enhance: improve commit time textblock performance

Signed-off-by: leo <longshuang@msn.cn>

Author: love-linger

src/Views/CommitTimeTextBlock.cs

@@ -43,13 +43,10 @@ protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs chang
         {
             base.OnPropertyChanged(change);
 
-            if (change.Property == UseAuthorTimeProperty)
+            if (change.Property == ShowAsDateTimeProperty)
             {
-                SetCurrentValue(TextProperty, GetDisplayText());
-            }
-            else if (change.Property == ShowAsDateTimeProperty)
-            {
-                SetCurrentValue(TextProperty, GetDisplayText());
+                _displayTimestamp = 0;
+                UpdateDisplayText();
 
                 if (ShowAsDateTime)
                 {
@@ -62,10 +59,17 @@ protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs chang
                     HorizontalAlignment = HorizontalAlignment.Center;
                 }
             }
+            else if (change.Property == UseAuthorTimeProperty)
+            {
+                UpdateDisplayText();
+            }
             else if (change.Property == DateTimeFormatProperty)
             {
                 if (ShowAsDateTime)
-                    SetCurrentValue(TextProperty, GetDisplayText());
+                {
+                    _displayTimestamp = 0;
+                    UpdateDisplayText();
+                }
             }
         }
 
@@ -86,7 +90,7 @@ protected override void OnUnloaded(RoutedEventArgs e)
         protected override void OnDataContextChanged(EventArgs e)
         {
             base.OnDataContextChanged(e);
-            SetCurrentValue(TextProperty, GetDisplayText());
+            UpdateDisplayText();
         }
 
         private void StartTimer()
@@ -96,13 +100,7 @@ private void StartTimer()
 
             _refreshTimer = DispatcherTimer.Run(() =>
             {
-                Dispatcher.UIThread.Invoke(() =>
-                {
-                    var text = GetDisplayText();
-                    if (!text.Equals(Text, StringComparison.Ordinal))
-                        Text = text;
-                });
-
+                Dispatcher.UIThread.Invoke(UpdateDisplayText);
                 return true;
             }, TimeSpan.FromSeconds(10));
         }
@@ -116,15 +114,25 @@ private void StopTimer()
             }
         }
 
-        private string GetDisplayText()
+        private void UpdateDisplayText()
         {
             if (DataContext is not Models.Commit commit)
-                return string.Empty;
+                return;
+
+            var timestamp = UseAuthorTime ? commit.AuthorTime : commit.CommitterTime;
+            if (timestamp == _displayTimestamp)
+                return;
+
+            _displayTimestamp = timestamp;
 
             if (ShowAsDateTime)
-                return UseAuthorTime ? commit.AuthorTimeStr : commit.CommitterTimeStr;
+                Text = DateTime.UnixEpoch.AddSeconds(timestamp).ToLocalTime().ToString(Models.DateTimeFormat.Active.DateTime);
+            else
+                Text = FormatTimePeriod(timestamp);
+        }
 
-            var timestamp = UseAuthorTime ? commit.AuthorTime : commit.CommitterTime;
+        private string FormatTimePeriod(ulong timestamp)
+        {
             var now = DateTime.Now;
             var localTime = DateTime.UnixEpoch.AddSeconds(timestamp).ToLocalTime();
             var span = now - localTime;
@@ -168,5 +176,6 @@ private string GetDisplayText()
         }
 
         private IDisposable _refreshTimer = null;
+        private ulong _displayTimestamp = 0;
     }
 }