Use EventTrigger elements to animate the MouseEnter and OnMouseLeave events of a Rectangle.

     

<Page 
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <Page.Resources>
    <Style TargetType="Rectangle">
      <Setter Property="Width" Value="50" />
      <Setter Property="Height" Value="50" />
      <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>
  </Page.Resources>

  <StackPanel HorizontalAlignment="Left">
    <Rectangle Fill="Red" />
  </StackPanel>

</Page>

1.	Enter and exit actions MouseEnter and MouseLeave, Unloaded
2.	Multi Trigger: Pressed, Mouse over
3.	Triggers: Control.IsFocused, Control.IsMouseOver, Button.IsPressed
4.	Apply Multiple Triggers to the Same Element
5.	Focused Trigger
6.	Evaluate Multiple Properties for the Same Trigger
7.	Window Load as Animation Trigger
8.	Using a Trigger to modify the appearance of Button elements
9.	Using a Trigger to modify the appearance of a single Button
10.	Declaring a local Trigger
11.	Using a Trigger to modify the appearance of any Control
12.	Using a Trigger to modify multiple attributes of a Button
13.	Simple XAML Animation in EventTrigger
14.	Use DataTriggerand MultiDataTrigger.

Use EventTrigger elements to animate the MouseEnter and OnMouseLeave events of a Rectangle. : EventTrigger « Windows Presentation Foundation « VB.Net

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