Add new settings dlUseAvgSpeed

lib/dialog/task_page.dart

@@ -137,8 +137,14 @@ class _TaskPage extends State<TaskPage> {
         return Text(i18n.fetchingMetadata);
       }
       double speed = 0;
-      for (final e in p.details) {
+      final dlUseAvgSpeed = prefs.getBool("dlUseAvgSpeed") ?? false;
-        speed += e.speed;
+      if (dlUseAvgSpeed) {
+        final now = DateTime.now().millisecondsSinceEpoch;
+        if (now > p.started) speed = p.downloadedBytes / (now - p.started);
+      } else {
+        for (final e in p.details) {
+          speed += e.speed;
+        }
       }
       if (p.failedPage == 0) {
         final percent = p.downloadedPage / p.totalPage;
@@ -221,6 +227,7 @@ class _TaskPage extends State<TaskPage> {
     final p = task.progress as TaskDownloadProgess;
     if (p.details.isEmpty) return SliverToBoxAdapter(child: Container());
     final i18n = AppLocalizations.of(context)!;
+    final dlUseAvgSpeed = prefs.getBool("dlUseAvgSpeed") ?? false;
     return SliverList.builder(
       itemCount: p.details.length,
       itemBuilder: (context, index) {
@@ -235,6 +242,11 @@ class _TaskPage extends State<TaskPage> {
         final eta = d.total == 0
             ? double.infinity
             : (d.total - d.downloaded) / avgSpeed;
+        final speed = dlUseAvgSpeed
+            ? d.total == 0
+                ? 0.0
+                : avgSpeed
+            : d.speed;
         return Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
           SelectableText("${d.name}(${d.width}x${d.height})"),
           LinearPercentIndicator(
@@ -254,7 +266,7 @@ class _TaskPage extends State<TaskPage> {
                 child: Text(
                     "${getFileSize(d.downloaded)}/${getFileSize(d.total)}")),
             Text(
-                "${getFileSize((d.speed * 1000).toInt())}/s${i18n.comma}${fmtDuration(context, eta)}"),
+                "${getFileSize((speed * 1000).toInt())}/s${i18n.comma}${fmtDuration(context, eta)}"),
           ]),
         ]);
       },

lib/l10n/app_en.arb

@@ -191,5 +191,6 @@
         }
     },
     "category": "Category",
-    "uploader": "Uploader"
+    "uploader": "Uploader",
+    "dlUseAvgSpeed": "Show average speed in task details."
 }

lib/l10n/app_zh.arb

@@ -191,5 +191,6 @@
         }
     },
     "category": "分类",
-    "uploader": "上传者"
+    "uploader": "上传者",
+    "dlUseAvgSpeed": "在任务详情中显示平均速度。"
 }

lib/settings.dart

@@ -24,12 +24,14 @@ class _SettingsPage extends State<SettingsPage> with ThemeModeWidget {
   bool _oriShowNsfw = false;
   bool _oriShowTranslatedTag = false;
   bool _oriUseTitleJpn = false;
+  bool _oriDlUseAvgSpeed = false;
   bool _displayAd = false;
   Lang _lang = Lang.system;
   bool _preventScreenCapture = false;
   bool _showNsfw = false;
   bool _showTranslatedTag = false;
   bool _useTitleJpn = false;
+  bool _dlUseAvgSpeed = false;
   @override
   void initState() {
     super.initState();
@@ -82,6 +84,14 @@ class _SettingsPage extends State<SettingsPage> with ThemeModeWidget {
       _oriPreventScreenCapture = false;
       _preventScreenCapture = false;
     }
+    try {
+      _oriDlUseAvgSpeed = prefs.getBool("dlUseAvgSpeed") ?? false;
+      _dlUseAvgSpeed = _oriDlUseAvgSpeed;
+    } catch (e) {
+      _log.warning("Failed to get dlUseAvgSpeed:", e);
+      _oriDlUseAvgSpeed = false;
+      _dlUseAvgSpeed = false;
+    }
   }
 
   void fallback(BuildContext context) {
@@ -99,6 +109,7 @@ class _SettingsPage extends State<SettingsPage> with ThemeModeWidget {
       _displayAd = false;
       _showTranslatedTag = _oriLang.toLocale().languageCode == "zh";
       _preventScreenCapture = false;
+      _dlUseAvgSpeed = false;
     });
   }
 
@@ -159,6 +170,14 @@ class _SettingsPage extends State<SettingsPage> with ThemeModeWidget {
         }
       }
     }
+    if (_dlUseAvgSpeed != _oriDlUseAvgSpeed) {
+      if (!await prefs.setBool("dlUseAvgSpeed", _dlUseAvgSpeed)) {
+        re = false;
+        _log.warning("Failed to save dlUseAvgSpeed.");
+      } else {
+        _oriDlUseAvgSpeed = _dlUseAvgSpeed;
+      }
+    }
     return re;
   }
 
@@ -297,6 +316,21 @@ class _SettingsPage extends State<SettingsPage> with ThemeModeWidget {
                                     ),
                                   )
                                 : Container(),
+                            Container(
+                              padding: const EdgeInsets.symmetric(vertical: 8),
+                              child: CheckboxMenuButton(
+                                value: _dlUseAvgSpeed,
+                                onChanged: (bool? value) {
+                                  if (value != null) {
+                                    setState(() {
+                                      _dlUseAvgSpeed = value;
+                                    });
+                                  }
+                                },
+                                child: Text(AppLocalizations.of(context)!
+                                    .dlUseAvgSpeed),
+                              ),
+                            ),
                             Row(
                               mainAxisAlignment: MainAxisAlignment.center,
                               children: [