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Storyboard.Begin Method (FrameworkContentElement, HandoffBehavior, Boolean)

Applies the animations associated with this Storyboard to their targets and initiates them, using the specified HandoffBehavior.

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

public void Begin(
	FrameworkContentElement containingObject,
	HandoffBehavior handoffBehavior,
	bool isControllable
)

Parameters

containingObject
Type: System.Windows.FrameworkContentElement

An object contained within the same name scope as the targets of this storyboard's animations. Animations without a specified TargetName are applied to containingObject.

handoffBehavior
Type: System.Windows.Media.Animation.HandoffBehavior

The behavior the new animation should use to interact with any current animations.

isControllable
Type: System.Boolean

Declares whether the animation is controllable (can be paused) once started.

If the targeted properties are already animated, they are replaced using the specified handoff behavior.

To interactively control this storyboard, you must specify the same containingObject when calling the interactive methods that you used to begin the storyboard

When this method is called, Clock objects are created for the storyboard and any timelines it contains. These clocks are stored with containingObject.

Beginning a storyboard triggers the CurrentStateInvalidated and CurrentGlobalSpeedInvalidated events.

Using the Compose HandoffBehavior

When you apply a Storyboard, AnimationTimeline, or AnimationClock to a property using the Compose HandoffBehavior, any Clock objects previously associated with that property continue to consume system resources; the timing system does not remove these clocks automatically.

To avoid performance issues when you apply a large number of clocks using Compose, you should remove composing clocks from the animated property after they complete. There are several ways to remove a clock.

This is primarily an issue for animations on objects that have a long lifetime. When an object is garbage collected, its clocks are also disconnected and garbage collected.

For more information about clock objects, see Animation and Timing System Overview.

The following example uses a controllable storyboard to animate a TextEffect. The TextEffect is contained within a FrameworkContentElement's name scope.

/*
    This example shows how to control
    a storyboard after it has started.

*/ 

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Shapes;
using System.Windows.Media.Animation;
using System.Windows.Documents;


namespace Microsoft.Samples.Animation.AnimatingWithStoryboards
{
    public class FrameworkContentElementControlStoryboardExample : FlowDocument
    {

        private Storyboard myStoryboard;

        public FrameworkContentElementControlStoryboardExample()
        {

            // Create a name scope for the document.
            NameScope.SetNameScope(this, new NameScope());        
            this.Background = Brushes.White;

            // Create a run of text.
            Run theText = new Run( 
                "Lorem ipsum dolor sit amet, consectetuer adipiscing elit." + 
                "Ut non lacus. Nullam a ligula id leo adipiscing ornare." +
                " Duis mattis. ");   

            // Create a TextEffect
            TextEffect animatedSpecialEffect = new TextEffect();
            animatedSpecialEffect.Foreground = Brushes.OrangeRed;
            animatedSpecialEffect.PositionStart = 0;
            animatedSpecialEffect.PositionCount = 0;

            // Assign the TextEffect a name by  
            // registering it with the page, so that 
            // it can be targeted by storyboard 
            // animations             
            this.RegisterName("animatedSpecialEffect", animatedSpecialEffect);  

            // Apply the text effect to the run.
            theText.TextEffects = new TextEffectCollection();
            theText.TextEffects.Add(animatedSpecialEffect);

            // Create a paragraph to contain the run.
            Paragraph animatedParagraph = new Paragraph(theText);
            animatedParagraph.Background = Brushes.LightGray;
            animatedParagraph.Padding = new Thickness(20);

            this.Blocks.Add(animatedParagraph);            
            BlockUIContainer controlsContainer = new BlockUIContainer();                

            // 
            // Create an animation and a storyboard to animate the 
            // text effect. 
            //
            Int32Animation countAnimation = 
                new Int32Animation(0, 127, TimeSpan.FromSeconds(10)); 
            Storyboard.SetTargetName(countAnimation, "animatedSpecialEffect");
            Storyboard.SetTargetProperty(countAnimation, 
                new PropertyPath(TextEffect.PositionCountProperty));
            myStoryboard = new Storyboard();
            myStoryboard.Children.Add(countAnimation);

            // 
            // Create some buttons to control the storyboard 
            // and a panel to contain them. 
            //
            StackPanel buttonPanel = new StackPanel();
            buttonPanel.Orientation = Orientation.Vertical;
            Button beginButton = new Button();
            beginButton.Content = "Begin";
            beginButton.Click += new RoutedEventHandler(beginButton_Clicked);            
            buttonPanel.Children.Add(beginButton);
            Button pauseButton = new Button();
            pauseButton.Content = "Pause";
            pauseButton.Click +=new RoutedEventHandler(pauseButton_Clicked);
            buttonPanel.Children.Add(pauseButton);
            Button resumeButton = new Button();
            resumeButton.Content = "Resume";
            resumeButton.Click +=new RoutedEventHandler(resumeButton_Clicked);
            buttonPanel.Children.Add(resumeButton);
            Button skipToFillButton = new Button();
            skipToFillButton.Content = "Skip to Fill";
            skipToFillButton.Click +=new RoutedEventHandler(skipToFillButton_Clicked);
            buttonPanel.Children.Add(skipToFillButton);
            Button setSpeedRatioButton = new Button();
            setSpeedRatioButton.Content = "Triple Speed";
            setSpeedRatioButton.Click +=new RoutedEventHandler(setSpeedRatioButton_Clicked);
            buttonPanel.Children.Add(setSpeedRatioButton);
            Button stopButton = new Button();
            stopButton.Content = "Stop";
            stopButton.Click +=new RoutedEventHandler(stopButton_Clicked);
            buttonPanel.Children.Add(stopButton);
            Button removeButton = new Button();
            removeButton.Content = "Remove";
            removeButton.Click +=new RoutedEventHandler(removeButton_Clicked);
            buttonPanel.Children.Add(removeButton); 

            controlsContainer.Child = buttonPanel; 
            this.Blocks.Add(controlsContainer);

        }

        // Begins the storyboard. 
        private void beginButton_Clicked(object sender, RoutedEventArgs args)
        {
            // Specifying "true" as the second Begin parameter
            // makes this storyboard controllable.
            myStoryboard.Begin(this, true);          

        }

        // Pauses the storyboard. 
        private void pauseButton_Clicked(object sender, RoutedEventArgs args)
        {
             myStoryboard.Pause(this);          

        }

        // Resumes the storyboard. 
        private void resumeButton_Clicked(object sender, RoutedEventArgs args)
        {
             myStoryboard.Resume(this);          

        }     

        // Advances the storyboard to its fill period. 
        private void skipToFillButton_Clicked(object sender, RoutedEventArgs args)
        {
             myStoryboard.SkipToFill(this);          

        } 

        // Updates the storyboard's speed. 
        private void setSpeedRatioButton_Clicked(object sender, RoutedEventArgs args)
        {
            // Makes the storyboard progress three times as fast as normal.
            myStoryboard.SetSpeedRatio(this, 3);          

        }           

        // Stops the storyboard. 
        private void stopButton_Clicked(object sender, RoutedEventArgs args)
        {
             myStoryboard.Stop(this);          

        }     

        // Removes the storyboard. 
        private void removeButton_Clicked(object sender, RoutedEventArgs args)
        {
             myStoryboard.Remove(this);          

        }           

    }
}

The next example uses the SnapshotAndReplace HandoffBehavior to animate when the user left-clicks, and the Compose HandoffBehavior when the user right-clicks.

/*
    This example shows how to animate
    a FrameworkContentElement with a storyboard.

*/ 

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Shapes;
using System.Windows.Media.Animation;
using System.Windows.Documents;
using System.Windows.Input;


namespace Microsoft.Samples.Animation.AnimatingWithStoryboards
{
    public class FrameworkContentElementStoryboardWithHandoffBehaviorExample : 
        FlowDocument
    {

        private Storyboard myStoryboard;
        DoubleAnimation xAnimation;
        DoubleAnimation yAnimation;

        public FrameworkContentElementStoryboardWithHandoffBehaviorExample()
        {

            // Create a name scope for the document.
            NameScope.SetNameScope(this, new NameScope());        
            this.Background = Brushes.Orange;

            // Create a run of text.
            Run theText = new Run( 
                "Lorem ipsum dolor sit amet, consectetuer adipiscing elit.");   

            // Create a TextEffect
            TextEffect animatedSpecialEffect = new TextEffect();
            animatedSpecialEffect.Foreground = Brushes.OrangeRed;
            animatedSpecialEffect.PositionStart = 0;
            animatedSpecialEffect.PositionCount = 20;

            TranslateTransform animatedTransform = 
                new TranslateTransform();

            // Assign the transform a name by  
            // registering it with the page, so that 
            // it can be targeted by storyboard 
            // animations.       
            this.RegisterName("animatedTransform", animatedTransform);             
            animatedSpecialEffect.Transform = animatedTransform;


            // Apply the text effect to the run.
            theText.TextEffects = new TextEffectCollection();
            theText.TextEffects.Add(animatedSpecialEffect);


            // Create a paragraph to contain the run.
            Paragraph animatedParagraph = new Paragraph(theText);
            animatedParagraph.Background = Brushes.LightGray;           

            this.Blocks.Add(animatedParagraph);                           

            // 
            // Create a storyboard to animate the 
            // text effect's transform. 
            //
            myStoryboard = new Storyboard();

            xAnimation = new DoubleAnimation();  
            xAnimation.Duration = TimeSpan.FromSeconds(5);                        
            Storyboard.SetTargetName(xAnimation, "animatedTransform");
            Storyboard.SetTargetProperty(xAnimation, 
                new PropertyPath(TranslateTransform.XProperty));      
            myStoryboard.Children.Add(xAnimation);

            yAnimation = new DoubleAnimation();
            yAnimation.Duration = TimeSpan.FromSeconds(5);           
            Storyboard.SetTargetName(yAnimation, "animatedTransform");
            Storyboard.SetTargetProperty(yAnimation, 
                new PropertyPath(TranslateTransform.YProperty));      
            myStoryboard.Children.Add(yAnimation);            

            this.MouseLeftButtonDown += 
                new MouseButtonEventHandler(document_mouseLeftButtonDown);
            this.MouseRightButtonDown += 
                new MouseButtonEventHandler(document_mouseRightButtonDown);

        }



        // When the user left-clicks, use the  
        // SnapshotAndReplace HandoffBehavior when applying the animation.         
        private void document_mouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {

            Point clickPoint = Mouse.GetPosition(this);


            // Animate to the target point.
            xAnimation.To = clickPoint.X; 
            yAnimation.To = clickPoint.Y;

            try
            {
                myStoryboard.Begin(this, HandoffBehavior.SnapshotAndReplace);  

            }catch(Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }

        // When the user right-clicks, use the  
        // Compose HandoffBehavior when applying the animation. 
        private void document_mouseRightButtonDown(object sender, MouseButtonEventArgs e)
        {


            Point clickPoint = Mouse.GetPosition(this);

            // Animate to the target point.
            xAnimation.To = clickPoint.X;
            yAnimation.To = clickPoint.Y;
            myStoryboard.Begin(this, HandoffBehavior.Compose);  


        }        





    }
}

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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