package forumPackage;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
/**
* 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 GUI_JTabbedPaneWithCloseIcons extends JTabbedPane implements
MouseListener {
public GUI_JTabbedPaneWithCloseIcons() {
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 addTabWithoutCloseIcon(String title, Component component) {
super.addTab(title, component);
}
public void mouseClicked(MouseEvent e) {
try {
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);
}
} catch (NullPointerException ex) {
System.out
.println("Gewöhnliche Nullpointer-Exception, tritt auf bei Tab ohne Close-Icon");
}
}
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 = null;
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);
if (fileIcon != null) {
fileIcon.paintIcon(c, g, x + width, y_p);
}
g.setColor(col);
}
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);
}
}
