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public FavoritesLightweightDecorator() { // Make sure that the favorites are loaded managergetFavorites(); manageraddFavoritesManagerListener(this); } public void dispose() { managerremoveFavoritesManagerListener(this); } public void addListener(ILabelProviderListener listener) { if (!listenerListcontains(listener)) listenerListadd(listener); } public void removeListener(ILabelProviderListener listener) { listenerListremove(listener); } public void favoritesChanged(FavoritesManagerEvent favoritesEvent) { Collection elements = new HashSet(); addResourcesTo( favoritesEventgetItemsAdded(), elements); addResourcesTo( favoritesEventgetItemsRemoved(), elements); LabelProviderChangedEvent labelEvent = new LabelProviderChangedEvent( this, elementstoArray()); Iterator iter = listenerListiterator(); while (iterhasNext()) ((ILabelProviderListener) iternext()) labelProviderChanged(labelEvent); } private void addResourcesTo( IFavoriteItem[] items, Collection elements) { for (int i = 0; i < itemslength; i++) { IFavoriteItem item = items[i]; Object res = itemgetAdapter(IResourceclass); if (res != null) elementsadd(res); }
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Label decorators
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} public boolean isLabelProperty( Object element, String property) { return false; }
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Once this behavior is in place, any elements added to the Favorites view will have a small "F" overlay and the suffix "[favorite]" in the Navigator view (see Figure 20-4)
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Decorative label decorators
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If you simply want to decorate the label by adding a static image in one of the quadrants without any text modifications, then you can specify the icon attribute instead of the class attribute If the class attribute is not specified, Eclipse places the image specified by the icon attribute in the quadrant specified by the location attribute In this case, there is no need to create a class that implements ILightweightLabelDecorator because Eclipse provides this behavior for you A read-only file decorator is one example of a decorative label decorator:
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<decorator lightweight="true"
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location="BOTTOM_LEFT" label="Locked" icon="icons/locked_overlaygif" state="true" id="comqualityeclipsefavoriteslocked"> <description> Indicates whether a file is locked </description> <enablement> <and> <objectClass name="orgeclipsecoreresourcesIResource"/> <objectState name="readOnly" value="true"/> </and> </enablement> </decorator>
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With this declaration in the plug-in manifest, a small lock icon appears in the lower left corner of the icon associated with any locked resource (see Figure 20-4)
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Figure 20-4 - Navigator view with Favorites and locked decoration
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Background tasks Jobs API
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208 BACKGROUND TASKS JOBS API
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Long running operations should be executed in the background so that the UI stays responsive One solution is to fork a lower priority thread to perform the operation rather than performing the operation in the UI thread but how do we keep the user informed as to the progress of the background operation Eclipse provides a Jobs API for creating, managing, and displaying background operations In our Favorites product, we want to periodically check availability of a newer version Rather than interrupt the user, we want to perform this check in the background and provided the user with non-intrusive progress information as the operation proceeds To accomplish this, we create NewVersionCheckJob
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(Our goal is exercising the Jobs API not net access, so New-
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VersionCheckJob only simulates a version check):
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package comqualityeclipsefavoritesjobs; import import import import import orgeclipsecoreruntime*; orgeclipsecoreruntimePreferences*; orgeclipsecoreruntimejobs*; comqualityeclipsefavorites*; comqualityeclipsefavoritespreferences*;
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public class NewVersionCheckJob extends Job
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implements IFavoritesPreferences { private NewVersionCheckJob(String name) { super(name); } protected IStatus run(IProgressMonitor monitor) { // simulate check for new version monitorbeginTask("check for new version", 20); for (int i = 20; i > 0; --i) { monitorsubTask("seconds left = " + i); try { Threadsleep(1000); } catch (InterruptedException e) { // ignored } monitorworked(1); } monitordone(); // reschedule job to execute in 2 minutes schedule(120000); return StatusOK_STATUS; } }
The user will control this operation via a new checkbox on the Favorites preference page, so first we add a new constant to the IFavoritesPreferences (see Section 1224):
public static final String FAVORITES_NEW_VERSION_CHECK_PREF = "favoritesnewVersionCheck";
Background tasks Jobs API
Next we expose this new preference on the Favorites preference page by adding a new checkbox This entails a new field plus additional code at the end of the createFieldEditors() method (see Section 1224):
private BooleanFieldEditor newVersionCheckEditor; public void createFieldEditors() { original code here newVersionCheckEditor = new BooleanFieldEditor( FAVORITES_NEW_VERSION_CHECK_PREF, "Periodically check for new version" + " of Favorites product (simulated)", getFieldEditorParent()); addField(newVersionCheckEditor); }
Now we want to tie the new version check job to this preference by adding a preference listener to NewVersionCheckJob The preference listener either schedules or cancels the job depending upon the preference setting as specified by the user:
private static final String JOB_NAME = "Favorites check for new version"; private static NewVersionCheckJob job = null; public boolean shouldSchedule() { return equals(job); } private static final Preferences preferences = FavoritesPlugingetDefault()getPluginPreferences(); private static final PreferencesIPropertyChangeListener propertyListener =