500,
-            width:350,
-          child:  EmptyListWidget(
-            image : null,
+          child: Container(
+        height: 500,
+        width: 350,
+        child: EmptyListWidget(
+            image: null,
             packageImage: PackageImage.Image_1,
             title: 'Title here',
             subTitle: 'Some text  here',
-            titleTextStyle: Theme.of(context).typography.dense.display1.copyWith(color: Color(0xff9da9c7)),
-            subtitleTextStyle: Theme.of(context).typography.dense.body2.copyWith(color: Color(0xffabb8d6))
-         ),
-        )
-      ),
+            titleTextStyle: Theme.of(context)
+                .typography
+                .dense
+                .headline5
+                .copyWith(color: Color(0xff9da9c7)),
+            subtitleTextStyle: Theme.of(context)
+                .typography
+                .dense
+                .bodyText1
+                .copyWith(color: Color(0xffabb8d6))),
+      )),
     );
   }
 }

example/pubspec.lock

@@ -7,28 +7,42 @@ packages:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.3.0"
+    version: "2.5.0"
   boolean_selector:
     dependency: transitive
     description:
       name: boolean_selector
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.5"
+    version: "2.1.0"
+  characters:
+    dependency: transitive
+    description:
+      name: characters
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.0"
   charcode:
     dependency: transitive
     description:
       name: charcode
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.2"
+    version: "1.2.0"
+  clock:
+    dependency: transitive
+    description:
+      name: clock
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.0"
   collection:
     dependency: transitive
     description:
       name: collection
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.14.11"
+    version: "1.15.0"
   cupertino_icons:
     dependency: "direct main"
     description:
@@ -43,6 +57,13 @@ packages:
       relative: true
     source: path
     version: "0.0.1"
+  fake_async:
+    dependency: transitive
+    description:
+      name: fake_async
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.2.0"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -59,35 +80,21 @@ packages:
       name: matcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.5"
+    version: "0.12.10"
   meta:
     dependency: transitive
     description:
       name: meta
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.7"
+    version: "1.3.0"
   path:
     dependency: transitive
     description:
       name: path
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.6.4"
-  pedantic:
-    dependency: transitive
-    description:
-      name: pedantic
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.8.0+1"
-  quiver:
-    dependency: transitive
-    description:
-      name: quiver
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.0.5"
+    version: "1.8.0"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -99,55 +106,55 @@ packages:
       name: source_span
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.5.5"
+    version: "1.8.0"
   stack_trace:
     dependency: transitive
     description:
       name: stack_trace
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.9.3"
+    version: "1.10.0"
   stream_channel:
     dependency: transitive
     description:
       name: stream_channel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0"
+    version: "2.1.0"
   string_scanner:
     dependency: transitive
     description:
       name: string_scanner
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.5"
+    version: "1.1.0"
   term_glyph:
     dependency: transitive
     description:
       name: term_glyph
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0"
+    version: "1.2.0"
   test_api:
     dependency: transitive
     description:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.5"
+    version: "0.2.19"
   typed_data:
     dependency: transitive
     description:
       name: typed_data
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.6"
+    version: "1.3.0"
   vector_math:
     dependency: transitive
     description:
       name: vector_math
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.8"
+    version: "2.1.0"
 sdks:
-  dart: ">=2.2.2 <3.0.0"
+  dart: ">=2.12.0-0.0 <3.0.0"

example/pubspec.yaml

@@ -14,7 +14,7 @@ description: A new Flutter project.
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.1.0 <3.0.0"
+  sdk: ">=2.7.0 <3.0.0"
 
 dependencies:
   flutter: