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The previous chapter introduced the purchase order application by setting up the database, table, and code to add a purchase order. Now, you ll use the activities covered in this chapter (IfElse) to validate the data in the parameters, and you ll also use the While activity to display data. Begin by opening the VBPurchaseOrderConsole application created in the previous chapter. Open Module1.vb and place a comment marker (single quote) next to the lines of code that prompt for and read the part number: 'Console.Write("Enter the Part Number:") 'Parameters.Add("PartNumber", Console.ReadLine) Execute the workflow. The prompt for the part number won t appear, and no value will be added to the record for the part number. However, the record will be created and a purchase order number provided. All public properties of a workflow are optional, and therefore might not be provided by the outside application. For this reason, you ll use a series of IfElse activities to verify that all parameters have been provided and they re within a valid range. If a parameter is either not provided or not in the correct range, a message box will appear for the user. The purchase date must either be the current date or a future date, and the quantity ordered must be greater than zero. The logic for this validation is as follows:

Listing 3-3. Modifying and applying a custom policy QSizePolicy policy = label->sizePolicy(); policy.setHorizontalStretch( 3 ); label->setSizePolicy( policy ); policy = lineEdit->sizePolicy(); policy.setHorizontalStretch( 1 ); lineEdit->setSizePolicy( policy ); The code in Listing 3-3 shows two things. First, it shows you how to copy and apply a policy using sizePolicy and setSizePolicy. It also shows stretch factors, with which you can control the relative size of the widgets in a dialog. Three buttons are shown (see Figure 3-5), and all have been assigned the horizontal size policy Preferred. Their stretch factors are (left to right) 1, 3, and 2. This means that the first button takes 1/(1+3+2) one-sixth of the width available; the second button takes 3/(1+3+2) one-half; and the third uses 2/(1+3+2) one-third.

The Image control has the properties described in Table 4-17.

Figure 3-5. Buttons with stretch factors (left to right: 1, 3, and 2)

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Up to now you have looked at size policies and used horizontal and vertical layouts. From Designer you can attain the three most common layouts: horizontal, vertical, and grid. The box layouts (which you have seen several times) are available through the classes QHBoxLayout (horizontal) and QVBoxLayout (vertical). They simply put the widgets in a row or column from left to right or from top-down. Figures 3-6 and 3-7 show both classes in action. In the examples, the widgets were added in this order: foo, bar, baz. When used in combination with stretch factors and size policies, they can be used as a basis for many different dialog layouts.

bindings dataContext id accessKey associatedElement behaviors cssClass enabled style tabIndex visible visibilityMode alternateText height

If PartNumber is empty then Display error message Else If PurchaseDate is empty then Display error message Else If ExpectedDate is empty then Display error message Else If BuyerLogin is empty then Display error message Else If BuyerName is empty then Display error message Else If QuantityOrdered is empty then Display error message Else If ExpectedDate<CurrentDate then Display error message Else If QuantityOrdered>0 then AddPurchaseOrder Else Display error message End if End if End if End if End if End if End if End if Add an IfElse activity called CheckPartNumber. Name the left branch PartNumberPresent and the right PartNumberMissing. Right-click the workflow and add the following code to the end of the workflow code file: Public Sub PartNumberPresentCondition(ByVal sender As Object, ByVal e As ConditionalEventArgs) e.Result = StrPartNumber <> String.Empty End Sub Public Sub PartNumberMissingCondition(ByVal sender As Object, ByVal e As ConditionalEventArgs) e.Result = StrPartNumber = String.Empty End Sub

If you need to, you can alter the direction in which widgets are added by using the setDirection Tip

method. This means that you can add widgets from right to left to a horizontal layout or upwards to a vertical layout.

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