flow4jconnectioncreationtool.java

来自「一个java写的business process management系统」· Java 代码 · 共 81 行

/*
 * Copyright (c) 2003, Alexander Greif
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Flow4J-Eclipse project nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

package net.orthanc.flow4j.designer.ui.editors;

import net.orthanc.flow4j.designer.core.Flow4JPlugin;

import org.eclipse.gef.requests.CreationFactory;
import org.eclipse.gef.tools.ConnectionCreationTool;

/**
 * A palette tool for the creation of connections.
 * Has the additional feature, that the default tool is selected if connection tool
 * is activated and the user clicks on a not allowed area.
 * @author alex
 */
public class Flow4JConnectionCreationTool extends ConnectionCreationTool {

	/**
	 * Creates this Tool
	 */
	public Flow4JConnectionCreationTool() {
		super();
	}

	/**
	 * Creates this Tool with the given factory
	 * @param factory the factory to create the parts
	 */
	public Flow4JConnectionCreationTool(CreationFactory factory) {
		super(factory);
	}

	/**
	 * If mouse button down without any creation of a connection or 
	 * without creating the source connection, then the palette's
	 * default tool is selected.
	 * @see org.eclipse.gef.tools.AbstractTool#handleButtonDown(int)
	 */
	protected boolean handleButtonDown(int button) {
		boolean result = super.handleButtonDown(button);
		if (button == 1  &&
			! isInState(STATE_CONNECTION_STARTED) &&
			isInState(STATE_INITIAL)) {
			
			FlowEditor editor = Flow4JPlugin.getActiveFlowEditor();
			if (editor != null) {
				editor.activateDefaultTool();
			}
		}
		return result;
	}

}