/*******************************************************************************
 * 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.examples.logicdesigner.edit;

import java.beans.PropertyChangeEvent;
import java.util.ArrayList;
import java.util.List;

import org.eclipse.swt.SWT;
import org.eclipse.swt.accessibility.AccessibleEvent;

import org.eclipse.draw2d.Animation;
import org.eclipse.draw2d.AutomaticRouter;
import org.eclipse.draw2d.BendpointConnectionRouter;
import org.eclipse.draw2d.ConnectionAnchor;
import org.eclipse.draw2d.ConnectionLayer;
import org.eclipse.draw2d.FanRouter;
import org.eclipse.draw2d.Figure;
import org.eclipse.draw2d.FreeformLayer;
import org.eclipse.draw2d.FreeformLayout;
import org.eclipse.draw2d.IFigure;
import org.eclipse.draw2d.ManhattanConnectionRouter;
import org.eclipse.draw2d.MarginBorder;
import org.eclipse.draw2d.ShortestPathConnectionRouter;
import org.eclipse.draw2d.XYLayout;

import org.eclipse.gef.AccessibleEditPart;
import org.eclipse.gef.CompoundSnapToHelper;
import org.eclipse.gef.ConnectionEditPart;
import org.eclipse.gef.DragTracker;
import org.eclipse.gef.EditPolicy;
import org.eclipse.gef.LayerConstants;
import org.eclipse.gef.Request;
import org.eclipse.gef.SnapToGeometry;
import org.eclipse.gef.SnapToGrid;
import org.eclipse.gef.SnapToGuides;
import org.eclipse.gef.SnapToHelper;
import org.eclipse.gef.editpolicies.RootComponentEditPolicy;
import org.eclipse.gef.editpolicies.SnapFeedbackPolicy;
import org.eclipse.gef.requests.SelectionRequest;
import org.eclipse.gef.rulers.RulerProvider;
import org.eclipse.gef.tools.DeselectAllTracker;
import org.eclipse.gef.tools.MarqueeDragTracker;

import org.eclipse.gef.examples.logicdesigner.LogicMessages;
import org.eclipse.gef.examples.logicdesigner.model.LogicDiagram;

/**
 * Holds all other LogicEditParts under this. It is activated by
 * LogicEditorPart, to hold the entire model. It is sort of a blank board where
 * all other EditParts get added.
 */
public class LogicDiagramEditPart extends LogicContainerEditPart implements
		LayerConstants {

	protected AccessibleEditPart createAccessible() {
		return new AccessibleGraphicalEditPart() {
			public void getName(AccessibleEvent e) {
				e.result = LogicMessages.LogicDiagram_LabelText;
			}
		};
	}

	/**
	 * Installs EditPolicies specific to this.
	 */
	protected void createEditPolicies() {
		super.createEditPolicies();

		installEditPolicy(EditPolicy.NODE_ROLE, null);
		installEditPolicy(EditPolicy.GRAPHICAL_NODE_ROLE, null);
		installEditPolicy(EditPolicy.SELECTION_FEEDBACK_ROLE, null);
		installEditPolicy(EditPolicy.COMPONENT_ROLE,
				new RootComponentEditPolicy());
		installEditPolicy(EditPolicy.LAYOUT_ROLE, new LogicXYLayoutEditPolicy(
				(XYLayout) getContentPane().getLayoutManager()));

		installEditPolicy("Snap Feedback", new SnapFeedbackPolicy()); //$NON-NLS-1$
	}

	/**
	 * Returns a Figure to represent this.
	 * 
	 * @return Figure.
	 */
	protected IFigure createFigure() {
		Figure f = new FreeformLayer();
		// f.setBorder(new GroupBoxBorder("Diagram"));
		f.setLayoutManager(new FreeformLayout());
		f.setBorder(new MarginBorder(5));
		return f;
	}

	/**
	 * @see org.eclipse.core.runtime.IAdaptable#getAdapter(java.lang.Class)
	 */
	public Object getAdapter(Class adapter) {
		if (adapter == SnapToHelper.class) {
			List snapStrategies = new ArrayList();
			Boolean val = (Boolean) getViewer().getProperty(
					RulerProvider.PROPERTY_RULER_VISIBILITY);
			if (val != null && val.booleanValue())
				snapStrategies.add(new SnapToGuides(this));
			val = (Boolean) getViewer().getProperty(
					SnapToGeometry.PROPERTY_SNAP_ENABLED);
			if (val != null && val.booleanValue())
				snapStrategies.add(new SnapToGeometry(this));
			val = (Boolean) getViewer().getProperty(
					SnapToGrid.PROPERTY_GRID_ENABLED);
			if (val != null && val.booleanValue())
				snapStrategies.add(new SnapToGrid(this));

			if (snapStrategies.size() == 0)
				return null;
			if (snapStrategies.size() == 1)
				return snapStrategies.get(0);

			SnapToHelper ss[] = new SnapToHelper[snapStrategies.size()];
			for (int i = 0; i < snapStrategies.size(); i++)
				ss[i] = (SnapToHelper) snapStrategies.get(i);
			return new CompoundSnapToHelper(ss);
		}
		return super.getAdapter(adapter);
	}

	public DragTracker getDragTracker(Request req) {
		if (req instanceof SelectionRequest
				&& ((SelectionRequest) req).getLastButtonPressed() == 3)
			return new DeselectAllTracker(this);
		return new MarqueeDragTracker();
	}

	/**
	 * Returns <code>NULL</code> as it does not hold any connections.
	 * 
	 * @return ConnectionAnchor
	 */
	public ConnectionAnchor getSourceConnectionAnchor(
			ConnectionEditPart editPart) {
		return null;
	}

	/**
	 * Returns <code>NULL</code> as it does not hold any connections.
	 * 
	 * @return ConnectionAnchor
	 */
	public ConnectionAnchor getSourceConnectionAnchor(int x, int y) {
		return null;
	}

	/**
	 * Returns <code>NULL</code> as it does not hold any connections.
	 * 
	 * @return ConnectionAnchor
	 */
	public ConnectionAnchor getTargetConnectionAnchor(
			ConnectionEditPart editPart) {
		return null;
	}

	/**
	 * Returns <code>NULL</code> as it does not hold any connections.
	 * 
	 * @return ConnectionAnchor
	 */
	public ConnectionAnchor getTargetConnectionAnchor(int x, int y) {
		return null;
	}

	public void propertyChange(PropertyChangeEvent evt) {
		if (LogicDiagram.ID_ROUTER.equals(evt.getPropertyName()))
			refreshVisuals();
		else
			super.propertyChange(evt);
	}

	protected void refreshVisuals() {
		Animation.markBegin();
		ConnectionLayer cLayer = (ConnectionLayer) getLayer(CONNECTION_LAYER);
		if ((getViewer().getControl().getStyle() & SWT.MIRRORED) == 0)
			cLayer.setAntialias(SWT.ON);

		if (getLogicDiagram().getConnectionRouter().equals(
				LogicDiagram.ROUTER_MANUAL)) {
			AutomaticRouter router = new FanRouter();
			router.setNextRouter(new BendpointConnectionRouter());
			cLayer.setConnectionRouter(router);
		} else if (getLogicDiagram().getConnectionRouter().equals(
				LogicDiagram.ROUTER_MANHATTAN))
			cLayer.setConnectionRouter(new ManhattanConnectionRouter());
		else
			cLayer.setConnectionRouter(new ShortestPathConnectionRouter(
					getFigure()));
		Animation.run(400);
	}

}