feat: handle drop files from web

packages/desktop_drop/example/pubspec.lock

@@ -208,10 +208,10 @@ packages:
     dependency: transitive
     description:
       name: web
-      sha256: "14f1f70c51119012600c5f1f60ca68efda5a9b6077748163c6af2893ec5df8fc"
+      sha256: afe077240a270dcfd2aafe77602b4113645af95d0ad31128cc02bce5ac5d5152
       url: "https://pub.dev"
     source: hosted
-    version: "0.2.1-beta"
+    version: "0.3.0"
 sdks:
-  dart: ">=3.2.0-157.0.dev <4.0.0"
+  dart: ">=3.2.0-194.0.dev <4.0.0"
   flutter: ">=1.20.0"

packages/desktop_drop/lib/desktop_drop_web.dart

@@ -1,10 +1,12 @@
 import 'dart:async';
+import 'dart:convert';
 import 'dart:html' as html;
 import 'dart:js_util' as js_util;
 
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_web_plugins/flutter_web_plugins.dart';
+import 'package:mime/mime.dart';
 
 import 'src/web_drop_item.dart';
 
@@ -47,7 +49,8 @@ class DesktopDropWeb {
       final children = await Future.wait(
         entries.map((e) => _entryToWebDropItem(e)),
       )
-        ..removeWhere((element) => element.name == '.DS_Store' && element.type == '');
+        ..removeWhere(
+            (element) => element.name == '.DS_Store' && element.type == '');
       return WebDropItem(
         uri: html.Url.createObjectUrlFromBlob(html.Blob([], 'directory')),
         name: entry.name ?? '',
@@ -80,19 +83,44 @@ class DesktopDropWeb {
     );
   }
 
+  String _getMimeType(String text) {
+    final pattern = RegExp(r'^data:([^;]+);');
+    return pattern.firstMatch(text)?.group(1) ?? 'text/plain';
+  }
+
   void _registerEvents() {
     html.window.onDrop.listen((event) {
       event.preventDefault();
 
       final items = event.dataTransfer.items;
       Future.wait(List.generate(items?.length ?? 0, (index) {
         final item = items![index];
-        final entry = item.getAsEntry();
-        return _entryToWebDropItem(entry);
+        if (item.kind == 'file') {
+          final entry = item.getAsEntry();
+          return _entryToWebDropItem(entry);
+        }
+        if (item.kind == 'string' && item.type == 'text/uri-list') {
+          final data = event.dataTransfer.getData(item.type!);
+          final mime = _getMimeType(data);
+          return Future.value(
+            WebDropItem(
+              uri: data,
+              name: 'file.${extensionFromMime(mime)}',
+              type: mime,
+              data: base64Decode(data.split(';base64,')[1]),
+              size: 0,
+              relativePath: '',
+              lastModified: DateTime.now(),
+              children: [],
+            ),
+          );
+        }
+        // other types such as text/html
+        return Future.value(null);
       })).then((webItems) {
         channel.invokeMethod(
           "performOperation_web",
-          webItems.map((e) => e.toJson()).toList(),
+          webItems.whereType<WebDropItem>().map((e) => e.toJson()).toList(),
         );
       }).catchError((e, s) {
         debugPrint('desktop_drop_web: $e $s');

packages/desktop_drop/lib/src/web_drop_item.dart

@@ -31,7 +31,9 @@ class WebDropItem {
                 .cast<Map>()
                 .map((e) => WebDropItem.fromJson(e.cast<String, dynamic>()))
                 .toList(),
-        data: json['data'] != null ? Uint8List.fromList(json['data']) : null,
+        data: json['data'] != null
+            ? Uint8List.fromList((json['data'] as List).cast<int>())
+            : null,
         name: json['name'],
         type: json['type'],
         size: json['size'],

packages/desktop_drop/pubspec.yaml

@@ -13,6 +13,7 @@ dependencies:
   flutter_web_plugins:
     sdk: flutter
   cross_file: ^0.3.3+4
+  mime: ^1.0.5
 
 dev_dependencies:
   flutter_test:
@@ -33,4 +34,4 @@ flutter:
         pluginClass: DesktopDropPlugin
       web:
         pluginClass: DesktopDropWeb
-        fileName: desktop_drop_web.dart
+        fileName: desktop_drop_web.dart