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Listing 5-44. The source model is assigned to the proxy model that is then used by the view instead of using the source model directly. int main( int argc, char **argv ) { QApplication app( argc, argv ); QStringListModel model; QStringList list; list << "Totte" << "Alfons" << "Laban" << "Bamse" << "Skalman"; model.setStringList( list ); SortOnSecondModel sorter; sorter.setSourceModel( &model ); QTableView table; table.setModel( &sorter ); table.setSortingEnabled( true ); table.show(); return app.exec(); } If you want to provide custom sorting through a class inheriting QSortFilterProxyModel, you need to override the lessThan(const QModelIndex&, const QModelIndex&) method. The proxy class itself is very simple all it takes is a constructor and the overriding method. The example sorter proxy model ignores the first letter of strings before sorting them alphabetically. The class is called SortOnSecondModel, and the declaration is shown in Listing 5-45. Listing 5-45. The class declaration of the custom sorting proxy model class SortOnSecondModel : public QSortFilterProxyModel { public: SortOnSecondModel( QObject *parent = 0 ); protected: bool lessThan( const QModelIndex &left, const QModelIndex &right ) const; }; The constructor of SortOnSecondModel is simple; it just passes the parent object onto the constructor of the base class. The code of the class is contained in the lessThan method shown in Listing 5-46.

Listing 5-46. The lessThan method ignores the first character of strings before comparing them. bool SortOnSecondModel::lessThan( const QModelIndex &left, const QModelIndex &right ) const { QString leftString = sourceModel()->data( left ).toString(); QString rightString = sourceModel()->data( right ).toString();

In the previous example, you checked to see whether a field was present in your validation rules. This is useful, but for more serious applications, more sophisticated validation is necessary. In this example, you will see what is involved in applying multiple validation rules to a control to not only validate whether you have entered something into it but also to check the data type to ensure you have put in a numeric value and to check that the numeric value falls within a specific range. You can see the page in Figure 5-12.

if( !leftString.isEmpty() ) leftString = leftString.mid( 1 );

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The first part of the condition, the operator, is spelled out in the OperatorExpression tag. This tag, in this case, is called CodeBinaryOperatorExpression because of the type of operator used. The tag begins with <ns0:CodeBinaryOperatorExpression Operator="GreaterThan": <ns0:CodeBinaryOperatorExpression Operator="GreaterThan" xmlns:ns0="clrnamespace:System.CodeDom;Assembly=System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"> This shows the operator for this condition and goes on to provide specifics about its type to the .NET Framework. The next tag of interest is the CodeFieldReferenceExpression tag. This tag provides the name of the item being referenced by the condition, in this case IntValue: <ns0:CodeFieldReferenceExpression FieldName="IntValue"> Finally, the CodePrimitiveExpression.Value tag provides the value the condition uses to compare against: <ns0:CodePrimitiveExpression.Value> <ns1:Int32 xmlns:ns1="clr-namespace:System;Assembly=mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">0</ns1:Int32> <ns0:CodePrimitiveExpression.Value> This rules file is the reason using rules for conditions of IfElse activities is a better way to set conditions. Going back to the original example, if the order-entry business rules change so that special credit checks are done for orders over $5,000 instead of $1,000, you could open this file and change the CodePrimitiveExpression.Value tag to accomplish this rule change. You could perform this change on the fly while the workflow is being executed. Any workflow instance that hadn t yet executed the IfElse activity would use the new condition value. If you used the CodeCondition condition type, the workflow would need to be stopped, the CodeCondition criteria within the IfElse activity changed, and the workflow started again. Before leaving this topic, I ll provide a list of the operators that can be used within a Rules condition (see Table 5-1).

if( !rightString.isEmpty() ) rightString = rightstring.mid( 1 ); return leftString < rightString; } In the method, you use the sourceModel() method to get a reference to the source model and you get the actual data to compare from it. Before comparing the strings, the first letter, if any, is truncated from the left and right strings. Figure 5-12 shows the application running with the source model sorted according to the proxy model s sort order.

Figure 5-12. Compound validation To understand how this compound validation works, let s inspect the code. The HTML is identical to that used in the previous example, so you ll skip straight to the Atlas Script that manages the compound validation: <script type="text/xml-script"> <page xmlns:script="http://schemas.microsoft.com/xml-script/2005"> <components> <textBox targetElement="value1TextBox"> <validators> <requiredFieldValidator errorMessage="You must enter a number." /> <typeValidator type="Number" errorMessage="You must enter a valid number." /> <rangeValidator lowerBound="10" upperBound="20" errorMessage="You must enter a number between 10 and 20." /> </validators> </textBox> <validationErrorLabel targetElement="validator1" associatedControl="value1TextBox" /> <label targetElement="value1Label"> <bindings> <binding dataContext="value1TextBox" dataPath="text" property="text" />

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