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Refactor focusing to contextLine (apache#24613)
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139 changes: 139 additions & 0 deletions
139
playground/frontend/playground_components/lib/src/widgets/editor_text_area.dart
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,139 @@ | ||
| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you under the Apache License, Version 2.0 (the | ||
| * "License"); you may not use this file except in compliance | ||
| * with the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
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| // TODO(alexeyinkin): Refactor this, merge into snippet_editor.dart | ||
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| import 'dart:math'; | ||
|
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| import 'package:flutter/material.dart'; | ||
| import 'package:flutter/scheduler.dart'; | ||
| import 'package:flutter_code_editor/flutter_code_editor.dart'; | ||
|
|
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| import '../controllers/snippet_editing_controller.dart'; | ||
| import '../theme/theme.dart'; | ||
|
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| class EditorTextArea extends StatefulWidget { | ||
| final SnippetEditingController controller; | ||
| final bool isEditable; | ||
|
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| EditorTextArea({ | ||
| required this.controller, | ||
| required this.isEditable, | ||
| }) : super( | ||
| // When the example is changed, will scroll to the context line again. | ||
| key: ValueKey(controller.selectedExample), | ||
| ); | ||
|
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| @override | ||
| State<EditorTextArea> createState() => _EditorTextAreaState(); | ||
| } | ||
|
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| class _EditorTextAreaState extends State<EditorTextArea> { | ||
| bool _didAutoFocus = false; | ||
| final _focusNode = FocusNode(); | ||
| final _scrollController = ScrollController(); | ||
| final _sizeKey = LabeledGlobalKey('CodeFieldKey'); | ||
|
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| @override | ||
| void didChangeDependencies() { | ||
| super.didChangeDependencies(); | ||
|
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| if (!_didAutoFocus) { | ||
| _didAutoFocus = true; | ||
| SchedulerBinding.instance.addPostFrameCallback((_) { | ||
| if (mounted) { | ||
| _scrollSoCursorIsOnTop(); | ||
| } | ||
| }); | ||
| } | ||
| } | ||
|
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| void _scrollSoCursorIsOnTop() { | ||
| _focusNode.requestFocus(); | ||
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| final position = max(widget.controller.codeController.selection.start, 0); | ||
| final characterOffset = _getLastCharacterOffset( | ||
| text: widget.controller.codeController.text.substring(0, position), | ||
| style: kLightTheme.extension<BeamThemeExtension>()!.codeRootStyle, | ||
| ); | ||
|
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| _scrollController.jumpTo( | ||
| min( | ||
| characterOffset.dy, | ||
| _scrollController.position.maxScrollExtent, | ||
| ), | ||
| ); | ||
| } | ||
|
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| @override | ||
| void dispose() { | ||
| super.dispose(); | ||
| _focusNode.dispose(); | ||
| } | ||
|
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| @override | ||
| Widget build(BuildContext context) { | ||
| final ext = Theme.of(context).extension<BeamThemeExtension>()!; | ||
| final isMultifile = widget.controller.selectedExample?.isMultiFile ?? false; | ||
| final isEnabled = widget.isEditable && !isMultifile; | ||
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| return Semantics( | ||
| container: true, | ||
| textField: true, | ||
| multiline: true, | ||
| enabled: isEnabled, | ||
| readOnly: isEnabled, | ||
| label: 'widgets.codeEditor.label', | ||
| child: FocusScope( | ||
| key: _sizeKey, | ||
| node: FocusScopeNode(canRequestFocus: isEnabled), | ||
| child: CodeTheme( | ||
| data: ext.codeTheme, | ||
| child: Container( | ||
| color: ext.codeTheme.styles['root']?.backgroundColor, | ||
| child: SingleChildScrollView( | ||
| controller: _scrollController, | ||
| child: CodeField( | ||
| key: ValueKey(widget.controller.codeController), | ||
| focusNode: _focusNode, | ||
| enabled: isEnabled, | ||
| controller: widget.controller.codeController, | ||
| textStyle: ext.codeRootStyle, | ||
| ), | ||
| ), | ||
| ), | ||
| ), | ||
| ), | ||
| ); | ||
| } | ||
| } | ||
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| Offset _getLastCharacterOffset({ | ||
| required String text, | ||
| required TextStyle style, | ||
| }) { | ||
| final textPainter = TextPainter( | ||
| textDirection: TextDirection.ltr, | ||
| text: TextSpan(text: text, style: style), | ||
| )..layout(); | ||
|
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| return textPainter.getOffsetForCaret( | ||
| TextPosition(offset: text.length), | ||
| Rect.zero, | ||
| ); | ||
| } |
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