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Public Overloads Function AddRecord( _ ByVal seriesText As String) As Integer ' ----- Add a new record, but use a starting value ' previously entered by the user. ActiveID = -1 PrepareFormFields( ) RecordFullName.Text = seriesText Me.ShowDialog( ) If (Me.DialogResult = Windows.Forms.DialogResult.OK) Then _ Return ActiveID Else Return -1 End Function
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Yes, we could have used some name other than AddRecord for this function and avoided adding an overload. But it s nice to keep things consistent. Holiday.vb This form manages the records in the Holiday table. In a later chapter, we ll add a cache of holidays within the program for quick access. Patron.vb The Patron form provides editing services for records in the Patron table, and appears in Figure 12-7.
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12: Overloads and Extensions
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This form includes a TabControl to help break up the number of fields the user has to experience at once. If you have ever used the tab control included with Visual Basic 6.0, you ll quickly appreciate the .NET replacement. It manages all of the panel-switching logic automatically when the user selects a different tab. Each panel is a separate TabPage class instance. In your code, forcing the tab control to display a different tab is as easy as assigning the appropriate TabPage instance to the TabControl object s SelectedTab property, as with this code line from the ValidateFormData function:
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TabPatron.SelectedTab = TabGeneral
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Although this form looks quite complex, it s made up almost entirely of code we ve seen in other forms. Beyond the standard overrides of BaseCodeForm members, this form includes bar code scanning support borrowed from the ItemCopy form, password logic stolen from the UserName form, and name-matching code similar to that used in the Author form. I included a Manage Patron s Items button on the form, but we won t add its logic until a later chapter. An extra public function, EditRecordLimited, becomes important at that time. Publisher.vb The Publisher form lets the user edit the records in the Publisher table. It s a pretty simple form with only two data entry fields. A Status field indicates how many NamedItem records link to this publisher. A small button appears to the right of the text entry field for the publisher s web site. This is the show me the web site button, and when clicked, it brings up the supplied web page in the user s default browser. To enable this button, add the following code to the ShowWeb button s Click event handler.
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' ----- Show the web site displayed in the field. Dim newProcess As ProcessStartInfo On Error Resume Next If (Trim(RecordWeb.Text) = "") Then Return newProcess = New ProcessStartInfo(Trim(RecordWeb.Text)) Process.Start(newProcess)
SystemValue.vb This code editor handles items in the SystemValue table. Although we will connect it to a link on the main Library form in this chapter, we will change this access method in a future chapter. Well, that s 11 of the 12 derived forms. The last one is the NamedItem form, shown in Figure 12-8.
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The NamedItem form is the largest and most complex of the forms that derive from BaseCodeForm. It edits primary library items recorded in the NamedItem database table. It s complex because it also directly or indirectly manages records in other subordinate tables: ItemAuthor, ItemCopy, ItemKeyword, ItemSubject, and indirectly, Author, Keyword, Publisher, and Subject. All of the fields on the General and Classification tabs are basic data entry fields that flow directly into the NamedItem table, just as is done with the other record-editing forms. The Publisher and Series fields use separate selection forms (PublisherAddLocate and SeriesAddLocate) to obtain the ID values stored in NamedItem. Here s the code that looks up the publisher:
' ----- Prompt the user. newPublisher = (New PublisherAddLocate).PromptUser( ) If (newPublisher = -1) Then Return ' ----- Check to clear the publisher. If (newPublisher = -2) Then RecordPublisher.Text = "Not Available" PublisherID = -1 Return End If
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