| 1 | /** |
| 2 | * Jexer - Java Text User Interface |
| 3 | * |
| 4 | * License: LGPLv3 or later |
| 5 | * |
| 6 | * This module is licensed under the GNU Lesser General Public License |
| 7 | * Version 3. Please see the file "COPYING" in this directory for more |
| 8 | * information about the GNU Lesser General Public License Version 3. |
| 9 | * |
| 10 | * Copyright (C) 2015 Kevin Lamonte |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or |
| 13 | * modify it under the terms of the GNU Lesser General Public License |
| 14 | * as published by the Free Software Foundation; either version 3 of |
| 15 | * the License, or (at your option) any later version. |
| 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, but |
| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 20 | * General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU Lesser General Public |
| 23 | * License along with this program; if not, see |
| 24 | * http://www.gnu.org/licenses/, or write to the Free Software |
| 25 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA |
| 26 | * 02110-1301 USA |
| 27 | * |
| 28 | * @author Kevin Lamonte [kevin.lamonte@gmail.com] |
| 29 | * @version 1 |
| 30 | */ |
| 31 | package jexer.menu; |
| 32 | |
| 33 | import jexer.TWidget; |
| 34 | import jexer.bits.CellAttributes; |
| 35 | import jexer.bits.GraphicsChars; |
| 36 | import jexer.event.TKeypressEvent; |
| 37 | import static jexer.TKeypress.*; |
| 38 | |
| 39 | /** |
| 40 | * TSubMenu is a special case menu item that wraps another TMenu. |
| 41 | */ |
| 42 | public class TSubMenu extends TMenuItem { |
| 43 | |
| 44 | /** |
| 45 | * The menu window. Note package private access. |
| 46 | */ |
| 47 | TMenu menu; |
| 48 | |
| 49 | /** |
| 50 | * Package private constructor. |
| 51 | * |
| 52 | * @param parent parent widget |
| 53 | * @param title menu title. Title must contain a keyboard shortcut, |
| 54 | * denoted by prefixing a letter with "&", e.g. "&File" |
| 55 | * @param x column relative to parent |
| 56 | * @param y row relative to parent |
| 57 | */ |
| 58 | TSubMenu(final TMenu parent, final String title, final int x, final int y) { |
| 59 | super(parent, TMenu.MID_UNUSED, x, y, title); |
| 60 | |
| 61 | setActive(false); |
| 62 | setEnabled(true); |
| 63 | |
| 64 | this.menu = new TMenu(parent.getApplication(), x, getAbsoluteY() - 1, |
| 65 | title); |
| 66 | setWidth(menu.getWidth() + 2); |
| 67 | |
| 68 | this.menu.isSubMenu = true; |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * Draw the menu title. |
| 73 | */ |
| 74 | @Override |
| 75 | public void draw() { |
| 76 | super.draw(); |
| 77 | |
| 78 | CellAttributes background = getTheme().getColor("tmenu"); |
| 79 | CellAttributes menuColor; |
| 80 | CellAttributes menuMnemonicColor; |
| 81 | if (getAbsoluteActive()) { |
| 82 | menuColor = getTheme().getColor("tmenu.highlighted"); |
| 83 | menuMnemonicColor = getTheme().getColor("tmenu.mnemonic.highlighted"); |
| 84 | } else { |
| 85 | if (getEnabled()) { |
| 86 | menuColor = getTheme().getColor("tmenu"); |
| 87 | menuMnemonicColor = getTheme().getColor("tmenu.mnemonic"); |
| 88 | } else { |
| 89 | menuColor = getTheme().getColor("tmenu.disabled"); |
| 90 | menuMnemonicColor = getTheme().getColor("tmenu.disabled"); |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | // Add the arrow |
| 95 | getScreen().putCharXY(getWidth() - 2, 0, GraphicsChars.CP437[0x10], |
| 96 | menuColor); |
| 97 | } |
| 98 | |
| 99 | /** |
| 100 | * Handle keystrokes. |
| 101 | * |
| 102 | * @param keypress keystroke event |
| 103 | */ |
| 104 | @Override |
| 105 | public void onKeypress(final TKeypressEvent keypress) { |
| 106 | |
| 107 | if (menu.getActive()) { |
| 108 | menu.onKeypress(keypress); |
| 109 | return; |
| 110 | } |
| 111 | |
| 112 | if (keypress.equals(kbEnter)) { |
| 113 | dispatch(); |
| 114 | return; |
| 115 | } |
| 116 | |
| 117 | if (keypress.equals(kbRight)) { |
| 118 | dispatch(); |
| 119 | return; |
| 120 | } |
| 121 | |
| 122 | if (keypress.equals(kbDown)) { |
| 123 | getParent().switchWidget(true); |
| 124 | return; |
| 125 | } |
| 126 | |
| 127 | if (keypress.equals(kbUp)) { |
| 128 | getParent().switchWidget(false); |
| 129 | return; |
| 130 | } |
| 131 | |
| 132 | if (keypress.equals(kbLeft)) { |
| 133 | TMenu parentMenu = (TMenu) getParent(); |
| 134 | if (parentMenu.isSubMenu) { |
| 135 | getApplication().closeSubMenu(); |
| 136 | } else { |
| 137 | getApplication().switchMenu(false); |
| 138 | } |
| 139 | return; |
| 140 | } |
| 141 | |
| 142 | if (keypress.equals(kbEsc)) { |
| 143 | getApplication().closeMenu(); |
| 144 | return; |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * Override dispatch() to do nothing. |
| 150 | */ |
| 151 | @Override |
| 152 | public void dispatch() { |
| 153 | assert (getEnabled()); |
| 154 | if (getAbsoluteActive()) { |
| 155 | if (!menu.getActive()) { |
| 156 | getApplication().addSubMenu(menu); |
| 157 | menu.setActive(true); |
| 158 | } |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | /** |
| 163 | * Returns my active widget. |
| 164 | * |
| 165 | * @return widget that is active, or this if no children |
| 166 | */ |
| 167 | @Override |
| 168 | public TWidget getActiveChild() { |
| 169 | if (menu.getActive()) { |
| 170 | return menu; |
| 171 | } |
| 172 | // Menu not active, return me |
| 173 | return this; |
| 174 | } |
| 175 | |
| 176 | } |