优化更新代码，添加界面功能并整合

WPFluent/Controls/Scroll/DynamicScrollViewer.xaml

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+<!--
+    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.
+-->
+
+<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="UiDynamicScrollViewer" TargetType="{x:Type controls:DynamicScrollViewer}">
+        <Setter Property="Margin" Value="0" />
+        <Setter Property="Padding" Value="0" />
+        <Setter Property="VerticalScrollBarVisibility" Value="Auto" />
+        <Setter Property="HorizontalScrollBarVisibility" Value="Disabled" />
+        <Setter Property="PanningMode" Value="Both"/>
+        <Setter Property="SnapsToDevicePixels" Value="True" />
+        <Setter Property="OverridesDefaultStyle" Value="True" />
+        <Setter Property="Template">
+            <Setter.Value>
+                <ControlTemplate TargetType="{x:Type controls:DynamicScrollViewer}">
+                    <Grid>
+                        <Grid.ColumnDefinitions>
+                            <ColumnDefinition Width="*" />
+                            <ColumnDefinition Width="Auto" />
+                        </Grid.ColumnDefinitions>
+                        <Grid.RowDefinitions>
+                            <RowDefinition Height="*" />
+                            <RowDefinition Height="Auto" />
+                        </Grid.RowDefinitions>
+
+
+                        <Border
+                            Grid.Row="0"
+                            Grid.RowSpan="2"
+                            Grid.Column="0"
+                            Grid.ColumnSpan="2"
+                            Padding="{TemplateBinding Padding}">
+                            <ScrollContentPresenter CanContentScroll="{TemplateBinding CanContentScroll}" />
+                        </Border>
+
+                        <controls:DynamicScrollBar
+                            x:Name="PART_VerticalScrollBar"
+                            Grid.Row="0"
+                            Grid.Column="1"
+                            IsScrolling="{TemplateBinding IsScrollingVertically}"
+                            Maximum="{TemplateBinding ScrollableHeight}"
+                            ViewportSize="{TemplateBinding ViewportHeight}"
+                            Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}"
+                            Value="{TemplateBinding VerticalOffset}" />
+
+                        <controls:DynamicScrollBar
+                            x:Name="PART_HorizontalScrollBar"
+                            Grid.Row="1"
+                            Grid.Column="0"
+                            IsScrolling="{TemplateBinding IsScrollingHorizontally}"
+                            Maximum="{TemplateBinding ScrollableWidth}"
+                            Orientation="Horizontal"
+                            ViewportSize="{TemplateBinding ViewportWidth}"
+                            Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}"
+                            Value="{TemplateBinding HorizontalOffset}" />
+                    </Grid>
+                </ControlTemplate>
+            </Setter.Value>
+        </Setter>
+    </Style>
+
+    <Style BasedOn="{StaticResource UiDynamicScrollViewer}" TargetType="{x:Type controls:DynamicScrollViewer}" />
+
+</ResourceDictionary>