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diff --git a/src/FullPinyinContext.cc b/src/FullPinyinContext.cc
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+/* vim:set et ts=4 sts=4:
+ *
+ * libpyzy - The Chinese PinYin and Bopomofo conversion library.
+ *
+ * Copyright (c) 2008-2010 Peng Huang <shawn.p.huang@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of the
+ * License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ * USA
+ */
+#include "FullPinyinContext.h"
+
+#include <cctype>
+
+#include "Config.h"
+#include "PinyinParser.h"
+
+
+namespace PyZy {
+
+FullPinyinContext::FullPinyinContext (PhoneticContext::Observer *observer)
+  : PinyinContext (observer)
+{
+}
+
+FullPinyinContext::~FullPinyinContext (void)
+{
+}
+
+bool
+FullPinyinContext::insert (char ch)
+{
+    if (!islower(ch) && ch != '\'') {
+        /* it is not available ch */
+        return false;
+    }
+
+    /* is full */
+    if (G_UNLIKELY (m_text.length () >= MAX_PINYIN_LEN))
+        return true;
+
+    m_text.insert (m_cursor++, ch);
+    updateInputText ();
+    updateCursor ();
+
+    if (G_UNLIKELY (!(m_config.option & PINYIN_INCOMPLETE_PINYIN))) {
+        updateSpecialPhrases ();
+        updatePinyin ();
+    }
+    else if (G_LIKELY (m_cursor <= m_pinyin_len + 2)) {
+        updateSpecialPhrases ();
+        updatePinyin ();
+    }
+    else {
+        if (updateSpecialPhrases ()) {
+            update ();
+        }
+        else {
+            updatePreeditText ();
+            updateAuxiliaryText ();
+        }
+    }
+    return true;
+}
+
+bool
+FullPinyinContext::removeCharBefore (void)
+{
+    if (G_UNLIKELY (m_cursor == 0))
+        return false;
+
+    m_cursor --;
+    m_text.erase (m_cursor, 1);
+    updateInputText ();
+    updateCursor ();
+    updateSpecialPhrases ();
+    updatePinyin ();
+
+    return true;
+}
+
+bool
+FullPinyinContext::removeCharAfter (void)
+{
+    if (G_UNLIKELY (m_cursor == m_text.length ()))
+        return false;
+
+    m_text.erase (m_cursor, 1);
+    updateInputText ();
+    updatePreeditText ();
+    updateAuxiliaryText ();
+
+    return true;
+}
+
+bool
+FullPinyinContext::removeWordBefore (void)
+{
+    if (G_UNLIKELY (m_cursor == 0))
+        return false;
+
+    size_t cursor;
+
+    if (G_UNLIKELY (m_cursor > m_pinyin_len)) {
+        cursor = m_pinyin_len;
+    }
+    else {
+        const Pinyin & p = *m_pinyin.back ();
+        cursor = m_cursor - p.len;
+        m_pinyin_len -= p.len;
+        m_pinyin.pop_back ();
+    }
+
+    m_text.erase (cursor, m_cursor - cursor);
+    m_cursor = cursor;
+    updateInputText ();
+    updateCursor ();
+    updateSpecialPhrases ();
+    updatePhraseEditor ();
+    update ();
+    return true;
+}
+
+bool
+FullPinyinContext::removeWordAfter (void)
+{
+    if (G_UNLIKELY (m_cursor == m_text.length ()))
+        return false;
+
+    m_text.erase (m_cursor, -1);
+    updateInputText ();
+    updatePreeditText ();
+    updateAuxiliaryText ();
+    return true;
+}
+
+bool
+FullPinyinContext::moveCursorLeft (void)
+{
+    if (G_UNLIKELY (m_cursor == 0))
+        return false;
+
+    m_cursor --;
+    updateCursor ();
+    updateSpecialPhrases ();
+    updatePinyin ();
+
+    return true;
+}
+
+bool
+FullPinyinContext::moveCursorRight (void)
+{
+    if (G_UNLIKELY (m_cursor == m_text.length ()))
+        return false;
+
+    m_cursor ++;
+    updateCursor ();
+    updateSpecialPhrases ();
+    updatePinyin ();
+
+    return true;
+}
+
+bool
+FullPinyinContext::moveCursorLeftByWord (void)
+{
+    if (G_UNLIKELY (m_cursor == 0))
+        return false;
+
+    if (G_UNLIKELY (m_cursor > m_pinyin_len)) {
+        m_cursor = m_pinyin_len;
+        return true;
+    }
+
+    const Pinyin & p = *m_pinyin.back ();
+    m_cursor -= p.len;
+    m_pinyin_len -= p.len;
+    m_pinyin.pop_back ();
+
+    updateCursor ();
+    updateSpecialPhrases ();
+    updatePhraseEditor ();
+    update ();
+    return true;
+}
+
+bool
+FullPinyinContext::moveCursorRightByWord (void)
+{
+    return moveCursorToEnd ();
+}
+
+bool
+FullPinyinContext::moveCursorToBegin (void)
+{
+    if (G_UNLIKELY (m_cursor == 0))
+        return false;
+
+    m_cursor = 0;
+    m_pinyin.clear ();
+    m_pinyin_len = 0;
+
+    updateCursor ();
+    updateSpecialPhrases ();
+    updatePhraseEditor ();
+    update ();
+    return true;
+}
+
+bool
+FullPinyinContext::moveCursorToEnd (void)
+{
+    if (G_UNLIKELY (m_cursor == m_text.length ()))
+        return false;
+
+    m_cursor = m_text.length ();
+    updateCursor ();
+    updateSpecialPhrases ();
+    updatePinyin ();
+
+    return true;
+}
+
+void
+FullPinyinContext::updatePinyin (void)
+{
+    if (G_UNLIKELY (m_text.empty ())) {
+        m_pinyin.clear ();
+        m_pinyin_len = 0;
+    }
+    else {
+        m_pinyin_len = PinyinParser::parse (
+            m_text,              // text
+            m_cursor,            // text length
+            m_config.option,     // option
+            m_pinyin,            // result
+            MAX_PHRASE_LEN);     // max result length
+    }
+
+    updatePhraseEditor ();
+    update ();
+}
+
+};  // namespace PyZy