68 lines
1.9 KiB
Dart
68 lines
1.9 KiB
Dart
// 图片选择 + 压缩 + 缩略图生成工具类
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//
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// 职责：
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// - 从相机/相册选择图片
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// - 压缩到合理尺寸（≤1024px, 质量 85）
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// - 生成缩略图（≤200px, 质量 70）
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import 'package:flutter_image_compress/flutter_image_compress.dart';
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import 'package:image_picker/image_picker.dart';
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import 'package:path_provider/path_provider.dart';
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import 'package:uuid/uuid.dart';
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/// 图片选择 + 压缩 + 缩略图生成
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class ImagePickerHandler {
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static const _uuid = Uuid();
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/// 从相机或相册选择图片
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/// 返回压缩后的本地文件路径，取消返回 null
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static Future<String?> pickImage({required bool fromCamera}) async {
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final picker = ImagePicker();
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final xFile = await picker.pickImage(
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source: fromCamera ? ImageSource.camera : ImageSource.gallery,
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maxWidth: 1024,
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maxHeight: 1024,
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imageQuality: 85,
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);
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if (xFile == null) return null;
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// 压缩图片
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final compressedPath = await _compressImage(xFile.path);
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return compressedPath;
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}
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/// 生成缩略图路径
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static Future<String> generateThumbnail(String imagePath) async {
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final dir = await getApplicationDocumentsDirectory();
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final thumbName = 'thumb_${_uuid.v4()}.jpg';
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final thumbPath = '${dir.path}/$thumbName';
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final result = await FlutterImageCompress.compressAndGetFile(
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imagePath,
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thumbPath,
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minHeight: 200,
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minWidth: 200,
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quality: 70,
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);
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return result?.path ?? imagePath;
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}
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/// 压缩原图
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static Future<String> _compressImage(String path) async {
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final dir = await getApplicationDocumentsDirectory();
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final fileName = 'img_${_uuid.v4()}.jpg';
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final targetPath = '${dir.path}/$fileName';
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final result = await FlutterImageCompress.compressAndGetFile(
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path,
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targetPath,
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quality: 85,
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minWidth: 1024,
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minHeight: 1024,
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);
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return result?.path ?? path;
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}
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}
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