PDFOffice_Windows_exe/PDF Office/CustomControl/LoadingControl.xaml

<UserControl
    x:Class="PDF_Office.CustomControl.LoadingControl"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:local="clr-namespace:PDF_Office.CustomControl"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    d:DesignHeight="450"
    d:DesignWidth="800"
    mc:Ignorable="d">
    <Grid>
        <Grid.Background>
            <SolidColorBrush Opacity="0.05" Color="Gray" />
        </Grid.Background>
        <Grid
            HorizontalAlignment="Center"
            VerticalAlignment="Center"
            Background="Transparent">
            <Grid
                Width="100"
                Height="100"
                Background="Transparent">
                <Grid.Resources>
                    <DrawingBrush
                        x:Key="brush"
                        AlignmentX="Center"
                        AlignmentY="Top"
                        Stretch="None">
                        <DrawingBrush.Drawing>
                            <GeometryDrawing Brush="Gray">
                                <GeometryDrawing.Geometry>
                                    <EllipseGeometry RadiusX="5" RadiusY="5" />
                                </GeometryDrawing.Geometry>
                            </GeometryDrawing>
                        </DrawingBrush.Drawing>
                    </DrawingBrush>
                </Grid.Resources>

                <Rectangle
                    x:Name="r01"
                    Fill="{StaticResource brush}"
                    Opacity="1"
                    RenderTransformOrigin="0.5,0.5">
                    <Rectangle.RenderTransform>
                        <RotateTransform Angle="0" />
                    </Rectangle.RenderTransform>
                </Rectangle>
                <Rectangle
                    x:Name="r02"
                    Fill="{StaticResource brush}"
                    RenderTransformOrigin="0.5,0.5">
                    <Rectangle.RenderTransform>
                        <RotateTransform Angle="30" />
                    </Rectangle.RenderTransform>
                </Rectangle>
                <Rectangle
                    x:Name="r03"
                    Fill="{StaticResource brush}"
                    RenderTransformOrigin="0.5,0.5">
                    <Rectangle.RenderTransform>
                        <RotateTransform Angle="60" />
                    </Rectangle.RenderTransform>
                </Rectangle>
                <Rectangle
                    x:Name="r04"
                    Fill="{StaticResource brush}"
                    RenderTransformOrigin="0.5,0.5">
                    <Rectangle.RenderTransform>
                        <RotateTransform Angle="90" />
                    </Rectangle.RenderTransform>
                </Rectangle>
                <Rectangle
                    x:Name="r05"
                    Fill="{StaticResource brush}"
                    RenderTransformOrigin="0.5,0.5">
                    <Rectangle.RenderTransform>
                        <RotateTransform Angle="120" />
                    </Rectangle.RenderTransform>
                </Rectangle>
                <Rectangle
                    x:Name="r06"
                    Fill="{StaticResource brush}"
                    RenderTransformOrigin="0.5,0.5">
                    <Rectangle.RenderTransform>
                        <RotateTransform Angle="150" />
                    </Rectangle.RenderTransform>
                </Rectangle>
                <Rectangle
                    x:Name="r07"
                    Fill="{StaticResource brush}"
                    RenderTransformOrigin="0.5,0.5">
                    <Rectangle.RenderTransform>
                        <RotateTransform Angle="180" />
                    </Rectangle.RenderTransform>
                </Rectangle>
                <Rectangle
                    x:Name="r08"
                    Fill="{StaticResource brush}"
                    RenderTransformOrigin="0.5,0.5">
                    <Rectangle.RenderTransform>
                        <RotateTransform Angle="210" />
                    </Rectangle.RenderTransform>
                </Rectangle>
                <Rectangle
                    x:Name="r09"
                    Fill="{StaticResource brush}"
                    RenderTransformOrigin="0.5,0.5">
                    <Rectangle.RenderTransform>
                        <RotateTransform Angle="240" />
                    </Rectangle.RenderTransform>
                </Rectangle>
                <Rectangle
                    x:Name="r10"
                    Fill="{StaticResource brush}"
                    RenderTransformOrigin="0.5,0.5">
                    <Rectangle.RenderTransform>
                        <RotateTransform Angle="270" />
                    </Rectangle.RenderTransform>
                </Rectangle>
                <Rectangle
                    x:Name="r11"
                    Fill="{StaticResource brush}"
                    RenderTransformOrigin="0.5,0.5">
                    <Rectangle.RenderTransform>
                        <RotateTransform Angle="300" />
                    </Rectangle.RenderTransform>
                </Rectangle>
                <Rectangle
                    x:Name="r12"
                    Fill="{StaticResource brush}"
                    RenderTransformOrigin="0.5,0.5">
                    <Rectangle.RenderTransform>
                        <RotateTransform Angle="330" />
                    </Rectangle.RenderTransform>
                </Rectangle>
                <Grid.Triggers>
                    <EventTrigger RoutedEvent="Grid.Loaded">
                        <BeginStoryboard>
                            <Storyboard RepeatBehavior="Forever">
                                <DoubleAnimation
                                    AutoReverse="True"
                                    BeginTime="0:0:0.00000"
                                    Storyboard.TargetName="r01"
                                    Storyboard.TargetProperty="Opacity"
                                    To="0"
                                    Duration="0:0:0.08333" />
                                <DoubleAnimation
                                    AutoReverse="True"
                                    BeginTime="0:0:0.08333"
                                    Storyboard.TargetName="r02"
                                    Storyboard.TargetProperty="Opacity"
                                    To="0"
                                    Duration="0:0:0.08333" />
                                <DoubleAnimation
                                    AutoReverse="True"
                                    BeginTime="0:0:0.16666"
                                    Storyboard.TargetName="r03"
                                    Storyboard.TargetProperty="Opacity"
                                    To="0"
                                    Duration="0:0:0.08333" />
                                <DoubleAnimation
                                    AutoReverse="True"
                                    BeginTime="0:0:0.24999"
                                    Storyboard.TargetName="r04"
                                    Storyboard.TargetProperty="Opacity"
                                    To="0"
                                    Duration="0:0:0.08333" />
                                <DoubleAnimation
                                    AutoReverse="True"
                                    BeginTime="0:0:0.33332"
                                    Storyboard.TargetName="r05"
                                    Storyboard.TargetProperty="Opacity"
                                    To="0"
                                    Duration="0:0:0.08333" />
                                <DoubleAnimation
                                    AutoReverse="True"
                                    BeginTime="0:0:0.41665"
                                    Storyboard.TargetName="r06"
                                    Storyboard.TargetProperty="Opacity"
                                    To="0"
                                    Duration="0:0:0.08333" />
                                <DoubleAnimation
                                    AutoReverse="True"
                                    BeginTime="0:0:0.49998"
                                    Storyboard.TargetName="r07"
                                    Storyboard.TargetProperty="Opacity"
                                    To="0"
                                    Duration="0:0:0.08333" />
                                <DoubleAnimation
                                    AutoReverse="True"
                                    BeginTime="0:0:0.58331"
                                    Storyboard.TargetName="r08"
                                    Storyboard.TargetProperty="Opacity"
                                    To="0"
                                    Duration="0:0:0.08333" />
                                <DoubleAnimation
                                    AutoReverse="True"
                                    BeginTime="0:0:0.66664"
                                    Storyboard.TargetName="r09"
                                    Storyboard.TargetProperty="Opacity"
                                    To="0"
                                    Duration="0:0:0.08333" />
                                <DoubleAnimation
                                    AutoReverse="True"
                                    BeginTime="0:0:0.74997"
                                    Storyboard.TargetName="r10"
                                    Storyboard.TargetProperty="Opacity"
                                    To="0"
                                    Duration="0:0:0.08333" />
                                <DoubleAnimation
                                    AutoReverse="True"
                                    BeginTime="0:0:0.83330"
                                    Storyboard.TargetName="r11"
                                    Storyboard.TargetProperty="Opacity"
                                    To="0"
                                    Duration="0:0:0.08333" />
                                <DoubleAnimation
                                    AutoReverse="True"
                                    BeginTime="0:0:0.91663"
                                    Storyboard.TargetName="r12"
                                    Storyboard.TargetProperty="Opacity"
                                    To="0"
                                    Duration="0:0:0.08333" />
                            </Storyboard>
                        </BeginStoryboard>
                    </EventTrigger>
                </Grid.Triggers>
            </Grid>
        </Grid>
    </Grid>
</UserControl>