transferencia nos professores

lib/features/materials/presentation/pages/teacher_materials_page.dart

@@ -860,6 +860,33 @@ class _TeacherMaterialsPageState extends State<TeacherMaterialsPage> {
     }
   }
 
+  Future<void> _downloadFile(String? url, String fileName) async {
+    if (url == null || url.isEmpty) {
+      _showErrorSnackBar('URL do ficheiro não disponível');
+      return;
+    }
+
+    try {
+      print('Downloading file: $fileName');
+      print('URL: $url');
+      final uri = Uri.parse(url);
+
+      final launched = await launchUrl(
+        uri,
+        mode: LaunchMode.externalApplication,
+      );
+
+      if (launched) {
+        _showSuccessSnackBar('A transferir $fileName...');
+      } else {
+        _showErrorSnackBar('Não foi possível iniciar a transferência');
+      }
+    } catch (e) {
+      print('Error downloading file: $e');
+      _showErrorSnackBar('Erro ao transferir ficheiro: $e');
+    }
+  }
+
   Widget _buildMaterialCard({
     required String docId,
     required String fileName,
@@ -934,11 +961,19 @@ class _TeacherMaterialsPageState extends State<TeacherMaterialsPage> {
             IconButton(
               icon: const Icon(Icons.visibility_outlined, color: Colors.blue),
               tooltip: 'Ver',
+              constraints: const BoxConstraints(minWidth: 40, minHeight: 40),
               onPressed: () => _openFile(url, fileName),
             ),
+            IconButton(
+              icon: const Icon(Icons.download_outlined, color: Colors.green),
+              tooltip: 'Transferir',
+              constraints: const BoxConstraints(minWidth: 40, minHeight: 40),
+              onPressed: () => _downloadFile(url, fileName),
+            ),
             IconButton(
               icon: const Icon(Icons.delete_outline, color: Colors.red),
               tooltip: 'Eliminar',
+              constraints: const BoxConstraints(minWidth: 40, minHeight: 40),
               onPressed: () => _showDeleteConfirmation(
                 docId: docId,
                 fileName: fileName,