Bug 282875 [UI] Allow parts of models to be rendered
We need to change the rendering protocol to allow a 'createGui' to specify the container it should be created under (in SWT-land this would be a Composite). This is necessary to facilitate unit tests and to allow the ad-hoc rendering of chunks of a model within an arbitrary container (i.e. a Dialog or Wizard). In order to do this we'll have to make an API change to the PartFactory's 'createWidget' so that it will get the parent container as a parameter. In order to 'upgrade' an existing PartFactory you would simply replace the code you're currently using to find the correct container with the new parameter's value.
bundles/org.eclipse.e4.ui.workbench/src/org/eclipse/e4/workbench/ui/internal/Workbench.java
}
		init();
		return workbench;
	}
	private MApplication<? extends MWindow> loadDefaultModel(URI defaultModelPath) {
		Resource resource = new ResourceSetImpl().getResource(defaultModelPath, true);
		MApplication<MWindow> app = (MApplication<MWindow>) resource.getContents().get(0);
		final EList<MWindow> windows = app.getWindows();
		for (MWindow window : windows) {
			processPartContributions(resource, window);
		}
		return app;
	}
	private void processPartContributions(Resource resource, MWindow mWindow) {
		IExtensionRegistry registry = RegistryFactory.getRegistry();
		String extId = "org.eclipse.e4.workbench.parts"; 
		IConfigurationElement[] parts = registry.getConfigurationElementsFor(extId);
		for (int i = 0; i < parts.length; i++) {
			MContributedPart<?> part = ApplicationFactory.eINSTANCE.createMContributedPart();
			part.setName(parts[i].getAttribute("label")); 
			part.setIconURI("platform:/plugin/" 
					+ parts[i].getContributor().getName() + "/" 
					+ parts[i].getAttribute("icon")); 
			part.setURI("platform:/plugin/" 
					+ parts[i].getContributor().getName() + "/" 
					+ parts[i].getAttribute("class")); 
			String parentId = parts[i].getAttribute("parentId"); 
			MPart parent = (MPart) findObject(resource.getAllContents(), parentId);
			if (parent != null) {
				parent.getChildren().add(part);