Extend the style to capture click event - wpf

I am trying to build a designer like visual studio.
Take a look at the xaml:
<Style x:Key="myStyle" TargetType="{x:Type Border}">
<Setter Property="BorderBrush" Value="Transparent" />
<Setter Property="BorderThickness" Value="2" />
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="BorderBrush" Value="DodgerBlue" />
</Trigger>
</Style.Triggers>
</Style>
...
...
...
<Border Style="myStyle">
<Grid>
<Border Style="myStyle">
<Rectangle Fill="Transparent" />
<TextBlock Text="abc" />
</Border>
</Grid>
</Border>
The above code is working perfectly. Now I want to extend the above style, such that the border's color should change to green when I click on any of the control.
Update :
I have changed the above style to something like below code.
<Style x:Key="BorderStyle" TargetType="{x:Type Border}">
<Setter Property="BorderBrush" Value="Transparent" />
<Setter Property="BorderThickness" Value="2" />
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="BorderBrush" Value="DodgerBlue" />
</Trigger>
<EventTrigger RoutedEvent="MouseDown">
<EventTrigger.Actions>
<BeginStoryboard>
<Storyboard>
<ColorAnimation Storyboard.TargetProperty="BorderBrush.Color" To="Green" Duration="0:0:0.100" />
</Storyboard>
</BeginStoryboard>
</EventTrigger.Actions>
</EventTrigger>
</Style.Triggers>
</Style>
Now I can see the border is changing its color to green when I click on it. But when mouse leaves the textblock, the border changes its color back to transparent.

<Style.Triggers>
<EventTrigger RoutedEvent="MouseDown">
<Setter Property="BorderBrush" Value="DodgerBlue" />
</EventTrigger>
</Style.Triggers>
and you dont want to bind the style for all the border, if you need to apply that style for all the border, just remove the key name of that style. It will apply to all the Targeted Control.
If you need to check and apply the color as like the button click as like a Toggle button, you need to maintain a property and that property is to be given in the trigger and it need to be changed in the button's click..

Try this
<Style x:Key="myStyle" TargetType="{x:Type Border}">
<Setter Property="Background" Value="Transparent"/>
<Setter Property="BorderBrush">
<Setter.Value>
<SolidColorBrush x:Name="BorderBrushColor" Color="Transparent"></SolidColorBrush>
</Setter.Value>
</Setter>
<Setter Property="BorderThickness" Value="2" />
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="BorderBrush" Value="DodgerBlue" />
</Trigger>
<EventTrigger RoutedEvent="MouseDown">
<BeginStoryboard>
<Storyboard>
<ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)">
<EasingColorKeyFrame KeyTime="0" Value="Green" />
</ColorAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Style.Triggers>
</Style>

Try this
<Style x:Key="myStyle" TargetType="{x:Type Border}">
<Setter Property="Background" Value="Transparent"/>
<Setter Property="BorderBrush">
<Setter.Value>
<SolidColorBrush x:Name="BorderBrushColor" Color="Transparent"></SolidColorBrush>
</Setter.Value>
</Setter>
<Setter Property="BorderThickness" Value="2" />
<Style.Triggers>
<EventTrigger RoutedEvent="MouseEnter">
<BeginStoryboard>
<Storyboard>
<ColorAnimationUsingKeyFrames FillBehavior="HoldEnd" Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)">
<EasingColorKeyFrame KeyTime="0" Value="DodgerBlue" />
</ColorAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
<EventTrigger RoutedEvent="MouseDown">
<BeginStoryboard>
<Storyboard>
<ColorAnimationUsingKeyFrames FillBehavior="HoldEnd" Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)">
<EasingColorKeyFrame KeyTime="0" Value="Green" />
</ColorAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Style.Triggers>
</Style>

Add this code in previous style
<Trigger Property="IsMouseOver" Value="False">
<Trigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<ColorAnimationUsingKeyFrames FillBehavior="HoldEnd" Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)">
<EasingColorKeyFrame KeyTime="0" Value="Transparent" />
</ColorAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</Trigger.EnterActions>
</Trigger>

Related

WPF Animation on TextBox Border On IsMouseOver when Not Focused

I am implementing custom styles for the TextBox type in a WPF app I am working on, and I want to implement different animations for when the cursor is over the TextBox, and when the TextBox is actually focused. How my code currently works is the IsMouseOver trigger fires and starts the animation even when the TextBox already has focus. I do not want this, I want the IsMouseOver animation to play only when the TextBox is not focused and when the user hovers over the TextBox. Is this possible in XAML?
Here is my existing code:
<Style TargetType="TextBox">
<Setter Property="BorderBrush" Value="Gray" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TextBoxBase}">
<Border x:Name="PART_Border"
Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
CornerRadius="4">
<ScrollViewer x:Name="PART_ContentHost"/>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}" TargetName="PART_Border" />
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}" />
</Trigger>
<Trigger Property="IsFocused" Value="True">
<Trigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<ColorAnimation Duration="0:0:0.15" Storyboard.TargetName="PART_Border" Storyboard.TargetProperty="BorderBrush.Color" To="#0079CB" />
</Storyboard>
</BeginStoryboard>
</Trigger.EnterActions>
<Trigger.ExitActions>
<BeginStoryboard>
<Storyboard>
<ColorAnimation Duration="0:0:0.15" Storyboard.TargetName="PART_Border" Storyboard.TargetProperty="BorderBrush.Color" To="#CBCBCB" />
</Storyboard>
</BeginStoryboard>
</Trigger.ExitActions>
</Trigger>
<Trigger Property="IsMouseOver" Value="True">
<Trigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<ColorAnimation Duration="0:0:0.15" Storyboard.TargetName="PART_Border" Storyboard.TargetProperty="BorderBrush.Color" To="#5A5A5A" />
</Storyboard>
</BeginStoryboard>
</Trigger.EnterActions>
<Trigger.ExitActions>
<BeginStoryboard>
<Storyboard>
<ColorAnimation Duration="0:0:0.15" Storyboard.TargetName="PART_Border" Storyboard.TargetProperty="BorderBrush.Color" To="#CBCBCB" />
</Storyboard>
</BeginStoryboard>
</Trigger.ExitActions>
</Trigger>
<Trigger Property="Validation.HasError" Value="True">
<Setter Property="FocusManager.FocusedElement" Value="{Binding RelativeSource={RelativeSource Self}}"/>
<Setter Property="BorderThickness" Value="0" />
</Trigger>
<Trigger Property="Width" Value="Auto">
<Setter Property="MinWidth" Value="100"/>
</Trigger>
<Trigger Property="Height" Value="Auto">
<Setter Property="MinHeight" Value="20"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
Thanks!
I want the IsMouseOver animation to play only when the TextBox is not focused and when the user hovers over the TextBox.
(Emphasis mine)
It's actually just a small adjustment to your existing code. You need to use a MultiTrigger instead of the simple Trigger to account for IsMouseOver and the Focus. Depending on your exact requirements you might want to use IsKeyboardFocusWithin, IsKeyboardFocused or IsFocused for the second condition.
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsMouseOver" Value="True"/>
<Condition Property="IsKeyboardFocusWithin" Value="False"/>
</MultiTrigger.Conditions>
<MultiTrigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<ColorAnimation Duration="0:0:0.15" Storyboard.TargetName="PART_Border"
Storyboard.TargetProperty="BorderBrush.Color" To="#5A5A5A" />
</Storyboard>
</BeginStoryboard>
</MultiTrigger.EnterActions>
<MultiTrigger.ExitActions>
<BeginStoryboard>
<Storyboard>
<ColorAnimation Duration="0:0:0.15" Storyboard.TargetName="PART_Border"
Storyboard.TargetProperty="BorderBrush.Color" To="#CBCBCB" />
</Storyboard>
</BeginStoryboard>
</MultiTrigger.ExitActions>
</MultiTrigger>

WPF: Stop Animation For Hidden Controls on Windows Load

I have a very simple fade in/out animation which works fine using data triggers. I have bind the data trigger to a bool property and inside trigger it set the opacity to 0 on false and vice versa.
Now the problem is the objects whose bool value is false upon loading, I don't expect them to show on load and then animate themselves to hide.
I have tried to set the opacity to 0 on style setter but no use
Here is the button style
<Style x:Key="LocationPickerButtonStyle" TargetType="{x:Type Button}">
<Style.Setters>
<Setter Property="Height" Value="93"/>
<Setter Property="Width" Value="93"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Grid >
<Image x:Name="DefaultImage" Source="something.png"/>
<Ellipse x:Name="HitTest" Fill="Transparent" Height="93" Width="93" HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Grid>
<ControlTemplate.Triggers>
<DataTrigger Binding="{Binding IsLocationVisible}" Value="true">
<DataTrigger.EnterActions>
<BeginStoryboard x:Name="showSelectedLocation">
<Storyboard Storyboard.TargetProperty="Opacity">
<DoubleAnimation Duration="0:0:1" From="0" To="1"/>
</Storyboard>
</BeginStoryboard>
</DataTrigger.EnterActions>
<DataTrigger.ExitActions>
<StopStoryboard BeginStoryboardName="showSelectedLocation"></StopStoryboard>
</DataTrigger.ExitActions>
</DataTrigger>
<DataTrigger Binding="{Binding IsLocationVisible}" Value="false">
<DataTrigger.EnterActions>
<BeginStoryboard x:Name="hideSelectedLocation">
<Storyboard Storyboard.TargetProperty="Opacity" >
<DoubleAnimation Duration="0:0:1" From="1" To="0" />
</Storyboard>
</BeginStoryboard>
</DataTrigger.EnterActions>
<DataTrigger.ExitActions>
<StopStoryboard BeginStoryboardName="hideSelectedLocation"></StopStoryboard>
</DataTrigger.ExitActions>
</DataTrigger>
<Trigger Property="Opacity" Value="0">
<Setter Property="Visibility" Value="Collapsed"></Setter>
</Trigger>
<Trigger Property="Opacity" Value="1">
<Setter Property="Visibility" Value="Visible"></Setter>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style.Setters>
</Style>
Do these changes in your XAML :
Shift your DataTriggers from <ControlTemplate.Triggers> to Style.Triggers.
Set Opacity = 0 in Style Setter as starting Opacity for every Button.
Remove From = 1 in false DataTrigger.
With all the changes, your Style would look like this :
<Style x:Key="LocationPickerButtonStyle" TargetType="{x:Type Button}">
<Style.Triggers>
<DataTrigger Binding="{Binding IsLocationVisible}" Value="true">
<DataTrigger.EnterActions>
<BeginStoryboard x:Name="showSelectedLocation">
<Storyboard Storyboard.TargetProperty="Opacity">
<DoubleAnimation Duration="0:0:1" From="0" To="1"/>
</Storyboard>
</BeginStoryboard>
</DataTrigger.EnterActions>
<DataTrigger.ExitActions>
<StopStoryboard BeginStoryboardName="showSelectedLocation"></StopStoryboard>
</DataTrigger.ExitActions>
</DataTrigger>
<DataTrigger Binding="{Binding IsLocationVisible}" Value="false">
<DataTrigger.EnterActions>
<BeginStoryboard x:Name="hideSelectedLocation">
<Storyboard Storyboard.TargetProperty="Opacity" >
<DoubleAnimation Duration="0:0:1" To="0" />
</Storyboard>
</BeginStoryboard>
</DataTrigger.EnterActions>
<DataTrigger.ExitActions>
<StopStoryboard BeginStoryboardName="hideSelectedLocation"></StopStoryboard>
</DataTrigger.ExitActions>
</DataTrigger>
</Style.Triggers>
<Style.Setters>
<Setter Property="Height" Value="93"/>
<Setter Property="Width" Value="93"/>
<Setter Property="Opacity" Value="0"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Grid >
<Image x:Name="DefaultImage" Source="something.png"/>
<Ellipse x:Name="HitTest" Fill="Transparent" Height="93" Width="93" HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="Opacity" Value="0">
<Setter Property="Visibility" Value="Collapsed"></Setter>
</Trigger>
<Trigger Property="Opacity" Value="1">
<Setter Property="Visibility" Value="Visible"></Setter>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style.Setters>
</Style>

WPF Animation of DataGridRow Background color from transparent to "Current" (current is set with Trigger)

I'm setting DataGridRow BackgroundColor to Green or to Red with trigger based on LogError value.
I want to animate newly added rows with transparency.
This works fine:
From="Transparent" To="Red"
But what I want color to goes to is current color set with Style. Its not always Red it could be Green as well.
This does not work:
From="Transparent" To="{TemplateBinding DataGridRow.Background}"
or
From="Transparent" To="{Binding RelativeSource={RelativeSource Self}, Path=Backgound}"
Code:
<DataGrid.Resources>
<Style TargetType="{x:Type DataGridRow}">
<Setter Property = "Background" Value="LimeGreen"/>
<Style.Triggers>
<DataTrigger Binding="{Binding LogMessage}" Value="Exception has occured">
<Setter Property = "Background" Value="Red"/>
</DataTrigger>
</Style.Triggers>
</Style>
</DataGrid.Resources>
<DataGrid.RowStyle>
<Style TargetType="DataGridRow">
<Style.Triggers>
<EventTrigger RoutedEvent="Loaded">
<BeginStoryboard>
<Storyboard>
<ColorAnimation
Storyboard.TargetProperty="(DataGridRow.Background).(SolidColorBrush.Color)"
Duration="00:00:03"
From="Transparent"
To="{TemplateBinding DataGridRow.Background}"/>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Style.Triggers>
</Style>
</DataGrid.RowStyle>
Error message: Cannot freeze this Storyboard timeline tree for use across threads.
There are few problems in your XAML code.
First, you have specified default style under resources section of DataGrid and later provide your own style which will override default style.
Either you should define new style and set its BasedOn DP to refer to default style. But in your case i don't see any use of defining separate style just for trigger.
Second, you want your animation to go from Transparent to colour selected in style which can either by LimeGreen or Red depending on trigger. So, you should not set To value in your animation since it will automatically picked up.
This will work as you desire -
<DataGrid>
<DataGrid.Resources>
<Style TargetType="{x:Type DataGridRow}">
<Setter Property ="Background" Value="LimeGreen"/>
<Style.Triggers>
<DataTrigger Binding="{Binding LogMessage}"
Value="Exception has occured">
<Setter Property = "Background" Value="Red"/>
</DataTrigger>
<EventTrigger RoutedEvent="Loaded">
<BeginStoryboard>
<Storyboard>
<ColorAnimation Storyboard.TargetProperty=
"(DataGridRow.Background).(SolidColorBrush.Color)"
Duration="00:00:03"
From="Transparent"/>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Style.Triggers>
</Style>
</DataGrid.Resources>
</DataGrid>
#Den
You have to determinate a standart Color, before you animate. This is my Style for animating a row and cell.
<Style TargetType="{x:Type DataGridRow}">
<Style.Setters>
<Setter Property="BorderThickness" Value="1"/>
<Setter Property="Background" Value="Transparent"/>
</Style.Setters>
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="BorderBrush" Value="#FFF37C21"/>
</Trigger>
<Trigger Property="IsSelected" Value="True">
<Trigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<ColorAnimation Storyboard.TargetProperty="(DataGridRow.Background).(SolidColorBrush.Color)" Duration="00:00:0.2" To="#FFF37C21"/>
</Storyboard>
</BeginStoryboard>
</Trigger.EnterActions>
<Trigger.ExitActions>
<BeginStoryboard>
<Storyboard>
<ColorAnimation Storyboard.TargetProperty="(DataGridRow.Background).(SolidColorBrush.Color)" Duration="00:00:0.2" To="Transparent"/>
</Storyboard>
</BeginStoryboard>
</Trigger.ExitActions>
</Trigger>
</Style.Triggers>
</Style>
<Style TargetType="{x:Type DataGridCell}">
<Style.Setters>
<Setter Property="FontWeight" Value="Light"/>
<Setter Property="BorderThickness" Value="0"/>
<Setter Property="IsTabStop" Value="False" />
<Setter Property="FocusVisualStyle" Value="{x:Null}"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type DataGridCell}">
<Grid x:Name="gridCell" Background="#00FFFFFF">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="3"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="30"/>
</Grid.RowDefinitions>
<ContentPresenter
Grid.Column="1"
HorizontalAlignment="Left"
VerticalAlignment="Center"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style.Setters>
<Style.Triggers>
<Trigger Property="IsSelected" Value="True">
<Setter Property="Foreground" Value="Black"/>
<Trigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(TextElement.FontWeight)">
<DiscreteObjectKeyFrame KeyTime="00:00:0.2">
<DiscreteObjectKeyFrame.Value>
<FontWeight>Bold</FontWeight>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</Trigger.EnterActions>
<Trigger.ExitActions>
<BeginStoryboard>
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(TextElement.FontWeight)">
<DiscreteObjectKeyFrame KeyTime="00:00:0.2">
<DiscreteObjectKeyFrame.Value>
<FontWeight>Light</FontWeight>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</Trigger.ExitActions>
</Trigger>
</Style.Triggers>
</Style>
</Style.Resources>
</Style>

'Setter' object cannot be added to 'EventTrigger'?

I get the following error on the WPF code bellow:
'Setter' object cannot be added to 'EventTrigger'. The given object must be an instance of TriggerAction or a derived type.
<Style x:Key="LinkLabel" TargetType="{x:Type Label}">
<Setter Property="FontFamily" Value="Tahoma"/>
<Setter Property="FontSize" Value="12"/>
<Setter Property="Foreground" Value="DarkBlue"/>
<Style.Triggers>
<EventTrigger RoutedEvent="MouseEnter" >
<Setter Property="Cursor" Value="Hand"/>
</EventTrigger>
<EventTrigger RoutedEvent="MouseDown" >
<Setter Property="Foreground" Value="Red"/>
</EventTrigger>
<EventTrigger RoutedEvent="MouseUp" >
<Setter Property="Foreground" Value="DarkBlue"/>
</EventTrigger>
</Style.Triggers>
</Style>
Can anyone explain and point me in the right direction ?
MadSeb
Option 1 - Use BeginStoryboard like ChrisF said
Option 2 - Don't use EventTrigger - for example, for a label that changes background color when you mouse over it use:
<Style TargetType="Label">
<Setter Property="Background" Value="Blue"/>
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="true" >
<Setter Property="Background" Value="Red"/>
</Trigger>
</Style.Triggers>
</Style>
Unfortunately there is no property IsMouseDown you can use.
About your example:
You don't have to set the cursor on MouseEnter, just set the Cursor property and it will only affect the mouse cursor when the mouse is over the control.
If you want to create an hyperlink control don't use a label, eitehr use a Button with a custom template (this will give you the Click event and IsPressed property) or, even better - use the Hyperlink class like this:
<TextBlock><Hyperlink>This is a link</Hyperlink></TextBlock>
This will have all the styling you wanted.
You must use a TriggerAction to change the values as in this example from the EventTriggers MSDN page:
<Style TargetType="Rectangle">
<Setter Property="Width" Value="50" />
<Setter Property="Height" Value="50" />
<Setter Property="Margin" Value="20" />
<Setter Property="HorizontalAlignment" Value="Left" />
<Style.Triggers>
<EventTrigger RoutedEvent="MouseEnter">
<BeginStoryboard>
<Storyboard>
<DoubleAnimation To="300" Duration="0:0:1.5"
AccelerationRatio="0.10" DecelerationRatio="0.25"
Storyboard.TargetProperty="(Canvas.Width)" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
<EventTrigger RoutedEvent="MouseLeave">
<BeginStoryboard>
<Storyboard>
<DoubleAnimation Duration="0:0:1.5"
AccelerationRatio="0.10" DecelerationRatio="0.25"
Storyboard.TargetProperty="(Canvas.Width)" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Style.Triggers>
</Style>

How to animate Opacity of a DropShadowEffect?

I have a WPF project with a border using the following style. The plan is to get the glow effect to fade in when the mouse moves over the border, and fade out when it leaves.
<Style x:Key="BorderGlow" TargetType="Border">
<Style.Resources>
<Storyboard x:Key="GlowOn">
<DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetProperty="(DropShadowEffect.Opacity)">
<SplineDoubleKeyFrame KeyTime="0:0:0.3" Value="1"/>
</DoubleAnimationUsingKeyFrames>
</Storyboard>
<Storyboard x:Key="GlowOff">
<DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetProperty="(DropShadowEffect.Opacity)">
<SplineDoubleKeyFrame KeyTime="0:0:0.3" Value="0"/>
</DoubleAnimationUsingKeyFrames>
</Storyboard>
</Style.Resources>
<Setter Property="CornerRadius" Value="6,1,6,1" />
<Setter Property="BorderBrush" Value="{StaticResource SelectedBorder}" />
<Setter Property="BorderThickness" Value="1" />
<Setter Property="Background" Value="{StaticResource DeselectedBackground}" />
<Setter Property="RenderTransformOrigin" Value="0.5,0.5" />
<Setter Property="TextBlock.Foreground" Value="{StaticResource SelectedForeground}" />
<Setter Property="RenderTransform">
<Setter.Value>
<RotateTransform Angle="90"/>
</Setter.Value>
</Setter>
<Setter Property="Effect">
<Setter.Value>
<DropShadowEffect ShadowDepth="0" BlurRadius="8" Color="#FFB0E9EF"/>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Trigger.EnterActions>
<BeginStoryboard Storyboard="{StaticResource GlowOn}"/>
</Trigger.EnterActions>
<Trigger.ExitActions>
<BeginStoryboard Storyboard="{StaticResource GlowOff}"/>
</Trigger.ExitActions>
</Trigger>
</Style.Triggers>
</Style>
The problem is, nothing happens! The animation works if I change the "DropShadowEffect" to "UIElement" in the Storyboard TargetProperty, but this fades the entire control.
How do I fade just the DropShadowEffect?
A couple of points to note
1) You need to be targeting an actual property of Border - You are in effect trying to target the value (DropShadowEffect) of the Effect property, not the property itself.
2) You need to sort the syntax of the PropertyPath.
Change your Storyboard.Target property to the following and you should be fine:
Storyboard.TargetProperty="(Effect).Opacity"
EDIT Working code as noted in comment:
<Border BorderThickness="10" Height="100" Width="100">
<Border.BorderBrush>
<SolidColorBrush Color="Red"></SolidColorBrush>
</Border.BorderBrush>
<Border.Style>
<Style TargetType="Border">
<Style.Resources>
<Storyboard x:Key="GlowOn">
<DoubleAnimationUsingKeyFrames BeginTime="00:00:00"
Storyboard.TargetProperty="(Effect).Opacity">
<SplineDoubleKeyFrame KeyTime="0:0:0.3" Value="1"/>
</DoubleAnimationUsingKeyFrames>
</Storyboard>
<Storyboard x:Key="GlowOff">
<DoubleAnimationUsingKeyFrames BeginTime="00:00:00"
Storyboard.TargetProperty="(Effect).Opacity">
<SplineDoubleKeyFrame KeyTime="0:0:0.3" Value="0"/>
</DoubleAnimationUsingKeyFrames>
</Storyboard>
</Style.Resources>
<Setter Property="CornerRadius" Value="6,1,6,1" />
<!--<Setter Property="BorderBrush"
Value="{StaticResource SelectedBorder}" />-->
<Setter Property="BorderThickness" Value="1" />
<!--<Setter Property="Background"
Value="{StaticResource DeselectedBackground}" />-->
<Setter Property="RenderTransformOrigin" Value="0.5,0.5" />
<!--<Setter Property="TextBlock.Foreground"
Value="{StaticResource SelectedForeground}" />-->
<Setter Property="RenderTransform">
<Setter.Value>
<RotateTransform Angle="90"/>
</Setter.Value>
</Setter>
<Setter Property="Effect">
<Setter.Value>
<DropShadowEffect ShadowDepth="20"
BlurRadius="8"
Color="#FFB0E9EF"/>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Trigger.EnterActions>
<BeginStoryboard
Storyboard="{StaticResource GlowOn}"/>
</Trigger.EnterActions>
<Trigger.ExitActions>
<BeginStoryboard
Storyboard="{StaticResource GlowOff}"/>
</Trigger.ExitActions>
</Trigger>
</Style.Triggers>
</Style>
</Border.Style>
</Border>
This is a followup to Simon's answer where I have a ListView where the Template item of the ListViewItem had a DropShadow on a Grid. Long story short, because one is overriding the ListViewItem, the selected item and the hover no longer work. To get those to work I had to modify the Opacity and there are two ways to access the Effect depending on where one is; which I show below...here are Full example of the two snippets:
Set during Selection
<ListView.ItemContainerStyle>
<Style TargetType="ListViewItem">
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Cursor" Value="Hand"/>
</Trigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsSelected" Value="true" />
<Condition Property="Selector.IsSelectionActive" Value="true" />
</MultiTrigger.Conditions>
<Setter Property="FontWeight" Value="Bold" />
<Setter Property="Effect">
<Setter.Value>
<DropShadowEffect Opacity="1"/>
</Setter.Value>
</Setter>
</MultiTrigger>
</Style.Triggers>
Set for Grid.Triggers
<Grid Background="GhostWhite">
<Grid.Effect>
<DropShadowEffect Opacity="0" />
</Grid.Effect>
<GridViewRowPresenter Content="{TemplateBinding Content}"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
<Grid.Triggers>
<EventTrigger RoutedEvent="MouseEnter">
<BeginStoryboard>
<Storyboard>
<DoubleAnimationUsingKeyFrames
BeginTime="00:00:00"
Storyboard.TargetProperty="(Effect).Opacity">
<SplineDoubleKeyFrame KeyTime="0:0:0.1" Value=".2"/>
<SplineDoubleKeyFrame KeyTime="0:0:0.4" Value=".6"/>
<SplineDoubleKeyFrame KeyTime="0:0:0.6" Value="1"/>
</DoubleAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger>

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