TT 7 Views in Java

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TT 7 Views
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id comqualityeclipsefavoritesviewsFavoritesView the unique identifier for this view name Favorites the human readable name for the view displayed in the view s title bar and in the Show View dialog (see Figure 2-20 in Section 2-5)
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The properties view showing the Favorites view attributes
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72 VIEW PART
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The code defining the view s behavior is found in a class implementing the
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orgeclipseuiIViewPart
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interface, typically by subclassing the abstract class
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orgeclipseuipartViewPart
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Section 233 reviewed the Favorites view in its simplest form
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721 View Methods
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createPartControl(Composite)
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required Create the controls
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comprising the view Typically this method simply calls more finely grained methods such as createTable, createSortActions, createFilters, etc (see Section 722)
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dispose()
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Cleanup any platform resources, such as images,
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clipboard, etc, that were created by this class This follows the if you create it you destroy it theme that runs throughout Eclipse
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getAdapter(Class)
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Returns the adapter associated with the
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TT 7 Views
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specified interface so that the view can participate in various workbench actions Adapters returned by views include IShowInSource, IShowInTarget, and IContributedContentsView
among others (see Section 203 for more on
Adapters)
saveState(IMemento)
- Save the local state of this view, such as
the current selection, current sorting, current filter, etc (see Section 751)
setFocus()
required Set focus to the appropriate control
within the view (see Section 722)
722 View Controls Views can contain any type and number of controls, but typically a view such as the Favorites view contains a single table or tree control The Favorites view could use the SWT table widget directly (orgeclipseswtwidgetsTable see Section 4266), but the higher level JFace table viewer (orgeclipsejfaceviewersTableViewer see Section
517) wraps the SWT table widget and is easier to use; it handles much of the underlying grunt work, allowing us to add, select, and remove our model objects directly rather than dealing with the underlying instances of TableItem
With this in mind, we ll start by enhancing the createPartControl( )
method that was generated as part of building the Favorites plug-in (see Section 233) so that the table has three columns The SWTFULL_SELECTION style bit causes the entire row to be highlighted when the user makes a selection Later, when we want to get more involved, we could auto-size the columns in the table (see Section 78)
viewer = new TableViewer(parent, SWTH_SCROLL | SWTV_SCROLL | SWTMULTI | SWTFULL_SELECTION); final Table table = viewergetTable(); TableColumn typeColumn = new TableColumn(table, SWTLEFT); typeColumnsetText(""); typeColumnsetWidth(18); TableColumn nameColumn = new TableColumn(table, SWTLEFT); nameColumnsetText("Name"); nameColumnsetWidth(200); TableColumn locationColumn = new TableColumn(table, SWTLEFT); locationColumnsetText("Location"); locationColumnsetWidth(450); tablesetHeaderVisible(true); tablesetLinesVisible(false);
TT 7 Views
723 View Model A view may have its own internal model such as the Favorites view, or use existing model objects such as an IResource and its subtypes, or not have any model at all In our case, we ll create:
IFavoriteItem an interface used to abstract the differences between different types of favorites objects FavoritesManager holds favorites model objects FavoriteResource a class adapting a resource to the IFavoriteItem interface FavoriteJavaElement a class adapting a java element to the IFavoriteItem interface
The IFavoriteItem interface hides the differences between various types of favorite objects This enables the FavoritesManager and FavoritesView to deal with all favorites items in a uniform manner The naming convention we are following and used in many places throughout Eclipse is to prefix an interface with a capital I so that the interface name is IFavoriteItem rather than FavoriteItem as one would expect
package comqualityeclipsefavoritesmodel; public interface IFavoriteItem { String getName();
void setName(String newName); String getLocation(); boolean isFavoriteFor(Object obj); FavoriteItemType getType(); String getInfo(); static IFavoriteItem[] NONE = new IFavoriteItem[] {}; }
The FavoriteItemType object returned by the getType() method is a type safe enumeration that can be used for sorting and storing favorites and has a human readable name associated with it for display purposes Introducing the FavoriteItemType rather than a simple String or int allows sort order to be separated from the human readable name associated with the type of favorite For now these values are hard coded, but in the future, these values are defined by an extension point so that others could introduce new types of favorites (see Section 173) Later we want to serialize the favorite items so that they can be placed on the clipboard (see Section 737) and saved to disk between Eclipse workbench sessions (see Section 752) To this end, the getInfo() method for each item must return enough state so that the item can be correctly reconstructed later