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' ----- Update the on-screen values. RecordFine.Text = Format(fineAmount, "Currency") RecordPayments.Text = Format(paidAmount, "Currency") RecordBalance.Text = Format(fineAmount - paidAmount, _ "Currency")
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The EventHistory list is a variable-line-height owner draw control, similar to one we designed in 18. Its MeasureItem event handler sets the height of each list item (comments appear on a second line when available), and its DrawItem event handler does the actual drawing of each data column and the comments.
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Managing All Fines and Payments
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The Patron Payment form lets a librarian enter individual fines and payments, but the program still needs a form to manage all fines and payments for a single patron, a form that calls up the Patron Payment form when needed. The new PatronRecord.vb form fulfills this need. I ve added this form to your project, although you need to enable it. Select it in the Solution Explorer, and change its Build Action property (in the Properties panel) from None to Compile. Figure 19-13 shows the controls on this form. This form is available to both administrators and patrons, although some of the fields are hidden from patron view. The Password button leads to the Change Patron Password form we added earlier in this chapter. The Edit button, available only to administrators, provides access to the full Patron.vb form. The main section of the Patron Record form displays a list of all items the patron currently has checked out. It includes a Renew button that lets a patron extend the due date for a checked-out item. We ll add the code for that feature in a later chapter. The form also displays a summary of all pending fines and payments. Figure 19-14 shows the Fines tab and its fields.
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19: Localization and Globalization
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The Print Balance Ticket button generates a printed receipt of all fines and payments for the patron. We ll add its code in a later chapter. Most of the code in this form exists to manage fines and payments. To add a charge or payment, the librarian selects an item from the Fines list, and then clicks the Fines and Payments button. This brings up the just-added Patron Payment form. The two main lists on the Patron Record form will each forgo the standard ListItemData class, and use a more property-rich class to support the display needs
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of each list. We ll add this PatronDetailItem as a separate public class since (as we ll see in a later chapter) it will be used elsewhere in the Library Project. Create a new class named PatronDetailItem.vb, and use the following code for its content.
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INSERT SNIPPET Insert 19, Snippet Item 8.
Private Class PatronDetailItem Public DetailID As Integer Public TitleText As String Public DueDate As Date Public FineAmount As Decimal Public PaidAmount As Decimal Public BalanceDue As Decimal End Class
Now back to the PatronRecord form. As you can tell from looking at the form, the Fines list displays several columns of currency values. Let s add the code that correctly formats the currency according to the regional monetary settings. First, locate the RefreshPaymentFines method. This routine adds up all fines and payments, and displays the result through the BalanceDue Label control. Near the top of this routine is a comment that states, Clear the current list. Add the following code just after this comment.
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Fines.Items.Clear( ) totalBalance = 0@ BalanceDue.Text = Format(0@, "Currency") Me.Cursor = Windows.Forms.Cursors.WaitCursor
We could have just set the BalanceDue field to $0.00, but this would not be properly globalized. Using the Format function with Currency as the formatting rule still results in $0.00 when used in America, but properly adjusts for other cultures as well. The RefreshPaymentFines method does a whole bunch of calculations, and ends up with the remaining patron balance in the totalBalance local variable. Locate the comment that reads, Show the total balance, and add the following code just after it.
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