WmvcApp Class in Java

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Recall the definition of a framework at the beginning of this chapter One of the goals of a framework, even a simple one, is to make it easier for a programmer to develop an application that requires the services of the framework In this case, the goal of our simple framework is to make it easier to develop a Swing GUI application that uses the MVC design We will begin by considering what services the framework must include to build a "standard" GUI application as described in "Graphical User Interfaces" on page 118 Such a standard app included an outer frame that contained a title bar, a menu bar, a tool bar, and a drawing area that could be used for views The existing Swing JFrame class almost meets these requirements, so we will define a top-level application class based on JFrame Most frameworks have a name, and we'll call our framework the Wmvc framework for the Wampler MVC framework All classes in this framework will be start with Wmvc This kind of naming convention is commonly used with frameworks and libraries
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The top-level application class is called WmvcApp A user application will derive its toplevel application class from WmvcApp The basic structure of the Wmvc framework is shown in Figure 5-10 The class diagram for WmvcApp shows the most important services it provides WmvcApp allows the user app class to build an application easily The app will define the elements of the menu bar, tool bar, and drawing panes The user app defines menus by creating JMenu objects, and then adding items to those menus using the Wmvc menu controllers, and finally adding the menus to the menu bar with WmvcAppaddMenu Tool bar items are defined and added to the tool bar using Wmvc controller objects WmvcApp provides a JPanel for the app to define whatever is needed for views WmvcApp provides the basic functionality needed to build simple "standard" applications Although it is not that complicated, it simplifies the job of the programmer The details of defining a tool bar and a JPanel are hidden WmvcApp has another job - to support the MVC model While the structure of an MVC program is clear, the MVC structure must really hang off of something In the Wmvc framework, the WmvcApp class provides the foundation to build the MVC structure on Because all the views must access the model, WmvcApp provides the services setModel() and getModel() to give them access to the model It provides a class method to get access to the WmvcApp object itself WmvcApp does not provide direct support for views Instead, views are created in the derived WmvcApp class directly The Thermometer example later will help make this clear The details of creating the tool bar and drawing canvas are found in the WmvcAppjava code In addition to the services already discussed, WmvcApp provides a standard way to
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handle closing an application When the user presses the close button on the title bar, the method appClosing is called, and will exit by default The user app can control closing behavior by overriding appClosing There is a method to cause the app window to be displayed after it has been defined (showApp()) Since the programmer must derive an app class from WmvcApp, it has been declared abstract
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Figure 5-10 Wmvc framework
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UML: We've introduced the note symbol in Figure 5-10 It is used to show notes
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that help explain the diagram Note how UML diagrams don't have to give all the details Sometimes they are used to show just the overall relationships between classes, and don't show any details of the attributes or operations Other times, they can show only relevant operations And finally, they can be used to show the full details, including all attributes and operations
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