优化更新代码，添加界面功能并整合

WPFluent/Controls/Flyout/Flyout.xaml

@@ -0,0 +1,75 @@
+<!--
+    This Source Code Form is subject to the terms of the MIT License.
+    If a copy of the MIT was not distributed with this file, You can obtain one at https://opensource.org/licenses/MIT.
+    Copyright (C) Leszek Pomianowski and WPF UI Contributors.
+    All Rights Reserved.
+    
+    Based on Microsoft XAML for Win UI
+    Copyright (c) Microsoft Corporation. All Rights Reserved.
+-->
+
+<ResourceDictionary
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:controls="clr-namespace:WPFluent.Controls">
+
+    <Style x:Key="DefaultFlyoutStyle" TargetType="{x:Type controls:Flyout}">
+        <Setter Property="Background" Value="{DynamicResource FlyoutBackground}" />
+        <Setter Property="BorderBrush" Value="{DynamicResource FlyoutBorderBrush}" />
+        <Setter Property="Margin" Value="0" />
+        <Setter Property="MinWidth" Value="20" />
+        <Setter Property="MinHeight" Value="20" />
+        <Setter Property="Padding" Value="12" />
+        <Setter Property="VerticalAlignment" Value="Bottom" />
+        <Setter Property="HorizontalAlignment" Value="Left" />
+        <Setter Property="VerticalContentAlignment" Value="Stretch" />
+        <Setter Property="HorizontalContentAlignment" Value="Stretch" />
+        <Setter Property="Placement" Value="Top" />
+        <Setter Property="Popup.AllowsTransparency" Value="True" />
+        <Setter Property="Popup.StaysOpen" Value="False" />
+        <Setter Property="Popup.PopupAnimation" Value="Fade" />
+        <Setter Property="Popup.VerticalOffset" Value="1" />
+        <Setter Property="Focusable" Value="False" />
+        <Setter Property="KeyboardNavigation.IsTabStop" Value="False" />
+        <Setter Property="SnapsToDevicePixels" Value="True" />
+        <Setter Property="OverridesDefaultStyle" Value="True" />
+        <Setter Property="Template">
+            <Setter.Value>
+                <ControlTemplate TargetType="{x:Type controls:Flyout}">
+                    <Grid>
+                        <Popup
+                            x:Name="PART_Popup"
+                            MinWidth="{TemplateBinding MinWidth}"
+                            MinHeight="{TemplateBinding MinHeight}"
+                            HorizontalAlignment="{TemplateBinding HorizontalAlignment}"
+                            VerticalAlignment="{TemplateBinding VerticalAlignment}"
+                            AllowsTransparency="{TemplateBinding Popup.AllowsTransparency}"
+                            Focusable="False"
+                            IsOpen="{TemplateBinding IsOpen}"
+                            Placement="{TemplateBinding Placement}"
+                            PopupAnimation="{TemplateBinding Popup.PopupAnimation}"
+                            StaysOpen="{TemplateBinding Popup.StaysOpen}"
+                            VerticalOffset="1">
+                            <Border
+                                x:Name="PopupBorder"
+                                Margin="{TemplateBinding Margin}"
+                                Padding="{TemplateBinding Padding}"
+                                HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
+                                VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
+                                Background="{TemplateBinding Background}"
+                                BorderBrush="{TemplateBinding BorderBrush}"
+                                BorderThickness="1"
+                                CornerRadius="{DynamicResource PopupCornerRadius}"
+                                SnapsToDevicePixels="True">
+                                <ContentPresenter Content="{TemplateBinding Content}" />
+                            </Border>
+                        </Popup>
+                    </Grid>
+                </ControlTemplate>
+            </Setter.Value>
+        </Setter>
+    </Style>
+
+    <Style BasedOn="{StaticResource DefaultFlyoutStyle}" TargetType="{x:Type controls:Flyout}" />
+
+</ResourceDictionary>