| // Copyright 2013 The Flutter Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| import 'dart:js_interop'; |
| |
| import 'package:flutter/cupertino.dart' show CupertinoTheme; |
| import 'package:flutter/material.dart' show Theme; |
| import 'package:flutter/widgets.dart'; |
| import 'package:path/path.dart' as p; |
| |
| import 'style_sheet.dart'; |
| import 'widget.dart'; |
| |
| /// Type for a function that creates image widgets. |
| typedef ImageBuilder = Widget Function( |
| Uri uri, String? imageDirectory, double? width, double? height); |
| |
| /// A default image builder handling http/https, resource, data, and file URLs. |
| // ignore: prefer_function_declarations_over_variables |
| final ImageBuilder kDefaultImageBuilder = ( |
| Uri uri, |
| String? imageDirectory, |
| double? width, |
| double? height, |
| ) { |
| if (uri.scheme == 'http' || uri.scheme == 'https') { |
| return Image.network(uri.toString(), width: width, height: height); |
| } else if (uri.scheme == 'data') { |
| return _handleDataSchemeUri(uri, width, height); |
| } else if (uri.scheme == 'resource') { |
| return Image.asset(uri.path, width: width, height: height); |
| } else { |
| final Uri fileUri = imageDirectory != null |
| ? Uri.parse(p.join(imageDirectory, uri.toString())) |
| : uri; |
| if (fileUri.scheme == 'http' || fileUri.scheme == 'https') { |
| return Image.network(fileUri.toString(), width: width, height: height); |
| } else { |
| final String src = p.join(p.current, fileUri.toString()); |
| return Image.network(src, width: width, height: height); |
| } |
| } |
| }; |
| |
| /// A default style sheet generator. |
| final MarkdownStyleSheet Function(BuildContext, MarkdownStyleSheetBaseTheme?) |
| // ignore: prefer_function_declarations_over_variables |
| kFallbackStyle = ( |
| BuildContext context, |
| MarkdownStyleSheetBaseTheme? baseTheme, |
| ) { |
| final MarkdownStyleSheet result = switch (baseTheme) { |
| MarkdownStyleSheetBaseTheme.platform |
| when _userAgent.toDart.contains('Mac OS X') => |
| MarkdownStyleSheet.fromCupertinoTheme(CupertinoTheme.of(context)), |
| MarkdownStyleSheetBaseTheme.cupertino => |
| MarkdownStyleSheet.fromCupertinoTheme(CupertinoTheme.of(context)), |
| _ => MarkdownStyleSheet.fromTheme(Theme.of(context)), |
| }; |
| |
| return result.copyWith( |
| textScaler: MediaQuery.textScalerOf(context), |
| ); |
| }; |
| |
| Widget _handleDataSchemeUri( |
| Uri uri, final double? width, final double? height) { |
| final String mimeType = uri.data!.mimeType; |
| if (mimeType.startsWith('image/')) { |
| return Image.memory( |
| uri.data!.contentAsBytes(), |
| width: width, |
| height: height, |
| ); |
| } else if (mimeType.startsWith('text/')) { |
| return Text(uri.data!.contentAsString()); |
| } |
| return const SizedBox(); |
| } |
| |
| @JS('window.navigator.userAgent') |
| external JSString get _userAgent; |