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727 Viewer Filters subclasses determine which of the row objects returned by a
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ViewerFilter
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content provider will be displayed and which will not While there can be only one content provider, only one label provider, and only one sorter, there
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TT 7 Views
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can be any number of filters associated with a viewer When there are multiple filters applied, only those items that satisfy all of the applied filters will be displayed Similar to sorting discussed above, the Favorites view can be filtered by name type location
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Eclipse provides the type orgeclipseuiinternalmiscStringMatcher that is ideal for wildcard filtering, but since the class is in an internal package, the first step is to copy the class into the
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comqualityeclipsefavoritesutil
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package Although copying sounds hor-
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rid, there are already ten copies of this particular class in various locations throughout Eclipse, all of them internal (see Section 202 for more on intenal packages and the issues that surround them) Once that is complete, the ViewerFilter for filtering the Favorites view by name looks like this:
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package comqualityeclipsefavoritesviews;
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import orgeclipsejfaceviewers*; import comqualityeclipsefavoritesmodel*; import comqualityeclipsefavoritesutil*; public class FavoritesViewNameFilter extends ViewerFilter { private final StructuredViewer viewer; private String pattern = ""; private StringMatcher matcher; public FavoritesViewNameFilter(StructuredViewer viewer) { thisviewer = viewer; } public String getPattern() { return pattern; } public void setPattern(String newPattern) { boolean filtering = matcher != null; if (newPattern != null && newPatterntrim()length() > 0) { pattern = newPattern; matcher = new StringMatcher(pattern, true, false); if (!filtering) vieweraddFilter(this); else viewerrefresh(); } else { pattern = ""; matcher = null; if (filtering) viewerremoveFilter(this); } } public boolean select( Viewer viewer, Object parentElement, Object element) { return matchermatch( ((IFavoriteItem) element)getName()); }
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728 View Selection Now that the model objects and view controls are in place, other aspects of the view, specifically actions, need a way to determine which favorite items are currently selected Add the following method to the FavoritesView so that actions can perform operations on the selected items
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public IFavoriteItem[] getSelectedFavorites() { IStructuredSelection selection = (IStructuredSelection) viewergetSelection(); IFavoriteItem[] items = new IFavoriteItem[selectionsize()]; Iterator iter = selectioniterator(); int index = 0; while (iterhasNext()) items[index++] = (IFavoriteItem) iternext(); return items; }
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73 VIEW ACTIONS
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A View Action can appear as a menu item in a view s context menu, as a toolbar button on the right side of a view s title bar, and as a menu item in a view s pulldown menu (see Figure 6-9) This Section covers adding an ac-
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tion to a view programmatically whereas Section 64 discussed adding an action using declarations in the plug-in manifest
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731 Model Actions Now that the model objects in place, the AddToFavoritesActionDelegate class introduced in Section 633 can be completed With the modifications outlined below, the action delegate adds the selected items to the FavoritesManager,
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which then notifies the FavoritesViewContentProvider, which then re-
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freshes the table to display the new information
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public void selectionChanged( IAction action, ISelection selection) { thisselection = selection; actionsetEnabled(!selectionisEmpty()); } public void run(IAction action) { if (selection instanceof IStructuredSelection) { FavoritesManager mgr = FavoritesManagergetManager(); Iterator iter = ((IStructuredSelection) selection)iterator(); mgraddFavorites(mgrnewFavoritesFor(iter)); } }
TT 7 Views
732 Context Menu Typically views have context menus populated by actions targeted at the view or the selected objects within the view There are several steps to creating a view s context menu and several more steps to register that view so that others can contribute actions (see Sections 63, 641, and 642 for information concerning how actions are contributed to a view s context menus via the plug-in manifest)
7321 Creating the actions
The first step is to create the actions that appear in the context menu For the Favorites view, we need an action that will remove the selected elements from the view
package comqualityeclipsefavoritesactions; import orgeclipsejfaceaction*; import orgeclipsejfaceviewers*; import comqualityeclipsefavoritesmodel*; public class RemoveFavoritesAction extends Action { private FavoritesView view; public RemoveFavoritesAction( FavoritesView view, String text,
ImageDescriptor imageDescriptor) { super(text, imageDescriptor); thisview = view; } public void run() { FavoritesManagergetManager()removeFavorites( viewgetSelectedFavorites()); } }
In the FavoritesView class, create a new action field:
private RemoveFavoritesAction removeAction;