Bold changed cells in DataGrid - wpf

Question

I would like to bold changed DataGrid cells when data source gets updated. I found that <EventTrigger RoutedEvent="Binding.TargetUpdated"> is the event I need. However I cannot get the Storyboard to work with the FontWeight property.
Here is what I am trying:
<EventTrigger RoutedEvent="Binding.TargetUpdated">
<BeginStoryboard>
<Storyboard>
<Int32Animation Duration="00:00:05"
Storyboard.TargetProperty="(Int32)(DataGridCell.FontWeight)"
From="400" To="700" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
Can someone please recommend how to get the above fixed or propose new smarter way of bolding changed cells in DataGrid?

Answer 1

This works for me...
I have a resource...
<Style TargetType="TextBlock" x:Key="ElementStyle">
<Style.Triggers>
<EventTrigger RoutedEvent="Binding.TargetUpdated">
<BeginStoryboard>
<Storyboard>
<ObjectAnimationUsingKeyFrames
Duration="00:00:01"
Storyboard.TargetProperty="(TextElement.FontWeight)">
<DiscreteObjectKeyFrame
KeyTime="00:00:00"
Value="{x:Static FontWeights.Thin}" />
<DiscreteObjectKeyFrame
KeyTime="00:00:00.5"
Value="{x:Static FontWeights.Heavy}" />
<DiscreteObjectKeyFrame
KeyTime="00:00:01"
Value="{x:Static FontWeights.UltraBold}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Style.Triggers>
</Style>
Assign this to relevant column,
<toolkit:DataGridTextColumn
Binding="{Binding Quantity, NotifyOnTargetUpdated=True}"
ElementStyle="{StaticResource ElementStyle}" />
EDIT
Bcause the code above makes the default values also Bold, we have another way to do this wherein ONLY the updates done by user would trigger boldness in the cell.
Style
<Style TargetType="Controls:DataGridCell"
BasedOn="{StaticResource {x:Type Controls:DataGridCell}}"
x:Key="CellBoldStyle">
<Style.Triggers>
<EventTrigger RoutedEvent="Binding.SourceUpdated">
<BeginStoryboard>
<Storyboard>
<ObjectAnimationUsingKeyFrames
Duration="00:00:01" Storyboard.TargetProperty
="(TextBlock.FontWeight)">
<DiscreteObjectKeyFrame KeyTime="00:00:00.5"
Value="{x:Static FontWeights.Normal}" />
<DiscreteObjectKeyFrame KeyTime="00:00:01"
Value="{x:Static FontWeights.Bold}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Style.Triggers>
</Style>
Column
<Controls:DataGridTextColumn
Binding="{Binding Side, Mode=TwoWay,
NotifyOnTargetUpdated=True,
NotifyOnSourceUpdated=True}"
CellStyle="{StaticResource CellBoldStyle}" />
Limitations
Virtualized cells would loose the bold highlighted effect when you scroll them out of your scroll view.
Even your TextBox shows Bold value . (I dont know if this is a limitation for you!)