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
17package com.android.inputmethod.keyboard.internal;
18
19import 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