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1: /* InputMethod.java -- defines an interface for complex text input 2: Copyright (C) 2002, 2005 Free Software Foundation, Inc. 3: 4: This file is part of GNU Classpath. 5: 6: GNU Classpath is free software; you can redistribute it and/or modify 7: it under the terms of the GNU General Public License as published by 8: the Free Software Foundation; either version 2, or (at your option) 9: any later version. 10: 11: GNU Classpath is distributed in the hope that it will be useful, but 12: WITHOUT ANY WARRANTY; without even the implied warranty of 13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14: General Public License for more details. 15: 16: You should have received a copy of the GNU General Public License 17: along with GNU Classpath; see the file COPYING. If not, write to the 18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19: 02110-1301 USA. 20: 21: Linking this library statically or dynamically with other modules is 22: making a combined work based on this library. Thus, the terms and 23: conditions of the GNU General Public License cover the whole 24: combination. 25: 26: As a special exception, the copyright holders of this library give you 27: permission to link this library with independent modules to produce an 28: executable, regardless of the license terms of these independent 29: modules, and to copy and distribute the resulting executable under 30: terms of your choice, provided that you also meet, for each linked 31: independent module, the terms and conditions of the license of that 32: module. An independent module is a module which is not derived from 33: or based on this library. If you modify this library, you may extend 34: this exception to your version of the library, but you are not 35: obligated to do so. If you do not wish to do so, delete this 36: exception statement from your version. */ 37: 38: package java.awt.im.spi; 39: 40: import java.awt.AWTEvent; 41: import java.awt.Component; 42: import java.awt.Rectangle; 43: import java.awt.im.InputContext; 44: import java.awt.im.InputMethodRequests; 45: import java.text.AttributedCharacterIterator.Attribute; 46: import java.util.Locale; 47: 48: /** 49: * This interface supports complex text input, often for situations where 50: * the text is more complex than a keyboard will accomodate. For example, 51: * this can be used for Chinese, Japanese, and Korean, where multiple 52: * keystrokes are necessary to compose text. This could also support things 53: * like phonetic English, or reordering Thai. 54: * 55: * <p>These contexts can be loaded by the input method framework, using 56: * {@link InputContext#selectInputMethod(Locale)}. 57: * 58: * @author Eric Blake (ebb9@email.byu.edu) 59: * @since 1.3 60: * @status updated to 1.4 61: */ 62: public interface InputMethod 63: { 64: /** 65: * Set the input method context, which ties the input method to a client 66: * component. This is called once automatically when creating the input 67: * method. 68: * 69: * @param context the context for this input method 70: * @throws NullPointerException if context is null 71: */ 72: void setInputMethodContext(InputMethodContext context); 73: 74: /** 75: * Sets the input locale. If the input method supports that locale, it 76: * changes its behavior to be consistent with the locale and returns true. 77: * Otherwise, it returns false. This is called by 78: * {@link InputContext#selectInputMethod(Locale)} when the user specifies 79: * a locale, or when the previously selected input method had a locale. 80: * 81: * @param locale the locale to use for input 82: * @return true if the change is successful 83: * @throws NullPointerException if locale is null 84: */ 85: boolean setLocale(Locale locale); 86: 87: /** 88: * Returns the current input locale, or null if none is defined. This is 89: * called by {@link InputContext#getLocale()}, or before switching input 90: * methods. 91: * 92: * @return the current input locale, or null 93: */ 94: Locale getLocale(); 95: 96: /** 97: * Sets the allowed Unicode subsets that this input method can use. Null 98: * indicates that all characters are allowed. This is called after creation, 99: * or when switching to this input method, by 100: * {@link InputContext#setCharacterSubsets(Character.Subset[])}. 101: * 102: * @param subsets the accepted subsets for this input method, or null for all 103: */ 104: void setCharacterSubsets(Character.Subset[] subsets); 105: 106: /** 107: * Changes the enabled status of this input method. An enabled input method 108: * accepts incoming events for composition and control purposes, while a 109: * disabled input method ignores events (except for control purposes). This 110: * is called by {@link InputContext#setCompositionEnabled(boolean)} or when 111: * switching from an input method if the previous input method returned 112: * without exception on {@link #isCompositionEnabled()}. 113: * 114: * @param enable whether to enable this input method 115: * @throws UnsupportedOperationException if enabling/disabling is unsupported 116: * @see #isCompositionEnabled() 117: */ 118: void setCompositionEnabled(boolean enable); 119: 120: /** 121: * Find out if this input method is enabled. This is called by 122: * {@link InputContext#isCompositionEnabled()}, or when switching input 123: * methods via {@link InputContext#selectInputMethod(Locale)}. 124: * 125: * @return true if this input method is enabled 126: * @throws UnsupportedOperationException if enabling/disabling is unsupported 127: * @see #setCompositionEnabled(boolean) 128: */ 129: boolean isCompositionEnabled(); 130: 131: /** 132: * Starts a reconversion operation. The input method gets its text from the 133: * client, using {@link InputMethodRequests#getSelectedText(Attribute[])}. 134: * Then the composed and committed text produced by the operation is sent 135: * back to the client using a sequence of InputMethodEvents. This is called 136: * by {@link InputContext#reconvert()}. 137: * 138: * @throws UnsupportedOperationException if reconversion is unsupported 139: */ 140: void reconvert(); 141: 142: /** 143: * Dispatch an event to the input method. If input method support is enabled, 144: * certain events are dispatched to the input method before the client 145: * component or event listeners. The input method must either consume the 146: * event or pass it on to the component. Instances of InputEvent, including 147: * KeyEvent and MouseEvent, are given to this input method. This method is 148: * called by {@link InputContext#dispatchEvent(AWTEvent)}. 149: * 150: * @param event the event to dispatch 151: * @throws NullPointerException if event is null 152: */ 153: void dispatchEvent(AWTEvent event); 154: 155: /** 156: * Notify this input method of changes in the client window. This is called 157: * when notifications are enabled (see {@link 158: * InputMethodContext#enableClientWindowNotification(InputMethod, boolean)}, 159: * if {@link InputContext#removeNotify(Component)} has not been called. 160: * The following situations trigger a notification:<ul> 161: * <li>The client window changes in location, size, visibility, 162: * iconification, or is closed.</li> 163: * <li>When enabling client notification (or on the first activation after 164: * enabling if no client existed at the time).</li> 165: * <li>When activating a new client after <code>removeNotify</code> was 166: * called on a previous client.</li> 167: * </ul> 168: * 169: * @param bounds the client window's current bounds, or null 170: */ 171: void notifyClientWindowChange(Rectangle bounds); 172: 173: /** 174: * Activate this input method for input processing. If the input method 175: * provides its own windows, it should make them open and visible at this 176: * time. This method is called when a client component receives a 177: * FOCUS_GAINED event, or when switching to this input method from another 178: * one. It is only called when the input method is inactive, assuming that 179: * new instances begin in an inactive state. 180: */ 181: void activate(); 182: 183: /** 184: * Deactivate this input method, either temporarily or permanently for the 185: * given client. If the input method provides its own windows, it should 186: * only close those related to the current composition (such as a lookup 187: * choice panel), while leaving more persistant windows (like a control 188: * panel) open to avoid screen flicker. Before control is given to another 189: * input method, {@link #hideWindows()} will be called on this instance. 190: * This method is called when a client component receives a 191: * FOCUS_LOST event, when switching to another input method, or before 192: * {@link #removeNotify()} when the client is removed. 193: * 194: * @param isTemporary true if the focus change is temporary 195: */ 196: void deactivate(boolean isTemporary); 197: 198: /** 199: * Close or hide all windows opened by this input method. This is called 200: * before activating a different input method, and before calling 201: * {@link #dispose()} on this instance. It is only called when the input 202: * method is inactive. 203: */ 204: void hideWindows(); 205: 206: /** 207: * Notify the input method that a client component has been removed from its 208: * hierarchy, or that input method support has been disabled. This is 209: * called by {@link InputContext#removeNotify(Component)}, and only when the input 210: * method is inactive. 211: */ 212: void removeNotify(); 213: 214: /** 215: * End any input composition currently taking place. Depending on the 216: * platform and user preferences, this may commit or delete uncommitted text, 217: * using input method events. This may be called for a variety of reasons, 218: * such as when the user moves the insertion point in the client text outside 219: * the range of the composed text, or when text is saved to file. This is 220: * called by {@link InputContext#endComposition()}, when switching to a 221: * new input method, or by {@link InputContext#selectInputMethod(Locale)}. 222: */ 223: void endComposition(); 224: 225: /** 226: * Disposes the input method and release any resources it is using. In 227: * particular, the input method should dispose windows and close files. This 228: * is called by {@link InputContext#dispose()}, when the input method is 229: * inactive; and nothing will be called on this instance afterwards. 230: */ 231: void dispose(); 232: 233: /** 234: * Returns a control object from this input method, or null. A control object 235: * provides method to control the behavior of this input method, as well as 236: * query information about it. The object is implementation dependent, so 237: * clients must compare the result against known input method control 238: * object types. This is called by 239: * {@link InputContext#getInputMethodControlObject()}. 240: * 241: * @return the control object, or null 242: */ 243: Object getControlObject(); 244: } // interface InputMethod
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