ClockController.SeekAlignedToLastTick Method (TimeSpan, TimeSeekOrigin)


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Seeks the target Clock by the specified amount immediately. If the target clock is stopped, seeking makes it active again.

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

public void SeekAlignedToLastTick(
	TimeSpan offset,
	TimeSeekOrigin origin


Type: System.TimeSpan

The seek offset, measured in the target clock's time. This offset is relative to the clock's BeginTime or Duration, depending on the value of origin.

Type: System.Windows.Media.Animation.TimeSeekOrigin

A value that indicates whether the specified offset is relative to the target clock's BeginTime or Duration.

Seek operations do not take the SpeedRatio or SlipBehavior settings of this clock's timeline into account: the clock is treated as though its timeline has a SpeedRatio of 1 and no SlipBehavior.

SeekAlignedToLastTick aligns the seeked time of the clock with the last clock tick. Values are immediately updated to reflect the changes due to SeekAlignedToLastTick, even though the screen will not reflect these changes until the screen updates.

If the target clock has children, their current time is updated accordingly.

This method changes the clock's CurrentState to Active.

Seeking a storyboard triggers the CurrentGlobalSpeedInvalidated and CurrentStateInvalidated events.

The following example demonstrates both the Seek and SeekAlignedToLastTick methods of a ClockController.

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Data;
using System.Xml;
using System.Configuration;

namespace SDKSample
    /// <summary>
    /// Shows how to interactively control a clock.
    /// </summary>

  public class SeekAlignedToLastTickExample : Page

        private AnimationClock myClock;
        private TextBlock currentTimeIndicator;
        private TextBox seekDestination;
        private TextBlock rectangleWidthIndicator;
        private Rectangle myRectangle;

        public SeekAlignedToLastTickExample()

            this.WindowTitle = "Controlling a Storyboard";
            this.Background = Brushes.White;

            StackPanel myStackPanel = new StackPanel();
            myStackPanel.Margin = new Thickness(20);

            // Create a rectangle.
            myRectangle = new Rectangle();
            myRectangle.Width = 100;
            myRectangle.Height = 20;
            myRectangle.Margin = new Thickness(12,0,0,5);
            myRectangle.Fill = new SolidColorBrush(Color.FromArgb(170, 51, 51, 255));
            myRectangle.HorizontalAlignment = HorizontalAlignment.Left;

            // Create an animation and a storyboard to animate the
            // rectangle.
            DoubleAnimation myDoubleAnimation = 
                new DoubleAnimation(100, 500, new Duration(TimeSpan.FromSeconds(60)));  
            myClock = myDoubleAnimation.CreateClock();
            myRectangle.ApplyAnimationClock(Rectangle.WidthProperty, myClock);

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


            // Create some controls to display the
            // storyboard's current time and the
            // current width of the rectangle.
            StackPanel seekPanel = new StackPanel();
            seekPanel.Margin = new Thickness(10);
            StackPanel aPanel = new StackPanel();
            Label aLabel = new Label();
            aPanel.Orientation = Orientation.Horizontal;
            aLabel.Content = "Current Time: ";
            currentTimeIndicator = new TextBlock();

            aPanel = new StackPanel();
            aPanel.Orientation = Orientation.Horizontal;
            aLabel = new Label();
            aLabel.Content = "Rectangle Width: ";
            rectangleWidthIndicator = new TextBlock();
            rectangleWidthIndicator.Text = myRectangle.Width.ToString(); 

            // Create some controls to enable the
            // user to specify a seek position.

            aPanel = new StackPanel();
            aPanel.Orientation = Orientation.Horizontal;
            aLabel = new Label();
            aLabel.Content = "Seek Offset: " ;
            seekDestination = new TextBox();
            seekDestination.Text = "0";

            Button seekButton = new Button();
            seekButton.Content = "Seek";
            seekButton.Click += new RoutedEventHandler(seekButton_Clicked);
            Button seekAlignedToLastTickButton = new Button();
            seekAlignedToLastTickButton.Content = "Seek Aligned to Last Tick";
            seekAlignedToLastTickButton.Click += new RoutedEventHandler(seekAlignedToLastTickButton_Clicked);


            this.Content = myStackPanel;   

            myClock.CurrentTimeInvalidated += new EventHandler(myClock_CurrentTimeInvalidated);

        // Begins the clock.
        private void beginButton_Clicked(object sender, RoutedEventArgs args)


        // Pauses the clock.
        private void pauseButton_Clicked(object sender, RoutedEventArgs args)


        // Resumes the clock.
        private void resumeButton_Clicked(object sender, RoutedEventArgs args)


        // Advances the clock to its fill period.
        private void skipToFillButton_Clicked(object sender, RoutedEventArgs args)


        // Updates the clock's speed.
        private void setSpeedRatioButton_Clicked(object sender, RoutedEventArgs args)
            // Makes the clock progress three times as fast as normal.
            myClock.Controller.SpeedRatio = 3;        


        // Stops the clock.
        private void stopButton_Clicked(object sender, RoutedEventArgs args)


        // Removes the clock.
        private void removeButton_Clicked(object sender, RoutedEventArgs args)


        private void seekButton_Clicked(object sender, RoutedEventArgs args)
            try {

                // The rectangle width will probably not be at its new
                // value when this call is made, because the 
                // clock probably hasn't ticked yet.
                TimeSpan seekTime = TimeSpan.Parse(seekDestination.Text);
                myClock.Controller.Seek(seekTime, TimeSeekOrigin.BeginTime);
                rectangleWidthIndicator.Text = myRectangle.Width.ToString();

            }catch(FormatException ex)
                MessageBox.Show("Invalid TimeSpan value.");

        private void seekAlignedToLastTickButton_Clicked(object sender, RoutedEventArgs args)

            try {

                // The rectangle width will be at its new
                // value when this call is made, because SeekAlignedToLastTick 
                // operation immediately updates timeline and animation
                // values.        
                TimeSpan seekTime = TimeSpan.Parse(seekDestination.Text);
                myClock.Controller.SeekAlignedToLastTick(seekTime, TimeSeekOrigin.BeginTime);
                rectangleWidthIndicator.Text = myRectangle.Width.ToString();

            }catch(FormatException ex)
                MessageBox.Show("Invalid TimeSpan value.");

        private void myClock_CurrentTimeInvalidated(object sender, EventArgs e)

            currentTimeIndicator.Text = myClock.CurrentTime.ToString();



.NET Framework
Available since 3.0
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