Bug 82240 [Viewers] Need a content provider for tables that gets elements lazily
Currently all of our viewers assume that all of the elements are avialble. In the case of a virtual table we also want to be able to load elements as they become visible rather than all at once (common issue for databases). Here are some of the issues 1) Need to setItemCount on the table from the content provider 2) Need a getElements(start,finish) method on the content provider 3) Need to decide how to handle staleness. If there are a million items and the viewer just sits there scrolled to the bottom that is a million TableItems and a million Objects represented. How do we manage memory for this?
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TableViewer.java
fontProvider = (ITableFontProvider) provider;
			if(provider instanceof ITableColorProvider)
				colorProvider = (ITableColorProvider) provider;
		}
		
		/**
		 * Create an instance of the receiver with no color and font
		 * providers.
		 */
		public TableColorAndFontCollector(){
		}
		
		/**
		 * Set the fonts and colors for the tableItem if there is a color
		 * and font provider available.
		 * @param tableItem The item to update.
		 * @param element The element being represented
		 * @param column The column index
		 */
		public void setFontsAndColors(TableItem tableItem, Object element, int column){
			if (colorProvider != null) {
				tableItem.setBackground(column, colorProvider.getBackground(element,
						column));
				tableItem.setForeground(column, colorProvider.getForeground(element,
						column));
			}
			if(fontProvider != null)
				tableItem.setFont(column,fontProvider.getFont(element,column));
		}