JTabbedPane添加关闭按钮和缩略图 .

/*

* Arjick@163.com

*

*/

package exec;

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.awt.geom.AffineTransform;

import java.util.ArrayList;

import java.util.HashMap;

/**

* A JTabbedPane which has a close ('X') icon on each tab.

* To add a tab, use the method addTab(String, Component)

* To have an extra icon on each tab (e.g. like in JBuilder,

* showing the file type) use the method

* addTab(String, Component, Icon).

* Only clicking the 'X' closes the tab. */

public class JClosableTabbedPane extends JTabbedPane implements MouseListener {

private double scaleRatio = 0.3;

private HashMap<String, Component> maps = new HashMap<String, Component>();

public JClosableTabbedPane() {

super();

addMouseListener(this);

}

public void addTab(String title, Component component) {

this.addTab(title, component, null);

}

public void addTab(String title, Component component, Icon extraIcon) {

super.addTab(title, new CloseTabIcon(extraIcon), component);

}

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 = 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 = 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<JComponent> dbcomponents = new ArrayList<JComponent>();

updateDoubleBuffered(jcomponent, dbcomponents);

jcomponent.paint(g);

resetDoubleBuffered(dbcomponents);

g2d.setTransform(at);

}

}

private void updateDoubleBuffered(JComponent component, ArrayList<JComponent> 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<JComponent> dbcomponents) {

for (JComponent component : dbcomponents) {

component.setDoubleBuffered(true);

}

}

}

public double getScaleRatio() {

return scaleRatio;

}

public void setScaleRatio(double scaleRatio) {

this.scaleRatio = scaleRatio;

}

public void mouseClicked(MouseEvent e) {

int tabNumber = getUI().tabForCoordinate(this, e.getX(), e.getY());

if (tabNumber < 0) {

return;

}

Rectangle rect = ((CloseTabIcon) getIconAt(tabNumber)).getBounds();

if (rect.contains(e.getX(), e.getY())) {

//the tab is being closed

this.removeTabAt(tabNumber);

}

}

public void mouseEntered(MouseEvent e) {

}

public void mouseExited(MouseEvent e) {

}

public void mousePressed(MouseEvent e) {

}

public void mouseReleased(MouseEvent e) {

}

}

/**

* The class which generates the 'X' icon for the tabs. The constructor

* accepts an icon which is extra to the 'X' icon, so you can have tabs

* like in JBuilder. This value is null if no extra icon is required.

*/

class CloseTabIcon implements Icon {

private int x_pos;

private int y_pos;

private int width;

private int height;

private Icon fileIcon;

public CloseTabIcon(Icon fileIcon) {

this.fileIcon = fileIcon;

width = 16;

height = 16;

}

public void paintIcon(Component c, Graphics g, int x, int y) {

this.x_pos = x;

this.y_pos = y;

Color col = g.getColor();

g.setColor(Color.black);

int y_p = y + 2;

g.drawLine(x + 1, y_p, x + 12, y_p);

g.drawLine(x + 1, y_p + 13, x + 12, y_p + 13);

g.drawLine(x, y_p + 1, x, y_p + 12);

g.drawLine(x + 13, y_p + 1, x + 13, y_p + 12);

g.drawLine(x + 3, y_p + 3, x + 10, y_p + 10);

g.drawLine(x + 3, y_p + 4, x + 9, y_p + 10);

g.drawLine(x + 4, y_p + 3, x + 10, y_p + 9);

g.drawLine(x + 10, y_p + 3, x + 3, y_p + 10);

g.drawLine(x + 10, y_p + 4, x + 4, y_p + 10);

g.drawLine(x + 9, y_p + 3, x + 3, y_p + 9);

g.setColor(col);

if (fileIcon != null) {

fileIcon.paintIcon(c, g, x + width, y_p);

}

}

public int getIconWidth() {

return width + (fileIcon != null ? fileIcon.getIconWidth() : 0);

}

public int getIconHeight() {

return height;

}

public Rectangle getBounds() {

return new Rectangle(x_pos, y_pos, width, height);

}

/*public static void main(String args[]) {

try {

UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());

}

catch (Exception e) {

e.printStackTrace();

}

JClosableTabbedPane pane = new JClosableTabbedPane();

ImageIcon icon = new ImageIcon("images/middle.jpg");

pane.addTab("tab1",new JButton("first Button"),icon);

pane.addTab("tab2",new JButton("sec Button"),icon);

pane.addTab("tab3",new JButton("third Button"),icon);

pane.addTab("tab4",new JButton("fourth Button"),icon);

JFrame frame = new JFrame("Demo");

frame.getContentPane().add(pane,BorderLayout.CENTER);

frame.setSize(500,300);

frame.setLocation(300,200);

frame.show();

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}*/

}