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      1 /*
      2  * Copyright (C) 2009 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.inputmethod.pinyin;
     18 
     19 import android.view.KeyEvent;
     20 import android.view.inputmethod.InputConnection;
     21 
     22 /**
     23  * Class to handle English input.
     24  */
     25 public class EnglishInputProcessor {
     26 
     27     private int mLastKeyCode = KeyEvent.KEYCODE_UNKNOWN;
     28 
     29     public boolean processKey(InputConnection inputContext, KeyEvent event,
     30             boolean upperCase, boolean realAction) {
     31         if (null == inputContext || null == event) return false;
     32 
     33         int keyCode = event.getKeyCode();
     34 
     35         CharSequence prefix = null;
     36         prefix = inputContext.getTextBeforeCursor(2, 0);
     37 
     38         int keyChar;
     39         keyChar = 0;
     40         if (keyCode >= KeyEvent.KEYCODE_A && keyCode <= KeyEvent.KEYCODE_Z) {
     41             keyChar = keyCode - KeyEvent.KEYCODE_A + 'a';
     42             if (upperCase) {
     43                 keyChar = keyChar + 'A' - 'a';
     44             }
     45         } else if (keyCode >= KeyEvent.KEYCODE_0
     46                 && keyCode <= KeyEvent.KEYCODE_9)
     47             keyChar = keyCode - KeyEvent.KEYCODE_0 + '0';
     48         else if (keyCode == KeyEvent.KEYCODE_COMMA)
     49             keyChar = ',';
     50         else if (keyCode == KeyEvent.KEYCODE_PERIOD)
     51             keyChar = '.';
     52         else if (keyCode == KeyEvent.KEYCODE_APOSTROPHE)
     53             keyChar = '\'';
     54         else if (keyCode == KeyEvent.KEYCODE_AT)
     55             keyChar = '@';
     56         else if (keyCode == KeyEvent.KEYCODE_SLASH) keyChar = '/';
     57 
     58         if (0 == keyChar) {
     59             mLastKeyCode = keyCode;
     60 
     61             String insert = null;
     62             if (KeyEvent.KEYCODE_DEL == keyCode) {
     63                 if (realAction)  {
     64                     inputContext.deleteSurroundingText(1, 0);
     65                 }
     66             } else if (KeyEvent.KEYCODE_ENTER == keyCode) {
     67                 insert = "\n";
     68             } else if (KeyEvent.KEYCODE_SPACE == keyCode) {
     69                 insert = " ";
     70             } else {
     71                 return false;
     72             }
     73 
     74             if (null != insert && realAction)
     75                 inputContext.commitText(insert, insert.length());
     76 
     77             return true;
     78         }
     79 
     80         if (!realAction)
     81             return true;
     82 
     83         if (KeyEvent.KEYCODE_SHIFT_LEFT == mLastKeyCode
     84                 || KeyEvent.KEYCODE_SHIFT_LEFT == mLastKeyCode) {
     85             if (keyChar >= 'a' && keyChar <= 'z')
     86                 keyChar = keyChar - 'a' + 'A';
     87         } else if (KeyEvent.KEYCODE_ALT_LEFT == mLastKeyCode) {
     88         }
     89 
     90         String result = String.valueOf((char) keyChar);
     91         inputContext.commitText(result, result.length());
     92         mLastKeyCode = keyCode;
     93         return true;
     94     }
     95 }
     96