selectablelabel.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/figure/SelectableLabel.java,v 1.1 2006/11/22 07:07:38 niegy Exp $
 * $Revision: 1.1 $
 * $Date: 2006/11/22 07:07:38 $
 *
 *==============================================================================
 *
 * Copyright (c) 2001-2006 Primeton Technologies, Ltd.
 * All rights reserved.
 * 
 * Created on 2006-11-21
 *******************************************************************************/


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

import org.eclipse.draw2d.ColorConstants;
import org.eclipse.draw2d.Graphics;
import org.eclipse.draw2d.Label;
import org.eclipse.draw2d.geometry.Insets;
import org.eclipse.draw2d.geometry.Rectangle;

/**
 * TODO 此处填写 class 信息
 *
 * @author niegy (mailto:[e-mail])
 */
/*
 * 修改历史
 * $Log: SelectableLabel.java,v $
 * Revision 1.1  2006/11/22 07:07:38  niegy
 * 增加table
 * 
 */
public class SelectableLabel extends Label {
	private boolean selected;
	private boolean hasFocus;

	private Rectangle getSelectionRectangle() {
		Rectangle bounds = getTextBounds();
		bounds.expand(new Insets(2,2,0,0));
		translateToParent(bounds);
		bounds.intersect(getBounds());
		return bounds;
	}

	/**
	 * @see org.eclipse.draw2d.Label#paintFigure(org.eclipse.draw2d.Graphics)
	 */
	protected void paintFigure(Graphics graphics) {
		if (selected) {
			graphics.pushState();
			graphics.setBackgroundColor(ColorConstants.menuBackgroundSelected);
			graphics.fillRectangle(getSelectionRectangle());
			graphics.popState();
			graphics.setForegroundColor(ColorConstants.white);
		}
		if (hasFocus) {
			graphics.pushState();
			graphics.setXORMode(true);
			graphics.setForegroundColor(ColorConstants.menuBackgroundSelected);
			graphics.setBackgroundColor(ColorConstants.white);
			graphics.drawFocus(getSelectionRectangle().resize(-1, -1));
			graphics.popState();
		}
		super.paintFigure(graphics);
	}

	/**
	 * Sets the selection state of this SimpleActivityLabel
	 * @param b true will cause the label to appear selected
	 */
	public void setSelected(boolean b) {
		if (selected != b) {
			selected = b;
			repaint();
		}
	}

	/**
	 * Sets the focus state of this SimpleActivityLabel
	 * @param b true will cause a focus rectangle to be drawn around the text of the Label
	 */
	public void setFocus(boolean b) {
		if (hasFocus != b) {
			hasFocus = b;
			repaint();
		}
	}
}