java工具条换行问题解决方案

import java.awt.BorderLayout; import java.awt.Component; import java.awt.Rectangle; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.ComponentAdapter; import java.awt.event.ComponentEvent; import javax.swing.AbstractButton; import javax.swing.ImageIcon; import javax.swing.JPanel; import javax.swing.JPopupMenu; import javax.swing.JSeparator; import javax.swing.JToggleButton; import javax.swing.JToolBar; import javax.swing.event.PopupMenuEvent; import javax.swing.event.PopupMenuListener; public class MoreButton extends JToggleButton implements ActionListener { JToolBar toolbar; private MoreButton(final JToolBar toolbar) { super(new ImageIcon(MoreButton.class.getResource("more.gif"))); this.toolbar = toolbar; addActionListener(this); setFocusPainted(false); // hide & seek toolbar.addComponentListener(new ComponentAdapter() { public void componentResized(ComponentEvent e) { setVisible(!isVisible(toolbar.getComponent(toolbar.getComponentCount() - 1), null)); } }); } // check visibility // partially visible is treated as not visible private boolean isVisible(Component comp, Rectangle rect) { if (rect == null) rect = toolbar.getVisibleRect(); return comp.getLocation().x + comp.getWidth() <= rect.getWidth(); } public void actionPerformed(ActionEvent e) { Component[] comp = toolbar.getComponents(); Rectangle visibleRect = toolbar.getVisibleRect(); for (int i = 0; i < comp.length; i++) { if (!isVisible(comp[i], visibleRect)) { JPopupMenu popup = new JPopupMenu(); for (; i < comp.length; i++) { if (comp[i] instanceof AbstractButton) { AbstractButton button = (AbstractButton) comp[i]; if (button.getAction() != null) popup.add(button.getAction()); } else if (comp[i] instanceof JSeparator) popup.addSeparator(); } //on popup close make more-button unselected popup.addPopupMenuListener(new PopupMenuListener() { public void popupMenuWillBecomeInvisible(PopupMenuEvent e) { setSelected(false); } public void popupMenuCanceled(PopupMenuEvent e) { } public void popupMenuWillBecomeVisible(PopupMenuEvent e) { } }); popup.show(this, 0, getHeight()); } } } public static Component wrapToolBar(JToolBar toolbar) { JToolBar moreToolbar = new JToolBar(); moreToolbar.setRollover(true); moreToolbar.setFloatable(false); moreToolbar.add(new MoreButton(toolbar)); JPanel panel = new JPanel(new BorderLayout()); panel.add(toolbar, BorderLayout.CENTER); panel.add(moreToolbar, BorderLayout.EAST); return panel; } }