diff --git a/CMakeLists.txt b/CMakeLists.txt
index f1b3deb..5da90d8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,9 +1,11 @@
 cmake_minimum_required(VERSION 3.21)
 project(fcitx5-quwei)
 
+find_package(Gettext REQUIRED)
 find_package(Fcitx5Core REQUIRED)
 
 # Setup some compiler option that is generally useful and compatible with Fcitx 5 (C++17)
 include("${FCITX_INSTALL_CMAKECONFIG_DIR}/Fcitx5Utils/Fcitx5CompilerSettings.cmake")
 
 add_subdirectory(src)
+add_subdirectory(po)
diff --git a/po/CMakeLists.txt b/po/CMakeLists.txt
new file mode 100644
index 0000000..461c734
--- /dev/null
+++ b/po/CMakeLists.txt
@@ -0,0 +1 @@
+fcitx5_install_translation(fcitx5-quwei)
diff --git a/po/LINGUAS b/po/LINGUAS
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/po/LINGUAS
@@ -0,0 +1 @@
+
diff --git a/po/fcitx5-quwei.pot b/po/fcitx5-quwei.pot
new file mode 100644
index 0000000..15d4bfe
--- /dev/null
+++ b/po/fcitx5-quwei.pot
@@ -0,0 +1,22 @@
+# SOME DESCRIPTIVE TITLE.
+# Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
+# This file is distributed under the same license as the fcitx5-quwei package.
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: fcitx5-quwei\n"
+"Report-Msgid-Bugs-To: fcitx-dev@googlegroups.com\n"
+"POT-Creation-Date: 2021-11-16 10:07-0800\n"
+"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
+"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language-Team: LANGUAGE <LL@li.org>\n"
+"Language: LANG\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=utf-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+
+#. Translatable name of the input method
+#: build/src/quwei-addon.conf.in:3 src/quwei-addon.conf.in.in:3
+#: src/quwei.conf.in:4
+msgid "Quwei"
+msgstr ""
diff --git a/po/zh_CN.po b/po/zh_CN.po
new file mode 100644
index 0000000..15d4bfe
--- /dev/null
+++ b/po/zh_CN.po
@@ -0,0 +1,22 @@
+# SOME DESCRIPTIVE TITLE.
+# Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
+# This file is distributed under the same license as the fcitx5-quwei package.
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: fcitx5-quwei\n"
+"Report-Msgid-Bugs-To: fcitx-dev@googlegroups.com\n"
+"POT-Creation-Date: 2021-11-16 10:07-0800\n"
+"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
+"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language-Team: LANGUAGE <LL@li.org>\n"
+"Language: LANG\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=utf-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+
+#. Translatable name of the input method
+#: build/src/quwei-addon.conf.in:3 src/quwei-addon.conf.in.in:3
+#: src/quwei.conf.in:4
+msgid "Quwei"
+msgstr ""
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 37188b5..44a2155 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,13 +1,14 @@
 # Make sure it produce quwei.so instead of libquwei.so
 add_library(quwei SHARED quwei.cpp)
 target_link_libraries(quwei PRIVATE Fcitx5::Core)
-set_target_properties(quwei PROPERTIES PREFIX "")
 install(TARGETS quwei DESTINATION "${FCITX_INSTALL_LIBDIR}/fcitx5")
 
 # Addon config file
 # We need additional layer of conversion because we want PROJECT_VERSION in it.
-configure_file(quwei-addon.conf.in quwei-addon.conf)
+configure_file(quwei-addon.conf.in.in quwei-addon.conf.in)
+fcitx5_translate_desktop_file("${CMAKE_CURRENT_BINARY_DIR}/quwei-addon.conf.in" quwei-addon.conf)
 install(FILES "${CMAKE_CURRENT_BINARY_DIR}/quwei-addon.conf" RENAME quwei.conf DESTINATION "${FCITX_INSTALL_PKGDATADIR}/addon")
 
 # Input Method registration file
-install(FILES "quwei.conf" DESTINATION "${FCITX_INSTALL_PKGDATADIR}/inputmethod")
+fcitx5_translate_desktop_file(quwei.conf.in quwei.conf)
+install(FILES "${CMAKE_CURRENT_BINARY_DIR}/quwei.conf" DESTINATION "${FCITX_INSTALL_PKGDATADIR}/inputmethod")
diff --git a/src/quwei-addon.conf.in b/src/quwei-addon.conf.in.in
similarity index 92%
rename from src/quwei-addon.conf.in
rename to src/quwei-addon.conf.in.in
index e605629..66bdaac 100644
--- a/src/quwei-addon.conf.in
+++ b/src/quwei-addon.conf.in.in
@@ -2,7 +2,7 @@
 Name=Quwei
 Category=InputMethod
 Version=@PROJECT_VERSION@
-Library=quwei
+Library=libquwei
 Type=SharedLibrary
 OnDemand=True
 Configurable=True
diff --git a/src/quwei.conf b/src/quwei.conf.in
similarity index 100%
rename from src/quwei.conf
rename to src/quwei.conf.in
diff --git a/src/quwei.cpp b/src/quwei.cpp
index 29505a8..4ee6741 100644
--- a/src/quwei.cpp
+++ b/src/quwei.cpp
@@ -5,11 +5,272 @@
  *
  */
 #include "quwei.h"
+#include <fcitx-utils/utf8.h>
+#include <fcitx/candidatelist.h>
+#include <fcitx/inputpanel.h>
+#include <fcitx/instance.h>
+#include <fcitx/userinterfacemanager.h>
+#include <utility>
+
+namespace {
+
+// Template to help resolve iconv parameter issue on BSD.
+template <class T>
+struct function_traits;
+
+// partial specialization for function pointer
+template <class R, class... Args>
+struct function_traits<R (*)(Args...)> {
+    using result_type = R;
+    using argument_types = std::tuple<Args...>;
+};
+
+template <class T>
+using second_argument_type = typename std::tuple_element<
+    1, typename function_traits<T>::argument_types>::type;
+
+static const std::array<fcitx::Key, 10> selectionKeys = {
+    fcitx::Key{FcitxKey_1}, fcitx::Key{FcitxKey_2}, fcitx::Key{FcitxKey_3},
+    fcitx::Key{FcitxKey_4}, fcitx::Key{FcitxKey_5}, fcitx::Key{FcitxKey_6},
+    fcitx::Key{FcitxKey_7}, fcitx::Key{FcitxKey_8}, fcitx::Key{FcitxKey_9},
+    fcitx::Key{FcitxKey_0},
+};
+
+class QuweiCandidateWord : public fcitx::CandidateWord {
+public:
+    QuweiCandidateWord(QuweiEngine *engine, std::string text)
+        : engine_(engine) {
+        setText(fcitx::Text(std::move(text)));
+    }
+
+    void select(fcitx::InputContext *inputContext) const override {
+        inputContext->commitString(text().toString());
+        auto state = inputContext->propertyFor(engine_->factory());
+        state->reset();
+    }
+
+private:
+    QuweiEngine *engine_;
+};
+
+class QuweiCandidateList : public fcitx::CandidateList,
+                           public fcitx::PageableCandidateList,
+                           public fcitx::CursorMovableCandidateList {
+public:
+    QuweiCandidateList(QuweiEngine *engine, fcitx::InputContext *ic,
+                       const std::string &code)
+        : engine_(engine), ic_(ic), code_(std::stoi(code)) {
+        setPageable(this);
+        setCursorMovable(this);
+        for (int i = 0; i < 10; i++) {
+            const char label[2] = {static_cast<char>('0' + (i + 1) % 10), '\0'};
+            labels_[i].append(label);
+            labels_[i].append(". ");
+        }
+        generate();
+    }
+
+    const fcitx::Text &label(int idx) const override { return labels_[idx]; }
+
+    const fcitx::CandidateWord &candidate(int idx) const override {
+        return *candidates_[idx];
+    }
+    int size() const override { return 10; }
+    fcitx::CandidateLayoutHint layoutHint() const override {
+        return fcitx::CandidateLayoutHint::NotSet;
+    }
+    bool usedNextBefore() const override { return false; }
+    void prev() override {
+        if (!hasPrev()) {
+            return;
+        }
+        --code_;
+        auto state = ic_->propertyFor(engine_->factory());
+        state->setCode(code_);
+    }
+    void next() override {
+        if (!hasNext()) {
+            return;
+        }
+        code_++;
+        auto state = ic_->propertyFor(engine_->factory());
+        state->setCode(code_);
+    }
+
+    bool hasPrev() const override { return code_ > 0; }
+
+    bool hasNext() const override { return code_ < 999; }
+
+    void prevCandidate() override { cursor_ = (cursor_ + 9) % 10; }
+
+    void nextCandidate() override { cursor_ = (cursor_ + 1) % 10; }
+
+    int cursorIndex() const override { return cursor_; }
+
+private:
+    void generate() {
+        for (int i = 0; i < 10; i++) {
+            auto code = code_ * 10 + (i + 1);
+            auto qu = code / 100;
+            auto wei = code % 100;
+
+            // Quwei to GB2312 (0xA0 + qu, 0xA0 + wei)
+            char in[3];
+            if (qu >= 95) { /* Process extend Qu 95 and 96 */
+                in[0] = qu - 95 + 0xA8;
+                in[1] = wei + 0x40;
+
+                /* skip 0xa87f and 0xa97f */
+                if (in[1] >= 0x7f) {
+                    in[1]++;
+                }
+            } else {
+                in[0] = qu + 0xa0;
+                in[1] = wei + 0xa0;
+            }
+
+            size_t insize = 2, avail = FCITX_UTF8_MAX_LENGTH + 1;
+            std::remove_pointer_t<second_argument_type<decltype(&::iconv)>>
+                inbuf = in;
+
+            char out[FCITX_UTF8_MAX_LENGTH + 1];
+            char *outbuf = out;
+            iconv(engine_->conv(), &inbuf, &insize, &outbuf, &avail);
+            *outbuf = '\0';
+            candidates_[i] = std::make_unique<QuweiCandidateWord>(engine_, out);
+        }
+    }
+
+    QuweiEngine *engine_;
+    fcitx::InputContext *ic_;
+    fcitx::Text labels_[10];
+    std::unique_ptr<QuweiCandidateWord> candidates_[10];
+    int code_;
+    int cursor_ = 0;
+};
+
+} // namespace
+
+void QuweiState::keyEvent(fcitx::KeyEvent &event) {
+    if (auto candidateList = ic_->inputPanel().candidateList()) {
+        int idx = event.key().keyListIndex(selectionKeys);
+        if (idx >= 0 && idx < candidateList->size()) {
+            event.accept();
+            candidateList->candidate(idx).select(ic_);
+            return;
+        }
+        if (event.key().checkKeyList(
+                engine_->instance()->globalConfig().defaultPrevPage())) {
+            if (auto *pageable = candidateList->toPageable();
+                pageable && pageable->hasPrev()) {
+                event.accept();
+                pageable->prev();
+                ic_->updateUserInterface(
+                    fcitx::UserInterfaceComponent::InputPanel);
+            }
+            return event.filterAndAccept();
+        }
+
+        if (event.key().checkKeyList(
+                engine_->instance()->globalConfig().defaultNextPage())) {
+            if (auto *pageable = candidateList->toPageable();
+                pageable && pageable->hasNext()) {
+                pageable->next();
+                ic_->updateUserInterface(
+                    fcitx::UserInterfaceComponent::InputPanel);
+            }
+            return event.filterAndAccept();
+        }
+    }
+
+    if (buffer_.empty()) {
+        if (!event.key().isDigit()) {
+            return;
+        }
+    } else {
+        if (event.key().check(FcitxKey_BackSpace)) {
+            buffer_.backspace();
+            updateUI();
+            return event.filterAndAccept();
+        }
+        if (event.key().check(FcitxKey_Return)) {
+            ic_->commitString(buffer_.userInput());
+            reset();
+            return event.filterAndAccept();
+        }
+        if (event.key().check(FcitxKey_Escape)) {
+            reset();
+            return event.filterAndAccept();
+        }
+        if (!event.key().isDigit()) {
+            return event.filterAndAccept();
+        }
+    }
+
+    buffer_.type(event.key().sym());
+    updateUI();
+    return event.filterAndAccept();
+}
+
+void QuweiState::setCode(int code) {
+    if (code < 0 || code > 999) {
+        return;
+    }
+    buffer_.clear();
+    auto codeStr = std::to_string(code);
+    while (codeStr.size() < 3) {
+        codeStr = "0" + codeStr;
+    }
+    buffer_.type(std::to_string(code));
+    updateUI();
+}
+
+void QuweiState::updateUI() {
+    auto &inputPanel = ic_->inputPanel();
+    inputPanel.reset();
+    if (buffer_.size() == 3) {
+        inputPanel.setCandidateList(std::make_unique<QuweiCandidateList>(
+            engine_, ic_, buffer_.userInput()));
+    }
+    if (ic_->capabilityFlags().test(fcitx::CapabilityFlag::Preedit)) {
+        fcitx::Text preedit(buffer_.userInput(),
+                            fcitx::TextFormatFlag::HighLight);
+        inputPanel.setClientPreedit(preedit);
+    } else {
+        fcitx::Text preedit(buffer_.userInput());
+        inputPanel.setPreedit(preedit);
+    }
+    ic_->updateUserInterface(fcitx::UserInterfaceComponent::InputPanel);
+    ic_->updatePreedit();
+}
+
+QuweiEngine::QuweiEngine(fcitx::Instance *instance)
+    : instance_(instance), factory_([this](fcitx::InputContext &ic) {
+          return new QuweiState(this, &ic);
+      }) {
+    conv_ = iconv_open("UTF-8", "GB18030");
+    if (conv_ == reinterpret_cast<iconv_t>(-1)) {
+        throw std::runtime_error("Failed to create converter");
+    }
+    instance->inputContextManager().registerProperty("quweiState", &factory_);
+}
 
 void QuweiEngine::keyEvent(const fcitx::InputMethodEntry &entry,
                            fcitx::KeyEvent &keyEvent) {
     FCITX_UNUSED(entry);
-    FCITX_INFO() << keyEvent.key() << " isRelease=" << keyEvent.isRelease();
+    if (keyEvent.isRelease() || keyEvent.key().states()) {
+        return;
+    }
+    // FCITX_INFO() << keyEvent.key() << " isRelease=" << keyEvent.isRelease();
+    auto ic = keyEvent.inputContext();
+    auto *state = ic->propertyFor(&factory_);
+    state->keyEvent(keyEvent);
+}
+
+void QuweiEngine::reset(const fcitx::InputMethodEntry &,
+                        fcitx::InputContextEvent &event) {
+    auto *state = event.inputContext()->propertyFor(&factory_);
+    state->reset();
 }
 
 FCITX_ADDON_FACTORY(QuweiEngineFactory);
diff --git a/src/quwei.h b/src/quwei.h
index 39bc2ea..b2dbcf8 100644
--- a/src/quwei.h
+++ b/src/quwei.h
@@ -7,18 +7,62 @@
 #ifndef _FCITX5_QUWEI_QUWEI_H_
 #define _FCITX5_QUWEI_QUWEI_H_
 
+#include <fcitx-utils/inputbuffer.h>
 #include <fcitx/addonfactory.h>
+#include <fcitx/addonmanager.h>
+#include <fcitx/inputcontext.h>
+#include <fcitx/inputcontextproperty.h>
 #include <fcitx/inputmethodengine.h>
+#include <fcitx/inputpanel.h>
+#include <fcitx/instance.h>
+#include <iconv.h>
+
+class QuweiEngine;
+
+class QuweiState : public fcitx::InputContextProperty {
+public:
+    QuweiState(QuweiEngine *engine, fcitx::InputContext *ic)
+        : engine_(engine), ic_(ic) {}
+
+    void keyEvent(fcitx::KeyEvent &keyEvent);
+    void setCode(int code);
+    void updateUI();
+    void reset() {
+        buffer_.clear();
+        updateUI();
+    }
+
+private:
+    QuweiEngine *engine_;
+    fcitx::InputContext *ic_;
+    fcitx::InputBuffer buffer_{{fcitx::InputBufferOption::AsciiOnly,
+                                fcitx::InputBufferOption::FixedCursor}};
+};
 
 class QuweiEngine : public fcitx::InputMethodEngineV2 {
+public:
+    QuweiEngine(fcitx::Instance *instance);
+
     void keyEvent(const fcitx::InputMethodEntry &entry,
                   fcitx::KeyEvent &keyEvent) override;
+
+    void reset(const fcitx::InputMethodEntry &,
+               fcitx::InputContextEvent &event) override;
+
+    auto factory() const { return &factory_; }
+    auto conv() const { return conv_; }
+    auto instance() const { return instance_; }
+
+private:
+    fcitx::Instance *instance_;
+    fcitx::FactoryFor<QuweiState> factory_;
+    iconv_t conv_;
 };
 
 class QuweiEngineFactory : public fcitx::AddonFactory {
     fcitx::AddonInstance *create(fcitx::AddonManager *manager) override {
         FCITX_UNUSED(manager);
-        return new QuweiEngine;
+        return new QuweiEngine(manager->instance());
     }
 };