1/* 2 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package com.apple.laf; 27 28import java.awt.*; 29import java.awt.event.KeyEvent; 30 31import javax.swing.*; 32 33import com.apple.laf.AquaUtils.RecyclableSingleton; 34import com.apple.laf.AquaUtils.RecyclableSingletonFromDefaultConstructor; 35 36public class AquaMnemonicHandler { 37 private static final RecyclableSingleton<AltProcessor> altProcessor = new RecyclableSingletonFromDefaultConstructor<AltProcessor>(AltProcessor.class); 38 public static KeyEventPostProcessor getInstance() { 39 return altProcessor.get(); 40 } 41 42 protected static boolean isMnemonicHidden = true; // true by default 43 44 public static void setMnemonicHidden(final boolean hide) { 45 if (UIManager.getBoolean("Button.showMnemonics")) { 46 // Do not hide mnemonics if the UI defaults do not support this 47 isMnemonicHidden = false; 48 } else { 49 isMnemonicHidden = hide; 50 } 51 } 52 53 /** 54 * Gets the state of the hide mnemonic flag. This only has meaning if this feature is supported by the underlying OS. 55 * 56 * @return true if mnemonics are hidden, otherwise, false 57 * @see #setMnemonicHidden 58 * @since 1.4 59 */ 60 public static boolean isMnemonicHidden() { 61 if (UIManager.getBoolean("Button.showMnemonics")) { 62 // Do not hide mnemonics if the UI defaults do not support this 63 isMnemonicHidden = false; 64 } 65 return isMnemonicHidden; 66 } 67 68 static class AltProcessor implements KeyEventPostProcessor { 69 public boolean postProcessKeyEvent(final KeyEvent ev) { 70 if (ev.getKeyCode() != KeyEvent.VK_ALT) { 71 return false; 72 } 73 74 final JRootPane root = SwingUtilities.getRootPane(ev.getComponent()); 75 final Window winAncestor = (root == null ? null : SwingUtilities.getWindowAncestor(root)); 76 77 switch(ev.getID()) { 78 case KeyEvent.KEY_PRESSED: 79 setMnemonicHidden(false); 80 break; 81 case KeyEvent.KEY_RELEASED: 82 setMnemonicHidden(true); 83 break; 84 } 85 86 repaintMnemonicsInWindow(winAncestor); 87 88 return false; 89 } 90 } 91 92 /* 93 * Repaints all the components with the mnemonics in the given window and all its owned windows. 94 */ 95 static void repaintMnemonicsInWindow(final Window w) { 96 if (w == null || !w.isShowing()) { 97 return; 98 } 99 100 final Window[] ownedWindows = w.getOwnedWindows(); 101 for (final Window element : ownedWindows) { 102 repaintMnemonicsInWindow(element); 103 } 104 105 repaintMnemonicsInContainer(w); 106 } 107 108 /* 109 * Repaints all the components with the mnemonics in container. 110 * Recursively searches for all the subcomponents. 111 */ 112 static void repaintMnemonicsInContainer(final Container cont) { 113 for (int i = 0; i < cont.getComponentCount(); i++) { 114 final Component c = cont.getComponent(i); 115 if (c == null || !c.isVisible()) { 116 continue; 117 } 118 119 if (c instanceof AbstractButton && ((AbstractButton)c).getMnemonic() != '\0') { 120 c.repaint(); 121 continue; 122 } 123 124 if (c instanceof JLabel && ((JLabel)c).getDisplayedMnemonic() != '\0') { 125 c.repaint(); 126 continue; 127 } 128 129 if (c instanceof Container) { 130 repaintMnemonicsInContainer((Container)c); 131 } 132 } 133 } 134} 135