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The previous code would always have links opened in a new window, regardless of any settings that may be in the vardefs. In the same way, you can also define custom field types. Let s say instead of changing the default link template code, you want to define a different type of link field that always defaults to opening the link in a new page. To do this, you could simply create a new directory in the custom/include/ SugarFields/Fields/ directory called Newpagelink, and copy the DetailView.tpl template shown in Listing 3-3 to that directory. Relate, one type of SugarField, is used when specifying a record to relate the current record to. Part of this field is a 'Select' button, which displays a popup window to select the record to relate to. The Popup form you see is also very definable through metadata, as you ll see in the next section.

Occasionally, you need to define a new .NET delegate type in F#: type ControlEventHandler = delegate of int -> bool This is usually required only when using C code from F#, because some magic performed by the .NET Common Language Runtime lets you marshal a delegate value as a C function pointer. 17 looks at interoperating with C and COM. For example, here s how you add a new handler to the Win32 Ctrl+C handling API: open System.Runtime.InteropServices let ctrlSignal = ref false [<DllImport("kernel32.dll")>] extern void SetConsoleCtrlHandler(ControlEventHandler callback,bool add) let ctrlEventHandler = new ControlEventHandler(fun i -> SetConsoleCtrlHandler(ctrlEventHandler,true) ctrlSignal := true; true)

Occasionally, you need to define a new .NET enum type in F#. You do this using a notation similar to discriminated unions:

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To import data values into an Excel workbook, in Excel 2007, click Data, click Get External Data, and then click one of the available commands. In Excel 2003, click Data Import External Data Import Data. Follow the onscreen steps to finish importing the data.

type Vowels = | A = 1 | E = 5 | I = 9 | O = 15 | U = 21 This type is compiled as a .NET enum whose underlying bit representation is a simple integer.

The default view for most modules is the ListView, which provides a listing of records currently in the module. It also has both a basic search for quickly locating records, as well as a more in-depth search form for building more detailed queries, which gives an option to save the search terms for later use. Using the ListView form it is also possible to do mass updates of records with ease (see Listing 3-4). Listing 3-4. Listviewdefs.php for the Calls Module

Summary

To import data values into an Excel workbook, do the following:

This chapter looked at the basic constructs of object-oriented programming in F#, including concrete object types, OO notation, and object interface types and their implementations, as well as more advanced techniques to implement object interface types. You also saw how implementation inheritance is less important as an object implementation technique in F# than in other OO languages and then learned how the F# object model relates to the .NET object model. The next chapter covers language constructs and practical techniques related to encapsulating, packaging, and deploying your code.

$listViewDefs['Calls'] = array( 'SET_COMPLETE' => array( 'width' => '1', 'label' => 'LBL_LIST_CLOSE', 'link' => true, 'sortable' => false, 'default' => true, 'related_fields' => array('status')), 'DIRECTION' => array( 'width' => '10', 'label' => 'LBL_LIST_DIRECTION',

Packaging code and making it available for people and programs to use is a key part of making the best use of F#. In this book, you ve already seen many of the constructs to help do this: functions, objects, type definitions, modules, namespaces, and assemblies. However, in some cases you ve encountered these only peripherally when using the .NET Base Class Library (BCL). This chapter covers these constructs from the perspective of code organization and packaging. Packaging code has four distinct but related meanings: Organizing code into sensible entities using namespaces, types, and modules. Encapsulating internal data structures and implementation details by making them private. Assembling code and data as a component, which on .NET is called an assembly. An assembly is one or more DLL or EXE packaged together with supporting data as a single logical unit. Deploying one or more assemblies, such as a web application or framework, often with an installer, for use on client machines, on web servers, or for download over the Web.

The first two of these topics are associated with the F# language, and the last is more associated with the pragmatics of deploying, installing, configuring, and maintaining software. The third lies in between, because a .NET assembly can act as both a unit of encapsulation and a unit of deployment. Knowing these techniques isn t the same as knowing how to use them effectively, or indeed when to use them. At the end of this chapter, we cover some of the different kinds of .NET software you may write with F# and how you can organize and package your code for these different cases.

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