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You can also add your own buttons using addButton and give them a role The buttons are placed where the user expects them when you tell Qt which button has the HelpRole and which has the ApplyRole Listing 3-6 shows a small part of a dialog using the button box First the button box is created with a direction it can be either Horizontal or Vertical Then a button is created and connected to a slot in the dialog before it is added to the button box with a QDialogButtonBox role Figure 3-10 shows the resulting dialog on a Windows XP system Compare this with Figure 3-11, in which the style has been forced to Cleanlooks the style for Gnome desktops.

Execute the workflow, and provide values for the parameters as prompted You ll get the message box that the part number is required for a purchase order, but this time you won t get the message with the purchase order number in it Instead of the purchase order number message box, you ll encounter an exception message This is because the purchase order output parameter has no value To account for this situation, open Module1vb again and change OnWorkflowCompleted to the following: Shared Sub OnWorkflowCompleted(ByVal sender As Object, ByVal e As WorkflowCompletedEventArgs) If Not eOutputParameters("PurchaseOrderNumber") Is Nothing Then MsgBox("Purchase Order Number is: " & eOutputParameters("PurchaseOrderNumber")ToString) End If WaitHandleSet() End Sub The new If statement within the OnWorkflowCompleted sub determines if there s a value for the output parameter PurchaseOrderNumber.

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The ordering is adapted to the current style, which makes the user experience better because the user can stick to old habits instead of reading the text on all the buttons before clicking Listing 3-6 Creating a button, connecting it, and then adding it with a role to a button box QDialogButtonBox *box = new QDialogButtonBox( Qt::Horizontal ); button = new QPushButton( "Ok" ); connect( button, SIGNAL(clicked()), this, SLOT(okClicked()) ); box->addButton( button, QDialogButtonBox::AcceptRole );.

Attaches the class specified in className to the anchor. It must be a valid, defined CSS class available to the host page. Passes focus to the anchor. If the anchor is off the page, scrolls the page until it is in view. Unattaches the CSS class specified in className. If the CSS className is currently attached, unattaches it; otherwise, attaches it.

Note Instead of connecting the button to the slot in Listing 3-6, you could have connected the role of the

button box as this connect(box, SIGNAL(accepted()), this, SLOT(okClicked())).

The HyperLink control has the properties described in Table 4-20. Table 4-20. HyperLink Control Properties

If an error is encountered during validation of the parameters, the PurchaseOrderNumber output parameter won t have a value, and therefore will error out if you attempt to display it The next step is to add all the necessary condition subs After you add the condition subs, then you can add the IfElse activities and name them, along with setting the Condition property Follow the same pattern as was done for the part number, and your resulting code should look like the following: Public Sub PartNumberPresentCondition(ByVal sender As Object, ByVal e As ConditionalEventArgs) eResult = StrPartNumber <> StringEmpty End Sub Public Sub PartNumberMissingCondition(ByVal sender As Object, ByVal e As ConditionalEventArgs) eResult = StrPartNumber = StringEmpty End Sub Public Sub PurchaseDatePresentCondition(ByVal sender As Object, ByVal e As ConditionalEventArgs) eResult = IsDate(DtePurchaseDate) End Sub Public Sub PurchaseDateMissingCondition(ByVal sender As Object, ByVal e As ConditionalEventArgs) e.

The label widget, one of the most common widgets, is used to show text that helps the user better understand dialogs. When using a QLabel, it is possible to give it a keyboard shortcut or mnemonic by entering an ampersand in the label text just before the letter that you want to be the mnemonic. For example, by setting the text to "E&xit", the mnemonic is x, and the keyboard shortcut is Alt+x. By assigning a buddy widget to the label using setBuddy(QWidget*), the user moves the focus to that widget by pressing the mnemonic. This is shown in Listing 3-7, in which two labels are made buddies to two line edits. If you are using Designer, you can reach the buddy editing mode from the working mode toolbar. You connect labels to their buddy widgets by drawing arrows, just as you do when you make signals and slots connections. Listing 3-7 shows how a dialog is populated by two labels and two line edits in a grid layout. The labels are assigned each of the line edits as buddies. If you try running the example, you will find that you can move between the line edits using the Alt key combined with the mnemonic of the label in question.

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