QuickLook/QuickLook.Plugin/QuickLook.Plugin.ImageViewer/ImagePanel.xaml

<UserControl x:Class="QuickLook.Plugin.ImageViewer.ImagePanel"
             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:QuickLook.Plugin.ImageViewer"
             xmlns:animatedImage="clr-namespace:QuickLook.Plugin.ImageViewer.AnimatedImage"
             mc:Ignorable="d"
             x:Name="imagePanel"
             d:DesignHeight="300" d:DesignWidth="300">
    <Grid>
        <Rectangle Visibility="{Binding BackgroundVisibility, ElementName=imagePanel}" RenderOptions.BitmapScalingMode="NearestNeighbor">
            <Rectangle.Fill>
                <ImageBrush x:Name="backgroundBrush" ImageSource="Resources/background-b.png" AlignmentY="Top"
                            Viewport="0,0,32,32"
                            ViewportUnits="Absolute" Stretch="UniformToFill" TileMode="Tile" />
            </Rectangle.Fill>
        </Rectangle>
        <ScrollViewer x:Name="viewPanel" BorderThickness="0" HorizontalScrollBarVisibility="Auto"
                      VerticalScrollBarVisibility="Auto" Focusable="False" IsManipulationEnabled="True">
            <animatedImage:AnimatedImage x:Name="viewPanelImage" Stretch="None" Meta="{Binding Meta, ElementName=imagePanel}"
                                         RenderOptions.BitmapScalingMode="{Binding RenderMode, ElementName=imagePanel}"
                                         AnimationUri="{Binding ImageUriSource, ElementName=imagePanel}" />
        </ScrollViewer>
        <Border x:Name="zoomLevelInfo" CornerRadius="5" IsHitTestVisible="False" Opacity="0" Background="Gray" Padding="15,4,15,4" HorizontalAlignment="Center" VerticalAlignment="Center">
            <TextBlock Foreground="White" FontSize="18" Text="{Binding ElementName=imagePanel, Path=ZoomFactor, StringFormat={}{0:P0}}" />
            <Border.Resources>
                <Storyboard x:Key="StoryboardShowZoomLevelInfo">
                    <DoubleAnimationUsingKeyFrames Storyboard.Target="{Binding Source={x:Reference zoomLevelInfo}}" Storyboard.TargetProperty="Opacity">
                        <DoubleAnimationUsingKeyFrames.KeyFrames>
                            <LinearDoubleKeyFrame Value="0.9" KeyTime="0:0:0.1" />
                            <LinearDoubleKeyFrame Value="0.9" KeyTime="0:0:0.6" />
                            <LinearDoubleKeyFrame Value="0" KeyTime="0:0:0.8" />
                        </DoubleAnimationUsingKeyFrames.KeyFrames>
                    </DoubleAnimationUsingKeyFrames>
                </Storyboard>
            </Border.Resources>
        </Border>
    </Grid>
</UserControl>