Figure 6-8 MovieCat UML for design in Java

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What about the edit view One choice would have been to use the item view for the editor as well One problem with this approach is that it is too easy for the user to accidentally make changes A better design is to have the editor as a separate popup dialog The layout of the dialog is similar to the item view, but uses editable components so the user can change or create a movie entry The editor dialog is invoked by the Edit button in the item view, or by the Add Movie button on the tool bar There are synonyms for these commands in the Menu Figure 6-7 shows the MovieCat movie editor dialog
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Figure 6-7 MovieCat Edit Dialog Because we are using Wmvc and Swing, the design of the view classes is a matter of selecting the appropriate Swing components to implement the required functionality that has been specified The MVC design architecture will dictate the logical structure of the views We won't show detailed UML diagrams of the view classes The Wmvc framework requires one more class, the main app class We will call the class MovieCat, and its main purpose is to create the model and the views Its design is really dictated by the Wmvc framework One of the advantages of using a framework, even a small one like Wmvc, is that it can really simplify the design Wmvc defines a specific framework based on MVC, and provides some basic Swing building blocks The basic Wmvc architecture makes the design of the views, main app, and even the model much simpler than it might have been with a design from scratch Once we designed the MovieModel class, it was not difficult to design the views Putting It All Together We now have all the parts of MovieCat designed Figure 6-8 has a UML class diagram for
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the full MovieCat application, but without the Wmvc details The UML shows how all the parts fit and interact with each other
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Figure 6-8 MovieCat UML for design
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Implementation of MovieCat
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Now that we have the design of MovieCat, we can write the code The following listings1 show the complete implementation of the MovieCat application Each listing is introduced by a short description of the class MovieCat Class We will start with the main MovieCat class It isn't always easy to know what order to examine source code in, but it is often good to start with the main application class MovieCatjava is the top level app class derived from WmvcApp This class has the main method that gets things rolling It creates the parts of the app in the MovieCat constructor After creating the MovieModel object, the constructor creates the three views Finally, it creates a JSplitPane with two JScrollPanes to hold the MovieListView and MovieItemView views The JSplitPane is then added to the MainPane provided by Wmvc The last thing the MovieCat class does is to call showApp, which causes the GUI to be displayed, and the Java event loop thread to start
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Listing 6-1 MovieCatjava
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MovieCat main app class
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/* MovieCat - A simple Movie Catalog Application * Copyright (c) 2001, Bruce E Wampler */ import javaawt*; import javaxswing*; public class MovieCat extends WmvcApp { private MainView mainView; private MovieListView listView; private MovieItemView itemView; public MovieCat(String name) { super(name, true, true); // constructor // Create with menu, toolbar
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// **** First, create the model setModel( (WmvcModel) new MovieModel() ); // **** Next, create the view/controllers mainView = new MainView(); // won't use any panels listView = new MovieListView(); // list view for left itemView = new MovieItemView(); // item view for right // **** Create a split pane, add list and item views JScrollPane listPane = new JScrollPane(listViewgetPanel()); JScrollPane itemPane = new JScrollPane(itemViewgetPanel()); JSplitPane splitPane = new JSplitPane(JSplitPaneHORIZONTAL_SPLIT, listPane, itemPane); splitPanesetOneTouchExpandable(true); // details splitPanesetDividerLocation(200); Dimension minimumSize = new Dimension(100, 50); listPanesetMinimumSize(minimumSize); itemPanesetMinimumSize(minimumSize);
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