| /* |
| * Copyright (c) 1999, 2006, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.awt.im; |
| |
| import java.awt.Component; |
| import java.awt.Container; |
| import java.awt.Rectangle; |
| import java.awt.event.InputMethodEvent; |
| import java.awt.event.InputMethodListener; |
| import java.awt.font.TextAttribute; |
| import java.awt.font.TextHitInfo; |
| import java.awt.im.InputMethodRequests; |
| import java.text.AttributedCharacterIterator; |
| import java.text.AttributedCharacterIterator.Attribute; |
| import java.text.AttributedString; |
| |
| /** |
| * A composition area handler handles events and input method requests for |
| * the composition area. Typically each input method context has its own |
| * composition area handler if it supports passive clients or below-the-spot |
| * input, but all handlers share a single composition area. |
| * |
| * @author JavaSoft International |
| */ |
| |
| class CompositionAreaHandler implements InputMethodListener, |
| InputMethodRequests { |
| |
| private static CompositionArea compositionArea; |
| private static Object compositionAreaLock = new Object(); |
| private static CompositionAreaHandler compositionAreaOwner; // synchronized through compositionArea |
| |
| private AttributedCharacterIterator composedText; |
| private TextHitInfo caret = null; |
| private Component clientComponent = null; |
| private InputMethodContext inputMethodContext; |
| |
| /** |
| * Constructs the composition area handler. |
| */ |
| CompositionAreaHandler(InputMethodContext context) { |
| inputMethodContext = context; |
| } |
| |
| /** |
| * Creates the composition area. |
| */ |
| private void createCompositionArea() { |
| synchronized(compositionAreaLock) { |
| compositionArea = new CompositionArea(); |
| if (compositionAreaOwner != null) { |
| compositionArea.setHandlerInfo(compositionAreaOwner, inputMethodContext); |
| } |
| // If the client component is an active client using below-the-spot style, then |
| // make the composition window undecorated without a title bar. |
| if(clientComponent!=null){ |
| InputMethodRequests req = clientComponent.getInputMethodRequests(); |
| if (req != null && inputMethodContext.useBelowTheSpotInput()) { |
| setCompositionAreaUndecorated(true); |
| } |
| } |
| } |
| } |
| |
| void setClientComponent(Component clientComponent) { |
| this.clientComponent = clientComponent; |
| } |
| |
| /** |
| * Grabs the composition area, makes this handler its owner, and installs |
| * the handler and its input context into the composition area for event |
| * and input method request handling. |
| * If doUpdate is true, updates the composition area with previously sent |
| * composed text. |
| */ |
| |
| void grabCompositionArea(boolean doUpdate) { |
| synchronized (compositionAreaLock) { |
| if (compositionAreaOwner != this) { |
| compositionAreaOwner = this; |
| if (compositionArea != null) { |
| compositionArea.setHandlerInfo(this, inputMethodContext); |
| } |
| if (doUpdate) { |
| // Create the composition area if necessary |
| if ((composedText != null) && (compositionArea == null)) { |
| createCompositionArea(); |
| } |
| if (compositionArea != null) { |
| compositionArea.setText(composedText, caret); |
| } |
| } |
| } |
| } |
| } |
| |
| /** |
| * Releases and closes the composition area if it is currently owned by |
| * this composition area handler. |
| */ |
| void releaseCompositionArea() { |
| synchronized (compositionAreaLock) { |
| if (compositionAreaOwner == this) { |
| compositionAreaOwner = null; |
| if (compositionArea != null) { |
| compositionArea.setHandlerInfo(null, null); |
| compositionArea.setText(null, null); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Releases and closes the composition area if it has been created, |
| * independent of the current owner. |
| */ |
| static void closeCompositionArea() { |
| if (compositionArea != null) { |
| synchronized (compositionAreaLock) { |
| compositionAreaOwner = null; |
| compositionArea.setHandlerInfo(null, null); |
| compositionArea.setText(null, null); |
| } |
| } |
| } |
| |
| /** |
| * Returns whether the composition area is currently visible |
| */ |
| boolean isCompositionAreaVisible() { |
| if (compositionArea != null) { |
| return compositionArea.isCompositionAreaVisible(); |
| } |
| |
| return false; |
| } |
| |
| |
| /** |
| * Shows or hides the composition Area |
| */ |
| void setCompositionAreaVisible(boolean visible) { |
| if (compositionArea != null) { |
| compositionArea.setCompositionAreaVisible(visible); |
| } |
| } |
| |
| void processInputMethodEvent(InputMethodEvent event) { |
| if (event.getID() == InputMethodEvent.INPUT_METHOD_TEXT_CHANGED) { |
| inputMethodTextChanged(event); |
| } else { |
| caretPositionChanged(event); |
| } |
| } |
| |
| /** |
| * set the compositionArea frame decoration |
| */ |
| void setCompositionAreaUndecorated(boolean undecorated) { |
| if (compositionArea != null) { |
| compositionArea.setCompositionAreaUndecorated(undecorated); |
| } |
| } |
| |
| // |
| // InputMethodListener methods |
| // |
| |
| private static final Attribute[] IM_ATTRIBUTES = |
| { TextAttribute.INPUT_METHOD_HIGHLIGHT }; |
| |
| public void inputMethodTextChanged(InputMethodEvent event) { |
| AttributedCharacterIterator text = event.getText(); |
| int committedCharacterCount = event.getCommittedCharacterCount(); |
| |
| // extract composed text and prepare it for display |
| composedText = null; |
| caret = null; |
| if (text != null |
| && committedCharacterCount < text.getEndIndex() - text.getBeginIndex()) { |
| |
| // Create the composition area if necessary |
| if (compositionArea == null) { |
| createCompositionArea(); |
| } |
| |
| // copy the composed text |
| AttributedString composedTextString; |
| composedTextString = new AttributedString(text, |
| text.getBeginIndex() + committedCharacterCount, // skip over committed text |
| text.getEndIndex(), IM_ATTRIBUTES); |
| composedTextString.addAttribute(TextAttribute.FONT, compositionArea.getFont()); |
| composedText = composedTextString.getIterator(); |
| caret = event.getCaret(); |
| } |
| |
| if (compositionArea != null) { |
| compositionArea.setText(composedText, caret); |
| } |
| |
| // send any committed text to the text component |
| if (committedCharacterCount > 0) { |
| inputMethodContext.dispatchCommittedText(((Component) event.getSource()), |
| text, committedCharacterCount); |
| |
| // this may have changed the text location, so reposition the window |
| if (isCompositionAreaVisible()) { |
| compositionArea.updateWindowLocation(); |
| } |
| } |
| |
| // event has been handled, so consume it |
| event.consume(); |
| } |
| |
| public void caretPositionChanged(InputMethodEvent event) { |
| if (compositionArea != null) { |
| compositionArea.setCaret(event.getCaret()); |
| } |
| |
| // event has been handled, so consume it |
| event.consume(); |
| } |
| |
| // |
| // InputMethodRequests methods |
| // |
| |
| /** |
| * Returns the input method request handler of the client component. |
| * When using the composition window for an active client (below-the-spot |
| * input), input method requests that do not relate to the display of |
| * the composed text are forwarded to the client component. |
| */ |
| InputMethodRequests getClientInputMethodRequests() { |
| if (clientComponent != null) { |
| return (InputMethodRequests) clientComponent.getInputMethodRequests(); |
| } |
| |
| return null; |
| } |
| |
| public Rectangle getTextLocation(TextHitInfo offset) { |
| synchronized (compositionAreaLock) { |
| if (compositionAreaOwner == this && isCompositionAreaVisible()) { |
| return compositionArea.getTextLocation(offset); |
| } else if (composedText != null) { |
| // there's composed text, but it's not displayed, so fake a rectangle |
| return new Rectangle(0, 0, 0, 10); |
| } else { |
| InputMethodRequests requests = getClientInputMethodRequests(); |
| if (requests != null) { |
| return requests.getTextLocation(offset); |
| } else { |
| // passive client, no composed text, so fake a rectangle |
| return new Rectangle(0, 0, 0, 10); |
| } |
| } |
| } |
| } |
| |
| public TextHitInfo getLocationOffset(int x, int y) { |
| synchronized (compositionAreaLock) { |
| if (compositionAreaOwner == this && isCompositionAreaVisible()) { |
| return compositionArea.getLocationOffset(x, y); |
| } else { |
| return null; |
| } |
| } |
| } |
| |
| public int getInsertPositionOffset() { |
| InputMethodRequests req = getClientInputMethodRequests(); |
| if (req != null) { |
| return req.getInsertPositionOffset(); |
| } |
| |
| // we don't have access to the client component's text. |
| return 0; |
| } |
| |
| private static final AttributedCharacterIterator EMPTY_TEXT = |
| (new AttributedString("")).getIterator(); |
| |
| public AttributedCharacterIterator getCommittedText(int beginIndex, |
| int endIndex, |
| Attribute[] attributes) { |
| InputMethodRequests req = getClientInputMethodRequests(); |
| if(req != null) { |
| return req.getCommittedText(beginIndex, endIndex, attributes); |
| } |
| |
| // we don't have access to the client component's text. |
| return EMPTY_TEXT; |
| } |
| |
| public int getCommittedTextLength() { |
| InputMethodRequests req = getClientInputMethodRequests(); |
| if(req != null) { |
| return req.getCommittedTextLength(); |
| } |
| |
| // we don't have access to the client component's text. |
| return 0; |
| } |
| |
| |
| public AttributedCharacterIterator cancelLatestCommittedText(Attribute[] attributes) { |
| InputMethodRequests req = getClientInputMethodRequests(); |
| if(req != null) { |
| return req.cancelLatestCommittedText(attributes); |
| } |
| |
| // we don't have access to the client component's text. |
| return null; |
| } |
| |
| public AttributedCharacterIterator getSelectedText(Attribute[] attributes) { |
| InputMethodRequests req = getClientInputMethodRequests(); |
| if(req != null) { |
| return req.getSelectedText(attributes); |
| } |
| |
| // we don't have access to the client component's text. |
| return EMPTY_TEXT; |
| } |
| |
| } |