fixed #352

src/Shared/HandyControl_Shared/Controls/TabControl/TabControl.cs

@@ -232,15 +232,6 @@ namespace HandyControl.Controls
                 return;
             }
 
-            if (IsAnimationEnabled)
-            {
-                HeaderPanel.SetCurrentValue(TabPanel.FluidMoveDurationProperty, new Duration(TimeSpan.FromMilliseconds(200)));
-            }
-            else
-            {
-                HeaderPanel.FluidMoveDuration = new Duration(TimeSpan.FromSeconds(0));
-            }
-
             if (e.Action == NotifyCollectionChangedAction.Add)
             {
                 for (var i = 0; i < Items.Count; i++)
@@ -252,7 +243,6 @@ namespace HandyControl.Controls
             }
 
             _headerBorder?.InvalidateMeasure();
-
             IsInternalAction = false;
         }
 
@@ -361,11 +351,11 @@ namespace HandyControl.Controls
                             list.Insert(0, actualItem);
                             if (IsAnimationEnabled)
                             {
-                                HeaderPanel.SetCurrentValue(TabPanel.FluidMoveDurationProperty, new Duration(TimeSpan.FromMilliseconds(200)));
+                                HeaderPanel.SetValue(TabPanel.FluidMoveDurationPropertyKey, new Duration(TimeSpan.FromMilliseconds(200)));
                             }
                             else
                             {
-                                HeaderPanel.FluidMoveDuration = new Duration(TimeSpan.FromSeconds(0));
+                                HeaderPanel.SetValue(TabPanel.FluidMoveDurationPropertyKey, new Duration(TimeSpan.FromMilliseconds(0)));
                             }
                             HeaderPanel.ForceUpdate = true;
                             HeaderPanel.Measure(new Size(HeaderPanel.DesiredSize.Width, ActualHeight));

src/Shared/HandyControl_Shared/Controls/TabControl/TabItem.cs

@@ -280,7 +280,7 @@ namespace HandyControl.Controls
             RaiseEvent(argsClosing);
             if (argsClosing.Cancel) return;
 
-            TabPanel.SetCurrentValue(TabPanel.FluidMoveDurationProperty, parent.IsAnimationEnabled
+            TabPanel.SetValue(TabPanel.FluidMoveDurationPropertyKey, parent.IsAnimationEnabled
                     ? new Duration(TimeSpan.FromMilliseconds(200))
                     : new Duration(TimeSpan.FromMilliseconds(1)));
             
@@ -302,7 +302,7 @@ namespace HandyControl.Controls
             if (parent.IsDraggable && !ItemIsDragging && !_isDragging)
             {
                 parent.UpdateScroll();
-                TabPanel.FluidMoveDuration = new Duration(TimeSpan.FromSeconds(0));
+                TabPanel.SetValue(TabPanel.FluidMoveDurationPropertyKey, new Duration(TimeSpan.FromSeconds(0)));
                 _mouseDownOffsetX = RenderTransform.Value.OffsetX;
                 _scrollHorizontalOffset = parent.GetHorizontalOffset();
                 var mx = TranslatePoint(new Point(), parent).X + _scrollHorizontalOffset;
@@ -407,6 +407,7 @@ namespace HandyControl.Controls
                 list.Remove(item);
                 parent.IsInternalAction = true;
                 list.Insert(index, item);
+                _tabPanel.SetValue(TabPanel.FluidMoveDurationPropertyKey, new Duration(TimeSpan.FromMilliseconds(0)));
                 TabPanel.CanUpdate = true;
                 TabPanel.ForceUpdate = true;
                 TabPanel.Measure(new Size(TabPanel.DesiredSize.Width, ActualHeight));

src/Shared/HandyControl_Shared/Controls/TabControl/TabPanel.cs

@@ -22,11 +22,15 @@ namespace HandyControl.Controls
         /// </summary>
         internal Dictionary<int, TabItem> ItemDic = new Dictionary<int, TabItem>();
 
+        public static readonly DependencyPropertyKey FluidMoveDurationPropertyKey =
+            DependencyProperty.RegisterReadOnly("FluidMoveDuration", typeof(Duration), typeof(TabPanel),
+                new PropertyMetadata(new Duration(TimeSpan.FromMilliseconds(0))));
+
         /// <summary>
         ///     流式行为持续时间
         /// </summary>
-        public static readonly DependencyProperty FluidMoveDurationProperty = DependencyProperty.Register(
-            "FluidMoveDuration", typeof(Duration), typeof(TabPanel), new PropertyMetadata(new Duration(TimeSpan.FromMilliseconds(200))));
+        public static readonly DependencyProperty FluidMoveDurationProperty =
+            FluidMoveDurationPropertyKey.DependencyProperty;
 
         /// <summary>
         ///     流式行为持续时间
@@ -96,7 +100,7 @@ namespace HandyControl.Controls
 
         protected override Size MeasureOverride(Size constraint)
         {
-            if ((_itemCount == InternalChildren.Count || !CanUpdate) && !ForceUpdate) return _oldSize;
+            if ((_itemCount == InternalChildren.Count || !CanUpdate) && !ForceUpdate && !IsTabFillEnabled) return _oldSize;
             constraint.Height = TabItemHeight;
             _itemCount = InternalChildren.Count;