Swing/TranslucentSubMenu のバックアップ(No.1)

TITLE:JMenuなどから開くPopupMenuを半透明化

Posted by aterai at 2012-10-22

JMenuなどから開くPopupMenuを半透明化

JPopupMenuの親のJWindow、JMenuやJMenuItemなどを透明にして、JPopupMenuを半透明にします。

  • &jnlp;
  • &jar;
  • &zip;
TranslucentSubMenu.png

サンプルコード

class TransparentMenu extends JMenu {
  public TransparentMenu(String title) {
    super(title);
  }
  //http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4688783
  private JPopupMenu popupMenu;
  private void ensurePopupMenuCreated() {
    if(popupMenu == null) {
      this.popupMenu = new TranslucentPopupMenu();
      popupMenu.setInvoker(this);
      popupListener = createWinListener(popupMenu);
    }
  }
  @Override public JPopupMenu getPopupMenu() {
    ensurePopupMenuCreated();
    return popupMenu;
  }
  @Override public JMenuItem add(JMenuItem menuItem) {
    ensurePopupMenuCreated();
    menuItem.setOpaque(false);
    return popupMenu.add(menuItem);
  }
  @Override public Component add(Component c) {
    ensurePopupMenuCreated();
    if(c instanceof JComponent) {
      ((JComponent)c).setOpaque(false);
    }
    popupMenu.add(c);
    return c;
  }
  @Override public void addSeparator() {
    ensurePopupMenuCreated();
    popupMenu.addSeparator();
  }
  @Override public void insert(String s, int pos) {
    if(pos < 0) {
      throw new IllegalArgumentException("index less than zero.");
    }
    ensurePopupMenuCreated();
    popupMenu.insert(new JMenuItem(s), pos);
  }
  @Override public JMenuItem insert(JMenuItem mi, int pos) {
    if(pos < 0) {
      throw new IllegalArgumentException("index less than zero.");
    }
    ensurePopupMenuCreated();
    popupMenu.insert(mi, pos);
    return mi;
  }
  @Override public void insertSeparator(int index) {
    if(index < 0) {
      throw new IllegalArgumentException("index less than zero.");
    }
    ensurePopupMenuCreated();
    popupMenu.insert( new JPopupMenu.Separator(), index );
  }
  @Override public boolean isPopupMenuVisible() {
    ensurePopupMenuCreated();
    return popupMenu.isVisible();
  }
}
View in GitHub: Java, Kotlin

解説

上記のサンプルでは、JMenuを継承するTransparentMenuを作成して、自身とJMenuItemなどを透明化し、JMenuから開くJPopupMenuは、JPopupMenuを半透明にするを使用して半透明にしています。

  • JPopupMenuの親の透明化 
PopupFactory.setSharedInstance(new TranslucentPopupFactory());

class TranslucentPopupFactory extends PopupFactory {
  @Override public Popup getPopup(Component owner, Component contents, int x, int y)
                                                   throws IllegalArgumentException {
     return new TranslucentPopup(owner, contents, x, y);
   }
}

参考リンク

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