ButtonTabComponent.java

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//http://docs.oracle.com/javase/tutorial/uiswing/examples/components/TabC
omponentsDemoProject/src/components/ButtonTabComponent.java
package gerenciador;
import
import
import
import
javax.swing.*;
javax.swing.plaf.basic.BasicButtonUI;
java.awt.*;
java.awt.event.*;
public class ButtonTabComponent extends JPanel {
private static final long serialVersionUID = 1L;
private final JTabbedPane pane;
// CONSTRUTOR
// Início...
public ButtonTabComponent(final JTabbedPane pane) {
// unset default FlowLayout' gaps
super(new FlowLayout(FlowLayout.LEFT, 0, 0));
if (pane == null) {
throw new NullPointerException("TabbedPane is null");
}
this.pane = pane;
setOpaque(false);
// faz a JLabel ler o título do JTabbedPane
JLabel label = new JLabel() {
private static final long serialVersionUID = 1L;
public String getText() {
int i =
pane.indexOfTabComponent(ButtonTabComponent.this);
if (i != -1) {
return pane.getTitleAt(i);
}
return null;
}
};
add(label);
// adiciona mais espaço entre a label e o botão
label.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 5));
// tab button
JButton button = new TabButton();
add(button);
// adiciona mais espaço para o topo do componente
setBorder(BorderFactory.createEmptyBorder(2, 0, 0, 0));
}// Fim do construtor.
//
// CLASSE TABBUTTON
//
// Define as características do botão fechar.
//
// Início
private class TabButton extends JButton implements ActionListener {
private static final long serialVersionUID = 1L;
public TabButton() {
int size = 17;
setPreferredSize(new Dimension(size, size));
setToolTipText("Fechar esta aba");
setCursor(new Cursor(Cursor.HAND_CURSOR));
// Faz o botão ser igual para todas as Laf's
setUI(new BasicButtonUI());
// Torna-o transparente
setContentAreaFilled(false);
// Não necessidade de estar com focusable
setFocusable(false);
setBorder(BorderFactory.createEtchedBorder());
setBorderPainted(false);
// Fazendo um efeito de rolagem
// usamos o mesmo listener para todos os botões
addMouseListener(buttonMouseListener);
setRolloverEnabled(true);
// Fecha a guia apropriada, clicando no botão
addActionListener(this);
}
public void actionPerformed(ActionEvent e) {
int i = pane.indexOfTabComponent(ButtonTabComponent.this);
if (i != -1) {
pane.remove(i);
}
}
// pinta o X
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g.create();
// mudança na imagem para botões pressionados
if (getModel().isPressed()) {
g2.translate(1, 1);
}
g2.setStroke(new BasicStroke(2));
g2.setColor(Color.RED);
if (getModel().isRollover()) {
g2.setColor(Color.RED);
}
int delta = 6;
g2.drawLine(delta, delta, getWidth() - delta - 1, getHeight()
- delta - 1);
g2.drawLine(getWidth() - delta - 1, delta, delta, getHeight()
- delta - 1);
g2.dispose();
}
}// Fim da classe TabButton.
//
// MOUSELISTENER
//
// Define os eventos de entrada e saida do mouse.
//
// Início...
private final static MouseListener buttonMouseListener = new
MouseAdapter() {
public void mouseEntered(MouseEvent e) {
Component component = e.getComponent();
if (component instanceof AbstractButton) {
AbstractButton button = (AbstractButton) component;
button.setBorderPainted(true);
}
}
public void mouseExited(MouseEvent e) {
Component component = e.getComponent();
if (component instanceof AbstractButton) {
AbstractButton button = (AbstractButton) component;
button.setBorderPainted(false);
}
}
};// Fim dos Listeners.
}