¿Cómo puedo cambiar la forma de una pestaña JTabbedPane?

Estoy tratando de cambiar la forma de las tabs en un JTabbedPane . Usando setTabComponentAt(0, someComponent); no cambia el exterior de la pestaña, que es un rectángulo con una esquina diagonal superior izquierda. ¿Qué se puede hacer para cambiar la forma?

la forma correcta es solo cambiar Look and Feel , buen ejemplo de Old.Java.Forums.Sun

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 import java.awt.BorderLayout; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTabbedPane; import javax.swing.JTextArea; public class TabbedPane extends JPanel { private static final long serialVersionUID = 1L; public TabbedPane() { setLayout(new BorderLayout()); JPanel jp = new JPanel(); jp.setLayout(new BorderLayout()); JTabbedPane tb = new JTabbedPane(); tb.setUI(new CustomTabbedPaneUI()); tb.add("Tab1", new JTextArea("")); tb.add("Tab2", new JTextArea("")); tb.add("Tab3", new JTextArea("")); tb.add("Tab4", new JTextArea("")); tb.add("Tab5", new JTextArea("")); jp.add(tb, BorderLayout.CENTER); add(jp, BorderLayout.CENTER); tb.setEnabledAt(1, false); tb.setEnabledAt(3, false); } public static void main(String[] args) { JFrame frame = new JFrame(); frame.getContentPane().add(new TabbedPane()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(500, 200); frame.setVisible(true); } } 

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 import java.util.*; import java.awt.*; import javax.swing.*; import javax.swing.plaf.*; import javax.swing.plaf.basic.*; import javax.swing.text.View; public class CustomTabbedPaneUI extends BasicTabbedPaneUI { private Color selectColor; private Color deSelectColor; private int inclTab = 4; private int anchoFocoV = inclTab; private int anchoFocoH = 4; private int anchoCarpetas = 18; private Polygon shape; public static ComponentUI createUI(JComponent c) { return new CustomTabbedPaneUI(); } @Override protected void installDefaults() { super.installDefaults(); selectColor = new Color(250, 192, 192); deSelectColor = new Color(197, 193, 168); tabAreaInsets.right = anchoCarpetas; } @Override protected void paintTabArea(Graphics g, int tabPlacement, int selectedIndex) { if (runCount > 1) { int lines[] = new int[runCount]; for (int i = 0; i < runCount; i++) { lines[i] = rects[tabRuns[i]].y + (tabPlacement == TOP ? maxTabHeight : 0); } Arrays.sort(lines); if (tabPlacement == TOP) { int fila = runCount; for (int i = 0; i < lines.length - 1; i++, fila--) { Polygon carp = new Polygon(); carp.addPoint(0, lines[i]); carp.addPoint(tabPane.getWidth() - 2 * fila - 2, lines[i]); carp.addPoint(tabPane.getWidth() - 2 * fila, lines[i] + 3); if (i < lines.length - 2) { carp.addPoint(tabPane.getWidth() - 2 * fila, lines[i + 1]); carp.addPoint(0, lines[i + 1]); } else { carp.addPoint(tabPane.getWidth() - 2 * fila, lines[i] + rects[selectedIndex].height); carp.addPoint(0, lines[i] + rects[selectedIndex].height); } carp.addPoint(0, lines[i]); g.setColor(hazAlfa(fila)); g.fillPolygon(carp); g.setColor(darkShadow.darker()); g.drawPolygon(carp); } } else { int fila = 0; for (int i = 0; i < lines.length - 1; i++, fila++) { Polygon carp = new Polygon(); carp.addPoint(0, lines[i]); carp.addPoint(tabPane.getWidth() - 2 * fila - 1, lines[i]); carp.addPoint(tabPane.getWidth() - 2 * fila - 1, lines[i + 1] - 3); carp.addPoint(tabPane.getWidth() - 2 * fila - 3, lines[i + 1]); carp.addPoint(0, lines[i + 1]); carp.addPoint(0, lines[i]); g.setColor(hazAlfa(fila + 2)); g.fillPolygon(carp); g.setColor(darkShadow.darker()); g.drawPolygon(carp); } } } super.paintTabArea(g, tabPlacement, selectedIndex); } @Override protected void paintTabBackground(Graphics g, int tabPlacement, int tabIndex, int x, int y, int w, int h, boolean isSelected) { Graphics2D g2D = (Graphics2D) g; GradientPaint gradientShadow; int xp[] = null; // Para la forma int yp[] = null; switch (tabPlacement) { case LEFT: xp = new int[]{x, x, x + w, x + w, x}; yp = new int[]{y, y + h - 3, y + h - 3, y, y}; gradientShadow = new GradientPaint(x, y, new Color(100, 100, 255), x, y + h, Color.ORANGE); break; case RIGHT: xp = new int[]{x, x, x + w - 2, x + w - 2, x}; yp = new int[]{y, y + h - 3, y + h - 3, y, y}; gradientShadow = new GradientPaint(x, y, new Color(100, 100, 255), x, y + h, new Color(153, 186, 243)); break; case BOTTOM: xp = new int[]{x, x, x + 3, x + w - inclTab - 6, x + w - inclTab - 2, x + w - inclTab, x + w - 3, x}; yp = new int[]{y, y + h - 3, y + h, y + h, y + h - 1, y + h - 3, y, y}; gradientShadow = new GradientPaint(x, y, new Color(100, 100, 255), x, y + h, Color.BLUE); break; case TOP: default: xp = new int[]{x, x, x + 3, x + w - inclTab - 6, x + w - inclTab - 2, x + w - inclTab, x + w - inclTab, x}; yp = new int[]{y + h, y + 3, y, y, y + 1, y + 3, y + h, y + h}; gradientShadow = new GradientPaint(0, 0, Color.ORANGE, 0, y + h / 2, new Color(240, 255, 210)); break; } // ; shape = new Polygon(xp, yp, xp.length); if (isSelected) { g2D.setColor(selectColor); g2D.setPaint(gradientShadow); } else { if (tabPane.isEnabled() && tabPane.isEnabledAt(tabIndex)) { g2D.setColor(deSelectColor); GradientPaint gradientShadowTmp = new GradientPaint(0, 0, new Color(255, 255, 200), 0, y + h / 2, new Color(240, 255, 210)); g2D.setPaint(gradientShadowTmp); } else { GradientPaint gradientShadowTmp = new GradientPaint(0, 0, new Color(240, 255, 210), 0, y + 15 + h / 2, new Color(204, 204, 204)); g2D.setPaint(gradientShadowTmp); } } //selectColor = new Color(255, 255, 200); //deSelectColor = new Color(240, 255, 210); g2D.fill(shape); if (runCount > 1) { g2D.setColor(hazAlfa(getRunForTab(tabPane.getTabCount(), tabIndex) - 1)); g2D.fill(shape); } g2D.fill(shape); } @Override protected void paintText(Graphics g, int tabPlacement, Font font, FontMetrics metrics, int tabIndex, String title, Rectangle textRect, boolean isSelected) { super.paintText(g, tabPlacement, font, metrics, tabIndex, title, textRect, isSelected); g.setFont(font); View v = getTextViewForTab(tabIndex); if (v != null) { // html v.paint(g, textRect); } else { // plain text int mnemIndex = tabPane.getDisplayedMnemonicIndexAt(tabIndex); if (tabPane.isEnabled() && tabPane.isEnabledAt(tabIndex)) { g.setColor(tabPane.getForegroundAt(tabIndex)); BasicGraphicsUtils.drawStringUnderlineCharAt(g, title, mnemIndex, textRect.x, textRect.y + metrics.getAscent()); } else { // tab disabled g.setColor(Color.BLACK); BasicGraphicsUtils.drawStringUnderlineCharAt(g, title, mnemIndex, textRect.x, textRect.y + metrics.getAscent()); g.setColor(tabPane.getBackgroundAt(tabIndex).darker()); BasicGraphicsUtils.drawStringUnderlineCharAt(g, title, mnemIndex, textRect.x - 1, textRect.y + metrics.getAscent() - 1); } } } /*protected void paintText(Graphics g, int tabPlacement, Font font, FontMetrics metrics, int tabIndex, String title, Rectangle textRect, boolean isSelected) { g.setFont(font); View v = getTextViewForTab(tabIndex); if (v != null) { // html v.paint(g, textRect); } else { // plain text int mnemIndex = tabPane.getDisplayedMnemonicIndexAt(tabIndex); if (tabPane.isEnabled() && tabPane.isEnabledAt(tabIndex)) { Color fg = tabPane.getForegroundAt(tabIndex); if (isSelected && (fg instanceof UIResource)) { Color selectedFG = UIManager.getColor("TabbedPane.selectedForeground"); if (selectedFG != null) { fg = selectedFG; } } g.setColor(fg); SwingUtilities2.drawStringUnderlineCharAt(tabPane, g, title, mnemIndex, textRect.x, textRect.y + metrics.getAscent()); } else { // tab disabled //PAY ATTENTION TO HERE g.setColor(tabPane.getBackgroundAt(tabIndex).brighter()); SwingUtilities2.drawStringUnderlineCharAt(tabPane, g, title, mnemIndex, textRect.x, textRect.y + metrics.getAscent()); g.setColor(tabPane.getBackgroundAt(tabIndex).darker()); SwingUtilities2.drawStringUnderlineCharAt(tabPane, g, title, mnemIndex, textRect.x - 1, textRect.y + metrics.getAscent() - 1); } } }*/ @Override protected int calculateTabWidth(int tabPlacement, int tabIndex, FontMetrics metrics) { return 20 + inclTab + super.calculateTabWidth(tabPlacement, tabIndex, metrics); } @Override protected int calculateTabHeight(int tabPlacement, int tabIndex, int fontHeight) { if (tabPlacement == LEFT || tabPlacement == RIGHT) { return super.calculateTabHeight(tabPlacement, tabIndex, fontHeight); } else { return anchoFocoH + super.calculateTabHeight(tabPlacement, tabIndex, fontHeight); } } @Override protected void paintTabBorder(Graphics g, int tabPlacement, int tabIndex, int x, int y, int w, int h, boolean isSelected) { } @Override protected void paintFocusIndicator(Graphics g, int tabPlacement, Rectangle[] rects, int tabIndex, Rectangle iconRect, Rectangle textRect, boolean isSelected) { if (tabPane.hasFocus() && isSelected) { g.setColor(UIManager.getColor("ScrollBar.thumbShadow")); g.drawPolygon(shape); } } protected Color hazAlfa(int fila) { int alfa = 0; if (fila >= 0) { alfa = 50 + (fila > 7 ? 70 : 10 * fila); } return new Color(0, 0, 0, alfa); } } 

La forma está bajo la égida del delegado UI del panel con tabs, que desciende de TabbedPaneUI . La subclase MetalTabbedPaneUI es un ejemplo que puede ayudarlo a decidir qué tan mal quiere reemplazar al delegado.

Puede poner tags html en el primer parámetro del método addTab de la siguiente manera:

MyJTabbedPane.addTab("

TEST

", new JPanel());