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The reason I m making a distinction between command handlers and event handlers is to indicate their different purposes when discussing them. That is, all these handlers work in the same basic way, but how you use them is different: When I say event, I m talking about a message sent by an application s GUI to its internal script to let it know the user has just done something interesting (clicked a button, selected a menu item, and so on). When I say command or subroutine call, I m talking about a message sent by a script demanding that a specific operation be performed (make a new document, sort a list, and so on). Similarly, an event handler is a handler written to respond to a particular kind of event, whereas a command handler or subroutine is a handler written to carry out a specific command. Making this mental distinction between commands and events is an important part of writing GUI applications where so much of an application s behavior relies on being triggered by various events especially since the timing and order in which events might (or might not) occur can greatly vary depending on how users interact with the application s interface. Whether you re using FaceSpan or AppleScript Studio, this sort of event-driven programming is quite a change from writing simple step-by-step processing scripts that run, perform a specific sequence of operations, and quit when done. But once you get used to this new way of thinking, it can be great fun to do and allows you to produce sophisticated applications with rich user interaction and a professional look and feel.

Properties are where the relationship between a class of objects and the objects themselves becomes clear While a class defines all the properties that all objects of that class have, the objects themselves have something the class doesn t: values For example, in the Finder you have the file class That class has a property called creator type The class, however, is not an actual file; it s only the definition of what a file object s structure looks like On the other hand, a file on the hard disk is a real file, and the creator type property of the object that represents that file actually has a value, which tells you the creator type of that particular file; for example, a value of ttxt would tell you the file was a TextEdit document Object properties are much like people properties.

The declarative component has now been added to the project and is available in the Component Palette just like all the other ADF Faces components. TIP If you have trouble locating the component, you can use the search feature of the Component Palette or, from the drop-down list, select the tag library in which you placed the component.

We all share the same set of properties in the class human; it s just that the values are different for each of us For instance, we all have a height property Each one of us has a weight property that we can give to the nurse at our annual checkup This number is recorded, and then you are told whether you need to lose some weight! In AppleScript, object properties are used in similar ways Let s look at the files in the Finder window In the script, you can pinpoint the file you want to deal with and inspect its properties You figure out that the size property of the file is 2MB You write that in your script in a variable and later use it to do something useful You can see which object properties AppleScript has access to in two ways.

One is the application s AppleScript dictionary, and the other is getting the value of an object s properties property, if it s available..

When you browse the dictionary in OS X 10.4 s Script Editor, you start by clicking a suite name at the left column of the top section, which should reveal all the classes and/or commands defined in that suite. From there, you can click any items from the middle column; classes are marked with the letter C in a purple square background, and commands are marked with a C in a blue circle. After selecting one class (or Shift-clicking to select several), you will then see the elements and properties of the classes you clicked, one after the other in the bottom section of the dictionary viewer. (Remember, class is another word for object type, so a class defines all the properties and elements of all the objects that belong to that class.) Figure 2-14 shows the FileMaker Pro 7 dictionary in Script Editor.