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 * 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

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 */

package sun.awt;

import java.awt.AWTException;

import java.awt.EventQueue;

import java.awt.event.InputMethodEvent;

import java.awt.font.TextAttribute;

import java.awt.font.TextHitInfo;

import java.awt.peer.ComponentPeer;

import java.text.AttributedString;

import sun.util.logging.PlatformLogger;

/**

 *

 * @author JavaSoft International

 */

    /**

     * Constructs an X11InputMethod instance. It initializes the XIM

     * environment if it's not done yet.

     *

     * @exception AWTException if XOpenIM() failed.

     */

    public X11InputMethod() throws AWTException {

    }

    /**

     * Reset the composition state to the current composition state.

     */

            try {

                /* Restore the composition mode to the last saved composition

                   mode. */

                setCompositionEnabled(savedCompositionState);

            } catch (UnsupportedOperationException e) {

                compositionEnableSupported = false;

            }

        }

    }

    /**

     * Activate input method.

     */

    public synchronized void activate() {

        clientComponentWindow = getClientComponentWindow();

        if (clientComponentWindow == null)

            return;

            if (log.isLoggable(PlatformLogger.Level.FINE)) {

                log.fine("XICFocused {0}, AWTFocused {1}",

                         lastXICFocussedComponent, awtFocussedComponent);

            }

        }

        if (pData == 0) {

            if (!createXIC()) {

                return;

            }

            disposed = false;

        }

        /*  reset input context if necessary and set the XIC focus

        */

        resetXICifneeded();

        ComponentPeer awtFocussedComponentPeer = getPeer(awtFocussedComponent);

        }

        isActive = true;

    }

    /**

     * Deactivate input method.

     */

    public synchronized void deactivate(boolean isTemporary) {

        boolean   isAc =  haveActiveClient();

        /* Usually as the client component, let's call it component A,

           loses the focus, this method is called. Then when another client

           component, let's call it component B,  gets the focus, activate is first called on

           the previous focused compoent which is A, then endComposition is called on A,

           deactivate is called on A again. And finally activate is called on the newly

           focused component B. Here is the call sequence.

           A loses focus               B gains focus

           -------------> deactivate A -------------> activate A -> endComposition A ->

           deactivate A -> activate B ----....

           So in order to carry the composition mode across the components sharing the same

           input context, we save it when deactivate is called so that when activate is

           called, it can be restored correctly till activate is called on the newly focused

           component. (See also sun/awt/im/InputContext and bug 6184471).

           Last note, getCompositionState should be called before setXICFocus since

           setXICFocus here sets the XIC to 0.

        */

        savedCompositionState = getCompositionState();

            //turn the status window off...

            turnoffStatusWindow();

        }

        isLastXICActive = isAc;

        isLastTemporary = isTemporary;

        isActive = false;

    }

    // implements java.awt.im.spi.InputMethod.hideWindows

    public void hideWindows() {

        }

    }

    /**

     * Updates composed text with XIM preedit information and

     * posts composed text to the awt event queue. The args of

     * this method correspond to the XIM preedit callback

     * information. The XIM highlight attributes are translated via

     * fixed mapping (i.e., independent from any underlying input

     * method engine). This method is invoked in the AWT Toolkit

     * (X event loop) thread context and thus inside the AWT Lock.

     */

    // NOTE: This method may be called by privileged threads.

    //       This functionality is implemented in a package-private method

    //       to insure that it cannot be overridden by client subclasses.

    //       DO NOT INVOKE CLIENT CODE ON THIS THREAD!

    void dispatchComposedText(String chgText,

                                           int chgStyles[],

                                           int chgOffset,

                                           int chgLength,

                                           int caretPosition,

                                           long when) {

        if (disposed) {

            return;

        }

        if (chgText == null

            && chgStyles == null

            && chgOffset == 0

            && chgLength == 0

            && caretPosition == 0

            && composedText == null

            && committedText == null)

            return;

        if (composedText == null) {

            // TODO: avoid reallocation of those buffers

            composedText = new StringBuffer(INITIAL_SIZE);

            rawFeedbacks = new IntBuffer(INITIAL_SIZE);

        }

        if (chgLength > 0) {

            if (chgText == null && chgStyles != null) {

                rawFeedbacks.replace(chgOffset, chgStyles);

            } else {

                if (chgLength == composedText.length()) {

                    // optimization for the special case to replace the

                    // entire previous text

                    composedText = new StringBuffer(INITIAL_SIZE);

                    rawFeedbacks = new IntBuffer(INITIAL_SIZE);

                } else {

                    if (composedText.length() > 0) {

                        if (chgOffset+chgLength < composedText.length()) {

                            String text;

                            text = composedText.toString().substring(chgOffset+chgLength,

                                                                     composedText.length());

                            composedText.setLength(chgOffset);

                            composedText.append(text);

                        } else {

                            // in case to remove substring from chgOffset

                            // to the end

                            composedText.setLength(chgOffset);

                        }

                        rawFeedbacks.remove(chgOffset, chgLength);

                    }

                }

            }

        }

        if (chgText != null) {

            composedText.insert(chgOffset, chgText);

                rawFeedbacks.insert(chgOffset, chgStyles);

        }

        if (composedText.length() == 0) {

            composedText = null;

            rawFeedbacks = null;

            // if there is any outstanding committed text stored by

            // dispatchCommittedText(), it has to be sent to the

            // client component.

            if (committedText != null) {

                dispatchCommittedText(committedText, when);

                committedText = null;

                return;

            }

            // otherwise, send null text to delete client's composed

            // text.

            postInputMethodEvent(InputMethodEvent.INPUT_METHOD_TEXT_CHANGED,

                                 null,

                                 0,

                                 null,

                                 null,

                                 when);

            return;

        }

        // Now sending the composed text to the client

        int composedOffset;

        AttributedString inputText;

        // if there is any partially committed text, concatenate it to

        // the composed text.

        if (committedText != null) {

            composedOffset = committedText.length();

            inputText = new AttributedString(committedText + composedText);

            committedText = null;

        } else {

            composedOffset = 0;

            inputText = new AttributedString(composedText.toString());

        }

        int currentFeedback;

        int nextFeedback;

        int startOffset = 0;

        int currentOffset;

        int visiblePosition = 0;

        TextHitInfo visiblePositionInfo = null;

        rawFeedbacks.rewind();

        currentFeedback = rawFeedbacks.getNext();

        rawFeedbacks.unget();

        while ((nextFeedback = rawFeedbacks.getNext()) != -1) {

            if (visiblePosition == 0) {

                visiblePosition = nextFeedback & XIMVisibleMask;

                if (visiblePosition != 0) {

                    int index = rawFeedbacks.getOffset() - 1;

                    if (visiblePosition == XIMVisibleToBackward)

                        visiblePositionInfo = TextHitInfo.leading(index);

                    else

                        visiblePositionInfo = TextHitInfo.trailing(index);

                }

            }

            nextFeedback &= ~XIMVisibleMask;

            if (currentFeedback != nextFeedback) {

                rawFeedbacks.unget();

                currentOffset = rawFeedbacks.getOffset();

                inputText.addAttribute(TextAttribute.INPUT_METHOD_HIGHLIGHT,

                                       convertVisualFeedbackToHighlight(currentFeedback),

                                       composedOffset + startOffset,

                                       composedOffset + currentOffset);

                startOffset = currentOffset;

                currentFeedback = nextFeedback;

            }

        }

        currentOffset = rawFeedbacks.getOffset();

        if (currentOffset >= 0) {

            inputText.addAttribute(TextAttribute.INPUT_METHOD_HIGHLIGHT,

                                   convertVisualFeedbackToHighlight(currentFeedback),

                                   composedOffset + startOffset,

                                   composedOffset + currentOffset);

        }

        postInputMethodEvent(InputMethodEvent.INPUT_METHOD_TEXT_CHANGED,

                             inputText.getIterator(),

                             composedOffset,

                             TextHitInfo.leading(caretPosition),

                             visiblePositionInfo,

                             when);

    }

        }

        }

    }

    /*

     * Subclasses should override disposeImpl() instead of dispose(). Client

     * code should always invoke dispose(), never disposeImpl().

     */

    protected synchronized void disposeImpl() {

        disposeXIC();

        awtLock();

        awtFocussedComponent = null;

        lastXICFocussedComponent = null;

    }

    /**

     * @see java.awt.im.spi.InputMethod#setCompositionEnabled(boolean)

     */

    public void setCompositionEnabled(boolean enable) {

        /* If the composition state is successfully changed, set

           the savedCompositionState to 'enable'. Otherwise, simply

           return.

           setCompositionEnabledNative may throw UnsupportedOperationException.

           Don't try to catch it since the method may be called by clients.

           Use package private mthod 'resetCompositionState' if you want the

           exception to be caught.

        */

        if (setCompositionEnabledNative(enable)) {

            savedCompositionState = enable;

        }

        }

    }

}