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The Pencil tool is the simplest one we re going to create. It will place a small dot wherever you tap the screen, or a continuous squiggly line if you continue to drag your finger around. Make a new NSObject subclass named PencilTool and give it the following content:

You can define validation at the binding level. This gives you the flexibility to use the same validation regardless of the input control. Even better, because you define your validation in a distinct class, you can easily reuse it with multiple bindings that store similar types of data. In general, you ll use the first approach if your data objects already have hardwired validation logic in their property set procedures and you want to take advantage of that logic. You ll use the second approach when you re defining validation logic for the first time and you want to reuse it in different contexts and with different controls. However, some developers choose to use both techniques. They use validation in the data object to defend against a small set of fundamental errors and use validation in the binding to catch a wider set of user-entry errors.

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are established with namespace entries within the markup file. The markup file (.xoml) and the .rules file (if needed by the workflow) are accessed directly by the workflow runtime. This is a major difference from the other authoring modes, which create a workflow instance from a compiled Type.

s Note Validation applies only when a value from the target is being used to update the source in other

Some developers build error checking directly into their data objects. For example, here s a modified version of the Product.UnitPrice property that disallows negative numbers: Public Property UnitCost As Decimal Get Return unitCost End Get Set If value < 0 Then Throw New ArgumentException("UnitCost cannot be negative.") Else unitCost = value OnPropertyChanged(New PropertyChangedEventArgs("UnitCost")) End If End Set End Property The validation logic shown in this example prevents negative price values, but it doesn t give the user any feedback about the problem. As you learned earlier, WPF quietly ignores data binding errors that occur when setting or getting properties. In this case, the user won t have any way of knowing that the update has been rejected. In fact, the incorrect value will remain in the text box it just won t be applied to the bound data object. To improve this situation, you need the help of the ExceptionValidationRule, which is described next.

// PencilTool.h #import <Foundation/Foundation.h> #import "Tool.h" @interface PencilTool : NSObject <Tool> { id <ToolDelegate> delegate;

Note In addition to loading markup files directly at runtime, you can also compile them into a new assembly using the command-line workflow compiler (wfc.exe) or the WorkflowCompiler class. This option is discussed later in this chapter.

Whether or not it s a good approach to place validation logic in a data object is a matter of never-ending debate. This approach has some advantages for example, it catches all errors all the time, whether they occur because of an invalid user edit, a programming mistake, or a calculation that s based on other invalid data. However, this has the disadvantage of making the data objects more complex and moving validation code that s intended for an application s front end deeper into the back-end data model. If applied carelessly, property validation can inadvertently rule out perfectly reasonable uses of the data object. They can also lead to inconsistencies and actually compound data errors. (For example, it might not make sense for the UnitsInStock to hold a value of 10, but if the underlying database stores this value, you might still want to create the corresponding Product object so you can edit it in your user interface.) Sometimes, problems like these are solved by creating yet another layer of objects for example, in a complex system developers might build a rich business object model overtop the bare-bones data object layer. In the current example, the StoreDB and Product classes are designed to be part of a back-end data access component. In this context, the Product class is simply a glorified package that lets you pass information from one layer of code to another. For that reason, validation code really doesn t belong in the Product class.

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