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Storyboards and Animation
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Animation in Silverlight is achieved by changing a property over a set amount of time using a timeline. Animations are contained within a storyboard, and come in a number of flavors:
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DoubleAnimation and DoubleAnimationUsingKeyFrames: Used to change a double-based property, such as Canvas.Left or Opacity PointAnimation and PointAnimationUsingKeyFrames: Used to change a point value over
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time
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ColorAnimation and ColorAnimationUsingKeyFrames: Used to change a color value over
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time You may have noticed that there are two types for each value: one standard animation and one that uses keyframes.
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Programming with JavaScript
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In the previous sections, you took a quick tour of the various controls that you can use in Silverlight XAML and looked at how to use their properties to set them. Typically, a designer will use a tool like Microsoft Expression Blend to put together the UI design, expressed as XAML, and may do some fine-tweaking by editing the XAML code. In order to get the UI to do something meaningful, the programmer gets involved to activate the design. Here s where the JavaScript programming model comes in. You took a
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CHAPTER 16 s PROGRAMMING SILVERLIGHT WITH XAML AND JAVASCRIPT
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first look at this in 15 when you saw how scripting was used to instantiate and manipulate the control. In this chapter, you ll take a look at how you can manipulate your XAML UI. It s a very high-level overview, so for more details, take a look at a book such as Introducing Silverlight 1.0 (Microsoft Press, 2007).
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Editing Properties
In a programming sense, XAML tags should be treated as objects, with their attributes directly analogous to properties. Thus, when programming, you can just say <OBJECT>. <PROPERTY>=<VALUE>. One exception to this is when you are addressing attached properties that already have a dot syntax, such as Canvas.Left. In this case, you will use setValue and getValue to write and read properties, respectively. In JavaScript, your object will be a var, so you will need to set a var value to the object that you want to manipulate. You do this using the findName method of the Silverlight control to seek through its XAML content to get a handle on the object that you want. You can then access its programming model. To do this, the object must be named, and in XAML, you name an object using its x:Name attribute. That s a lot of theory, which upon first reading might be a little confusing, but with a little practice, you ll see that it is straightforward. Here s an example of a XAML document containing a TextBlock called txt:
<Canvas xmlns="http://schemas.microsoft.com/client/2007" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Width="640" Height="480" Background="White" x:Name="Page"> <TextBlock Width="197" Height="59" Text="This is the first text" TextWrapping="Wrap" Canvas.Left="96" Canvas.Top="35" x:Name="txt"/> </Canvas>
In JavaScript, you will need a reference to the Silverlight control. One way of getting this is by capturing the Load event of the control, which raises references to the control as well as its current context. See 15 for more details on this. Once you have this reference, you can seek the item by using findName on the control s content.
function handleLoad(control, context, sender) { var txtBlock=control.content.findName("txt"); txtBlock.Text = "This is the new Text"; }
CHAPTER 16 s PROGRAMMING SILVERLIGHT WITH XAML AND JAVASCRIPT
In this case, the txtBlock var is set to a reference to the TextBlock called txt. Now that you have this, you can just change its Text property using the standard dot syntax. In addition to the dot syntax, you can use the setValue and getValue methods on the object. When using attached properties, you have to use this methodology. Here s an example:
txtBlock.setValue("Canvas.Top",200);
Using Common Methods
There are a number of methods that all XAML elements have in common. We ll first summarize them, and then look into the more important methods that exist on specific controls.
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