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In this chapter, you were introduced to the overall architecture of Atlas, and you went on a tour of the various features of this architecture and how Atlas can empower your development of richer browser-based clients. Atlas is based on two pillars: the script library, which encapsulates many common functions as well as provides an object-oriented API layer for JavaScript developers and proxies to network services, and the server extensions, which provide server-based controls that can be used to implicitly generate JavaScript code that uses the libraries to implement your application on the client but that can also be debugged and maintained as server-side web applications. I also introduced the concepts of components and controls. In addition, I introduced data binding and gave a simple demonstration of how to connect client applications directly to web services or other middleware. In addition, I showed how to use Atlas behaviors browser-independent, JavaScript-based enhancements to UI elements that are implemented on those elements using attribution.

If you compare the index methods with the ObjectTreeModel class and the MulModel class, you can see some real differences, which is expected because the data is represented in different ways (and it is also indexed differently) In the MulModel, you didn t have to provide an index method because the QAbstractTableModel implemented it for you The ObjectTreeModel class index method takes a model index, parent, a column, and a row; it gives a location in a table in the tree The mapping of an index to the actual tree is handled through the internalPointer() method of the model index This method makes it possible to store a pointer in each index, and you can store a pointer to the indexed QObject If the index is valid, you can get the appropriate QObject, and for it you want each child to correspond to a row.

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Figure 5-5. Condition1 within the Select Condition dialog Notice the Valid column after the name of the condition. This shows whether the condition is valid or not, and whether it will be executed properly You can also preview the condition without entering the condition name by using the Condition Preview. The Condition Preview area is at the bottom of the Select Condition dialog, as shown in Figure 5-6.

This means that by using row as an index into the array returned from children(), you can build a pointer to a new QObject that you use to build a new index The index is built using the createIndex method available from QAbstractItemModel (see Listing 5-32) In the index method, one assumption was made If the view asks for an invalid index, it gets the root of the tree, which gives the view a way to get started Listing 5-32 The workhorse turning QObjects into indexes QModelIndex ObjectTreeModel::index(int row, int column, const QModelIndex &parent ) const { QObject *parentObject; if( !parentisValid() ) parentObject = m_root; else parentObject = static_cast<QObject*>( parentinternalPointer() ); if( row >= 0 && row < parentObject->children()count() ) return createIndex( row, column, parentObject->children().

In the next chapter, you ll see in more detail how Atlas makes JavaScript much easier. You ll be introduced to the various libraries and how they create and present a unified design and coding framework with ASP.NET server pages. You ll get an overview of the libraries and each of their functions and will learn about details such as the namespaces, inheritance, and various interfaces that these libraries offer you as a developer.

at( row ) ); else return QModelIndex(); } Given the index method, the methods for returning the number of available rows and columns (shown in Listing 5-33) are easy to implement There are always two columns, and the number of rows simply corresponds to the size of the children array Listing 5-33 Calculating the number of rows and returning 2 for the number of columns int ObjectTreeModel::rowCount(const QModelIndex &parent ) const { QObject *parentObject; if( !parentisValid() ) parentObject = m_root; else parentObject = static_cast<QObject*>( parentinternalPointer() );.

On other platforms it is usually located directly in the working directory, so you start it by typing the following: ./testing On all platforms the result is the same: the Hello Qt World! message is printed to the console. The resulting command prompt on the Windows platform is shown in Figure 1-2.

Figure 5-6. Condition Preview section of the Select Condition dialog Using the buttons at the top of the Select Condition dialog, you can create a new condition, edit an existing condition, rename a condition, or delete a condition. Click OK, and the Select Condition dialog box closes. Open the Properties window for the GreaterThan0 branch and notice the ConditionName and Expression properties. The ConditionName property gives the name of the condition that was just created, and the Expression property gives the statement entered as the rule. Figure 5-7 shows the GreaterThan0 property with the Condition expanded.

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