diagramfreeformlayout.java

对eclipse gef进行封装,可以生成图形化编辑器

/*******************************************************************************
 * $Header: /cvsroot/EOS6/work_dir/niegy/com.primeton.studio.gef.ui/src/com/primeton/studio/gef/ui/parts/DiagramFreeformLayout.java,v 1.1 2006/12/12 08:26:39 niegy Exp $
 * $Revision: 1.1 $
 * $Date: 2006/12/12 08:26:39 $
 *
 *==============================================================================
 *
 * Copyright (c) 2001-2006 Primeton Technologies, Ltd.
 * All rights reserved.
 * 
 * Created on 2006-12-12
 *******************************************************************************/


package com.primeton.studio.gef.ui.parts;

import java.util.Iterator;

import org.eclipse.draw2d.FreeformLayout;
import org.eclipse.draw2d.IFigure;
import org.eclipse.draw2d.geometry.Dimension;
import org.eclipse.draw2d.geometry.Point;
import org.eclipse.draw2d.geometry.Rectangle;

/**
 * 编辑器节点排列方式
 *
 * @author niegy (mailto:[e-mail])
 */
/*
 * 修改历史
 * $Log: DiagramFreeformLayout.java,v $
 * Revision 1.1  2006/12/12 08:26:39  niegy
 * 重构代码,实现一般图元的编辑框
 * 
 */
public class DiagramFreeformLayout extends FreeformLayout {
	
	/**
	 * 设置节点图元 Rectangle
	 * @param child
	 */
	public void layoutChild(IFigure child) {
		IFigure parent = child.getParent();
		Point offset = getOrigin(parent);
		IFigure f = child;;
		Rectangle bounds = (Rectangle)getConstraint(f);
		if (bounds == null)
			bounds = new Rectangle(0,0,-1,-1);

		if (bounds.width == -1 || bounds.height == -1) {
			Dimension preferredSize = f.getPreferredSize(bounds.width, bounds.height);
			bounds = bounds.getCopy();
			if (bounds.width == -1)
				bounds.width = preferredSize.width;
			if (bounds.height == -1)
				bounds.height = preferredSize.height;
		}
		bounds = bounds.getTranslated(offset);
		f.setBounds(bounds);

	}
}