new: sftp search (#345)

lib/view/page/storage/sftp.dart

@@ -17,6 +17,7 @@ import 'package:toolbox/data/res/provider.dart';
 import 'package:toolbox/data/res/store.dart';
 import 'package:toolbox/view/widget/omit_start_text.dart';
 import 'package:toolbox/view/widget/cardx.dart';
+import 'package:toolbox/view/widget/search.dart';
 import 'package:toolbox/view/widget/val_builder.dart';
 
 import '../../../core/extension/numx.dart';
@@ -129,8 +130,10 @@ class _SftpPageState extends State<SftpPage> with AfterLayoutMixin {
     final children = widget.isSelect
         ? [
             IconButton(
-                onPressed: () => context.pop(_status.path?.path),
+              onPressed: () => context.pop(_status.path?.path),
-                icon: const Icon(Icons.done))
+              icon: const Icon(Icons.done),
+            ),
+            _buildSearchBtn(),
           ]
         : [
             IconButton(
@@ -143,6 +146,7 @@ class _SftpPageState extends State<SftpPage> with AfterLayoutMixin {
             _buildAddBtn(),
             _buildGotoBtn(),
             _buildUploadBtn(),
+            _buildSearchBtn(),
           ];
     if (isDesktop) children.add(_buildRefreshBtn());
     return SafeArea(
@@ -162,6 +166,28 @@ class _SftpPageState extends State<SftpPage> with AfterLayoutMixin {
     );
   }
 
+  Widget _buildSearchBtn() {
+    return IconButton(
+      onPressed: () async {
+        Stream<SftpName> find(String query) async* {
+          final fs = _status.files;
+          if (fs == null) return;
+          for (final f in fs) {
+            if (f.filename.contains(query)) yield f;
+          }
+        }
+
+        final search = SearchPage(
+          padding: const EdgeInsets.symmetric(horizontal: 7, vertical: 3),
+          future: (q) => find(q).toList(),
+          builder: (ctx, e) => _buildItem(e, beforeTap: () => ctx.pop()),
+        );
+        await showSearch(context: context, delegate: search);
+      },
+      icon: const Icon(Icons.search),
+    );
+  }
+
   Widget _buildUploadBtn() {
     return IconButton(
         onPressed: () async {
@@ -314,7 +340,7 @@ class _SftpPageState extends State<SftpPage> with AfterLayoutMixin {
     );
   }
 
-  Widget _buildItem(SftpName file) {
+  Widget _buildItem(SftpName file, {VoidCallback? beforeTap}) {
     final isDir = file.attr.isDirectory;
     final trailing = Text(
       '${_getTime(file.attr.modifyTime)}\n${file.attr.mode?.str ?? ''}',
@@ -333,6 +359,7 @@ class _SftpPageState extends State<SftpPage> with AfterLayoutMixin {
                 style: UIs.textGrey,
               ),
         onTap: () {
+          beforeTap?.call();
           if (isDir) {
             _status.path?.update(file.filename);
             _listDir();
@@ -340,7 +367,10 @@ class _SftpPageState extends State<SftpPage> with AfterLayoutMixin {
             _onItemPress(file, true);
           }
         },
-        onLongPress: () => _onItemPress(file, !isDir),
+        onLongPress: () {
+          beforeTap?.call();
+          _onItemPress(file, !isDir);
+        },
       ),
     );
   }

lib/view/widget/search.dart

@@ -0,0 +1,87 @@
+import 'package:flutter/material.dart';
+import 'package:toolbox/core/extension/context/common.dart';
+import 'package:toolbox/core/extension/context/locale.dart';
+import 'package:toolbox/data/res/ui.dart';
+import 'package:toolbox/view/widget/future_widget.dart';
+
+final class SearchPage<T> extends SearchDelegate<T> {
+  final Future<List<T>> Function(String) future;
+  final Widget Function(BuildContext, T) builder;
+  final EdgeInsetsGeometry? padding;
+  final Duration throttleInterval;
+
+  List<T> _cache = [];
+  DateTime? _lastSearch;
+
+  SearchPage({
+    required this.future,
+    required this.builder,
+    this.padding,
+    this.throttleInterval = const Duration(milliseconds: 200),
+  });
+
+  @override
+  List<Widget>? buildActions(BuildContext context) {
+    return [
+      IconButton(
+        icon: const Icon(Icons.clear),
+        onPressed: () {
+          query = '';
+        },
+      ),
+    ];
+  }
+
+  @override
+  Widget? buildLeading(BuildContext context) {
+    return IconButton(
+      onPressed: context.pop,
+      icon: const Icon(Icons.arrow_back),
+    );
+  }
+
+  @override
+  Widget buildResults(BuildContext context) {
+    return _buildList(context);
+  }
+
+  @override
+  Widget buildSuggestions(BuildContext context) {
+    return _buildList(context);
+  }
+
+  Widget _buildList(BuildContext context) {
+    return FutureWidget(
+      future: _search(query),
+      loading: const Center(child: UIs.centerSizedLoading),
+      error: (error, trace) {
+        return Center(
+          child: Text('$error\n$trace'),
+        );
+      },
+      success: (list) {
+        if (list == null || list.isEmpty) {
+          return Center(child: Text(l10n.noResult));
+        }
+
+        return ListView.builder(
+          padding: padding,
+          itemCount: list.length,
+          itemBuilder: (_, index) => builder(context, list[index]),
+        );
+      },
+    );
+  }
+
+  Future<List<T>> _search(String query) async {
+    final lastSearch = _lastSearch;
+    if (lastSearch != null) {
+      final now = DateTime.now();
+      if (now.difference(lastSearch) < throttleInterval) {
+        return _cache;
+      }
+    }
+    _cache = await future(query);
+    return _cache;
+  }
+}