Bug 84314 [Viewers] Need to allow mapping elements to multiple widgets/items
One of the projects I am working on is using an essentially graph structured dependancy model and we use TableTreeViewer for browsing (drilling down) through this graph. The nature of the model is such that the same model element can occur in multiple positions (paths) of the three. Current implementation of the TreeViewer and TableTreeViewer do not support such one-to-many mapping of model elements to widgets, leading to loads of unnecessary overhead to enshure that correct items will get updated. Suggestion: Element -> Item mapper should allow returning of more than one item per model element that is associated with this element.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TableViewer.java
Object element = filtered[i];
			int index = indexForElement(element);
			createItem(element, index);
		}
	}
	/**
	 * Create a new TableItem at index if required.
	 * @param element
	 * @param index
	 * 
	 * @since 3.1
	 */
	private void createItem(Object element, int index) {
		if(virtualManager == null)
			updateItem(new TableItem(getTable(), SWT.NONE, index), element);
		else{
			virtualManager.notVisibleAdded(element,index);
			
		}
	}
	/**
	 * Adds the given element to this table viewer. If this viewer does not have
	 * a sorter, the element is added at the end; otherwise the element is
	 * inserted at the appropriate position.
	 * <p>
	 * This method should be called (by the content provider) when a single
	 * element has been added to the model, in order to cause the viewer to
	 * accurately reflect the model. This method only affects the viewer, not
	 * the model. Note that there is another method for efficiently processing
	 * the simultaneous addition of multiple elements.