From 4b2abfc7082764325c9fcee407ef7a202cba84a8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=BC=98=E9=9F=AC=20=E5=BC=A0?= <hongtao_zhang@outlook.com>
Date: Fri, 13 Nov 2020 13:41:59 +0800
Subject: [PATCH] Reduce batch time to speed up view update change selected
 index update place to fix not first selection issue

---
 Flow.Launcher/ViewModel/MainViewModel.cs    | 2 +-
 Flow.Launcher/ViewModel/ResultsViewModel.cs | 7 ++++++-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/Flow.Launcher/ViewModel/MainViewModel.cs b/Flow.Launcher/ViewModel/MainViewModel.cs
index cd2913570..48e621126 100644
--- a/Flow.Launcher/ViewModel/MainViewModel.cs
+++ b/Flow.Launcher/ViewModel/MainViewModel.cs
@@ -111,7 +111,7 @@ namespace Flow.Launcher.ViewModel
                 while (true)
                 {
                     List<ResultsForUpdate> queue = new List<ResultsForUpdate>() { _resultsUpdateQueue.Take() };
-                    await Task.Delay(50);
+                    await Task.Delay(30);
 
                     while (_resultsUpdateQueue.TryTake(out var resultsForUpdate))
                     {
diff --git a/Flow.Launcher/ViewModel/ResultsViewModel.cs b/Flow.Launcher/ViewModel/ResultsViewModel.cs
index 038cfb4e3..3e464afe1 100644
--- a/Flow.Launcher/ViewModel/ResultsViewModel.cs
+++ b/Flow.Launcher/ViewModel/ResultsViewModel.cs
@@ -158,6 +158,11 @@ namespace Flow.Launcher.ViewModel
         public void AddResults(IEnumerable<ResultsForUpdate> resultsForUpdates)
         {
             var newResults = NewResults(resultsForUpdates);
+
+            // https://social.msdn.microsoft.com/Forums/vstudio/en-US/5ff71969-f183-4744-909d-50f7cd414954/binding-a-tabcontrols-selectedindex-not-working?forum=wpf
+            // fix selected index flow
+            SelectedIndex = 0;
+
             lock (_collectionLock)
             {
                 Results.Update(newResults);
@@ -167,7 +172,6 @@ namespace Flow.Launcher.ViewModel
             {
                 case Visibility.Collapsed when Results.Count > 0:
                     Margin = new Thickness { Top = 8 };
-                    SelectedIndex = 0;
                     Visbility = Visibility.Visible;
                     break;
                 case Visibility.Visible when Results.Count == 0:
@@ -175,6 +179,7 @@ namespace Flow.Launcher.ViewModel
                     Visbility = Visibility.Collapsed;
                     break;
             }
+
         }