kmpdfkit_demo/ComPDFKit.Demo/PDFViewerControl.xaml

<UserControl x:Class="ComPDFKitDemo.PDFViewerControl"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:ComPDFKitDemo"
             xmlns:annotControl="clr-namespace:ComPDFKitDemo.AnnotControl"
             mc:Ignorable="d" 
             d:DesignHeight="450" d:DesignWidth="800">
    <Grid>
        <Border BorderBrush="Silver" BorderThickness="2">
            <Grid x:Name="DocViewerGrid" UseLayoutRounding="True">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="0"/>
                    <ColumnDefinition Width="Auto"/>
                    <ColumnDefinition Width="*" MinWidth="200"/>
                    <ColumnDefinition Width="Auto"/>
                    <ColumnDefinition Width="0" />
                </Grid.ColumnDefinitions>
                <Grid x:Name="NaviBarGrid" Grid.Column="0"></Grid>
                <GridSplitter x:Name="SideWindowSplitter" Grid.Column="1" ShowsPreview="True" Width="10" Visibility="Collapsed" 
                                    HorizontalAlignment="Center" IsTabStop="False" Background="Silver" ResizeBehavior="PreviousAndNext"/>
                <Grid x:Name="PDFGrid" Grid.Column="2" Margin="0,0,0,0" UseLayoutRounding="True"/>
                <Grid x:Name="LoadingAnimation" Grid.Column="2" Background="#A0000000" Visibility="Collapsed">
                    <StackPanel Orientation="Horizontal" VerticalAlignment="Center" HorizontalAlignment="Center">
                        <StackPanel.Triggers>
                            <EventTrigger RoutedEvent="Loaded">
                                <EventTrigger.Actions>
                                    <BeginStoryboard>
                                        <Storyboard RepeatBehavior="Forever">
                                            <DoubleAnimation BeginTime="0:0:0" Duration="0:0:0.2" 
                                                             Storyboard.TargetName="rect1" Storyboard.TargetProperty="Height"
                                                             To="50" AutoReverse="True"/>
                                            <DoubleAnimation BeginTime="0:0:0.1" Duration="0:0:0.2" 
                                                             Storyboard.TargetName="rect2" Storyboard.TargetProperty="Height"
                                                             To="50" AutoReverse="True"/>
                                            <DoubleAnimation BeginTime="0:0:0.2" Duration="0:0:0.2" 
                                                             Storyboard.TargetName="rect3" Storyboard.TargetProperty="Height"
                                                             To="50" AutoReverse="True"/>
                                        </Storyboard>
                                    </BeginStoryboard>
                                </EventTrigger.Actions>
                            </EventTrigger>
                        </StackPanel.Triggers>
                        <Rectangle x:Name="rect1" Width="10" Height="25" Fill="Yellow"></Rectangle>
                        <Rectangle x:Name="rect2" Width="10" Height="25" Fill="Yellow" Margin="10,0,10,0"></Rectangle>
                        <Rectangle x:Name="rect3" Width="10" Height="25" Fill="Yellow"></Rectangle>
                    </StackPanel>
                </Grid>
                <GridSplitter x:Name="AnnotSplitter" Grid.Column="3" ShowsPreview="True" Width="10" Visibility="Collapsed" 
                                    HorizontalAlignment="Center" IsTabStop="False" Background="Silver" ResizeBehavior="PreviousAndNext"/>
                <Grid x:Name="AnnotCtrlGrid" Grid.Column="4"/>
            </Grid>
        </Border>
    </Grid>
</UserControl>