1 // Copyright 2007 Google Inc. All Rights Reserved. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); You may not 4 // use this file except in compliance with the License. You may obtain a copy of 5 // the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by 6 // applicable law or agreed to in writing, software distributed under the 7 // License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS 8 // OF ANY KIND, either express or implied. See the License for the specific 9 // language governing permissions and limitations under the License. 10 11 package com.google.scrollview.ui; 12 13 import com.google.scrollview.events.SVEventType; 14 import com.google.scrollview.ui.SVWindow; 15 16 import java.awt.event.ActionEvent; 17 import java.awt.event.ActionListener; 18 import java.util.HashMap; 19 20 import javax.swing.JMenu; 21 import javax.swing.JMenuBar; 22 23 /** 24 * The SVMenuBar class provides the functionality to add a menubar to 25 * ScrollView. Each menubar item gets associated with a (client-defined) 26 * command-id, which SVMenuBar will return upon clicking it. 27 * 28 * @author wanke@google.com 29 * 30 */ 31 public class SVMenuBar implements ActionListener { 32 /** The root entry to add items to. */ 33 private JMenuBar root; 34 /** Contains a map of item name to its actual entry. */ 35 private HashMap<String, SVAbstractMenuItem> items; 36 /** The window the menubar belongs to. */ 37 private SVWindow svWindow; 38 39 /** 40 * Create a new SVMenuBar and place it at the top of the ScrollView window. 41 * 42 * @param scrollView The window our menubar belongs to. 43 */ SVMenuBar(SVWindow scrollView)44 public SVMenuBar(SVWindow scrollView) { 45 root = new JMenuBar(); 46 svWindow = scrollView; 47 items = new HashMap<String, SVAbstractMenuItem>(); 48 svWindow.setJMenuBar(root); 49 } 50 51 52 /** 53 * A click on one of the items in our menubar has occured. Forward it 54 * to the item itself to let it decide what happens. 55 */ actionPerformed(ActionEvent e)56 public void actionPerformed(ActionEvent e) { 57 // Get the corresponding menuitem. 58 SVAbstractMenuItem svm = items.get(e.getActionCommand()); 59 60 svm.performAction(svWindow, SVEventType.SVET_MENU); 61 } 62 63 /** 64 * Add a new entry to the menubar. 65 * 66 * @param parent The menu we add our new entry to (should have been defined 67 * before). If the parent is "", we will add the entry to the root 68 * (top-level) 69 * @param name The caption of the new entry. 70 * @param id The Id of the new entry. If it is -1, the entry will be treated 71 * as a menu. 72 */ add(String parent, String name, int id)73 public void add(String parent, String name, int id) { 74 // A duplicate entry - we just throw it away, since its already in. 75 if (items.get(name) != null) { return; } 76 // A new submenu at the top-level 77 if (parent.equals("")) { 78 JMenu jli = new JMenu(name); 79 SVAbstractMenuItem mli = new SVSubMenuItem(name, jli); 80 items.put(name, mli); 81 root.add(jli); 82 } 83 // A new sub-submenu 84 else if (id == -1) { 85 SVAbstractMenuItem jmi = items.get(parent); 86 JMenu jli = new JMenu(name); 87 SVAbstractMenuItem mli = new SVSubMenuItem(name, jli); 88 items.put(name, mli); 89 jmi.add(jli); 90 } 91 // A new child entry. Add to appropriate parent. 92 else { 93 SVAbstractMenuItem jmi = items.get(parent); 94 if (jmi == null) { 95 System.out.println("ERROR: Unknown parent " + parent); 96 System.exit(1); 97 } 98 SVAbstractMenuItem mli = new SVEmptyMenuItem(id, name); 99 mli.mi.addActionListener(this); 100 items.put(name, mli); 101 jmi.add(mli); 102 } 103 } 104 105 /** 106 * Add a new checkbox entry to the menubar. 107 * 108 * @param parent The menu we add our new entry to (should have been defined 109 * before). If the parent is "", we will add the entry to the root 110 * (top-level) 111 * @param name The caption of the new entry. 112 * @param id The Id of the new entry. If it is -1, the entry will be treated 113 * as a menu. 114 * @param b Whether the entry is initally flagged. 115 * 116 */ 117 add(String parent, String name, int id, boolean b)118 public void add(String parent, String name, int id, boolean b) { 119 SVAbstractMenuItem jmi = items.get(parent); 120 if (jmi == null) { 121 System.out.println("ERROR: Unknown parent " + parent); 122 System.exit(1); 123 } 124 SVAbstractMenuItem mli = new SVCheckboxMenuItem(id, name, b); 125 mli.mi.addActionListener(this); 126 items.put(name, mli); 127 jmi.add(mli); 128 } 129 130 } 131