EN
Ce contenu n’est pas disponible dans votre langue. Voici la version anglaise.
Ce sujet n'a pas encore été évalué - Évaluez ce sujet

TimelineMarker Class

April 12, 2014

Represents metadata associated with a specific point in a media file.

System.Object
  System.Windows.DependencyObject
    System.Windows.Media.TimelineMarker

Namespace:  System.Windows.Media
Assembly:  System.Windows (in System.Windows.dll)
public sealed class TimelineMarker : DependencyObject

The TimelineMarker type exposes the following members.

  NameDescription
Public methodTimelineMarkerInitializes a new instance of the TimelineMarker class.
Top
  NameDescription
Public propertyDispatcherGets the Dispatcher this object is associated with. (Inherited from DependencyObject.)
Public propertyTextGets or sets the text value of a TimelineMarker.
Public propertyTimeGets or sets the time at which a TimelineMarker is reached.
Public propertyTypeGets or sets the marker type of a TimelineMarker.
Top
  NameDescription
Public methodCheckAccessDetermines whether the calling thread has access to this object. (Inherited from DependencyObject.)
Public methodClearValueClears the local value of a dependency property. (Inherited from DependencyObject.)
Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetAnimationBaseValueReturns any base value established for a Windows Phone dependency property, which would apply in cases where an animation is not active. (Inherited from DependencyObject.)
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodGetValueReturns the current effective value of a dependency property from a DependencyObject. (Inherited from DependencyObject.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodReadLocalValueReturns the local value of a dependency property, if a local value is set. (Inherited from DependencyObject.)
Public methodSetValueSets the local value of a dependency property on a DependencyObject. (Inherited from DependencyObject.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
Top
  NameDescription
Public fieldStatic memberTextPropertyIdentifies the Text dependency property.
Public fieldStatic memberTimePropertyIdentifies the Time dependency property.
Public fieldStatic memberTypePropertyIdentifies the Type dependency property.
Top

A timeline marker is metadata associated with a particular point in a media file. These markers are usually created ahead of time and stored in the media file itself. They are typically used to name different scenes in a video or provide scripting cues. By handling the MediaElement object's MarkerReached event or by accessing the MediaElement object's Markers property, you can use timeline markers to trigger actions or enable users to seek to selected positions in the media file.

TimelineMarker objects are used to represent all types of Windows Media technology timeline markers: markers and script commands (both metadata and separate stream). The following table lists how the Text and Type properties map to their source marker or script command.

TimelineMarker property

Windows Media marker

Windows Media script command

Text

"Name" field

"Param" field

Type

Always set to Name

"Type" field

The following example creates a MediaElement object and responds to its MarkerReached event. Each time a timeline marker is reached, the example displays the timeline marker's Time, Type, and Text values.


<StackPanel Margin="40">
  <StackPanel Orientation="Horizontal">
    <TextBlock FontSize="12" Foreground="DarkGray">Time:</TextBlock>
      <TextBlock x:Name="timeTextBlock" FontSize="12" />   
  </StackPanel>
  <StackPanel Orientation="Horizontal">
    <TextBlock FontSize="12" Foreground="DarkGray">Type:</TextBlock>
    <TextBlock x:Name="typeTextBlock" FontSize="12" />
  </StackPanel>
  <StackPanel Orientation="Horizontal">
    <TextBlock FontSize="12" Foreground="DarkGray">Value:</TextBlock>
    <TextBlock x:Name="valueTextBlock" FontSize="12" />
  </StackPanel>

  <!-- The MediaElement has the MarkerReached event attached. -->
  <MediaElement MarkerReached="OnMarkerReached" HorizontalAlignment="Left"
   Source="thebutterflyandthebear.wmv" Width="300" Height="200" />

</StackPanel>



private void OnMarkerReached(object sender, TimelineMarkerRoutedEventArgs e)
{
    timeTextBlock.Text = e.Marker.Time.Seconds.ToString();
    typeTextBlock.Text = e.Marker.Type.ToString();
    valueTextBlock.Text = e.Marker.Text.ToString();
}


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Cela vous a-t-il été utile ?
(1500 caractères restants)
Merci pour vos suggestions.
Afficher:
© 2014 Microsoft. Tous droits réservés.