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In this example, you will continue looking at binding information between controls but will look a little further into the data transformation by using a custom transformation. In this page there is a text box, a selection list, and a label. When you type something into the text box and tab out of it, the label will display the text you typed using the color specified in the selection list. You can achieve this, as you would expect, through a binding between the label and

Note Event filtering is a way to have a peek at the events sent to a widget before they reach the widget.

Before the editing widget is ready for the user, it must get the current value from the model. This is the responsibility of the setEditorData method. The method, shown in Listing 5-15, gets the value from the model. The value is converted to an integer using toInt(bool*), so non-numeric values will be converted to the value zero. Finally, the value of the editor widget is set by using the setValue(int) method.

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the text box. Additionally, if you change the selection on the list, the label will get updated again, with the new color as well as with a text indicator showing that the update came from the selection list. To do this, you will write a custom transform (using JavaScript) and map it to the binding. You can see the page in Figure 5-6.

Listing 5-15. Initializing the editor widget according to the model value void BarDelegate::setEditorData( QWidget *editor, const QModelIndex &index ) const { int value = index.model()->data( index, Qt::DisplayRole ).toInt(); static_cast<QSlider*>( editor )->setValue( value ); } The editor widget can be created, placed, and sized correctly, and then get initialized with the current value. The user can then edit the value in a meaningful way, but there is no way for the new value to get to the model. This is the task handled by setModelData(QWidget*, QAbstractItemModel*, const QModelIndex&). You can see the method in Listing 5-16. The code is fairly straightforward, even if it is slightly obscured by a cast. What happens is that the value from the editor widget is taken and used in a setData(const QModelIndex&, const QVariant&, int) call. The affected model index, index, is passed to the setModelData method as an argument, so there are no real hurdles left. Listing 5-16. Getting the value from the editor widget and updating the model void BarDelegate::setModelData( QWidget *editor, QAbstractItemModel *model, const QModelIndex &index ) const { model->setData( index, static_cast<QSlider*>( editor )->value() ); } The resulting application shows values as bars and enables the user to edit them using a slider. (Refer to Figure 5-6 for the running application.)

Most workflow applications model a business process Business processes have business rules associated with them For example, an order entry business process might require that for an order over $1,000 a special credit check must be done The business rule would be as follows: if the order amount is greater than 1,000, then perform a special credit check This logic can easily be created as an If-Else statement, or in the case of WF, an IfElse activity However, you can also make this a rule within the workflow One advantage of creating a rule instead of a hard-coded activity is that you can change the rule more easily If the business begins to sell more expensive items and wants to change the order limit to $5,000, a rule can be changed easily, but an IfElse activity requires that activity to be changed.

When you feel that you can t get to where you want by using the available views, delegates, or any other tricks, you face a situation in which you have to implement a view of your own. Figure 5-7 shows a table and a custom view showing the selected item. The custom view shows a single item at a time (or a text explaining it if more than one item is selected at a time). It is based around a QAbstractItemView and uses a QLabel for showing the text.

The complete script for this page is as follows: <script type="text/xml-script"> <page xmlns:script="http://schemas.microsoft.com/xml-script/2005"> <components> <textBox targetElement="textBoxText" /> <select targetElement="selectStyle"> <selectionChanged> <invokeMethod target="setCss" method="evaluateIn" /> </selectionChanged> </select> <label targetElement="labelText"> <bindings> <binding dataContext="textBoxText" dataPath="text" property="text" />

When implementing a custom view, you must provide implementations of a whole bunch of methods. Some methods are important; others just provide a valid return value. Which methods need a complex implementation largely depends on the type of view you are implementing. In Listing 5-17, you can see the class declaration of the custom view SingleItemView. All methods except updateText() are required because they are declared as pure abstract methods in QAbstractItemView.

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