Figure 1-3. The Projects tab in Expression Blend 4 RC in Visual Basic .NET

Encode QR Code in Visual Basic .NET Figure 1-3. The Projects tab in Expression Blend 4 RC

Figure 1-3. The Projects tab in Expression Blend 4 RC
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Note If you are familiar with Silverlight 2, you will notice that from Silverlight 3 and later version, the Page
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class Page.xaml file and the Page.xaml.cs code-behind file representing the main application user interface (in Silverlight 2) are renamed to MainPage.xaml and MainPage.xaml.cs (in Silverlight 3 and 4), respectively.
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Along the left side of the Expression Blend screen is the toolbox. This provides access to both layout and input controls, and several tools used to modify the user interface, such as a paint bucket and a transform tool for brushes. Hold down the left mouse button when you select any icon with a white triangle in the lower-right corner, or right-click, and more tools will expand from it. Figure 1-4 shows an
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INTRODUCING SILVERLIGHT
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example of what clicking the Button icon (which looks like a mouse cursor hovering over a rounded rectangle) produces.
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Figure 1-4. The control toolbox in Expression Blend The Objects and Timeline area to the immediate right of the toolbox provides a place to create and manage animation storyboards, but more importantly for us right now, it shows the object hierarchy in XAML. After creating our application, we see [UserControl] and LayoutRoot. Click [UserControl] to highlight it and then click Properties in the top-right portion of the screen. The control with the gray highlight is the control that shows up in the Properties pane (see Figure 1-5).
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Figure 1-5. The Objects and Timeline pane in Expression Blend Just for demonstration purposes, you can also set the Layout section of the Properties pane and set the Width and Height properties of the UserControl to 900 and 100, respectively, as shown in Figure 1-6.
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Figure 1-6. Defining Width and Height properties for a control in Expression Blend You can also click XAML or Split along the right side of the design surface and view and edit the XAML directly. However, as interfaces get more complex, Expression Blend becomes an invaluable design tool for working with XAML indirectly. Hand-editing of XAML should generally be used for tweaking some XAML instead of creating full-blown user interfaces.
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Demonstrating Local Image Files Integration Using Drag-andDrop Functionality
One of the growing requests to develop a RIA is to ingrate with the local file system and have drag-anddrop functionality to insert/add/attach files to the application. Silverlight 3 introduces the Open File Dialog Box to insert files, and now Silverlight 4 introduces drag-and-drop capability to integrate with local files. Let s get started. First, go back to the already-opened FirstApplication Visual Studio project so that I can also demonstrate some enhancements in Visual Studio 2010. Now if you double-click on the MainPage.xaml file to load the file, as shown in Figure 1-7, you will see the editable XAML design view to visually design the user interface, as well the XAML view to directly change the XAML code. The XAML code and the look and feel will be changed and reflected immediately in both views when a change is made in one of the views.
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Figure 1-7. Design and XAML view in Visual Studio 2010 As you see in Figure 1-7, the main change in the definition of the UserControl is the inclusion of the DesignHeight and DesignWidth properties of the UserControl, which are set by default to 300 and 400. This helps you to design your user interface in a controlled and managed way at the design time, if you are not setting the UserControl s specific height and width. The design time height and width will not be reflected at runtime. Now, in order to add a title and rich text area to insert images, add StackPanel control within the Grid control, as shown here. <UserControl x:Class="FirstApplication.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="400"> <Grid x:Name="LayoutRoot" Background="White"> <StackPanel> </StackPanel> </Grid> </UserControl>
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