Assembly: PresentationFramework (in presentationframework.dll)
XML Namespace: http://schemas.microsoft.com/winfx/2006/xaml/presentation
/** @property */ public RoutedEvent get_RoutedEvent () /** @property */ public void set_RoutedEvent (RoutedEvent value)
public function get RoutedEvent () : RoutedEvent public function set RoutedEvent (value : RoutedEvent)
Property ValueThe default value is a null reference (Nothing in Visual Basic).
EventTriggers apply a set of actions when the specified routed event occurs. For example, you may want to use EventTriggers to start a set of animations when the mouse pointer is over a certain user interface (UI) control.
If the template or style that contains this EventTrigger does not have the TargetType property specified, then you need to quality the event name with the class name using the ClassName.EventName syntax.
EventTrigger objects cannot handle events that have already been Handled. Controls such as Button or TextBox perform specific actions on user input events such as mouse clicks and keyboard events. For example, if you are styling a button and try to set the MouseDown event as the RoutedEvent of an EventTrigger, the EventTrigger never gets applied because the event first gets handled by the button. Instead, you can use the PreviewMouseDown event or a different event.
This example shows how to use event triggers in a style to animate the MouseEnter and MouseLeave events of a FrameworkElement. In this example, the Style has the TargetType set to Rectangle. Therefore, there is no need to qualify the MouseEnter and MouseLeave event names with the class name.
<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>
To see the complete sample, see Event Triggers Sample.
|How to: Use Event Triggers to Control a Storyboard After It Starts|| |
This example shows how to control a Storyboard after it starts. To start a Storyboard by using XAML, use BeginStoryboard, which distributes the animations to the objects and properties they animate, and starts the storyboard. If you give BeginStoryboard a name by specifying its Name property, you make it a controllable storyboard. You can then interactively control the storyboard after it starts.
Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter EditionThe Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.