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243 lines
7.1 KiB
Markdown
243 lines
7.1 KiB
Markdown
# CodeField
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A customizable code text field supporting syntax highlighting
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[](https://pub.dev/packages/code_text_field)
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[](https://bertrandbev.github.io/code_field/)
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[](https://raw.githubusercontent.com/BertrandBev/code_field/master/LICENSE)
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[](https://github.com/Solido/awesome-flutter)
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<img src="https://raw.githubusercontent.com/BertrandBev/code_field/master/doc/images/top.gif" width="70%">
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## Live demo
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A [live demo](https://bertrandbev.github.io/code_field/#/) showcasing a few language / theme combinations
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## Showcase
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The experimental VM [dlox](https://github.com/BertrandBev/dlox) uses **CodeField** in its [online editor](https://bertrandbev.github.io/dlox/#/)
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## Features
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- Code highlight for 189 built-in languages with 90 themes thanks to [flutter_highlight](https://pub.dev/packages/flutter_highlight)
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- Easy language highlight customization through the use of theme maps
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- Fully customizable code field style through a TextField like API
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- Handles horizontal/vertical scrolling and vertical expansion
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- Supports code modifiers
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- Works on Android, iOS, and Web
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Code modifiers help manage indents automatically
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<img src="https://raw.githubusercontent.com/BertrandBev/code_field/master/doc/images/typing.gif" width="70%">
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The editor is wrapped in a horizontal scrollable container to handle long lines
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<img src="https://raw.githubusercontent.com/BertrandBev/code_field/master/doc/images/long_line.gif" width="70%">
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## Installing
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In the `pubspec.yaml` of your flutter project, add the following dependency:
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```yaml
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dependencies:
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...
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code_text_field: <latest_version>
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```
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[latest version](https://pub.dev/packages/code_text_field/install)
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In your library add the following import:
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```dart
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import 'package:code_text_field/code_field.dart';
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```
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## Simple example
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A CodeField widget works with a **CodeController** which dynamically parses the text input according to a language and renders it with a theme map
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```dart
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import 'package:flutter/material.dart';
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import 'package:code_text_field/code_field.dart';
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// Import the language & theme
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import 'package:highlight/languages/dart.dart';
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import 'package:flutter_highlight/themes/monokai-sublime.dart';
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class CodeEditor extends StatefulWidget {
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@override
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_CodeEditorState createState() => _CodeEditorState();
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}
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class _CodeEditorState extends State<CodeEditor> {
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CodeController? _codeController;
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@override
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void initState() {
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super.initState();
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final source = "void main() {\n print(\"Hello, world!\");\n}";
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// Instantiate the CodeController
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_codeController = CodeController(
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text: source,
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language: dart,
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theme: monokaiSublimeTheme,
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);
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}
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@override
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void dispose() {
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_codeController?.dispose();
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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return CodeField(
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controller: _codeController!,
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textStyle: TextStyle(fontFamily: 'SourceCode'),
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);
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}
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}
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```
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<img src="https://raw.githubusercontent.com/BertrandBev/code_field/master/doc/images/example_0.png" width="60%">
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Here, the monospace font [Source Code Pro](https://fonts.google.com/specimen/Source+Code+Pro?preview.text_type=custom) has been added to the assets folder and to the [pubspec.yaml](https://github.com/BertrandBev/code_field/blob/master/example/pubspec.yaml) file
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## Parser options
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On top of a language definition, world-wise styling can be specified in the **stringMap** field
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```dart
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_codeController = CodeController(
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//...
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stringMap: {
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"Hello": TextStyle(fontWeight: FontWeight.bold, color: Colors.red),
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"world": TextStyle(fontStyle: FontStyle.italic, color: Colors.green),
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},
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);
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```
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<img src="https://raw.githubusercontent.com/BertrandBev/code_field/master/doc/images/example_1.png" width="60%">
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More complex regexes may also be used with the **patternMap**. When a language is used though, its regexes patterns take precedence over **patternMap** and **stringMap**.
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```dart
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_codeController = CodeController(
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//...
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patternMap: {
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r"\B#[a-zA-Z0-9]+\b":
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TextStyle(fontWeight: FontWeight.bold, color: Colors.purpleAccent),
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},
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);
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```
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<img src="https://raw.githubusercontent.com/BertrandBev/code_field/master/doc/images/example_2.png" width="60%">
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Both **patternMap** and **stringMap** can be used without specifying a language
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```dart
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_codeController = CodeController(
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text: source,
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patternMap: {
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r'".*"': TextStyle(color: Colors.yellow),
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r'[a-zA-Z0-9]+\(.*\)': TextStyle(color: Colors.green),
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},
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stringMap: {
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"void": TextStyle(fontWeight: FontWeight.bold, color: Colors.red),
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"print": TextStyle(fontWeight: FontWeight.bold, color: Colors.blue),
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},
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);
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```
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<img src="https://raw.githubusercontent.com/BertrandBev/code_field/master/doc/images/example_3.png" width="60%">
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## Code Modifiers
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Code modifiers can be created to react to special keystrokes.
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The default modifiers handle tab to space & automatic indentation. Here's the implementation of the default **TabModifier**
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```dart
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class TabModifier extends CodeModifier {
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const TabModifier() : super('\t');
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@override
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TextEditingValue? updateString(
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String text, TextSelection sel, EditorParams params) {
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final tmp = replace(text, sel.start, sel.end, " " * params.tabSpaces);
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return tmp;
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}
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}
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```
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## API
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### CodeField
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```dart
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CodeField({
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Key? key,
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required this.controller,
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this.minLines,
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this.maxLines,
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this.expands = false,
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this.wrap = false,
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this.background,
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this.decoration,
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this.textStyle,
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this.padding = const EdgeInsets.symmetric(),
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this.lineNumberStyle = const LineNumberStyle(),
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this.enabled,
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this.cursorColor,
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this.textSelectionTheme,
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this.lineNumberBuilder,
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this.focusNode,
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this.onTap,
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})
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```
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```dart
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LineNumberStyle({
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this.width = 42.0,
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this.textAlign = TextAlign.right,
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this.margin = 10.0,
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this.textStyle,
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this.background,
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})
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```
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### CodeController
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```dart
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CodeController({
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String? text,
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this.language,
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this.theme,
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this.patternMap,
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this.stringMap,
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this.params = const EditorParams(),
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this.modifiers = const <CodeModifier>[
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const IntendModifier(),
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const CloseBlockModifier(),
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const TabModifier(),
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],
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this.onChange,
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})
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```
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## Limitations
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- Autocomplete disabling on android [doesn't work yet](https://github.com/flutter/flutter/issues/71679)
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- The TextField cursor doesn't seem to be handling space inputs properly on the web platform. Pending [issue resolution](https://github.com/flutter/flutter/issues/77929). The flag `webSpaceFix` fixes it by swapping spaces with transparent middle points.
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## Notes
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A [breaking change](https://flutter.dev/docs/release/breaking-changes/buildtextspan-buildcontext) to the `TextEditingController` was introduced in flutter beta, dev & master channels. The branch [beta](https://github.com/BertrandBev/code_field/tree/beta) should comply with those changes.
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