added code view

README.md

@@ -1,16 +1,7 @@
-# dart_star_pattern
+# Star Patterns in Dart
 
-A new Flutter project.
+My senior given this task.
 
-## Getting Started
+## Resources
 
-This project is a starting point for a Flutter application.
-
-A few resources to get you started if this is your first Flutter project:
-
-- [Lab: Write your first Flutter app](https://flutter.dev/docs/get-started/codelab)
-- [Cookbook: Useful Flutter samples](https://flutter.dev/docs/cookbook)
-
-For help getting started with Flutter, view our
-[online documentation](https://flutter.dev/docs), which offers tutorials,
-samples, guidance on mobile development, and a full API reference.
+- [Widget with codeview by X-Wei](https://github.com/X-Wei/widget_with_codeview) - I modified some code.

lib/codeviewer/source_code_view.dart

@@ -0,0 +1,66 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+
+import 'syntax_highlighter.dart';
+
+class SourceCodeView extends StatefulWidget {
+  final String filePath;
+
+  const SourceCodeView({
+    Key key,
+    @required this.filePath,
+  }) : super(key: key);
+
+  @override
+  _SourceCodeViewState createState() {
+    return _SourceCodeViewState();
+  }
+}
+
+class _SourceCodeViewState extends State<SourceCodeView> {
+  double _textScaleFactor = 1.0;
+  Widget _getCodeView(String codeContent, BuildContext context) {
+    final SyntaxHighlighterStyle style =
+        Theme.of(context).brightness == Brightness.dark
+            ? SyntaxHighlighterStyle.darkThemeStyle()
+            : SyntaxHighlighterStyle.lightThemeStyle();
+    return Container(
+      constraints: BoxConstraints.expand(),
+      child: SingleChildScrollView(
+        padding: EdgeInsets.only(left: 6, top: 8),
+        child: SelectableText.rich(
+          TextSpan(
+            style: TextStyle(fontFamily: 'monospace', fontSize: 12.0)
+                .apply(fontSizeFactor: this._textScaleFactor),
+            children: <TextSpan>[
+              DartSyntaxHighlighter(style).format(codeContent)
+            ],
+          ),
+          style: DefaultTextStyle.of(context)
+              .style
+              .apply(fontSizeFactor: this._textScaleFactor),
+        ),
+      ),
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return FutureBuilder(
+      future: DefaultAssetBundle.of(context).loadString(widget.filePath) ??
+          'Error loading source code from $this.filePath',
+      builder: (BuildContext context, AsyncSnapshot<String> snapshot) {
+        if (snapshot.hasData) {
+          return Scaffold(
+            body: Padding(
+              padding: EdgeInsets.all(4.0),
+              child: _getCodeView(snapshot.data, context),
+            ),
+          );
+        } else {
+          return Center(child: CircularProgressIndicator());
+        }
+      },
+    );
+  }
+}