ColorAnimation ColorAnimation ColorAnimation Class

Definition

Animates the value of a Color property between two target values using linear interpolation over a specified Duration.

public : sealed class ColorAnimation : Timeline, IColorAnimation
public sealed class ColorAnimation : Timeline, IColorAnimation
Public NotInheritable Class ColorAnimation Inherits Timeline Implements IColorAnimation
<ColorAnimation .../>
Inheritance
Attributes
Windows 10 requirements
Device family
Windows 10 (introduced v10.0.10240.0)
API contract
Windows.Foundation.UniversalApiContract (introduced v1)

Examples

The following example shows how to use ColorAnimation to animate the background color of a StackPanel.

<StackPanel x:Name="myStackPanel" Background="Red"
  Loaded="Start_Animation">
  <StackPanel.Resources>
    <Storyboard x:Name="colorStoryboard">

      <!-- Animate the background color of the canvas from red to green
        over 4 seconds. -->
      <ColorAnimation Storyboard.TargetName="myStackPanel" 
        Storyboard.TargetProperty="(Panel.Background).(SolidColorBrush.Color)"
        From="Red" To="Blue" Duration="0:0:4"/>

    </Storyboard>
  </StackPanel.Resources>
</StackPanel>
<StackPanel x:Name="myStackPanel" Background="Red"
Loaded="Start_Animation">
    <StackPanel.Resources>
        <Storyboard x:Name="colorStoryboard">

            <ColorAnimationUsingKeyFrames Storyboard.TargetName="myStackPanel" 
      Storyboard.TargetProperty="(Panel.Background).(SolidColorBrush.Color)">
                
                <!-- Go from green to red in the first 2 seconds. LinearColorKeyFrame creates
                a smooth, linear animation between values. -->
                <LinearColorKeyFrame Value="Blue" KeyTime="00:00:02" />

                <!-- In the next half second, go to yellow. DiscreteColorKeyFrame creates a 
                sudden jump between values. -->
                <DiscreteColorKeyFrame Value="Yellow" KeyTime="00:00:2.5" />

                <!-- In the final 2 seconds of the animation, go from yellow back to green. SplineColorKeyFrame 
                creates a variable transition between values depending on the KeySpline property. In this example,
                the animation starts off slow but toward the end of the time segment, it speeds up exponentially.-->
                <SplineColorKeyFrame Value="Green" KeyTime="00:00:4.5" KeySpline="0.6,0.0 0.9,0.00" />

            </ColorAnimationUsingKeyFrames>
        </Storyboard>
    </StackPanel.Resources>
</StackPanel>
<StackPanel Loaded="Start_Animation">
  <StackPanel.Resources>
    <Storyboard x:Name="colorStoryboard">
      <!-- Animate the background color of the canvas from red to green
        over 4 seconds. -->
      <ColorAnimation Storyboard.TargetName="mySolidColorBrush"
        Storyboard.TargetProperty="Color" From="Red" To="Blue" Duration="0:0:4"/>
    </Storyboard>
  </StackPanel.Resources>

  <StackPanel.Background>
    <SolidColorBrush x:Name="mySolidColorBrush" Color="Red" />
  </StackPanel.Background>

</StackPanel>
// Start the animation when the object loads.
private void Start_Animation(object sender, RoutedEventArgs e)
{
    colorStoryboard.Begin();
}
' Start the animation when the object loads
Private Sub Start_Animation(ByVal sender As Object, ByVal e As EventArgs)
    colorStoryboard.Begin()
End Sub
Storyboard.TargetProperty="(Panel.Background).(SolidColorBrush.Color)"

Alternatively, you could explicitly create the SolidColorBrush, name it, and target its Color property directly. The example below shows how to create the same animation as the previous one except it uses direct property targeting.

<StackPanel Loaded="Start_Animation">
  <StackPanel.Resources>
    <Storyboard x:Name="colorStoryboard">
      <!-- Animate the background color of the canvas from red to green
        over 4 seconds. -->
      <ColorAnimation Storyboard.TargetName="mySolidColorBrush"
        Storyboard.TargetProperty="Color" From="Red" To="Blue" Duration="0:0:4"/>
    </Storyboard>
  </StackPanel.Resources>

  <StackPanel.Background>
    <SolidColorBrush x:Name="mySolidColorBrush" Color="Red" />
  </StackPanel.Background>

</StackPanel>
// Start the animation when the object loads.
private void Start_Animation(object sender, RoutedEventArgs e)
{
    colorStoryboard.Begin();
}
' Start the animation when the object loads
Private Sub Start_Animation(ByVal sender As Object, ByVal e As EventArgs)
    colorStoryboard.Begin()
End Sub

Remarks

Use ColorAnimation to animate the property value of any dependency property that is of type Color.

Linear interpolation for a Color means that each of the ARGB values is treated as a byte and the interpolation is simply a mathematical operation. You get best results from color interpolation if at least one of the RGB components is the same or close to the same in both the starting value and ending value.

You usually need to use indirect property targeting in order to target a sub-property of another object that's the value of a property on the target. This is because very few properties that display color information in UI elements are actually of type Color. Most are instead of type Brush. To use ColorAnimation on UI elements, you typically are targeting the Color property of a SolidColorBrush that's the sub-property value. Syntax for this is shown in the XAML example in the "Examples" section. For more info on indirect property targeting and other storyboarded animation concepts, see Storyboarded animations or Property-path syntax.

A ColorAnimation typically has at least one of the From, By or To properties set, but never all three.

  • From only: The animation progresses from the value specified by the From property to the base value of the property being animated.
  • From and To: The animation progresses from the value specified by the From property to the value specified by the To property.
  • From and By: The animation progresses from the value specified by the From property to the value specified by the sum of the From and By properties.
  • To only: The animation progresses from the animated property's base value or a previous animation's output value to the value specified by the To property.
  • By only: The animation progresses from the base value of the property being animated or a previous animation's output value to the sum of that value and the value specified by the By property.

The From, By and To properties of a ColorAnimation aren't strictly a Color. Instead these are a Nullable for Color. The default value for these is null, not an uninitialized structure. That null value is how the animation system distinguishes that you haven't specifically set a value. Visual C++ component extensions (C++/CX) doesn't have a Nullable type, so it uses IReference instead.

Constructors

ColorAnimation() ColorAnimation() ColorAnimation()

Initializes a new instance of the ColorAnimation class.

public : ColorAnimation()
public ColorAnimation()
Public Sub New()

Properties

AllowDependentAnimations AllowDependentAnimations AllowDependentAnimations

Gets or sets a value that determines whether dependent animations should be permitted to run, throughout the app.

(Inherited from Timeline)

AutoReverse AutoReverse AutoReverse

Gets or sets a value that indicates whether the timeline plays in reverse after it completes a forward iteration.

(Inherited from Timeline)

AutoReverseProperty AutoReverseProperty AutoReverseProperty

Identifies the AutoReverse dependency property.

(Inherited from Timeline)

BeginTime BeginTime BeginTime

Gets or sets the time at which this Timeline should begin.

(Inherited from Timeline)

BeginTimeProperty BeginTimeProperty BeginTimeProperty

Identifies the BeginTime dependency property.

(Inherited from Timeline)

By By By

Gets or sets the total amount by which the animation changes its starting value.

public : IReference<Color> By { get; set; }
public Nullable<Color> By { get; set; }
Public ReadWrite Property By As Nullable<Color>
<ColorAnimation By="colorString"/>
-or-
<ColorAnimation By="referenceToColor"/>
Value
IReference<Color> Nullable<Color> Nullable<Color>

The total amount by which the animation changes its starting value. The default is null.

If you are programming using C# or Visual Basic, the type of this property is projected as Color?(a nullable Color ).

ByProperty ByProperty ByProperty

Identifies the By dependency property.

public : static DependencyProperty ByProperty { get; }
public static DependencyProperty ByProperty { get; }
Public Static ReadOnly Property ByProperty As DependencyProperty
Value
DependencyProperty DependencyProperty DependencyProperty

The identifier for the By dependency property.

Dispatcher Dispatcher Dispatcher

Gets the CoreDispatcher that this object is associated with. The CoreDispatcher represents a facility that can access the DependencyObject on the UI thread even if the code is initiated by a non-UI thread.

(Inherited from DependencyObject)

Duration Duration Duration

Gets or sets the length of time for which this timeline plays, not counting repetitions.

(Inherited from Timeline)

DurationProperty DurationProperty DurationProperty

Identifies the Duration dependency property.

(Inherited from Timeline)

EasingFunction EasingFunction EasingFunction

Gets or sets the easing function applied to this animation.

public : EasingFunctionBase EasingFunction { get; set; }
public EasingFunctionBase EasingFunction { get; set; }
Public ReadWrite Property EasingFunction As EasingFunctionBase
<ColorAnimation>
  <ColorAnimation.EasingFunction>
    singleEasingFunction
  </ColorAnimation.EasingFunction>
</ColorAnimation>

Value
EasingFunctionBase EasingFunctionBase EasingFunctionBase

The easing function applied to this animation.

Remarks

Easing functions allow you to apply custom mathematical formulas to your animations. Mathematical operations are often useful to produce animations that simulate real-world physics in a 2-D coordinate system. For example, you may want an object to realistically bounce or behave as though it were on a spring. For a list of easing functions and info on how to use them, see Key-frame animations and easing function animations.

See Also

EasingFunctionProperty EasingFunctionProperty EasingFunctionProperty

Identifies the EasingFunction dependency property.

public : static DependencyProperty EasingFunctionProperty { get; }
public static DependencyProperty EasingFunctionProperty { get; }
Public Static ReadOnly Property EasingFunctionProperty As DependencyProperty
Value
DependencyProperty DependencyProperty DependencyProperty

The identifier for the EasingFunction dependency property.

EnableDependentAnimation EnableDependentAnimation EnableDependentAnimation

Gets or sets a value that declares whether animated properties that are considered dependent animations should be permitted to use this animation declaration.

public : Platform::Boolean EnableDependentAnimation { get; set; }
public bool EnableDependentAnimation { get; set; }
Public ReadWrite Property EnableDependentAnimation As bool
<ColorAnimation EnableDependentAnimation="bool" />
Value
Platform::Boolean bool bool

true if the animation can be used for a dependent animation case. false if the animation cannot be used for a dependent animation case. The default is false.

Remarks

What's considered a dependent animation?

Not all custom animations you create can run by default in a Windows Runtime app, if the animation system determines that the animation might cause bad performance in your UI. Animations where the system determines there could be a performance impact are called dependent animations. It's dependent because your animation is actively and frequently updating objects on the UI thread, which is also where current user input and other programmatic updates are making runtime changes to UI.

A dependent animation that's consuming extensive system resources on the UI thread can make the app appear unresponsive in certain situations. If your animation causes a layout change or otherwise has the potential to impact performance on the UI thread, you often need to explicitly enable the animation to see it run. That's what the EnableDependentAnimation property on specific animation classes is for. Use this property with caution, because setting it to true means you are deliberately acknowledging that the animation might slow down other operations on the UI thread when it runs.

For more info, see Storyboarded animations. That topic includes a list of the criteria for an independent animation. An animation is a dependent animation if it doesn't satisfy at least one of those criteria. For the specific property you intend to animate, and for the specifics of your animation, compare your intended animation to the criteria to see whether it would be considered dependent or independent by the system.

Another way to discover whether your animations are dependent is that you might receive a warning from your XAML design surface or tool after you compose that animation, and the warning indicates that you'll need to set EnableDependentAnimation to true to see your animation run.

As an app developer, you can also choose to apply an app-wide setting that always disables dependent animations, even those where EnableDependentAnimation is true. See Timeline.AllowDependentAnimations. This is useful to you as an app developer if you're consuming controls where the templates have dependent animations, and you've identified that as a performance problem, but you don't want to have to retemplate the whole control to turn those animations off.

See Also

EnableDependentAnimationProperty EnableDependentAnimationProperty EnableDependentAnimationProperty

Identifies the EnableDependentAnimation dependency property.

public : static DependencyProperty EnableDependentAnimationProperty { get; }
public static DependencyProperty EnableDependentAnimationProperty { get; }
Public Static ReadOnly Property EnableDependentAnimationProperty As DependencyProperty
Value
DependencyProperty DependencyProperty DependencyProperty

The identifier for the EnableDependentAnimation dependency property.

FillBehavior FillBehavior FillBehavior

Gets or sets a value that specifies how the animation behaves after it reaches the end of its active period.

(Inherited from Timeline)

FillBehaviorProperty FillBehaviorProperty FillBehaviorProperty

Identifies the FillBehavior dependency property.

(Inherited from Timeline)

From From From

Gets or sets the animation's starting value.

public : IReference<Color> From { get; set; }
public Nullable<Color> From { get; set; }
Public ReadWrite Property From As Nullable<Color>
<ColorAnimation From="colorString"/>
-or-
<ColorAnimation From="referenceToColor"/>

Value
IReference<Color> Nullable<Color> Nullable<Color>

The starting value of the animation. The default is null.

If you are programming using C# or Visual Basic, the type of this property is projected as Color?(a nullable Color ).

FromProperty FromProperty FromProperty

Identifies the From dependency property.

public : static DependencyProperty FromProperty { get; }
public static DependencyProperty FromProperty { get; }
Public Static ReadOnly Property FromProperty As DependencyProperty
Value
DependencyProperty DependencyProperty DependencyProperty

The identifier for the From dependency property.

RepeatBehavior RepeatBehavior RepeatBehavior

Gets or sets the repeating behavior of this timeline.

(Inherited from Timeline)

RepeatBehaviorProperty RepeatBehaviorProperty RepeatBehaviorProperty

Identifies the RepeatBehavior dependency property.

(Inherited from Timeline)

SpeedRatio SpeedRatio SpeedRatio

Gets or sets the rate, relative to its parent, at which time progresses for this Timeline.

(Inherited from Timeline)

SpeedRatioProperty SpeedRatioProperty SpeedRatioProperty

Identifies for the SpeedRatio dependency property.

(Inherited from Timeline)

To To To

Gets or sets the animation's ending value.

public : IReference<Color> To { get; set; }
public Nullable<Color> To { get; set; }
Public ReadWrite Property To As Nullable<Color>
<ColorAnimation To="colorString"/>
-or-
<ColorAnimation To="referenceToColor"/>

Value
IReference<Color> Nullable<Color> Nullable<Color>

The ending value of the animation. The default is null.

If you are programming using C# or Visual Basic, the type of this property is projected as Color?(a nullable Color ).

ToProperty ToProperty ToProperty

Identifies the To dependency property.

public : static DependencyProperty ToProperty { get; }
public static DependencyProperty ToProperty { get; }
Public Static ReadOnly Property ToProperty As DependencyProperty
Value
DependencyProperty DependencyProperty DependencyProperty

The identifier for the To dependency property.

Methods

ClearValue(DependencyProperty) ClearValue(DependencyProperty) ClearValue(DependencyProperty)

Clears the local value of a dependency property.

(Inherited from DependencyObject)

GetAnimationBaseValue(DependencyProperty) GetAnimationBaseValue(DependencyProperty) GetAnimationBaseValue(DependencyProperty)

Returns any base value established for a dependency property, which would apply in cases where an animation is not active.

(Inherited from DependencyObject)

GetValue(DependencyProperty) GetValue(DependencyProperty) GetValue(DependencyProperty)

Returns the current effective value of a dependency property from a DependencyObject.

(Inherited from DependencyObject)

ReadLocalValue(DependencyProperty) ReadLocalValue(DependencyProperty) ReadLocalValue(DependencyProperty)

Returns the local value of a dependency property, if a local value is set.

(Inherited from DependencyObject)

RegisterPropertyChangedCallback(DependencyProperty,DependencyPropertyChangedCallback) RegisterPropertyChangedCallback(DependencyProperty,DependencyPropertyChangedCallback) RegisterPropertyChangedCallback(DependencyProperty,DependencyPropertyChangedCallback)

Registers a notification function for listening to changes to a specific DependencyProperty on this DependencyObject instance.

(Inherited from DependencyObject)

SetValue(DependencyProperty,Object) SetValue(DependencyProperty,Object) SetValue(DependencyProperty,Object)

Sets the local value of a dependency property on a DependencyObject.

(Inherited from DependencyObject)

UnregisterPropertyChangedCallback(DependencyProperty,Int64) UnregisterPropertyChangedCallback(DependencyProperty,Int64) UnregisterPropertyChangedCallback(DependencyProperty,Int64)

Cancels a change notification that was previously registered by calling RegisterPropertyChangedCallback.

(Inherited from DependencyObject)

Events

Completed Completed Completed

Occurs when the Storyboard object has completed playing.

(Inherited from Timeline)

See Also