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Understanding the Object Model
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A well-thought-out object model in an application is what separates applications with good AppleScript support from those with not-so-good AppleScript support. Even though most applications have some sort of internal object model where all the application s data is held, it takes a good amount of effort on the behalf of the development team to translate this object model into an AppleScript object model. Although different applications have different types of objects (the Finder has files and folders, Adobe InDesign has pages and text frames, and so on), most applications object models follow the same overall structure: a top-level application object that contains a number of objects, some of which contain other objects . . . and so on.
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CHAPTER 22 UNDERSTANDING THE FUNDAMENTALS OF AUTOMATING APPLICATIONS
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To understand this structure, imagine a large office building. The building is divided into floors, each floor is divided into offices, and an office may have desks and people in it. Every object has a specific address that anyone in the building can use to find it. For instance, the receptionist s desk is the third office on the second floor. The office also has a name, Reception, so another way you could identify it would be by saying the office named Reception on the second floor. Figure 22-4 can help you visualize it.
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Figure 22-4. The office building described as an object model The following mocked-up dictionary shows the dictionary-style listing of the classes illustrated in Figure 22-4: class building Elements floor -- by index class floor Elements office -- by index, name class office Properties name : string -- the office name Elements desk -- by index person by index, name [etc...]
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CHAPTER 22 UNDERSTANDING THE FUNDAMENTALS OF AUTOMATING APPLICATIONS
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Notice that you were able to identify the desired office using two methods: by its position and by its name. Locating objects in order to script them is the first order of the day. Scriptable applications use a similar method of addressing their objects: the Finder has disks that can contain files and folders. Folders can have files or more folders. In InDesign, you have a document that contains pages. The pages may contain, among other things, text frames that can contain words and characters. In FileMaker Pro, you have a database that can have tables with fields and records. Addressing the objects in these applications is also similar to the building example: in the Finder you can refer to the file report.txt in the third folder of the disk Server; in InDesign you can refer to the fifth text frame on page 2 of the document Annual Report.indd, and in FileMaker Pro you can talk to cell Last Name of record 5 of table Contact of database 1. All are different types of objects, but the way each object model works is pretty much the same. On top of addressing, each object in an application has three other sides to it. An object consists of the DNA of a specific class; an object can have properties that describe the object such as size, name, and so on; and an object can have elements. Elements are the objects that the object in question contains. In scripting dictionaries, classes (object definitions) are listed separately from commands, and they are also structured a bit differently. Every class shows a little description followed by the list of other classes that may be elements (see the Elements section later in this chapter). The list of elements is followed by a list of properties.
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Classes
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A class is what defines how an object should behave. Every object is the product of a class. In nature, we are all objects derived from the human class. When we are born, we get human traits such as an upright posture and a disposition toward talking too much. When you create an object, say, a document in InDesign, this document is an instance of the document class, and it takes all its characteristics from that class. Classes can also have subclasses. The Finder, for instance, has a superclass called item. This item class has subclasses such as files, folders, and disks. Each of these subclasses inherits all the traits of the item class and then adds some of its own. For instance, the file subclass has a file type property, but the folder subclass doesn t.
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