https://github.com/StarCitizenToolBox/app/issues/1 分流下载：增加一种快速恢复卡住的下载的方法。

lib/common/utils/base_utils.dart

@@ -106,7 +106,10 @@ Future showBaseDialog(BuildContext context,
     builder: (context) => ContentDialog(
       title: Text(title),
       content: content,
-      constraints: constraints ?? kDefaultContentDialogConstraints,
+      constraints: constraints ?? const BoxConstraints(
+        maxWidth: 512,
+        maxHeight: 756.0,
+      ),
       actions: actions,
     ),
   );

lib/ui/tools/downloader/downloader_dialog_ui.dart

@@ -36,13 +36,21 @@ class DownloaderDialogUI extends BaseUI<DownloaderDialogUIModel> {
               const SizedBox(width: 24),
             ],
           ),
+          if (model.isP4kDownload) ...[
+            const SizedBox(height: 24),
+            Text(
+              "提示：因网络波动，若下载进度长时间卡住或速度变慢，可尝试点击暂停下载，之后重新点击P4K分流下载。",
+              style:
+                  TextStyle(fontSize: 13, color: Colors.white.withOpacity(.7)),
+            ),
+          ],
         ],
       ),
       actions: [
         FilledButton(
             child: const Padding(
               padding: EdgeInsets.only(left: 8, right: 8, top: 2, bottom: 2),
-              child: Text("取消下载"),
+              child: Text("暂停下载"),
             ),
             onPressed: () => model.doCancel()),
       ],

lib/ui/tools/downloader/downloader_dialog_ui_model.dart

@@ -1,6 +1,7 @@
 import 'dart:io';
 
 import 'package:file_picker/file_picker.dart';
+import 'package:hive/hive.dart';
 import 'package:starcitizen_doctor/base/ui_model.dart';
 import 'package:starcitizen_doctor/common/rust/ffi.dart';
 
@@ -10,9 +11,12 @@ class DownloaderDialogUIModel extends BaseUIModel {
   final String downloadUrl;
   final bool showChangeSavePathDialog;
   final int threadCount;
+  final bool isP4kDownload;
 
   DownloaderDialogUIModel(this.fileName, this.savePath, this.downloadUrl,
-      {this.showChangeSavePathDialog = false, this.threadCount = 1});
+      {this.showChangeSavePathDialog = false,
+      this.threadCount = 1,
+      this.isP4kDownload = false});
 
   bool isInMerging = false;
 
@@ -52,8 +56,15 @@ class DownloaderDialogUIModel extends BaseUIModel {
       savePath = savePath.substring(0, savePath.length - fileName.length - 1);
     }
 
-    final downloaderSavePath = "$savePath//$fileName.downloading";
+    if (isP4kDownload) {
+      final box = await Hive.openBox("p4k_cache");
+      await box.put(
+        "last_save_dir",
+        {"save_path": savePath, "file_name": fileName},
+      );
+    }
 
+    final downloaderSavePath = "$savePath//$fileName.downloading";
     try {
       rustFii
           .startDownload(

lib/ui/tools/tools_ui_model.dart

@@ -4,6 +4,7 @@ import 'dart:io';
 import 'package:dio/dio.dart';
 import 'package:flutter/foundation.dart';
 import 'package:font_awesome_flutter/font_awesome_flutter.dart';
+import 'package:hive/hive.dart';
 import 'package:starcitizen_doctor/api/analytics.dart';
 import 'package:starcitizen_doctor/base/ui_model.dart';
 import 'package:starcitizen_doctor/common/conf/app_conf.dart';
@@ -354,6 +355,10 @@ class ToolsUIModel extends BaseUIModel {
   }
 
   Future<void> _downloadP4k() async {
+    String savePath = scInstalledPath;
+    String fileName = "Data.p4k";
+    bool isResumeDownload = false;
+    final box = await Hive.openBox("p4k_cache");
     var downloadUrl = AppConf.networkVersionData?.p4kDownloadUrl;
     if (downloadUrl == null || downloadUrl.isEmpty) {
       showToast(context!, "该功能维护中，请稍后再试！");
@@ -365,14 +370,36 @@ class ToolsUIModel extends BaseUIModel {
               maxWidth: MediaQuery.of(context!).size.width * .35));
       return;
     }
+    final lastSavePath = (box.get("last_save_dir", defaultValue: {}) as Map);
+    dPrint("lastSavePath === $lastSavePath");
+    if (lastSavePath.isNotEmpty) {
+      final s = lastSavePath["save_path"] ?? "";
+      final f = lastSavePath["file_name"] ?? "";
+      if ((await File("$s/$f.downloading").exists()) &&
+          (await File("$s/$f.downloading.bson").exists())) {
+        final ok = await showConfirmDialogs(context!, "是否恢复下载？",
+            const Text("检测到未完成的下载，点击确认即可恢复下载，点击取消将会删除之前的临时文件，并开始一个新的下载。"));
+        if (ok) {
+          savePath = s;
+          fileName = f;
+          isResumeDownload = true;
+        } else {
+          // del last cache and del file
+          await box.delete("last_save_dir");
+          await File("$s/$f.downloading").delete();
+          await File("$s/$f.downloading.bson").delete();
+        }
+      } else {
+        // del last cache
+        await box.delete("last_save_dir");
+      }
+    } else {
       await showToast(
           context!,
           "P4k 是星际公民的核心游戏文件，高达近 100GB，盒子提供的离线下载是为了帮助一些p4k文件下载超级慢的用户。"
           "\n\n接下来会弹窗询问您保存位置（可以选择星际公民文件夹也可以选择别处），下载完成后请确保 P4K 文件夹位于 LIVE 文件夹内，之后使用星际公民启动器校验更新即可。");
-
       AnalyticsApi.touch("p4k_download");
-    launchUrlString(
+    }
-        "https://citizenwiki.cn/SC%E6%B1%89%E5%8C%96%E7%9B%92%E5%AD%90#%E5%88%86%E6%B5%81%E4%B8%8B%E8%BD%BD%E6%95%99%E7%A8%8B");
     final r = await showDialog(
         context: context!,
         dismissWithEsc: false,
@@ -380,16 +407,24 @@ class ToolsUIModel extends BaseUIModel {
           return BaseUIContainer(
               uiCreate: () => DownloaderDialogUI(),
               modelCreate: () => DownloaderDialogUIModel(
-                  "Data.p4k", scInstalledPath, downloadUrl,
+                  fileName, savePath, downloadUrl,
-                  showChangeSavePathDialog: true, threadCount: 10));
+                  showChangeSavePathDialog: !isResumeDownload,
+                  threadCount: 10,
+                  isP4kDownload: true));
         });
+
     if (r != null) {
       if (r == "cancel") {
-        return showToast(context!, "下载已取消，下载进度已保留，如果您无需恢复下载，请手动删除下载临时文件。");
+        return showToast(context!, "下载进度已保留，您可以再次点击此功能恢复下载。");
       } else if (r is DioException) {
         showToast(context!, "下载失败：$r");
       } else {
-        showToast(context!, "下载完毕，文件已保存到：$r");
+        final ok = await showConfirmDialogs(
+            context!, "下载完毕！", Text("文件已保存到：$r\n\n是否查看P4K操作教程？"));
+        if (ok == true) {
+          launchUrlString(
+              "https://citizenwiki.cn/SC%E6%B1%89%E5%8C%96%E7%9B%92%E5%AD%90#%E5%88%86%E6%B5%81%E4%B8%8B%E8%BD%BD%E6%95%99%E7%A8%8B");
+        }
       }
     }
   }