WPF Trigger animation when Visibility is changed?

Well i have a custom control and when Visibility is changed to Visible I have a Trigger with a enter/exit action but the problem is that when the exit action fires the Visibility is no longer Visible so the animation can't be seen how would I fix this?

here is my Trigger:

<ControlTemplate.Triggers>
    <Trigger Property="Visibility" Value="Visible">
        <Trigger.ExitActions>
            <BeginStoryb开发者_如何学Coard Storyboard="{StaticResource Hide}"/>
        </Trigger.ExitActions>
        <Trigger.EnterActions>
            <BeginStoryboard Storyboard="{StaticResource Show}"/>
        </Trigger.EnterActions>
    </Trigger>
</ControlTemplate.Triggers>

I tried this too and failed. I think it is not possible to accomplish this in a simple ControlTemplate with a Trigger on the Visibility property. What you can do is add an Opacity animation From 1 To 0 to a Trigger for a different property, for instance a DependencyProperty that you add in the code behind yourself.

You could also use ObjectAnimationUsingKeyFrames to set Visibility for animation period. In such case there is no need in any codebehind.

There is a way to achieve it. Not 100 % pure, but works for me:

Don't use Visibility property, but use Opacity and Tag property.

<ListView.Resources>
    <Style TargetType="{x:Type ListViewItem}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type ListViewItem}">
                    <Border CornerRadius="5" 
                            BorderThickness="2" 
                            BorderBrush="DodgerBlue"
                            Background="#CC4f9dea" >
                        <Grid>
                            <ContentPresenter HorizontalAlignment="Stretch" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="Stretch" />
                            <Button x:Name="btnClose" Opacity="0" Content="X" Style="{StaticResource RoundedButtonStyle}"/>
                        </Grid>
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter Property="Tag" TargetName="btnClose" Value="Visible" />
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ListView.Resources>

<Style x:Key="RoundedButtonStyle" TargetType="{x:Type Button}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="Button">
                <Border CornerRadius="15" Background="White" BorderThickness="1" Padding="2" BorderBrush="Black">
                    <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center" />
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
    <Style.Triggers>
        <Trigger Property="Tag" Value="Visible">
            <Trigger.EnterActions>
                <BeginStoryboard>
                    <Storyboard>
                        <DoubleAnimation Storyboard.TargetProperty="Opacity"
                         From="0.0" To="0.5" Duration="0:0:0.5"/>
                    </Storyboard>
                </BeginStoryboard>
            </Trigger.EnterActions>
            <Trigger.ExitActions>
                <BeginStoryboard>
                    <Storyboard>
                        <DoubleAnimation Storyboard.TargetProperty="Opacity"
                         From="0.5" To="0.0" Duration="0:0:0.5"/>
                    </Storyboard>
                </BeginStoryboard>
            </Trigger.ExitActions>
        </Trigger>
    </Style.Triggers>
</Style>