Export (0) Print
Expand All

DiscreteObjectKeyFrame Class

Animates from the Object value of the previous key frame to its own Value using discrete values.

System.Object
  System.Windows.DependencyObject
    System.Windows.Media.Animation.ObjectKeyFrame
      System.Windows.Media.Animation.DiscreteObjectKeyFrame

Namespace:  System.Windows.Media.Animation
Assembly:  System.Windows (in System.Windows.dll)

'Declaration
Public NotInheritable Class DiscreteObjectKeyFrame _
	Inherits ObjectKeyFrame
<DiscreteObjectKeyFrame ...>
  <DiscreteObjectKeyFrame.Value>
    objectValue
  </DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame ...>
-or-
</DiscreteObjectKeyFrame Value="objectAsAttribute"...>

XAML Values

objectValue

An object element that declares the value of the object to use for the key frame.

objectAsAttribute

A string attribute value that can be converted to an object value.

The DiscreteObjectKeyFrame type exposes the following members.

  NameDescription
Public methodSupported by Silverlight for Windows PhoneDiscreteObjectKeyFrameInitializes a new instance of the DiscreteObjectKeyFrame class.
Top

  NameDescription
Public propertySupported by Silverlight for Windows PhoneDispatcherGets the Dispatcher this object is associated with. (Inherited from DependencyObject.)
Public propertySupported by Silverlight for Windows PhoneKeyTimeGets or sets the time at which the key frame's target Value should be reached. (Inherited from ObjectKeyFrame.)
Public propertySupported by Silverlight for Windows PhoneValueGets or sets the key frame's target value. (Inherited from ObjectKeyFrame.)
Top

  NameDescription
Public methodSupported by Silverlight for Windows PhoneCheckAccessDetermines whether the calling thread has access to this object. (Inherited from DependencyObject.)
Public methodSupported by Silverlight for Windows PhoneClearValueClears the local value of a dependency property. (Inherited from DependencyObject.)
Public methodSupported by Silverlight for Windows PhoneEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodSupported by Silverlight for Windows PhoneFinalizeAllows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneGetAnimationBaseValueReturns any base value established for a Silverlight dependency property, which would apply in cases where an animation is not active. (Inherited from DependencyObject.)
Public methodSupported by Silverlight for Windows PhoneGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneGetValueReturns the current effective value of a dependency property from a DependencyObject. (Inherited from DependencyObject.)
Protected methodSupported by Silverlight for Windows PhoneMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneReadLocalValueReturns the local value of a dependency property, if a local value is set. (Inherited from DependencyObject.)
Public methodSupported by Silverlight for Windows PhoneSetValueSets the local value of a dependency property on a DependencyObject. (Inherited from DependencyObject.)
Public methodSupported by Silverlight for Windows PhoneToStringReturns a string that represents the current object. (Inherited from Object.)
Top

This class is used as part of a ObjectKeyFrameCollection in conjunction with a ObjectAnimationUsingKeyFrames to animate an Object property value along a set of key frames.

A key frame defines a segment of the ObjectAnimationUsingKeyFrames to which it belongs. Each key frame has a target Value and a KeyTime. The KeyTime specifies the time at which the key frame's Value should be reached. A key frame animates from the target value of the previous key frame to its own target value. It starts when the previous key frame ends and ends when its own key time is reached.

Discrete key frames like DiscreteObjectKeyFrame create sudden "jumps" between values (no interpolation). In other words, the animated property does not change until the key frame's key time is reached, at which point the animated property goes suddenly to the target value.

The XAML usage shown is the one most likely to be used for real DiscreteObjectKeyFrame scenarios. Value is a property inherited from the ObjectKeyFrame base class, and for other key frame types (like PointKeyFrame) Value is typically given as an attribute. But DiscreteObjectKeyFrame is specifically meant for objects, which sometimes cannot be expressed in attribute form.

Objects that can be expressed in attribute form include any object that has a native conversion behavior. This includes language primitives, or enumeration values. Other objects may require the property element form in order to be specified as a Value.

One particular scenario for DiscreteObjectKeyFrame is for providing visual state property values for controls, when the control properties take enumerated values or values of common primitives such as Int32, Boolean, or String. For more information, see Creating a New Control by Creating a ControlTemplate.

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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

Community Additions

ADD
Show:
© 2014 Microsoft