| 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.TKeypress; |
| 34 | import jexer.TWidget; |
| 35 | import jexer.bits.CellAttributes; |
| 36 | import jexer.bits.GraphicsChars; |
| 37 | import jexer.event.TKeypressEvent; |
| 38 | import static jexer.TKeypress.*; |
| 39 | |
| 40 | /** |
| 41 | * TSubMenu is a special case menu item that wraps another TMenu. |
| 42 | */ |
| 43 | public final class TSubMenu extends TMenuItem { |
| 44 | |
| 45 | /** |
| 46 | * The menu window. Note package private access. |
| 47 | */ |
| 48 | TMenu menu; |
| 49 | |
| 50 | /** |
| 51 | * Package private constructor. |
| 52 | * |
| 53 | * @param parent parent widget |
| 54 | * @param title menu title. Title must contain a keyboard shortcut, |
| 55 | * denoted by prefixing a letter with "&", e.g. "&File" |
| 56 | * @param x column relative to parent |
| 57 | * @param y row relative to parent |
| 58 | */ |
| 59 | TSubMenu(final TMenu parent, final String title, final int x, final int y) { |
| 60 | super(parent, TMenu.MID_UNUSED, x, y, title); |
| 61 | |
| 62 | setActive(false); |
| 63 | setEnabled(true); |
| 64 | |
| 65 | this.menu = new TMenu(parent.getApplication(), x, getAbsoluteY() - 1, |
| 66 | title); |
| 67 | setWidth(menu.getWidth() + 2); |
| 68 | |
| 69 | this.menu.isSubMenu = true; |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * Draw the menu title. |
| 74 | */ |
| 75 | @Override |
| 76 | public void draw() { |
| 77 | super.draw(); |
| 78 | |
| 79 | CellAttributes background = getTheme().getColor("tmenu"); |
| 80 | CellAttributes menuColor; |
| 81 | CellAttributes menuMnemonicColor; |
| 82 | if (getAbsoluteActive()) { |
| 83 | menuColor = getTheme().getColor("tmenu.highlighted"); |
| 84 | menuMnemonicColor = getTheme().getColor("tmenu.mnemonic.highlighted"); |
| 85 | } else { |
| 86 | if (getEnabled()) { |
| 87 | menuColor = getTheme().getColor("tmenu"); |
| 88 | menuMnemonicColor = getTheme().getColor("tmenu.mnemonic"); |
| 89 | } else { |
| 90 | menuColor = getTheme().getColor("tmenu.disabled"); |
| 91 | menuMnemonicColor = getTheme().getColor("tmenu.disabled"); |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | // Add the arrow |
| 96 | getScreen().putCharXY(getWidth() - 2, 0, GraphicsChars.CP437[0x10], |
| 97 | menuColor); |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | * Handle keystrokes. |
| 102 | * |
| 103 | * @param keypress keystroke event |
| 104 | */ |
| 105 | @Override |
| 106 | public void onKeypress(final TKeypressEvent keypress) { |
| 107 | |
| 108 | if (menu.getActive()) { |
| 109 | menu.onKeypress(keypress); |
| 110 | return; |
| 111 | } |
| 112 | |
| 113 | if (keypress.equals(kbEnter)) { |
| 114 | dispatch(); |
| 115 | return; |
| 116 | } |
| 117 | |
| 118 | if (keypress.equals(kbRight)) { |
| 119 | dispatch(); |
| 120 | return; |
| 121 | } |
| 122 | |
| 123 | if (keypress.equals(kbDown)) { |
| 124 | getParent().switchWidget(true); |
| 125 | return; |
| 126 | } |
| 127 | |
| 128 | if (keypress.equals(kbUp)) { |
| 129 | getParent().switchWidget(false); |
| 130 | return; |
| 131 | } |
| 132 | |
| 133 | if (keypress.equals(kbLeft)) { |
| 134 | TMenu parentMenu = (TMenu) getParent(); |
| 135 | if (parentMenu.isSubMenu) { |
| 136 | getApplication().closeSubMenu(); |
| 137 | } else { |
| 138 | getApplication().switchMenu(false); |
| 139 | } |
| 140 | return; |
| 141 | } |
| 142 | |
| 143 | if (keypress.equals(kbEsc)) { |
| 144 | getApplication().closeMenu(); |
| 145 | return; |
| 146 | } |
| 147 | } |
| 148 | |
| 149 | /** |
| 150 | * Override dispatch() to do nothing. |
| 151 | */ |
| 152 | @Override |
| 153 | public void dispatch() { |
| 154 | assert (getEnabled()); |
| 155 | if (getAbsoluteActive()) { |
| 156 | if (!menu.getActive()) { |
| 157 | getApplication().addSubMenu(menu); |
| 158 | menu.setActive(true); |
| 159 | } |
| 160 | } |
| 161 | } |
| 162 | |
| 163 | /** |
| 164 | * Returns my active widget. |
| 165 | * |
| 166 | * @return widget that is active, or this if no children |
| 167 | */ |
| 168 | @Override |
| 169 | public TWidget getActiveChild() { |
| 170 | if (menu.getActive()) { |
| 171 | return menu; |
| 172 | } |
| 173 | // Menu not active, return me |
| 174 | return this; |
| 175 | } |
| 176 | |
| 177 | /** |
| 178 | * Convenience function to add a custom menu item. |
| 179 | * |
| 180 | * @param id menu item ID. Must be greater than 1024. |
| 181 | * @param label menu item label |
| 182 | * @param key global keyboard accelerator |
| 183 | * @return the new menu item |
| 184 | */ |
| 185 | public TMenuItem addItem(final int id, final String label, |
| 186 | final TKeypress key) { |
| 187 | |
| 188 | return menu.addItem(id, label, key); |
| 189 | } |
| 190 | |
| 191 | /** |
| 192 | * Convenience function to add a menu item. |
| 193 | * |
| 194 | * @param id menu item ID. Must be greater than 1024. |
| 195 | * @param label menu item label |
| 196 | * @return the new menu item |
| 197 | */ |
| 198 | public TMenuItem addItem(final int id, final String label) { |
| 199 | return menu.addItem(id, label); |
| 200 | } |
| 201 | |
| 202 | /** |
| 203 | * Convenience function to add one of the default menu items. |
| 204 | * |
| 205 | * @param id menu item ID. Must be between 0 (inclusive) and 1023 |
| 206 | * (inclusive). |
| 207 | * @return the new menu item |
| 208 | */ |
| 209 | public TMenuItem addDefaultItem(final int id) { |
| 210 | return menu.addDefaultItem(id); |
| 211 | } |
| 212 | |
| 213 | /** |
| 214 | * Convenience function to add a menu separator. |
| 215 | */ |
| 216 | public void addSeparator() { |
| 217 | menu.addSeparator(); |
| 218 | } |
| 219 | |
| 220 | /** |
| 221 | * Convenience function to add a sub-menu. |
| 222 | * |
| 223 | * @param title menu title. Title must contain a keyboard shortcut, |
| 224 | * denoted by prefixing a letter with "&", e.g. "&File" |
| 225 | * @return the new sub-menu |
| 226 | */ |
| 227 | public TSubMenu addSubMenu(final String title) { |
| 228 | return menu.addSubMenu(title); |
| 229 | } |
| 230 | |
| 231 | |
| 232 | } |