Can be busy user control

[oriches]

[ContentProperty("Content")]
[TemplatePart(Name = "PART_OverlayGrid", Type = typeof(Grid))]
[TemplatePart(Name = "PART_OverlayBorder", Type = typeof(Border))]
[TemplatePart(Name = "PART_OverlaySpinner", Type = typeof(Control))]
public class BusyUserControl : UserControl
{
public static readonly DependencyProperty IsBusyProperty = DependencyProperty.Register("IsBusy",
typeof (bool),
typeof (BusyUserControl),
new PropertyMetadata(default(bool), IsBusyChanged));

    private Grid _overlayGrid;

    public bool IsBusy
    {
        get { return (bool) GetValue(IsBusyProperty); }
        set { SetValue(IsBusyProperty, value); }
    }

    public BusyUserControl()
    {
        try
        {
            Style = (Style)FindResource("Ice.BusyUserControlStyle");
        }
        catch (ArgumentNullException)
        {
        }
        catch (ResourceReferenceKeyNotFoundException)
        {
        }
    }

    public override void OnApplyTemplate()
    {
        base.OnApplyTemplate();

        _overlayGrid = GetTemplateChild("PART_OverlayGrid") as Grid;

        HandleIsBusyChanged(IsBusy);
    }

    private static void IsBusyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var control = d as BusyUserControl;
        if (control != null)
        {
            control.HandleIsBusyChanged((bool)e.NewValue);
        }
    }

    private void HandleIsBusyChanged(bool isBusy)
    {
        if (_overlayGrid != null)
        {
            _overlayGrid.Visibility = isBusy ? Visibility.Visible : Visibility.Hidden;
        }
    }
}

<Style x:Key="Ice.BusyUserControlStyle" TargetType="controls:BusyUserControl"> ``` </Style>

 <Style x:Key="Ice.BusyUserControl.AnimationStyle"
           TargetType="Control">

<Setter Property="Template">
    <Setter.Value>
        <ControlTemplate TargetType="Control">
            <ControlTemplate.Resources>
                <Storyboard x:Key="Animation0"
                            BeginTime="00:00:00.0"
                            RepeatBehavior="Forever">
                    <DoubleAnimation  Storyboard.TargetName="ellipse0"
                                      Storyboard.TargetProperty="Opacity"
                                      From="0"
                                      To="1"
                                      Duration="00:00:00.9"
                                      AutoReverse="True">

                    </DoubleAnimation >
                </Storyboard>
                <Storyboard x:Key="Animation1"
                            BeginTime="00:00:00.2"
                            RepeatBehavior="Forever">
                    <DoubleAnimation  Storyboard.TargetName="ellipse1"
                                      Storyboard.TargetProperty="Opacity"
                                      From="0"
                                      To="1"
                                      Duration="00:00:00.9"
                                      AutoReverse="True">

                    </DoubleAnimation >
                </Storyboard>
                <Storyboard x:Key="Animation2"
                            BeginTime="00:00:00.4"
                            RepeatBehavior="Forever">
                    <DoubleAnimation  Storyboard.TargetName="ellipse2"
                                      Storyboard.TargetProperty="Opacity"
                                      From="0"
                                      To="1"
                                      Duration="00:00:00.9"
                                      AutoReverse="True">

                    </DoubleAnimation >
                </Storyboard>
                <Storyboard x:Key="Animation3"
                            BeginTime="00:00:00.6"
                            RepeatBehavior="Forever">
                    <DoubleAnimation  Storyboard.TargetName="ellipse3"
                                      Storyboard.TargetProperty="Opacity"
                                      From="0"
                                      To="1"
                                      Duration="00:00:00.9"
                                      AutoReverse="True">

                    </DoubleAnimation >
                </Storyboard>
                <Storyboard x:Key="Animation4"
                            BeginTime="00:00:00.8"
                            RepeatBehavior="Forever">
                    <DoubleAnimation  Storyboard.TargetName="ellipse4"
                                      Storyboard.TargetProperty="Opacity"
                                      From="0"
                                      To="1"
                                      Duration="00:00:00.9"
                                      AutoReverse="True">

                    </DoubleAnimation >
                </Storyboard>
                <Storyboard x:Key="Animation5"
                            BeginTime="00:00:01.0"
                            RepeatBehavior="Forever">
                    <DoubleAnimation  Storyboard.TargetName="ellipse5"
                                      Storyboard.TargetProperty="Opacity"
                                      From="0"
                                      To="1"
                                      Duration="00:00:00.9"
                                      AutoReverse="True">

                    </DoubleAnimation >
                </Storyboard>
                <Storyboard x:Key="Animation6"
                            BeginTime="00:00:01.2"
                            RepeatBehavior="Forever">
                    <DoubleAnimation  Storyboard.TargetName="ellipse6"
                                      Storyboard.TargetProperty="Opacity"
                                      From="0"
                                      To="1"
                                      Duration="00:00:00.9"
                                      AutoReverse="True">

                    </DoubleAnimation >
                </Storyboard>
                <Storyboard x:Key="Animation7"
                            BeginTime="00:00:01.4"
                            RepeatBehavior="Forever">
                    <DoubleAnimation  Storyboard.TargetName="ellipse7"
                                      Storyboard.TargetProperty="Opacity"
                                      From="0"
                                      To="1"
                                      Duration="00:00:00.9"
                                      AutoReverse="True">

                    </DoubleAnimation >
                </Storyboard>
            </ControlTemplate.Resources>

            <ControlTemplate.Triggers>
                <Trigger Property="IsVisible"
                         Value="True">
                    <Trigger.EnterActions>
                        <BeginStoryboard Storyboard="{StaticResource Animation0}"
                                         x:Name="Storyboard0" />
                        <BeginStoryboard Storyboard="{StaticResource Animation1}"
                                         x:Name="Storyboard1" />
                        <BeginStoryboard Storyboard="{StaticResource Animation2}"
                                         x:Name="Storyboard2" />
                        <BeginStoryboard Storyboard="{StaticResource Animation3}"
                                         x:Name="Storyboard3" />
                        <BeginStoryboard Storyboard="{StaticResource Animation4}"
                                         x:Name="Storyboard4" />
                        <BeginStoryboard Storyboard="{StaticResource Animation5}"
                                         x:Name="Storyboard5" />
                        <BeginStoryboard Storyboard="{StaticResource Animation6}"
                                         x:Name="Storyboard6" />
                        <BeginStoryboard Storyboard="{StaticResource Animation7}"
                                         x:Name="Storyboard7" />
                    </Trigger.EnterActions>

                    <Trigger.ExitActions>
                        <StopStoryboard BeginStoryboardName="Storyboard0" />
                        <StopStoryboard BeginStoryboardName="Storyboard1" />
                        <StopStoryboard BeginStoryboardName="Storyboard2" />
                        <StopStoryboard BeginStoryboardName="Storyboard3" />
                        <StopStoryboard BeginStoryboardName="Storyboard4" />
                        <StopStoryboard BeginStoryboardName="Storyboard5" />
                        <StopStoryboard BeginStoryboardName="Storyboard6" />
                        <StopStoryboard BeginStoryboardName="Storyboard7" />
                    </Trigger.ExitActions>
                </Trigger>
            </ControlTemplate.Triggers>

            <Border BorderBrush="{TemplateBinding BorderBrush}"
                    BorderThickness="{TemplateBinding BorderThickness}"
                    Background="{TemplateBinding Background}">
                <Grid>
                    <Canvas Height="45"
                            Width="90"
                            Margin="0,-10,0,0"
                            HorizontalAlignment="Center">
                        <Canvas.Resources>
                            <Style TargetType="TextBlock">
                                <Setter Property="Width"
                                        Value="10" />
                                <Setter Property="Height"
                                        Value="10" />
                                <Setter Property="Background">
                                    <Setter.Value>
                                        <Binding Path="Foreground"
                                                 ElementName="label">
                                        </Binding>
                                    </Setter.Value>
                                </Setter>
                                <Setter Property="Opacity"
                                        Value="0" />
                            </Style>
                        </Canvas.Resources>

                        <TextBlock x:Name="ellipse0"
                                   Canvas.Left="0"
                                   Canvas.Top="0" />
                        <TextBlock x:Name="ellipse7"
                                   Canvas.Left="0"
                                   Canvas.Top="15" />
                        <TextBlock x:Name="ellipse6"
                                   Canvas.Left="0"
                                   Canvas.Top="30" />
                        <TextBlock x:Name="ellipse1"
                                   Canvas.Left="15"
                                   Canvas.Top="0" />
                        <TextBlock x:Name="ellipse5"
                                   Canvas.Left="15"
                                   Canvas.Top="30" />
                        <TextBlock x:Name="ellipse2"
                                   Canvas.Left="30"
                                   Canvas.Top="0" />
                        <TextBlock x:Name="ellipse3"
                                   Canvas.Left="30"
                                   Canvas.Top="15" />
                        <TextBlock x:Name="ellipse4"
                                   Canvas.Left="30"
                                   Canvas.Top="30" />
                        <Label Content="Loading"
                               Canvas.Left="55"
                               FontSize="26"
                               VerticalAlignment="Stretch"
                               VerticalContentAlignment="Stretch"
                               HorizontalAlignment="left"
                               Height="45"
                               x:Name="label">

                        </Label>
                    </Canvas>

                </Grid>
            </Border>
        </ControlTemplate>
    </Setter.Value>
</Setter>
</Style>