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How to: Trigger an Animation When a Property Value Changes

03/30/2017

animation [WPF], starting when property values change

triggering animation [WPF]

Storyboards [WPF], starting when property values change

12399c21-0300-4f4f-9e3a-d92d9907e5f5

How to: Trigger an Animation When a Property Value Changes

This example shows how to use a xref:System.Windows.Trigger to start a xref:System.Windows.Media.Animation.Storyboard when a property value changes. You can use a xref:System.Windows.Trigger inside a xref:System.Windows.Style, xref:System.Windows.Controls.ControlTemplate, or xref:System.Windows.DataTemplate.

Example

The following example uses a xref:System.Windows.Trigger to animate the xref:System.Windows.UIElement.Opacity%2A of a xref:System.Windows.Controls.Button when its xref:System.Windows.UIElement.IsMouseOver%2A property becomes true.

[!code-xamlAnimatePropertyStoryboards#PropertyTriggerExample]

Animations applied by property xref:System.Windows.Trigger objects behave in a more complex fashion than xref:System.Windows.EventTrigger animations or animations started using xref:System.Windows.Media.Animation.Storyboard methods. They "handoff" with animations defined by other xref:System.Windows.Trigger objects, but compose with xref:System.Windows.EventTrigger and method-triggered animations.

See also