jtabbedpaneui.java

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package util;

import java.awt.Color;
import java.awt.Container;
import java.awt.Insets;
import java.awt.LayoutManager;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.plaf.basic.BasicTabbedPaneUI;



public class JTabbedPaneUI extends BasicTabbedPaneUI

{

	//override to return our layoutmanager

	protected LayoutManager createLayoutManager()

	{

		return new TestPlafLayout();

	}



	//add 40 to the tab size to allow room for the close button and 8 to the height

	protected Insets getTabInsets(int tabPlacement,int tabIndex)

	{

		//note that the insets that are returned to us are not copies.

		Insets defaultInsets = (Insets)super.getTabInsets(tabPlacement,tabIndex).clone();

		defaultInsets.right += 40;

		defaultInsets.top += 4;

		defaultInsets.bottom += 4;

		return defaultInsets;

	}



	class TestPlafLayout extends TabbedPaneLayout

	{

		//a list of our close buttons

		java.util.ArrayList closeButtons = new java.util.ArrayList();



		public void layoutContainer(Container parent)

		{

			super.layoutContainer(parent);

			//ensure that there are at least as many close buttons as tabs

			while(tabPane.getTabCount() > closeButtons.size())

			{

				closeButtons.add(new CloseButton(closeButtons.size()));

			}

			Rectangle rect = new Rectangle();

			int i;

			for(i = 0; i < tabPane.getTabCount();i++)

			{

				rect = getTabBounds(i,rect);

				JButton closeButton = (JButton)closeButtons.get(i);

				//shift the close button 3 down from the top of the pane and 20 to the left

				closeButton.setLocation(rect.x+rect.width-20,rect.y+5);

				closeButton.setSize(15,15);

				tabPane.add(closeButton);

			}



			for(;i < closeButtons.size();i++)

			{

				//remove any extra close buttons

				tabPane.remove((JButton)closeButtons.get(i));

			}

		}



		// implement UIResource so that when we add this button to the 

		// tabbedpane, it doesn't try to make a tab for it!

		class CloseButton extends JButton implements javax.swing.plaf.UIResource

		{

			public CloseButton(int index)

			{

				super(new CloseButtonAction(index));
                                    setToolTipText("Close this tab");



				//remove the typical padding for the button

				setMargin(new Insets(0,0,0,0));

                                     addMouseListener(new MouseAdapter()

			         {

				       public void mouseEntered(MouseEvent e)

				       {

					     setForeground(new Color(255,0,0));

				        }

				        public void mouseExited(MouseEvent e)

				        {

					     setForeground(new Color(0,0,0));

				         }

			         });

			}

		}



		class CloseButtonAction extends AbstractAction

		{

			int index;

			public CloseButtonAction(int index)

			{

				super("x");

				this.index = index;

			}



			public void actionPerformed(ActionEvent e)

			{

				tabPane.remove(index);

			}

		}	// End of CloseButtonAction

	}	// End of TestPlafLayout

}	// End of static class TestPlafpublic class JTabbledPaneUI {