generated from dellevin/template
相册功能优化
This commit is contained in:
DelLevin-Home
188
lib/utils/image_saver.dart
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188
lib/utils/image_saver.dart
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import 'dart:io';
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import 'package:flutter/material.dart';
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import 'package:flutter/services.dart';
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import 'package:path/path.dart' as p;
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import 'package:path_provider/path_provider.dart';
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import 'package:permission_handler/permission_handler.dart';
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/// 图片保存工具 —— 将图片复制/写入到 /sdcard/Pictures/mooknote/
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class ImageSaver {
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/// 请求存储权限，返回是否已获取
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static Future<bool> requestPermission() async {
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if (!Platform.isAndroid) return true;
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var status = await Permission.manageExternalStorage.status;
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if (status.isGranted) return true;
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status = await Permission.manageExternalStorage.request();
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if (status.isGranted) return true;
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status = await Permission.storage.status;
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if (status.isGranted) return true;
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status = await Permission.storage.request();
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return status.isGranted;
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}
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/// 获取保存目录
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static Future<Directory> _getSaveDir() async {
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if (Platform.isAndroid) {
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final dir = Directory('/sdcard/Pictures/mooknote');
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if (!await dir.exists()) {
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await dir.create(recursive: true);
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}
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return dir;
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}
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// 非 Android 平台使用临时目录
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return await getTemporaryDirectory();
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}
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/// 生成带时间戳的文件名，保留原扩展名
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static String _buildFileName(String? originalPath, {String defaultExt = 'png'}) {
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final ts = DateTime.now().toLocal();
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final stamp = '${ts.year}${_pad(ts.month)}${_pad(ts.day)}_${_pad(ts.hour)}${_pad(ts.minute)}${_pad(ts.second)}';
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String ext = defaultExt;
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if (originalPath != null && originalPath.isNotEmpty) {
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final parsed = p.extension(originalPath).toLowerCase().replaceAll('.', '');
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if (parsed.isNotEmpty) ext = parsed;
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}
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return 'mooknote_$stamp.$ext';
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}
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static String _pad(int n) => n.toString().padLeft(2, '0');
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/// 长按保存的统一入口：弹出底部确认框，点击「下载」后才执行保存
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static Future<void> showSaveFromFileSheet(
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String sourcePath, {
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required BuildContext context,
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}) async {
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final messenger = ScaffoldMessenger.maybeOf(context);
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final src = File(sourcePath);
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if (!await src.exists()) {
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_toast(messenger, '原文件不存在');
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return;
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}
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if (!context.mounted) return;
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_showSheet(
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context: context,
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onConfirm: () => saveFromFile(sourcePath, context: context),
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);
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}
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/// 长按保存（字节）的统一入口：弹出底部确认框，点击「下载」后才执行保存
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static Future<void> showSaveFromBytesSheet(
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Uint8List bytes, {
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String? originalPath,
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required BuildContext context,
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}) async {
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_showSheet(
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context: context,
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onConfirm: () => saveFromBytes(bytes, originalPath: originalPath, context: context),
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);
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}
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static void _showSheet({
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required BuildContext context,
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required Future<void> Function() onConfirm,
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}) {
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final colors = Theme.of(context).colorScheme;
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showModalBottomSheet(
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context: context,
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backgroundColor: colors.surface,
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shape: const RoundedRectangleBorder(
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borderRadius: BorderRadius.vertical(top: Radius.circular(16)),
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),
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builder: (sheetCtx) => SafeArea(
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child: Padding(
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padding: const EdgeInsets.fromLTRB(24, 8, 24, 8),
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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Container(
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width: 32, height: 4,
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margin: const EdgeInsets.only(bottom: 8),
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decoration: BoxDecoration(
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color: colors.onSurface.withValues(alpha: 0.2),
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borderRadius: BorderRadius.circular(2),
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),
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),
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InkWell(
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borderRadius: BorderRadius.circular(8),
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onTap: () {
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Navigator.pop(sheetCtx);
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onConfirm();
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},
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child: Padding(
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padding: const EdgeInsets.symmetric(vertical: 10),
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child: Row(
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children: [
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Icon(Icons.download_outlined, size: 20, color: colors.primary),
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const SizedBox(width: 12),
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const Text('下载图片'),
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],
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),
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),
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),
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InkWell(
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borderRadius: BorderRadius.circular(8),
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onTap: () => Navigator.pop(sheetCtx),
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child: Padding(
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padding: const EdgeInsets.symmetric(vertical: 10),
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child: Row(
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children: [
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Icon(Icons.close, size: 20, color: colors.onSurface.withValues(alpha: 0.6)),
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const SizedBox(width: 12),
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Text('取消', style: TextStyle(color: colors.onSurface.withValues(alpha: 0.6))),
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],
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),
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),
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),
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],
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),
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),
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),
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);
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}
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/// 保存本地文件路径的图片，返回是否成功
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static Future<bool> saveFromFile(
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String sourcePath, {
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BuildContext? context,
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}) async {
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final messenger = context != null ? ScaffoldMessenger.maybeOf(context) : null;
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final src = File(sourcePath);
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if (!await src.exists()) {
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_toast(messenger, '原文件不存在');
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return false;
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}
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return _saveBytes(await src.readAsBytes(), _buildFileName(sourcePath), messenger);
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}
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/// 保存内存中的图片字节
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static Future<bool> saveFromBytes(
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Uint8List bytes, {
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String? originalPath,
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BuildContext? context,
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}) async {
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final messenger = context != null ? ScaffoldMessenger.maybeOf(context) : null;
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return _saveBytes(bytes, _buildFileName(originalPath), messenger);
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}
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static Future<bool> _saveBytes(Uint8List bytes, String fileName, ScaffoldMessengerState? messenger) async {
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if (!await requestPermission()) {
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_toast(messenger, '存储权限被拒绝');
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return false;
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}
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try {
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final dir = await _getSaveDir();
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final target = File(p.join(dir.path, fileName));
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await target.writeAsBytes(bytes);
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_toast(messenger, '已保存到 ${dir.path}');
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return true;
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} catch (e) {
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_toast(messenger, '保存失败：$e');
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return false;
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}
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}
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static void _toast(ScaffoldMessengerState? messenger, String msg) {
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if (messenger == null) return;
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messenger.showSnackBar(SnackBar(content: Text(msg), duration: const Duration(seconds: 3)));
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}
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}
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