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The solution is to see that if the parent object is not the root object, it must also have a grandparent. Using the indexOf method on the children array of the grandparent, you can get the row of the parent. It s important to know the order of your children! Listing 5-35. Building an index for the parent requires asking the grandparent for the indexOf method. QModelIndex ObjectTreeModel::parent(const QModelIndex &index) const { if( !index.isValid() ) return QModelIndex(); QObject *indexObject = static_cast<QObject*>( index.internalPointer() ); QObject *parentObject = indexObject->parent(); if( parentObject == m_root ) return QModelIndex(); QObject *grandParentObject = parentObject->parent(); return createIndex( grandParentObject->children().indexOf( parentObject ), 0, parentObject ); } To try out the all-new ObjectTreeModel, you can use the main function from Listing 5-36. The largest part of the main function is used to build a tree of QObjects. Creating a model with a pointer to the root object and passing it to the view is done in just four lines of code (and that includes creating and showing the view). The running application is shown in Figure 5-10. Listing 5-36. Building a tree of QObjects and then showing it using the custom tree model int main( int argc, char **argv ) { QApplication app( argc, argv ); QObject root; root.setObjectName( "root" ); QObject *child; QObject *foo = new QObject( &root ); foo->setObjectName( "foo" ); child = new QObject( foo ); child->setObjectName( "Mark" ); child = new QObject( foo ); child->setObjectName( "Bob" ); child = new QObject( foo ); child->setObjectName( "Kent" );

QObject *bar = new QObject( &root ); bar->setObjectName( "bar" ); ... ObjectTreeModel model( &root ); QTreeView tree; tree.setModel( &model ); tree.show(); return app.exec(); }

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A common function of a client web application is data entry through forms. The typical workflow for forms is that the user will enter information, and a special type of input tag called a submit button triggers an HTTP post of the information to a server. The server then processes the submitted information and returns a response. If the data is invalid, the server will return a message indicating this, and the page developer will write a script that emphasizes this to the user. This transaction involves at least one round-trip to the server. You can also perform basic validation in JavaScript prior to form submission; this can be very effective and certainly faster for the user. However, performing validation using JavaScript can be a complex task, and thus it s a problem that Atlas components lend themselves naturally to for a fix. In this example, you will perform the most basic validation there is checking whether the user has entered any information into a text box. You can see it in action in Figure 5-10. This form will validate the text box and give feedback to the user by putting a red asterisk on the screen beside the text box once the user tabs out of it. It also provides a tooltip on this asterisk, so that if you hover over the asterisk with your mouse, a tooltip will tell you the problem.

The previous two models a two-dimensional array and a tree showed complex structures, but they were read-only. The IntModel shown here is very simple just a list of integers but it can be edited. Listing 5-37 shows the class declaration of the IntModel that is based on the simplest of the abstract model bases: QAbstractListModel (which means that a one-dimensional list is being created). This class has fewer methods than MulModel and ObjectTreeModel. The only news is the setData method used to make the model writeable. Listing 5-37. The IntModel has fewer methods than MulModel, but MulModel does not have setData. class IntModel : public QAbstractListModel { public: IntModel( int count, QObject *parent = 0 ); Qt::ItemFlags flags( const QModelIndex &index ) const; QVariant data( const QModelIndex &index, int role = Qt::DisplayRole ) const; int rowCount( const QModelIndex &parent = QModelIndex() ) const; bool setData( const QModelIndex &index, const QVariant &value, int role = Qt::EditRole ); private: QList<int> m_values; }; Because IntModel is a very simple model, it also has a number of simple methods. First, the constructor shown in Listing 5-38 initializes the list with the number of values specified through count.

Now that both branches of the IfElse activity have a condition set, add a Code activity to the GreaterThan0 branch called GreaterThan0Code. Generate Handlers for this activity and add the following code: msgbox ("Value greater than 0") The completed code for the generated Handler is as follows: Private Sub GreaterThan0Code_ExecuteCode(ByVal sender As System.Object, ByVal e As System.EventArgs) MsgBox("Value greater than 0") End Sub Add a Code activity to the LessThanEqual0 branch called LessThanEqualCode. Generate Handlers for this activity and add the following code: msgbox("Value Less than or Equal 0") Following is the completed code: Private Sub LessThanEqual0Code_ExecuteCode(ByVal sender As System.Object, ByVal e As System.EventArgs) MsgBox("Value less than or equal 0") End Sub Now execute the workflow, and you ll see the GreaterThan0 branch was executed. After the workflow has completed and debugging has stopped, open the Solution Explorer for this project. If you aren t already showing all files, click the second button from the left on the top of the Solution Explorer to view all files for the project. Once you do that, a plus sign appears next to the Workflow1.vb file name. Click it and you ll see two files below it, as shown in Figure 5-9.

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