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The data delivered from models usually comes unsorted, but you can enable sorting by implementing the sort method of your model. If you are using a tree view or table view to show your model, you can enable the user to click headers to sort by setting the property sortingEnabled to true. As long as you use the QStandardItemModel model and stick to the types handled by QVariant, the sorting will work right away. However, you are bound to run into situations in which you do not want to change the model to perform the sorting. This is where proxy models enter the picture. A proxy model is a model that wraps another class in itself, transforms it, and takes its place. The wrapped model is usually called the source model. All actions performed on the proxy model are forwarded to the source model, and all changes in the source model are propagated to the proxy model. To implement a proxy model, start from the QAbstractProxyModel class (if you want to sort or filter a model, use the QSortFilterProxyModel class). To get started, let s provide custom sorting through a proxy model. Before you start implementing the proxy model , you might want to have a look at the main function shown in Listing 5-44. The main function shows that the proxy model, sorter, is inserted between the source model (model) and the view (table). The source model is assigned to the proxy model by using the setSourceModel(QAbstractItemModel*) method. Then the proxy is used as model in the view instead of using the source directly.

<validationErrorLabel targetElement="validator1" associatedControl="value1TextBox" /> <label targetElement="value1Label"> <bindings> <binding dataContext="value1TextBox" dataPath="text" property="text" /> </bindings> </label> </components> </page> </script> Most of this will look familiar, but you haven t seen a couple of new elements in here. First, a <textBox> control points to value1TextBox, which as you will see from the HTML is the <input> control. A new child element called <validators> is attached to this element. The <validators> tag can contain a number of validators that can be rangeValidator, requiredFieldValidator, typeValidator, rangeValidator, or regexValidator, among others. In this case, you are using a requiredFieldValidator, which fires an error if the field on which the validator is configured is empty. You specify the error message using the errorMessage attribute. A validation error needs to have a source on the page that it uses to represent the error to the user, or it will not be seen. In this example, you have a <span> that contains an asterisk that appears when an error occurs. To achieve this, you use the <validationErrorLabel> tag and associate it with this span. The span is called validator1, so the validationErrorLabel is given this as its targetElement. Finally, this validationErrorLabel needs to be tied to the control that it is the error message destination for, and you achieve this with the associatedControl attribute. Figure 5-11 shows this page after a validation error has been hit. You can see the red asterisk and the tooltip that appears when the user hovers over it. Note that you didn t have to write any code to make this asterisk appear or disappear, and you don t have to write explicit code for the tooltip. The Atlas framework handles all of this for you!

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Figure 5-9. All files within Solution Explorer for Workflow1 Notice the file called Workflow1.rules. This is the rules file that contains any rules for this workflow. Double-click the file to open it. You ll see that the file is XML. You can find the conditions embedded in the XML file by looking for the RuleExpressionCondition tag: <RuleExpressionCondition Name="Condition1">

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