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LinearThicknessKeyFrame Class

Animates from the Thickness value of the previous key frame to its own Value using linear interpolation.

Namespace:  System.Windows.Media.Animation
Assembly:  PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation
public class LinearThicknessKeyFrame : ThicknessKeyFrame
<LinearThicknessKeyFrame .../>

The LinearThicknessKeyFrame type exposes the following members.

  NameDescription
Public methodLinearThicknessKeyFrame()Initializes a new instance of the LinearThicknessKeyFrame class.
Public methodLinearThicknessKeyFrame(Thickness)Initializes a new instance of the LinearThicknessKeyFrame class with the specified ending value.
Public methodLinearThicknessKeyFrame(Thickness, KeyTime)Initializes a new instance of the LinearThicknessKeyFrame class with the specified ending value and key time.
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  NameDescription
Public propertyCanFreezeGets a value that indicates whether the object can be made unmodifiable. (Inherited from Freezable.)
Public propertyDependencyObjectTypeGets the DependencyObjectType that wraps the CLR type of this instance.  (Inherited from DependencyObject.)
Public propertyDispatcherGets the Dispatcher this DispatcherObject is associated with. (Inherited from DispatcherObject.)
Public propertyIsFrozenGets a value that indicates whether the object is currently modifiable. (Inherited from Freezable.)
Public propertyIsSealedGets a value that indicates whether this instance is currently sealed (read-only). (Inherited from DependencyObject.)
Public propertyKeyTime Gets or sets the time at which the key frame's target Value should be reached. (Inherited from ThicknessKeyFrame.)
Public propertyValue Gets or sets the key frame's target value. (Inherited from ThicknessKeyFrame.)
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  NameDescription
Public methodCheckAccessDetermines whether the calling thread has access to this DispatcherObject. (Inherited from DispatcherObject.)
Public methodClearValue(DependencyProperty)Clears the local value of a property. The property to be cleared is specified by a DependencyProperty identifier. (Inherited from DependencyObject.)
Public methodClearValue(DependencyPropertyKey)Clears the local value of a read-only property. The property to be cleared is specified by a DependencyPropertyKey. (Inherited from DependencyObject.)
Public methodCloneCreates a modifiable clone of the Freezable, making deep copies of the object's values. When copying the object's dependency properties, this method copies expressions (which might no longer resolve) but not animations or their current values. (Inherited from Freezable.)
Protected methodCloneCoreMakes the instance a clone (deep copy) of the specified Freezable using base (non-animated) property values. (Inherited from Freezable.)
Public methodCloneCurrentValueCreates a modifiable clone (deep copy) of the Freezable using its current values. (Inherited from Freezable.)
Protected methodCloneCurrentValueCoreMakes the instance a modifiable clone (deep copy) of the specified Freezable using current property values. (Inherited from Freezable.)
Public methodCoerceValueCoerces the value of the specified dependency property. This is accomplished by invoking any CoerceValueCallback function specified in property metadata for the dependency property as it exists on the calling DependencyObject. (Inherited from DependencyObject.)
Protected methodCreateInstanceInitializes a new instance of the Freezable class. (Inherited from Freezable.)
Protected methodCreateInstanceCoreCreates a new instance of LinearThicknessKeyFrame. (Overrides Freezable.CreateInstanceCore().)
Public methodEqualsDetermines whether a provided DependencyObject is equivalent to the current DependencyObject. (Inherited from DependencyObject.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodFreeze()Makes the current object unmodifiable and sets its IsFrozen property to true. (Inherited from Freezable.)
Protected methodFreezeCoreMakes the Freezable object unmodifiable or tests whether it can be made unmodifiable. (Inherited from Freezable.)
Public methodGetAsFrozenCreates a frozen copy of the Freezable, using base (non-animated) property values. Because the copy is frozen, any frozen sub-objects are copied by reference. (Inherited from Freezable.)
Protected methodGetAsFrozenCoreMakes the instance a frozen clone of the specified Freezable using base (non-animated) property values. (Inherited from Freezable.)
Public methodGetCurrentValueAsFrozenCreates a frozen copy of the Freezable using current property values. Because the copy is frozen, any frozen sub-objects are copied by reference. (Inherited from Freezable.)
Protected methodGetCurrentValueAsFrozenCoreMakes the current instance a frozen clone of the specified Freezable. If the object has animated dependency properties, their current animated values are copied. (Inherited from Freezable.)
Public methodGetHashCodeGets a hash code for this DependencyObject. (Inherited from DependencyObject.)
Public methodGetLocalValueEnumeratorCreates a specialized enumerator for determining which dependency properties have locally set values on this DependencyObject. (Inherited from DependencyObject.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodGetValueReturns the current effective value of a dependency property on this instance of a DependencyObject. (Inherited from DependencyObject.)
Public methodInterpolateValueReturns the interpolated value of a specific key frame at the progress increment provided. (Inherited from ThicknessKeyFrame.)
Protected methodInterpolateValueCoreInterpolates, in a linear fashion, between the previous key frame value and the value of the current key frame, using the supplied progress increment. (Overrides ThicknessKeyFrame.InterpolateValueCore(Thickness, Double).)
Public methodInvalidatePropertyRe-evaluates the effective value for the specified dependency property (Inherited from DependencyObject.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Protected methodOnChangedCalled when the current Freezable object is modified. (Inherited from Freezable.)
Protected methodOnFreezablePropertyChanged(DependencyObject, DependencyObject)Ensures that appropriate context pointers are established for a DependencyObjectType data member that has just been set. (Inherited from Freezable.)
Protected methodOnFreezablePropertyChanged(DependencyObject, DependencyObject, DependencyProperty)This member supports the Windows Presentation Foundation (WPF) infrastructure and is not intended to be used directly from your code. (Inherited from Freezable.)
Protected methodOnPropertyChangedOverrides the DependencyObject implementation of OnPropertyChanged to also invoke any Changed handlers in response to a changing dependency property of type Freezable. (Inherited from Freezable.)
Public methodReadLocalValueReturns the local value of a dependency property, if it exists. (Inherited from DependencyObject.)
Protected methodReadPreambleEnsures that the Freezable is being accessed from a valid thread. Inheritors of Freezable must call this method at the beginning of any API that reads data members that are not dependency properties. (Inherited from Freezable.)
Public methodSetCurrentValueSets the value of a dependency property without changing its value source. (Inherited from DependencyObject.)
Public methodSetValue(DependencyProperty, Object)Sets the local value of a dependency property, specified by its dependency property identifier. (Inherited from DependencyObject.)
Public methodSetValue(DependencyPropertyKey, Object)Sets the local value of a read-only dependency property, specified by the DependencyPropertyKey identifier of the dependency property. (Inherited from DependencyObject.)
Protected methodShouldSerializePropertyReturns a value that indicates whether serialization processes should serialize the value for the provided dependency property. (Inherited from DependencyObject.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
Public methodVerifyAccessEnforces that the calling thread has access to this DispatcherObject. (Inherited from DispatcherObject.)
Protected methodWritePostscriptRaises the Changed event for the Freezable and invokes its OnChanged method. Classes that derive from Freezable should call this method at the end of any API that modifies class members that are not stored as dependency properties. (Inherited from Freezable.)
Protected methodWritePreambleVerifies that the Freezable is not frozen and that it is being accessed from a valid threading context. Freezable inheritors should call this method at the beginning of any API that writes to data members that are not dependency properties. (Inherited from Freezable.)
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  NameDescription
Public eventChangedOccurs when the Freezable or an object it contains is modified. (Inherited from Freezable.)
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  NameDescription
Explicit interface implemetationPrivate propertyIKeyFrame.ValueGets or sets the value associated with a KeyTime instance. (Inherited from ThicknessKeyFrame.)
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This class is used as part of a ThicknessKeyFrameCollection in conjunction with a ThicknessAnimationUsingKeyFrames to animate a Thickness property value along a set of key frames.

A key frame defines a segment of the ThicknessAnimationUsingKeyFrames 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.

Linear key frames like LinearThicknessKeyFrame create a smooth, linear interpolation between values.

This example shows how to animate the BorderThickness property of a Border.

The following example uses the ThicknessAnimationUsingKeyFrames class to animate the BorderThickness property of a Border. This animation uses three key frames in the following manner:

  1. During the first half second, uses an instance of the LinearThicknessKeyFrame class to gradually increase the thickness of the border. The example uses LinearThicknessKeyFrame to create a smooth linear increase between values.

  2. At the end of the next half second, uses an instance of the DiscreteThicknessKeyFrame class to suddenly increase the thickness of the border. Discrete key frames like those derived from DiscreteThicknessKeyFrame create sudden jumps between values, that is, the movement of the animation is jerky.

  3. During the final two seconds, uses an instance of the SplineThicknessKeyFrame class to decrease the thickness of the border. Spline key frames like those derived from SplineThicknessKeyFrame create a variable transition between values according to the values of the KeySpline property. In this key frame, the animation starts off slow and speeds up exponentially toward the end of the time segment.


<!-- This example shows how to use the ThicknessAnimationUsingKeyFrames to create
an animation on the BorderThickness property of a Border. -->
<Page  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  x:Class="Microsoft.Samples.KeyFrameExamples.ThicknessAnimationUsingKeyFramesExample"
  Name="myRootElement"
  WindowTitle="ThicknessAnimationUsingKeyFrames Example">

  <StackPanel Orientation="Vertical" HorizontalAlignment="Center">
    <Border Background="#99FFFFFF" BorderBrush="#CCCCFF" BorderThickness="1"
    Margin="0,60,0,20" Padding="20"  >
      <Border.Triggers>
        <EventTrigger RoutedEvent="Border.Loaded">
          <BeginStoryboard>
            <Storyboard>

              <!-- Animating the BorderThickness property uses 3 KeyFrames. -->
              <ThicknessAnimationUsingKeyFrames
                Storyboard.TargetProperty="BorderThickness"
                Duration="0:0:5" FillBehavior="HoldEnd" RepeatBehavior="Forever">
                <ThicknessAnimationUsingKeyFrames.KeyFrames>

                  <!-- Using a LinearThicknessKeyFrame, thickness increases gradually
                  over the first half second of the animation. -->
                  <LinearThicknessKeyFrame KeyTime="0:0:0.5">
                    <LinearThicknessKeyFrame.Value>
                      <Thickness Left="8" Right="8" Top="6" Bottom="6" />
                    </LinearThicknessKeyFrame.Value>
                  </LinearThicknessKeyFrame>

                  <!-- Using a DiscreteThicknessKeyFrame, thickness increases suddenly
                  after the first second of the animation. -->
                  <DiscreteThicknessKeyFrame KeyTime="0:0:1">
                    <DiscreteThicknessKeyFrame.Value>
                      <Thickness Left="28" Right="28" Top="24" Bottom="24" />
                    </DiscreteThicknessKeyFrame.Value>
                  </DiscreteThicknessKeyFrame>

                  <!-- Using a SplineThicknessKeyFrame, thickness decreases slowly at first
                  and then suddenly contracts. This KeyFrame takes 2 seconds. -->
                  <SplineThicknessKeyFrame KeySpline="0.6,0.0 0.9,0.00" KeyTime="0:0:3">
                    <SplineThicknessKeyFrame.Value>
                      <Thickness Left="1" Right="1" Top="1" Bottom="8" />
                    </SplineThicknessKeyFrame.Value>
                  </SplineThicknessKeyFrame>

                </ThicknessAnimationUsingKeyFrames.KeyFrames>
              </ThicknessAnimationUsingKeyFrames>
            </Storyboard>
          </BeginStoryboard>
        </EventTrigger>
      </Border.Triggers>

      <TextBlock>
        This example shows how to use the ThicknessAnimationUsingKeyFrames to create
        an animation on the BorderThickness property of a Border. 
      </TextBlock>
    </Border>

  </StackPanel>
</Page>


For the complete sample, see KeyFrame Animation Sample.

.NET Framework

Supported in: 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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