Here you can find the source of addMenuItem(final JMenuItem mi, final C topLevelMenu, final List
static public <C extends JComponent & MenuElement> JMenuItem addMenuItem(final JMenuItem mi, final C topLevelMenu, final List<String> path) throws IllegalArgumentException
//package com.java2s; /*//www . j a v a 2 s. c om * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. * * Copyright 2011 OpenConcerto, by ILM Informatique. All rights reserved. * * The contents of this file are subject to the terms of the GNU General Public License Version 3 * only ("GPL"). You may not use this file except in compliance with the License. You can obtain a * copy of the License at http://www.gnu.org/licenses/gpl-3.0.html See the License for the specific * language governing permissions and limitations under the License. * * When distributing the software, include this License Header Notice in each file. */ import java.awt.Component; import java.awt.Container; import java.util.Arrays; import java.util.List; import javax.swing.Action; import javax.swing.JComponent; import javax.swing.JMenu; import javax.swing.JMenuItem; import javax.swing.JSeparator; import javax.swing.MenuElement; public class Main { private static final String GROUPNAME_PROPNAME = "GROUPNAME"; private static final String DEFAULT_GROUPNAME = "defaultGroupName"; static public <C extends JComponent & MenuElement> JMenuItem addMenuItem(final Action action, final C topLevelMenu) throws IllegalArgumentException { return addMenuItem(action, topLevelMenu, (String) null); } static public <C extends JComponent & MenuElement> JMenuItem addMenuItem(final Action action, final C topLevelMenu, final String... path) throws IllegalArgumentException { return addMenuItem(action, topLevelMenu, Arrays.asList(path)); } /** * Adds a menu item to the passed menu. The path should be an alternation of group and menu * within that menu. All items within the same group will be grouped together inside separators. * Menus will be created as needed and groups' names can be <code>null</code>. NOTE: items added * with this method (even with null groups) will always be separated from items added directly. * * @param action the action to perform. * @param topLevelMenu where to add the menu item. * @param path where to add the menu item. * @return the newly created item. * @throws IllegalArgumentException if path length is not odd. */ static public <C extends JComponent & MenuElement> JMenuItem addMenuItem(final Action action, final C topLevelMenu, final List<String> path) throws IllegalArgumentException { return addMenuItem(new JMenuItem(action), topLevelMenu, path); } static public <C extends JComponent & MenuElement> JMenuItem addMenuItem(final JMenuItem mi, final C topLevelMenu, final List<String> path) throws IllegalArgumentException { if (path.size() == 0 || path.size() % 2 == 0) throw new IllegalArgumentException("Path should be of the form group/menu/group/... : " + path); JComponent menu = topLevelMenu; for (int i = 0; i < path.size() - 1; i += 2) { final String groupName = path.get(i); final String menuName = path.get(i + 1); menu = addChild(menu, groupName, new JMenu(menuName), JMenu.class, false); } final String actionGroupName = path.get(path.size() - 1); return addChild(menu, actionGroupName, mi, JMenuItem.class, true); } static private <T extends JMenuItem> T addChild(final Container c, String groupName, final T created, final Class<T> clazz, final boolean alwaysAdd) { if (groupName == null) groupName = DEFAULT_GROUPNAME; final Component[] children = getChildren(c); final int[] groupRange = getRange(children, groupName); final T res; if (groupRange == null) { if (children.length > 0) { if (c instanceof JMenu) { ((JMenu) c).addSeparator(); } else { c.add(new JSeparator()); } } res = created; c.add(res); } else { final T existingChild = alwaysAdd ? null : findChild(children, groupRange, created.getText(), clazz); if (existingChild != null) { res = existingChild; } else { res = created; // add after the last of the group (groupRange[1] is exclusive) // from Container.addImpl() index can be equal to count() to add at the end c.add(res, groupRange[1]); } } res.putClientProperty(GROUPNAME_PROPNAME, groupName); return res; } static private Component[] getChildren(final Container c) { return c instanceof JMenu ? ((JMenu) c).getMenuComponents() : c.getComponents(); } static private int[] getRange(final Component[] children, String groupName) { int min = -1; int max = -1; for (int i = 0; i < children.length; i++) { if (groupName.equals(((JComponent) children[i]).getClientProperty(GROUPNAME_PROPNAME))) { if (min < 0) min = i; if (max < i) max = i; } } // inclusive, exclusive return min == -1 ? null : new int[] { min, max + 1 }; } /** * Find a child with the passed class and text. * * @param <T> type of child * @param c the parent. * @param name the text of the child. * @param clazz the class of the child. * @return the child found or <code>null</code>. */ static public <T extends JMenuItem> T findChild(final Container c, final String name, Class<T> clazz) { return findChild(getChildren(c), null, name, clazz); } static private <T extends JMenuItem> T findChild(final Component[] children, int[] range, final String name, Class<T> clazz) { if (range == null) range = new int[] { 0, children.length }; for (int groupIndex = range[0]; groupIndex < range[1]; groupIndex++) { final Component child = children[groupIndex]; if (clazz == child.getClass()) { final T casted = clazz.cast(child); if (name.equals(casted.getText())) { return casted; } } } return null; } }