Bug 167325 [Viewers]ViewerCell and ViewerRow should provide API to find neighbors
This is a very important feature if we want provide keyboard features in tables and trees and the current EditingSupport has TODO items to make this work in a clear way. I'd propose the following new API functions for ViewerCell: - ViewerCell#getCellLeft() - ViewerCell#getCellRight() - ViewerCell#getCellTop() - ViewerCell#getCellBottom() - ViewerRow#getRowTop() - ViewerRow#getRowBottom() What I'm not 100% sure is if we should provide functions to navigate Tree-Structures: - ViewerCell#getCellTop(boolean samelevel) - ViewerCell#getCellBottom(boolean samelevel) - ViewerRow#getRowTop(boolean samelevel) - ViewerRow#getRowBottom(boolean samelevel)
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/ViewerRow.java
*/
	protected ViewerRow(final Item item) {
		item.setData(ViewerRow.ROWPART_KEY, this);
	}
	/**
	 * Get the bounds of the entry at the columnIndex,
	 * 
	 * @param columnIndex
	 * @return {@link Rectangle}
	 */
	public abstract Rectangle getBounds(int columnIndex);
	/**
	 * Return the bounds for the whole item.
	 * 
	 * @return {@link Rectangle}
	 */
	public abstract Rectangle getBounds();
	/**
	 * Return the item for the receiver.
	 * 
	 * @return {@link Item}
	 */
	public abstract Item getItem();
	/**
	 * Return the number of columns for the receiver.
	 * 
	 * @return int
	 */
	public abstract int getColumnCount();
	/**