| /******************************************************************************* |
| * Copyright (c) 2004, 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.ui.actions; |
| |
| import java.util.Arrays; |
| |
| import org.eclipse.jface.action.Action; |
| |
| import org.eclipse.gef.EditPart; |
| import org.eclipse.gef.EditPartViewer; |
| import org.eclipse.gef.internal.GEFMessages; |
| import org.eclipse.gef.internal.ui.rulers.GuideEditPart; |
| import org.eclipse.gef.internal.ui.rulers.RulerEditPart; |
| import org.eclipse.gef.rulers.RulerProvider; |
| |
| /** |
| * An Action that creates a guide on a ruler and reveals it. |
| * |
| * @author Pratik Shah |
| * @since 3.0 |
| */ |
| public class CreateGuideAction extends Action { |
| |
| private EditPartViewer viewer; |
| |
| /** |
| * Constructor |
| * |
| * @param ruler |
| * the viewer for the ruler on which the guide is to be created |
| */ |
| public CreateGuideAction(EditPartViewer ruler) { |
| super(GEFMessages.Create_Guide_Label); |
| viewer = ruler; |
| setToolTipText(GEFMessages.Create_Guide_Tooltip); |
| } |
| |
| /** |
| * @see org.eclipse.jface.action.IAction#run() |
| */ |
| public void run() { |
| RulerProvider provider = ((RulerEditPart) viewer.getRootEditPart() |
| .getChildren().get(0)).getRulerProvider(); |
| |
| // Determine where the guide should be created |
| int[] positions = provider.getGuidePositions(); |
| Arrays.sort(positions); |
| int index = 0; |
| int newPosition = GuideEditPart.MIN_DISTANCE_BW_GUIDES + 1; |
| int desiredDifference = (GuideEditPart.MIN_DISTANCE_BW_GUIDES * 2) + 1; |
| boolean found = positions.length > 0 |
| && positions[0] > desiredDifference; |
| while (index < positions.length - 1 && !found) { |
| if (positions[index + 1] - positions[index] > desiredDifference) { |
| newPosition += positions[index]; |
| found = true; |
| } |
| index++; |
| } |
| if (!found && positions.length > 0) |
| newPosition += positions[positions.length - 1]; |
| |
| // Create the guide and reveal it |
| viewer.getEditDomain().getCommandStack() |
| .execute(provider.getCreateGuideCommand(newPosition)); |
| viewer.reveal((EditPart) viewer.getEditPartRegistry().get( |
| provider.getGuideAt(newPosition))); |
| } |
| |
| } |