Satoshi Kataoka | d7443c8 | 2013-10-15 17:45:43 +0900 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 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.internal.inputmethod; |
| 18 | |
| 19 | import android.util.Slog; |
| 20 | import android.view.inputmethod.InputMethodInfo; |
| 21 | import android.view.inputmethod.InputMethodSubtype; |
| 22 | |
| 23 | import java.util.ArrayDeque; |
| 24 | |
| 25 | /** |
| 26 | * InputMethodSubtypeSwitchingController controls the switching behavior of the subtypes. |
| 27 | */ |
| 28 | public class InputMethodSubtypeSwitchingController { |
| 29 | private static final String TAG = InputMethodSubtypeSwitchingController.class.getSimpleName(); |
| 30 | private static final boolean DEBUG = false; |
| 31 | private static final int MAX_HISTORY_SIZE = 4; |
| 32 | private static class SubtypeParams { |
| 33 | public final InputMethodInfo mImi; |
| 34 | public final InputMethodSubtype mSubtype; |
| 35 | public final long mTime; |
| 36 | public SubtypeParams(InputMethodInfo imi, InputMethodSubtype subtype) { |
| 37 | mImi = imi; |
| 38 | mSubtype = subtype; |
| 39 | mTime = System.currentTimeMillis(); |
| 40 | } |
| 41 | } |
| 42 | |
| 43 | private final ArrayDeque<SubtypeParams> mTypedSubtypeHistory = new ArrayDeque<SubtypeParams>(); |
| 44 | |
| 45 | // TODO: write unit tests for this method and the logic that determines the next subtype |
| 46 | public void onCommitText(InputMethodInfo imi, InputMethodSubtype subtype) { |
| 47 | synchronized(mTypedSubtypeHistory) { |
| 48 | if (subtype == null) { |
| 49 | Slog.w(TAG, "Invalid InputMethodSubtype: " + imi.getId() + ", " + subtype); |
| 50 | return; |
| 51 | } |
| 52 | if (DEBUG) { |
| 53 | Slog.d(TAG, "onCommitText: " + imi.getId() + ", " + subtype); |
| 54 | } |
| 55 | if (!imi.supportsSwitchingToNextInputMethod()) { |
| 56 | Slog.w(TAG, imi.getId() + " doesn't support switching to next input method."); |
| 57 | return; |
| 58 | } |
| 59 | if (mTypedSubtypeHistory.size() >= MAX_HISTORY_SIZE) { |
| 60 | mTypedSubtypeHistory.poll(); |
| 61 | } |
| 62 | mTypedSubtypeHistory.addFirst(new SubtypeParams(imi, subtype)); |
| 63 | } |
| 64 | } |
| 65 | } |