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Three steps are involved in creating a new view: Define the view category in the plug-in manifest file Define the view in the plug-in manifest file Create the view part containing the code One way to do all this at once is to create the view when the plug-in itself is being created (see Section 223, Define the view, on page 75) If the plug-in already exists, then this becomes a three-step process
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711 Declaring a view category
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First, to define a new view category, edit the plug-in manifest and navigate to the Extensions page Click the Add button to add the orgeclipse uiviews extension if it is not already present (see Figure 7 2) Right-click the orgeclipseuiviews extension and select New > category to add a new category if one does not exist already
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Figure 7 2 The New Extension wizard with the orgeclipseuiviews extension point selected
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CHAPTER 7
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Views
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The properties for this category can be modified in the plug-in manifest editor (see Figure 7 3) For the category containing the Favorites view, the attributes would be as follows: id comqualityeclipsefavorites The unique identifier for the category name QualityEclipse The human-readable name for the category that appears in the Show View dialog (see Figure 2 20 on page 93)
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Figure 7 3 The Plug-in manifest editor showing the Quality Eclipse view category
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When the view category has been defined, right-click again on the orgeclipseuiviews extension in the Extensions page and select New > view to define a new view Use the Extension Element Details section of the editor (see Figure 7 4) to modify the attributes of the view For the Favorites view, the attributes would be as follows: category comqualityeclipsefavorites The unique identifier for the view category that contains this view class comqualityeclipsefavoritesviewsFavoritesView The fully qualified name of the class defining the view and implementing the orgeclipseuiIViewPart interface The class is instantiated using its no argument constructor, but can be parameterized using the IExecutableExtension interface (see Section 215, Types Specified in an Extension Point, on page 793)
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72 View Part
icon icons/samplegif The image displayed in the upper left corner of the view and in the Show View dialog (see Figure 2 20 on page 93) Similar to an action image (see Section 664, Action images, on page 247), this path is relative to the plug-in s installation directory 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 the Show View dialog (see Figure 2 20 on page 93)
Figure 7 4 The Plug-in manifest editor view showing the Favorites view
View Part
The code defining a view s behavior is found in a class implementing the orgeclipseuiIViewPart interface, typically by subclassing the orgeclipseuipartViewPart abstract class Section 233, The Favorites view, on page 84 reviewed the Favorites view in its simplest form
721 View methods
IViewPart and its supertypes define the following methods
createPartControl(Composite) This method is required because it
creates the controls comprising the view Typically, this method simply calls more finely grained methods such as createTable, createSortActions, createFilters, and so on (see the next section)
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CHAPTER 7
Views
dispose() Cleans up any platform resources, such as images, clip-
board, and so on, that were created by this class This follows the if you create it, you destroy it theme that runs throughout Eclipse
getAdapter(Class) Returns the adapter associated with the specified interface so that the view can participate in various workbench behaviors (see below and see Section 213, Adapters, on page 784) saveState(IMemento) Saves the local state of this view, such as the current selection, current sorting, current filter, and so on (see Section 751, Saving local view information, on page 340) setFocus() This method is required because it sets focus to the appropriate control within the view (see the next section)
A view can participate in various workbench behaviors by either directly implementing or having a getAdapater(Class) method that returns an instance of a specific interface A few of these interfaces are listed below: