From 4cd13e84b25ac6ae693bb9f2a1dbbbb4e6cda828 Mon Sep 17 00:00:00 2001
From: NaBian <836904362@qq.com>
Date: Tue, 11 Sep 2018 15:17:51 +0800
Subject: [PATCH] Fixed a bug of tabcontrol

---
 HandyControl/Controls/TabControl/TabControl.cs | 7 ++++---
 HandyControl/Controls/TabControl/TabPanel.cs   | 8 +++++---
 HandyControl/Themes/Styles/TabControl.xaml     | 2 +-
 3 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/HandyControl/Controls/TabControl/TabControl.cs b/HandyControl/Controls/TabControl/TabControl.cs
index 38e24b2f..99e79d94 100644
--- a/HandyControl/Controls/TabControl/TabControl.cs
+++ b/HandyControl/Controls/TabControl/TabControl.cs
@@ -133,7 +133,7 @@ namespace HandyControl.Controls
             if (!IsEnableTabFill)
             {
                 _itemShowCount = (int)(ActualWidth / TabItemWidth);
-                _buttonOverflow.Show(Items.Count >= _itemShowCount);
+                _buttonOverflow.Show(Items.Count > 0  && Items.Count >= _itemShowCount);
             }
 
             if (IsInternalAction)
@@ -151,9 +151,10 @@ namespace HandyControl.Controls
             }
             if (e.Action == NotifyCollectionChangedAction.Add)
             {
-                foreach (UIElement item in e.NewItems)
+                foreach (TabItem item in e.NewItems)
                 {
                     item.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
+                    item.IsSelected = true;
                 }
             }
             IsInternalAction = false;
@@ -170,7 +171,7 @@ namespace HandyControl.Controls
             if (_buttonOverflow != null)
             {
                 _itemShowCount = (int)(ActualWidth / TabItemWidth);
-                _buttonOverflow.Show(Items.Count >= _itemShowCount);
+                _buttonOverflow.Show(Items.Count > 0 && Items.Count >= _itemShowCount);
 
                 var menu = new ContextMenu
                 {
diff --git a/HandyControl/Controls/TabControl/TabPanel.cs b/HandyControl/Controls/TabControl/TabPanel.cs
index 7c7de2a7..39fd164b 100644
--- a/HandyControl/Controls/TabControl/TabPanel.cs
+++ b/HandyControl/Controls/TabControl/TabPanel.cs
@@ -107,7 +107,7 @@ namespace HandyControl.Controls
             var count = InternalChildren.Count;
             if (count == 0)
             {
-                _oldSize.Width = 0;
+                _oldSize = new Size();
                 return _oldSize;
             }
             constraint.Width += InternalChildren.Count;
@@ -121,7 +121,10 @@ namespace HandyControl.Controls
             }
             else
             {
-                arr = ArithmeticHelper.DivideInt2Arr((int)constraint.Width, count);
+                if (TemplatedParent is TabControl tabControl)
+                {
+                    arr = ArithmeticHelper.DivideInt2Arr((int)tabControl.ActualWidth + InternalChildren.Count, count);
+                }
             }
 
             for (var index = 0; index < count; index++)
@@ -140,7 +143,6 @@ namespace HandyControl.Controls
                         Width = itemWidth,
                         Height = TabItemHeight
                     };
-                    Console.WriteLine(rect);
                     tabItem.Arrange(rect);
                     tabItem.ItemWidth = itemWidth - tabItem.BorderThickness.Left;
                     tabItem.CurrentIndex = index;
diff --git a/HandyControl/Themes/Styles/TabControl.xaml b/HandyControl/Themes/Styles/TabControl.xaml
index 925d6ae4..a6de7dd9 100644
--- a/HandyControl/Themes/Styles/TabControl.xaml
+++ b/HandyControl/Themes/Styles/TabControl.xaml
@@ -81,7 +81,7 @@
                                 <RowDefinition x:Name="RowDefinition1" Height="*"/>
                             </Grid.RowDefinitions>
                             <Border Background="White" BorderThickness="0,0,0,1" BorderBrush="{DynamicResource BorderBrush}">
-                                <controls:TabPanel TabItemHeight="{TemplateBinding TabItemHeight}" TabItemWidth="{TemplateBinding TabItemWidth}" IsEnableTabFill="{TemplateBinding IsEnableTabFill}" Margin="0,0,-1,-1" x:Name="PART_HeaderPanel" HorizontalAlignment="Left" Background="{DynamicResource SecondaryTextBrush}" IsItemsHost="true" KeyboardNavigation.TabIndex="1" Panel.ZIndex="1">
+                                <controls:TabPanel MinHeight="{TemplateBinding TabItemHeight}" TabItemHeight="{TemplateBinding TabItemHeight}" TabItemWidth="{TemplateBinding TabItemWidth}" IsEnableTabFill="{TemplateBinding IsEnableTabFill}" Margin="0,0,-1,-1" x:Name="PART_HeaderPanel" HorizontalAlignment="Left" Background="{DynamicResource SecondaryTextBrush}" IsItemsHost="true" KeyboardNavigation.TabIndex="1" Panel.ZIndex="1">
                                     <interactivity:Interaction.Behaviors>
                                         <interactivity:FluidMoveBehavior AppliesTo="Children" Duration="{Binding FluidMoveDuration,ElementName=PART_HeaderPanel}">
                                             <interactivity:FluidMoveBehavior.EaseX>