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Imagine you want to build a document storage website. Naturally, users would expect to be able to upload their documents to this website and retrieve them later, using a browser-based user interface. However, you survey prospective and current users and find that in addition to a browser-based user interface, they want a web service that will allow computer programs to interact with this website. You give the issue some thought, and you come with the following four use case scenarios for this web service: Uploading documents to a project Downloading documents from a project Getting information about all the projects owned by a user Removing documents from a project You ll now examine each use case in detail.

The previous sections show you how to use XAML from a code-based application. As a .NET developer, this is what you ll spend most of your time doing. However, it s also possible to use a XAML file without creating any code. This is called a loose XAML file. Loose XAML files can be opened directly in Internet Explorer. (Assuming you ve installed the .NET Framework 3.0 or are running Windows Vista, which has it preinstalled.)

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To begin implementing the application, update the Form with a Timer member variable (named swellTimer), a string (strFontFace) to represent the current font face, and an Integer (swellValue) to represent the amount to adjust the font size. Within the Form s constructor, configure the Timer to emit a Tick event every 100 milliseconds: Public Class MainForm Private swellValue As Integer Private strFontFace As String = "WingDings" Sub New() ' This call is required by the Windows Forms designer. InitializeComponent() ' Add any initialization after the InitializeComponent() call. BackColor = Color.Honeydew CenterToScreen() ' Configure the Timer. swellTimer.Enabled = True

s Note If your XAML file uses code, it can t be opened in Internet Explorer. However, you can build a

swellTimerInterval = 100 End Sub End Class Now, handle the Tick event, and within the generated handler, increase the value of the swellValue data member by 5 Recall that the swellValue integer will be added to the current font size to provide a simple animation (assume swellValue has a maximum upper limit of 50) To help reduce the flicker that can occur when redrawing the entire client area, notice how the call to Invalidate() is only refreshing the upper rectangular area of the Form: Private Sub swellTimer_Tick(ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) Handles swellTimerTick ' Increase current swellValue by 5 swellValue += 5 ' If this value is greater than or equal to 50, reset to zero If swellValue >= 50 Then swellValue = 0 End If ' Just invalidate the 'minimal dirty rectangle' to help reduce flicker Invalidate(New Rectangle(0, 0, ClientRectangle.

At this point, it probably seems relatively useless to create a loose XAML file after all, what s the point of a user interface with no code to drive it However, as you explore XAML you ll discover several features that are entirely declarative. These include features such as animation, triggers, data binding, and links (which can point to other loose XAML files). Using these features, you can build a few very simple no-code XAML files. They won t seem like complete applications, but they can accomplish quite a bit more than static HTML pages. To try out a loose XAML page, take a .xaml file and make these changes: Remove the Class attribute on the root element. Remove any attributes that attach event handlers (such as the Button.Click attribute). Change the name of the opening and closing tag from Window to Page. Internet Explorer can only show hosted pages, not stand-alone windows. You can then double-click your .xaml file to load it up in Internet Explorer. Figure 2-4 shows a converted EightBall.xaml page, which is included with the downloadable code for this chapter. You can type in the top text box, but because the application lacks the code-behind file, nothing happens when you click the button. If you want to create a more capable browser-based application that can include code, you ll need to use the techniques described in 9.

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