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Buttons and menus allow you to bring your application to life by calling business service methods and application navigation. In this chapter you have learned that: Buttons and menus allow you to initiate actions through the Action or ActionListener properties. Some components have facets specifically for menus and toolbars. Toolbars and toolboxes can be used to help manage the layout of buttons and menus.

The main challenge in both writing and understanding the script is understanding the different list variables. The script will create and handle four list variables: master_file_list types_of_files_in_master_list unique_types_list list_of_file_lists I ll go over the different lists this script creates and manipulates, explaining each one in turn. The first list is master_file_list. This is simply a list where each item is the name of a file in the chosen folder. The number of items then will be the same as the number of files in the folder. The list types_of_files_in_master_list will be a parallel list to master_file_list. It ll have the same number of items, but in this list, each item will have a file type. The two lists correspond in that if you take the same item number, one list will contain a file s name, and the other list will contain the file s type. Synchronized lists such as this are a simple way to build database functionality for use at runtime. Figure 6-12 shows the two lists side by side. The windows you re looking at are taken from Late Night Software s Script Debugger, which has some great views of lists, records, and other compound values.

Figure 6-12. Comparing the lists master_file_list and types_of_files_in_master_list In this script you use two separate lists to hold related filename and type data. Another option is to keep related values together by creating a single list of records, where each record holds both the name and type for one file. You ll look at records in the Working with Records section of this chapter. So what is unique_types_list responsible for doing The unique_types_list variable holds a list that will have a single item for each unique file type. Since the folder I chose contains files of four different types, the unique_types_list list will contain four items by the end. These three list variables collect their values in the first repeat loop (line 9 to line 17). Line 19 introduces a new list variable: list_of_file_lists. This list will have as many items as unique_types_list. Each of the items will be a list in itself, containing the names of the files whose file type is equal to the corresponding item in the unique_types_list variable. Figure 6-13 illustrates how the script is designed with corresponding lists.

Figure 6-13 The synchronization between the unique_types_list and list_of_file_lists variables A key to understanding the structure shown previously is that AppleScript isn t aware of any link between the two lists, and it isn t responsible for maintaining their synchronicity This job is up to you, and it takes planning and confidence; because you are unleashing your script to gather together two separate lists, you are expecting these two lists to match up with each other! From line 20 to line 31 you actually have a double repeat loop The outer loop loops through the list of unique file types The inner loop loops through the entire master_file_list What happens in the loop is that the type from the type list, which is assigned in line 21 to the variable unique_file_type, is compared with the type of the file, which is assigned in line 25 to the variable the_file_type.

Now that you have an understanding of some basic ADF Faces components, task flows, buttons, and menus, your application should really start to take shape. The next step is to look at some of the more advanced features of ADF Faces and how you can use them to enhance your application.