迁移 flutter2.0

lib/views/components/permanent/code/back/code_panel.dart

@@ -0,0 +1,66 @@
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+
+import '../high_light_code.dart';
+import '../highlighter_style.dart';
+
+
+class CodeWidget extends StatelessWidget {
+  CodeWidget({
+    Key key,
+    @required this.code,
+    this.style,
+    this.fontSize = 13,
+    this.fontFamily,
+  }) : super(key: key);
+
+  final String code;
+  final HighlighterStyle style;
+  final double fontSize;
+  final String fontFamily;
+  @override
+  Widget build(BuildContext context) {
+    if (code == null) {
+      return Container();
+    }
+
+    Widget _codeWidget = FutureBuilder(
+      future: compute(_hightlight, _HightlightArgs(style, code)),
+      builder: (context, snapshot) {
+        if (snapshot.hasError) {
+          return Text(code);
+        }
+        if (snapshot.hasData)
+          return RichText(
+            text: TextSpan(
+              children: <TextSpan>[snapshot.data],
+            ),
+          );
+        // computing
+        return SizedBox.shrink();
+      },
+    );
+
+    return SingleChildScrollView(
+      child: Container(
+        child: DefaultTextStyle(
+          child: _codeWidget,
+          style: TextStyle(fontSize: fontSize, fontFamily: fontFamily),
+        ),
+        padding: EdgeInsets.all(10),
+        decoration: BoxDecoration(
+            color: style.backgroundColor ?? Color(0xffF6F8FA),
+            borderRadius: BorderRadius.all(Radius.circular(5.0))),
+      ),
+    );
+  }
+}
+
+class _HightlightArgs {
+  final HighlighterStyle style;
+  final String code;
+  _HightlightArgs(this.style, this.code);
+}
+
+TextSpan _hightlight(_HightlightArgs args) =>
+    DartHighlighter(args.style).format(args.code);