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Any portion of the field containing an empty value should then raise an exception informing the user of which portion of the field was missing a value. Then, if all the values were submitted and were valid, does its real work, returning a value suitable for use in Python when the form is being processed. The exact nature of this return value will depend entirely on the type of field being created, and how it s expected to be used. Consider the following example of a field to accept latitude and longitude coordinates as separate decimals, combining them into a simple tuple.

As you program with Visual Studio, you ll become familiar with its many timesaving conveniences. The following sections outline the most important features you ll use (none of which is new in Visual Studio 2005).

Visual Studio does include one new IntelliSense feature XHTML (Extensible HTML) validation. You ll learn about this feature, and how to control the level of XHTML support you want, in 3.

Outlining allows Visual Studio to collapse a subroutine, block structure, or region to a single line. It allows you to see the code that interests you, while hiding unimportant code. To collapse a portion of code, click the minus box next to the first line. Click the box again (which will now have a plus symbol) to expand it (see Figure 2-16).

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With the field side of things out of the way, the next step is to create a widget that captures both of these elements separately. Since the intended display is simply two text boxes, it makes sense to make the custom widget a simple composite of two widgets, which solves the first challenge of identifying the widgets to be used. The base does a good job of rendering output and retrieving values from the incoming data, so the only challenge left is to convert the single compressed value into a list of values to be rendered by the individual widgets. The counterpart to the field s method is, as you might expect, the widget s method. Its signature is quite similar, taking just a single value, but its task is to split that value into as many pieces as there are widgets to render them. Ordinarily, this would be a matter of taking bits and pieces from a single value and putting them into a sequence, such as a tuple or a list. Since the shown previously outputs its value as a tuple directly, the only thing that s left is to supply a tuple of empty values if none was provided.

Figure 2-16. Collapsing code You can hide any section of code that you want. Simply select the code, right-click the selection, and choose Outlining Hide Selection.

Visual Studio makes it easy for you to interact with controls and classes. When you type a class or object name, Visual Studio pops up a list of available properties and methods (see Figure 2-17). It uses a similar trick to provide a list of data types when you define a variable and to provide a list of valid values when you assign a value to an enumeration. Visual Studio also provides a list of parameters and their data types when you call a method or invoke a constructor. This information is presented in a tooltip above the code and is shown as you type. Because the .NET class library heavily uses function overloading, these methods may have multiple different versions. When they do, Visual Studio indicates the number of versions and allows you to see the method definitions for each one by clicking the small up and down arrows in the tooltip. Each time you click the arrow, the tooltip displays a different version of the overloaded method (see Figure 2-18).

One of the code editor s most useful features is error underlining. Visual Studio is able to detect a variety of error conditions, such as undefined variables, properties, or methods; invalid data type conversions; and missing code elements. Rather than stopping you to alert you that a problem exists, the Visual Studio editor quietly underlines the offending code. You can hover your mouse over an underlined error to see a brief tooltip description of the problem (see Figure 2-19).

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