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Key to understanding templating is discovering a little bit about how WPF and Silverlight work under the hood. The logical tree is, typically, made up of the XAML elements you edit day-to-day. Admittedly, there are often implied objects that do some work behind the scenes that you can safely omit, but what you create as XAML can be said to constitute the logical tree. Listing 2 27 gives an example.

The animation player shown in Figure 15-3 still lacks one feature that s common in most media players the ability to determine your current position. To make it a bit fancier, you can add some text that shows the time offset and a progress bar that provides a visual indication of how far you are in the animation. Figure 15-4 shows a revised animation player with both details (along with the Slider for controlling speed that was explained in the previous section).

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Adding these details is fairly straightforward. First you need a TextBlock element to show the time and a ProgressBar control to show the graphical bar. You might assume you could set the TextBlock value and the ProgressBar content using a data binding expression, but this isn t possible. That s because the only way to retrieve the information about the current animation clock from the Storyboard is to use methods such as GetCurrentTime() and GetCurrentProgress(). There isn t any way to get the same information from properties. The easiest solution is to react to one of the storyboard events listed in Table 15-3.

The animation has reached its ending point. The speed has changed, or the animation has been paused, resumed, stopped, or moved to a new position. This event also occurs when the animation clock reverses (at the end of a reversible animation) and when it accelerates or decelerates. The animation has started or ended. The animation clock has moved forward an increment, changing the animation. This event also occurs when the animation starts, stops, or ends. The animation is being removed. The animated property will subsequently return to its original value.

In this case, the event you need is CurrentTimeInvalidated, which fires every time the animation clock moves forward. (Typically, this will be 60 times per second, but if your code takes more time to execute, you may miss clock ticks.) When the CurrentTimeInvalidated event fires, the sender is a Clock object (from the System.Windows.Media.Animation namespace). The Clock object allows you to retrieve the current time as a TimeSpan and the current progress as a value from 0 to 1. Here s the code that updates the label and the progress bar: private void storyboard_CurrentTimeInvalidated(object sender, EventArgs e) { Clock storyboardClock = (Clock)sender; if (storyboardClock.CurrentProgress == null) { lblTime.Text = "[[ stopped ]]"; progressBar.Value = 0; } else { lblTime.Text = storyboardClock.CurrentTime.ToString(); progressBar.Value = (double)storyboardClock.CurrentProgress; } }

To create the SaveInformationCardToFile activity, follow these steps: 1. Right-click the project, and select Add New File. 2. Select Activity, and name the activity SaveInformationCardToFile. 3. View the code for the activity, and populate it with the following code: using System; using System.ComponentModel; using System.ComponentModel.Design; using System.Collections; using System.Drawing; using System.Workflow.ComponentModel; using System.Workflow.ComponentModel.Design; using System.Workflow.ComponentModel.Compiler; using System.Workflow.ComponentModel.Serialization; using System.Workflow.Runtime; using System.Workflow.Activities; using System.Workflow.Activities.Rules; using BeginningCardspace; using System.Xml; namespace InformationCardActivities { public partial class SaveInformationCardToFile: Activity { public SaveInformationCardToFile() { InitializeComponent(); } public static DependencyProperty SignedInformationCardProperty = System.Workflow.ComponentModel.DependencyProperty. Register("SignedInformationCard", typeof(XmlElement), typeof(SaveInformationCardToFile)); [Description( "This is the signed information card to be saved to a file.")] [Category("Miscellaneous")] [Browsable(true)] [DesignerSerializationVisibility( DesignerSerializationVisibility.Visible)] public XmlElement SignedInformationCard { get {

Tip If you use the Clock.CurrentProgress property, you don t need to perform any calculation to determine the

value for your progress bar. Instead, simply configure your progress bar with a minimum of 0 and a maximum of 1. That way, you can simply use the Clock.CurrentProgress to set the ProgressBar.Value, as in this example.

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