closabletabbedpane.java

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package com.sshtools.ui.swing;

import java.awt.Component;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.Enumeration;
import java.util.Vector;

import javax.swing.Action;
import javax.swing.Icon;
import javax.swing.JPopupMenu;
import javax.swing.JTabbedPane;

/**
 * An extension of <em>JTabbedPane</em> that renders a close graphic onto
 * each tab.
 *
 * @author $Author: brett $
 * @version $Revision: 1.9 $
 */
public class ClosableTabbedPane extends JTabbedPane implements MouseListener {
  private Vector actions;
  private JPopupMenu popup;

  public ClosableTabbedPane(Icon closeIcon) {
    this.init(null);
  }

  private void init(Icon closeIcon) {
    //
    actions = new Vector();
    addMouseListener(this);
  }

  public void removeAllActions() {
    actions.removeAllElements();
  }

  public void addAction(Action action) {
    if (!actions.contains(action)) {
      actions.add(action);
    }
  }

  public void removeAction(Action action) {
    actions.remove(action);
  }

  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, Component component, int idx) {
      this.insertTab(title, component, null, idx);      
  }

  public void insertTab(String title, Component component, Icon extraIcon, int idx) {
    super.insertTab(title, new CloseTabIcon(extraIcon), component, null, idx);
  }

  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.getPoint())) {
      Component c = (Component) getSelectedComponent();
      if (c != null) {
        if(popup == null) {
          popup = new JPopupMenu("");
        }
        popup.setLabel(getTitleAt(getSelectedIndex()));
        popup.invalidate();
        popup.removeAll();
        Action action;
        for(Enumeration en = actions.elements(); en.hasMoreElements(); ) {
          action = (Action) en.nextElement();
          if(action!=null)
            popup.add(action);
        }
        popup.validate();
        Rectangle r = getUI().getTabBounds(this, tabNumber);
        popup.show(ClosableTabbedPane.this, r.x, r.y + r.height);
      }
    }
  }

  public void mouseEntered(MouseEvent e) {
  }

  public void mouseExited(MouseEvent e) {
  }

  public void mousePressed(MouseEvent e) {
  }

  public void mouseReleased(MouseEvent e) {
  }

  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 = fileIcon == null ? 16 : fileIcon.getIconWidth();
      height = fileIcon == null ? 16 : fileIcon.getIconHeight();
    }

    public void paintIcon(Component c, Graphics g, int x, int y) {
      this.x_pos = x;
      this.y_pos = y;
      if(fileIcon != null) {
        fileIcon.paintIcon(c, g, x, y);
      }
    }

    public int getIconWidth() {
      return width;
    }

    public int getIconHeight() {
      return height;
    }

    public Rectangle getBounds() {
      return new Rectangle(x_pos, y_pos, width, height);
    }
  }
}