概要

JTabbedPaneTabTitleをデフォルトに中央揃えから左揃えに変更します。

サンプルコード

class MyTabbedPaneUI extends javax.swing.plaf.metal.MetalTabbedPaneUI {
  @Override protected void layoutLabel(int tabPlacement,
                                       FontMetrics metrics, int tabIndex,
                                       String title, Icon icon,
                                       Rectangle tabRect, Rectangle iconRect,
                                       Rectangle textRect, boolean isSelected ) {
    textRect.x = textRect.y = iconRect.x = iconRect.y = 0;
    //...
    SwingUtilities.layoutCompoundLabel((JComponent) tabPane,
                                       metrics, title, icon,
                                       SwingUtilities.CENTER,
                                       SwingUtilities.LEFT, //CENTER, <----
                                       SwingUtilities.CENTER,
                                       SwingUtilities.TRAILING,
                                       tabRect,
                                       iconRect,
                                       textRect,
                                       textIconGap);
    tabPane.putClientProperty("html", null);
    textRect.translate(tabInsets.left, 0); //<----
    textRect.width -= tabInsets.left + tabInsets.right;
    //...
  }
}
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解説

public ButtonTabComponent(final JTabbedPane pane) {
  //unset default FlowLayout' gaps
  //super(new FlowLayout(FlowLayout.LEFT, 0, 0));
  super(new BorderLayout(0, 0));
  //...
  //add(button);
  add(button, BorderLayout.EAST);
  //...

参考リンク

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