diff --git a/scim-wnn/src/preeditor.cpp b/scim-wnn/src/preeditor.cpp
index 1a1e661..a9335b9 100644
--- a/scim-wnn/src/preeditor.cpp
+++ b/scim-wnn/src/preeditor.cpp
@@ -71,21 +71,6 @@
 }
 
 
-/*!
-    \fn PreEditor::insert(char k)
- */
-WideString PreEditor::insert(char k)
-{
-    if (k == 0) return(text);
-    String s;
-    s = k;
-    text = text.substr(0,pos) + utf8_mbstowcs(s) + text.substr(pos);
-    pos ++;
-    return(getText());
-}
-
-
-
 
 /*!
     \fn PreEditor::reset()
@@ -245,3 +230,19 @@
     return(false);
 }
 
+
+
+/*!
+    \fn PreEditor::inputEvent(const KeyEvent &key)
+ */
+bool PreEditor::inputEvent(const KeyEvent &key)
+{
+    if (isprint(key.code)){
+        String s;
+        s = key.get_ascii_code();
+        text = text.substr(0,pos) + utf8_mbstowcs(s) + text.substr(pos);
+        pos ++;
+        return(true);
+    }
+    return(false);
+}
diff --git a/scim-wnn/src/preeditor.h b/scim-wnn/src/preeditor.h
index b9788a9..c14c849 100644
--- a/scim-wnn/src/preeditor.h
+++ b/scim-wnn/src/preeditor.h
@@ -42,7 +42,6 @@
 
     ~PreEditor();
     virtual void clear();
-    virtual WideString insert(char k);
     int getPos();
     virtual void setPos(int p);
     int getTextLength();
@@ -59,6 +58,7 @@
     static void convHanZen(WideString &t);
     static void convZenHan(WideString &t);
     virtual bool cancelEvent();
+    virtual bool inputEvent(const KeyEvent &key);
 
 protected:
     static WideString text;
diff --git a/scim-wnn/src/romkan.cpp b/scim-wnn/src/romkan.cpp
index 1f120c9..50a17e9 100644
--- a/scim-wnn/src/romkan.cpp
+++ b/scim-wnn/src/romkan.cpp
@@ -307,3 +307,17 @@
     }
     return(false);
 }
+
+
+/*!
+    \fn Romkan::inputEvent(const KeyEvent &key)
+ */
+bool Romkan::inputEvent(const KeyEvent &key)
+{
+    if (isprint(key.code) && (!key.is_alt_down()) && (!key.is_control_down())) {
+        if (key.get_ascii_code() == ' ') return(false);
+        insert(key.get_ascii_code());
+        return(true);
+    }
+    return(false);
+}
diff --git a/scim-wnn/src/romkan.h b/scim-wnn/src/romkan.h
index f726019..79bd31f 100644
--- a/scim-wnn/src/romkan.h
+++ b/scim-wnn/src/romkan.h
@@ -39,7 +39,6 @@
 
     ~Romkan();
     virtual void clear();
-    virtual WideString insert(char k);
     virtual void setPos(int p);
     virtual void reset();
     virtual WideString getText(bool hosei = false);
@@ -50,9 +49,11 @@
     virtual bool keyEventHook(const KeyEvent &key);
     virtual String getModeName();
     virtual bool cancelEvent();
+    virtual bool inputEvent(const KeyEvent &key);
 
 protected:
     WideString eval();
+    WideString insert(char k);
 
 protected:
     String buf;
diff --git a/scim-wnn/src/scim_wnn_imengine.cpp b/scim-wnn/src/scim_wnn_imengine.cpp
index 1c03950..4590136 100644
--- a/scim-wnn/src/scim_wnn_imengine.cpp
+++ b/scim-wnn/src/scim_wnn_imengine.cpp
@@ -351,13 +351,8 @@
         updatePreEditor();
         return(true);
     }
-    if (isprint(key.code)) {
-        if (key.mask & (SCIM_KEY_AltMask | SCIM_KEY_ControlMask)) return(false);
-        // �Хåե������λ��ι�Ƭ���ڡ�����ľ�����ϡ�
-        if ((key.code == SCIM_KEY_space) && (!m_preeditor->getTextLength())) return(false);
-        show_preedit_string();
-        SCIM_DEBUG_IMENGINE(1) << key.get_key_string() << "\n";
-        m_preeditor->insert(key.get_ascii_code());
+
+    if (m_preeditor->inputEvent(key)) {
         updatePreEditor();
         return(true);
     }