How to: Seek a Clock Synchronously
Use the SeekAlignedToLastTick method to seek a clock to a specific point synchronously. The following example demonstrates both the Seek and SeekAlignedToLastTick methods of a ClockController.
This example shows how to seek a Clock; for an example showing how to seek a storyboard, see How to: Seek a Storyboard Synchronously .
Example
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;
myStackPanel.Children.Add(myRectangle);
//
// 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);
myClock.Controller.Stop();
//
// 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);
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);
myStackPanel.Children.Add(buttonPanel);
// 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: ";
aPanel.Children.Add(aLabel);
currentTimeIndicator = new TextBlock();
aPanel.Children.Add(currentTimeIndicator);
seekPanel.Children.Add(aPanel);
aPanel = new StackPanel();
aPanel.Orientation = Orientation.Horizontal;
aLabel = new Label();
aLabel.Content = "Rectangle Width: ";
aPanel.Children.Add(aLabel);
rectangleWidthIndicator = new TextBlock();
rectangleWidthIndicator.Text = myRectangle.Width.ToString();
aPanel.Children.Add(rectangleWidthIndicator);
seekPanel.Children.Add(aPanel);
// 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: " ;
aPanel.Children.Add(aLabel);
seekDestination = new TextBox();
seekDestination.Text = "0";
aPanel.Children.Add(seekDestination);
seekPanel.Children.Add(aPanel);
Button seekButton = new Button();
seekButton.Content = "Seek";
seekButton.Click += new RoutedEventHandler(seekButton_Clicked);
seekPanel.Children.Add(seekButton);
Button seekAlignedToLastTickButton = new Button();
seekAlignedToLastTickButton.Content = "Seek Aligned to Last Tick";
seekAlignedToLastTickButton.Click += new RoutedEventHandler(seekAlignedToLastTickButton_Clicked);
seekPanel.Children.Add(seekAlignedToLastTickButton);
myStackPanel.Children.Add(seekPanel);
this.Content = myStackPanel;
myClock.CurrentTimeInvalidated += new EventHandler(myClock_CurrentTimeInvalidated);
}
// Begins the clock.
private void beginButton_Clicked(object sender, RoutedEventArgs args)
{
myClock.Controller.Begin();
}
// Pauses the clock.
private void pauseButton_Clicked(object sender, RoutedEventArgs args)
{
myClock.Controller.Pause();
}
// Resumes the clock.
private void resumeButton_Clicked(object sender, RoutedEventArgs args)
{
myClock.Controller.Resume();
}
// Advances the clock to its fill period.
private void skipToFillButton_Clicked(object sender, RoutedEventArgs args)
{
myClock.Controller.SkipToFill();
}
// 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)
{
myClock.Controller.Stop();
}
// Removes the clock.
private void removeButton_Clicked(object sender, RoutedEventArgs args)
{
myClock.Controller.Remove();
}
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.");
seekDestination.Focus();
}
}
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.");
seekDestination.Focus();
}
}
private void myClock_CurrentTimeInvalidated(object sender, EventArgs e)
{
currentTimeIndicator.Text = myClock.CurrentTime.ToString();
}
}
}