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Namespace My Class MyApplication End Class End Namespace
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Let s pretend that the initialization required for the Library Project takes about three seconds. .NET includes a Sleep method that delays the code for a specific number of milliseconds. Code snippet 1 adds the Startup event handler for the application. Add it between MyApplication s Class and End Class keywords.
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INSERT SNIPPET Insert 7, Snippet Item 1.
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Private Sub MyApplication_Startup(ByVal sender As Object, _ ByVal e As Microsoft.VisualBasic.ApplicationServices. _ StartupEventArgs) Handles Me.Startup ' ----- Take a three-second nap. System.Threading.Thread.Sleep(3000) End Sub
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Now run the program, and you will see the splash screen stick around for about three seconds (3,000 milliseconds). As gratifying as it is to see the splash screen for that long, there s a good chance that the actual database and application initialization code will take much less than three seconds. I mean, we re talking about SQL Server here. It s supposed to be blazing fast. So, it s clear that we still need to delay the removal of the splash screen. The My. Application object just happens to include the very property we need to enforce a delay. The MinimumSplashScreenDisplayTime property indicates the minimum number of milliseconds that the splash screen must be displayed. The bad part is that you have to assign it in a really strange place, at least when compared to how much Visual Basic programming we ve learned so far. Delete all the code that you added from snippet 1, which would be the entire MyApplication_Startup method. Then fill in that empty space with the following code.
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INSERT SNIPPET Insert 7, Snippet Item 2.
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Protected Overrides Function OnInitialize _ (ByVal commandLineArgs As System.Collections. _ ObjectModel.ReadOnlyCollection(Of String)) As Boolean ' ----- Display the splash form for at least 3 seconds. My.Application.MinimumSplashScreenDisplayTime = 3000 Return MyBase.OnInitialize(commandLineArgs) End Function
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That code block contains a lot of things we just haven t talked about yet, and won t talk about for a few more chapters. Suffice it to say that the OnInitialize method is one of the first things that happens in the lifetime of the program, and that is the place where MinimumSplashScreenDisplayTime must be assigned.
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The last thing to do for the splash screen is to include some code that displays the version number. We already did this for the About form back in 5, so we ll just add similar code to the Splash form s Load event. We ll update the copyright message, too. Open the source code for the Splash form and add the following code.
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INSERT SNIPPET Insert 7, Snippet Item 3.
Private Sub Splash_Load(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles Me.Load ' ----- Update the version number. With My.Application.Info.Version ProgramVersion.Text = "Version " & .Major & "." & _ .Minor & " Revision " & .Revision End With ProgramCopyright.Text = My.Application.Info.Copyright End Sub
Run the program again and sit in awe as you witness a fully functional splash screen.
Con guring the Main Form
Although we designed a main form in an earlier chapter, it was pretty sparse, including only an About button. This chapter s project adds all the user interface elements to the form. In fact, I ve already added that form s controls to its surface for you (see Figure 7-12). But you can add some of the event handlers that will give some of its display pizzazz. All the general event code for the form appears as code snippet 4.
INSERT SNIPPET Insert 7, Snippet Item 4.
Most of this code exists to move things around on the display. For example, the user can access different features of the form by clicking on the icons or related text labels along the left side of the form. Each icon and label triggers one of seven common routines that exist to rearrange the furniture. The upper-left icon, PicLibraryItem, calls the common TaskLibraryItem routine when clicked.
Private Sub PicLibraryItem_Click( _ ByVal sender As System.Object, _ ByVal e As System.EventArgs) _ Handles PicLibraryItem.Click ' ----- Library Item mode. TaskLibraryItem( ) End Sub
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