Bug 296728 [CommonNavigator] Problem with enablement on navigatorContent extension point
If I use the enablement node with the expression "WITH", no variable was found because no real context is given. example : <extension point="org.eclipse.ui.navigator.navigatorContent"> <commonWizard type="new" wizardId="com.mywizard"> <enablement> <with variable="activeWorkbenchWindow.activePerspective"> <equals value="com.myperpective"> </equals> </with> </enablement> </commonWizard> make this error : org.eclipse.core.runtime.CoreException: The variable activeWorkbenchWindow.activePerspective is not defined at org.eclipse.core.internal.expressions.WithExpression.evaluate(WithExpression.java:65) at org.eclipse.core.internal.expressions.CompositeExpression.evaluateAnd(CompositeExpression.java:53) at org.eclipse.core.internal.expressions.EnablementExpression.evaluate(EnablementExpression.java:53) at org.eclipse.ui.internal.navigator.wizards.CommonWizardDescriptor.isEnabledFor(CommonWizardDescriptor.java:145) at org.eclipse.ui.internal.navigator.wizards.CommonWizardDescriptorManager.getEnabledCommonWizardDescriptors(CommonWizardDescriptorManager.java:158) at org.eclipse.ui.navigator.WizardActionGroup.setContext(WizardActionGroup.java:193) at org.eclipse.ui.internal.navigator.resources.actions.NewActionProvider.fillContextMenu(NewActionProvider.java:107) You could do use the currentState of the IEvaluationService. (see WorkbenchWindow line 3035)
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/dnd/CommonDropAdapterDescriptor.java
INavigatorContentExtPtConstants {
	private final IConfigurationElement element;
	private final INavigatorContentDescriptor contentDescriptor;
	private Expression dropExpr;
	CommonDropAdapterDescriptor(
			IConfigurationElement aConfigElement,
			INavigatorContentDescriptor aContentDescriptor) {
		element = aConfigElement;
		contentDescriptor = aContentDescriptor;
		init();
	}
	private void init() {
		IConfigurationElement[] children = element.getChildren(TAG_POSSIBLE_DROP_TARGETS);
		if (children.length == 1) {
			dropExpr = new CustomAndExpression(children[0]);
		}
	}
	/**
	 * 
	 * @param anElement
	 *            The element from the set of elements being dragged.
	 * @return True if the element matches the drag expression from the
	 *         extension.
	 */
	public boolean isDragElementSupported(Object anElement) {