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Part II
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Silverlight Design Fundamentals
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s 6, 7, and 8 provide more detailed information about the relationship between code-behind pages and XAML.
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Understanding XML Namespaces
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A very important aspect of XAML that you need to be familiar with is the concept of namespaces. An XML namespace is a method to avoid element name conflicts when using multiple libraries. XML namespaces are implemented in Silverlight XAML files by adding an xmlns= URI attribute to the root UserControl element for each library that you are using in the file. For example, the following line of code adds the XAML presentation namespace to an XAML file:
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xmlns= http://schemas.microsoft.com/winfx/2006/xaml/presentation
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When using multiple Silverlight namespaces in the same XAML file, you will need to distinguish them from each other by specifying a prefix using the xmlns:prefix= clr-namespace:nam espace;assembly=library assembly . For example, to add the System.Windows. Controls namespace along with the presentation namespace, you could use the following lines of code:
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xmlns= http://schemas.microsoft.com/winfx/2006/xaml/presentation xmlns:ex= clr-namespace:System.Windows.Controls;assembly=System. Windows.Controls.Extended
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To access an element in a specific namespace, the prefix is added to the element name. For example, to create a Calendar control located in the System.Windows.Controls namespace, you would use the following code:
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<ex:Calendar></ex:Calendar>
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Another common namespace declaration is for the XAML namespace. The XAML namespace is used to define the Class and Name attributes of Silverlight controls. The XAML namespace is typically given the x: prefix, for example:
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xmlns:x= http://schemas.microsoft.com/winfx/2006/xaml
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Most of the Silverlight controls can be accessed using the presentation namespace previously defined. Most of the rest of the Silverlight controls, such as Calendar and TabControl, are accessed using the SystemWindows.Controls.Extended namespace also previously described. Some others can be accessed using the System.Windows.Controls.Primitives namespace.
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Using XAML to Build Declarative Silverlight Applications
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The following code shows an example UserControl statement that defines all of these namespaces:
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<UserControl xmlns:prim= clr-namespace:System.Windows.Controls. Primitives;assembly=System.Windows.Controls.Extended xmlns:ex= clr-namespace:System.Windows. Controls;assembly=System.Windows.Controls.Extended x:Class= SilverlightApplication1.Page xmlns= http://schemas.microsoft.com/winfx/2006/xaml/ presentation xmlns:x= http://schemas.microsoft.com/winfx/2006/xaml >
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Creating Silverlight Controls
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Silverlight 2 provides a fairly robust set of controls that enable you to quickly add rich UI elements to your applications. The purpose of this section is to familiarize you with some of the different Silverlight controls that are used to render UI elements to Silverlight applications. This section discusses some of the common properties that allow you to affect the look and feel of the controls and how to implement these controls in XAML.
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Creating a Button
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The Button control in Silverlight creates a standard rectangle button. The size of the button is determined by the Height and Width properties. Text can be added to the button by setting the Content property. For example, the following code creates a Button control that reads Click Me and is 100 pixels wide and 50 pixels high:
<Button Content= Click Me Height= 50 Width= 150 />
You can use a RepeatButton control in place of a Button control. The only difference is that the RepeatButton repeatedly raises the Click event as long as the button is clicked and the mouse button held down. This can be useful if you want the button to adjust a value incrementally. The user can just hold down a RepeatButton whereas a Button control needs to be clicked each time.
Like most Silverlight controls, Button controls provide several properties that can be set to customize the look and feel of the control. For example, the following code defines the same button but changes the FontFamily, FontSize, FontWeight, FontStyle, Foreground, and Background properties to change the appearance:
Part II
Silverlight Design Fundamentals
<Button Content= Click Me Height= 50 Width= 150 FontFamily= Trebuchet FontSize= 24 FontWeight= Bold FontStyle= Italic Foreground= Red Background= Blue />
Figure 3.1 shows an example of the simple Button control and the more stylish Button control.
FIGURE 3.1 Rendered Button controls
Creating a Calendar
The Calendar control in Silverlight is used to render a calendar in the application that can be used to simply view dates, or it can be used to select dates. The size of the calendar is determined by the Height and Width properties. Most of the work with calendars is done programmatically; however, you can set some layout properties such as the FirstDayOfWeek and IsTodayHighlighted properties. You can also control some of the behavior such as setting the AreDatesInPastSelectable property to inhibit past dates from being selected in the Calendar control, as shown in the following code:
<Calendar FirstDayOfWeek= Monday IsTodayHighlighted= True AreDatesInPastSelectable= True Height= 200 Width= 200 />