Bug 294750 [Contributions] Allow a handler to update MUIItems
A handler for a command should be able to update text or tooltips on UIItems that point to the command. ex: in 3.x we have this pattern. 1) each item registers as a UIElement for a command 2) the command service can handle a request to refresh all UIElements for a command 3) changing handlers causes a refresh request 4) the client code can also request a refresh We need a similar story for e4 that would allow the active handler to update the appropriate items. It is a little more complicated in e4 as depending on your location (part of the hierarchy you are requesting from) you will potentially have different handlers applicable to different MUIItems. PW
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/workbench/ui/renderers/swt/ToolItemRenderer.java
ToolItem ti = (ToolItem) me.getWidget();
				ti.addSelectionListener(new SelectionListener() {
					public void widgetSelected(SelectionEvent e) {
						item.setSelected(((ToolItem) e.widget).getSelection());
					}
					public void widgetDefaultSelected(SelectionEvent e) {
						item.setSelected(((ToolItem) e.widget).getSelection());
					}
				});
			}
		}
		
		if (me instanceof MContribution
				&& ((MContribution) me).getURI() != null) {
			final MContribution contrib = (MContribution) me;
			final IEclipseContext lclContext = getContext(me);
			ToolItem ti = (ToolItem) me.getWidget();
			ti.addSelectionListener(new SelectionListener() {
				public void widgetSelected(SelectionEvent e) {
					if (contrib.getObject() == null) {
						IContributionFactory cf = (IContributionFactory) lclContext
								.get(IContributionFactory.class.getName());
						contrib.setObject(cf.create(contrib.getURI(),
								lclContext));
					}
					try {
						ContextInjectionFactory.invoke(contrib.getObject(),
								"execute", lclContext); 
					} catch (InvocationTargetException e1) {
						if (logger != null)