/*******************************************************************************
 * Copyright (c) 2000, 2010 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.gef;

/**
 * The constants used to identify typical layers in a graphical application.
 */
public interface LayerConstants {

	/**
	 * Identifies the layer containing the primary pieces of the application.
	 */
	String PRIMARY_LAYER = "Primary Layer"; //$NON-NLS-1$

	/**
	 * Identifies the layer containing connections, which typically appear on
	 * top of anything in the primary layer.
	 */
	String CONNECTION_LAYER = "Connection Layer"; //$NON-NLS-1$

	/**
	 * Identifies the layer where the grid is painted.
	 */
	String GRID_LAYER = "Grid Layer"; //$NON-NLS-1$

	/**
	 * Identifies the layer where Guides add feedback to the primary viewer.
	 */
	String GUIDE_LAYER = "Guide Layer"; //$NON-NLS-1$

	/**
	 * Identifies the layer containing handles, which are typically editing
	 * decorations that appear on top of any model representations.
	 */
	String HANDLE_LAYER = "Handle Layer"; //$NON-NLS-1$

	/**
	 * The layer containing feedback, which are generally temporary visuals that
	 * appear on top of all other visuals.
	 */
	String FEEDBACK_LAYER = "Feedback Layer"; //$NON-NLS-1$

	/**
	 * The layer containing scaled feedback.
	 */
	String SCALED_FEEDBACK_LAYER = "Scaled Feedback Layer"; //$NON-NLS-1$

	/**
	 * The layer that contains all printable layers.
	 */
	String PRINTABLE_LAYERS = "Printable Layers"; //$NON-NLS-1$

	/**
	 * The layer that contains all scaled layers.
	 */
	String SCALABLE_LAYERS = "Scalable Layers"; //$NON-NLS-1$

}
