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      1 /*
      2  * Copyright (C) 2010 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.keyboard.internal;
     18 
     19 import android.util.Log;
     20 
     21 /* package */ class ModifierKeyState {
     22     protected static final String TAG = ModifierKeyState.class.getSimpleName();
     23     protected static final boolean DEBUG = false;
     24 
     25     protected static final int RELEASING = 0;
     26     protected static final int PRESSING = 1;
     27     protected static final int CHORDING = 2;
     28 
     29     protected final String mName;
     30     protected int mState = RELEASING;
     31 
     32     public ModifierKeyState(String name) {
     33         mName = name;
     34     }
     35 
     36     public void onPress() {
     37         final int oldState = mState;
     38         mState = PRESSING;
     39         if (DEBUG)
     40             Log.d(TAG, mName + ".onPress: " + toString(oldState) + " > " + this);
     41     }
     42 
     43     public void onRelease() {
     44         final int oldState = mState;
     45         mState = RELEASING;
     46         if (DEBUG)
     47             Log.d(TAG, mName + ".onRelease: " + toString(oldState) + " > " + this);
     48     }
     49 
     50     public void onOtherKeyPressed() {
     51         final int oldState = mState;
     52         if (oldState == PRESSING)
     53             mState = CHORDING;
     54         if (DEBUG)
     55             Log.d(TAG, mName + ".onOtherKeyPressed: " + toString(oldState) + " > " + this);
     56     }
     57 
     58     public boolean isPressing() {
     59         return mState == PRESSING;
     60     }
     61 
     62     public boolean isReleasing() {
     63         return mState == RELEASING;
     64     }
     65 
     66     public boolean isChording() {
     67         return mState == CHORDING;
     68     }
     69 
     70     @Override
     71     public String toString() {
     72         return toString(mState);
     73     }
     74 
     75     protected String toString(int state) {
     76         switch (state) {
     77         case RELEASING: return "RELEASING";
     78         case PRESSING: return "PRESSING";
     79         case CHORDING: return "CHORDING";
     80         default: return "UNKNOWN";
     81         }
     82     }
     83 }
     84