ImageToolTipTabbedPanel.java

package org.infosec.ismp.applet.manager.component.panel.utils;

import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.util.ArrayList;
import java.util.HashMap;

import javax.swing.Icon;
import javax.swing.JComponent;
import javax.swing.JTabbedPane;
import javax.swing.JToolTip;


/**
 * 带图像tooltip的tabbedpanel
 */
public class ImageToolTipTabbedPanel extends JTabbedPane {
	private double scaleRatio = 0.25;
	private HashMap maps = new HashMap();

	public void insertTab(String title, Icon icon, Component component, String tip, int index) {
		tip = "tab" + component.hashCode();
		maps.put(tip, component);
		super.insertTab(title, icon, component, tip, index);
	}

	public void removeTabAt(int index) {
		Component component = getComponentAt(index);
		maps.remove("tab" + component.hashCode());
		super.removeTabAt(index);
	}

	public JToolTip createToolTip() {
		ImageToolTip tooltip = new ImageToolTip();
		tooltip.setComponent(this);
		return tooltip;
	}

	class ImageToolTip extends JToolTip {
		public Dimension getPreferredSize() {
			String tip = getTipText();
			Component component = (Component) maps.get(tip);
			if (component != null)
				return new Dimension((int) (getScaleRatio() * component.getWidth()), (int) (getScaleRatio() * component.getHeight()));
			else
				return super.getPreferredSize();
		}

		public void paintComponent(Graphics g) {
			String tip = getTipText();
			Component component = (Component) maps.get(tip);
			if (component instanceof JComponent) {
				JComponent jcomponent = (JComponent) component;
				Graphics2D g2d = (Graphics2D) g;
				AffineTransform at = g2d.getTransform();
				g2d.transform(AffineTransform.getScaleInstance(getScaleRatio(), getScaleRatio()));
				ArrayList dbcomponents = new ArrayList();
				//这儿采用递归的方式将组件树上的所有组件都禁止掉双缓冲
				//属性，并且将这些组件放在一个数组中，以备恢复用
				updateDoubleBuffered(jcomponent, dbcomponents);
				jcomponent.paint(g);
				resetDoubleBuffered(dbcomponents);
				g2d.setTransform(at);
			}
		}

		private void updateDoubleBuffered(JComponent component, ArrayList dbcomponents) {
			if (component.isDoubleBuffered()) {
				dbcomponents.add(component);
				component.setDoubleBuffered(false);
			}
			for (int i = 0; i < component.getComponentCount(); i++) {
				Component c = component.getComponent(i);
				if (c instanceof JComponent)
					updateDoubleBuffered((JComponent) c, dbcomponents);
			}
		}

		private void resetDoubleBuffered(ArrayList dbcomponents) {
			int size = dbcomponents.size();
			for (int i = 0; i < size; i++) {
				JComponent component = (JComponent) dbcomponents.get(i);
				component.setDoubleBuffered(true);
			}
		}

	}

	public double getScaleRatio() {
		return scaleRatio;
	}

	public void setScaleRatio(double scaleRatio) {
		this.scaleRatio = scaleRatio;
	}

}