1 /** 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not 5 * use this file except in compliance with the License. You may obtain a copy 6 * 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, WITHOUT 12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 13 * License for the specific language governing permissions and limitations 14 * under the License. 15 */ 16 17 package com.android.inputmethod.dictionarypack; 18 19 import android.view.View; 20 21 import com.android.inputmethod.latin.utils.CollectionUtils; 22 23 import java.util.ArrayList; 24 import java.util.HashMap; 25 26 /** 27 * Helper class to maintain the interface state of word list preferences. 28 * 29 * This is necessary because the views are created on-demand by calling code. There are many 30 * situations where views are renewed with little relation with user interaction. For example, 31 * when scrolling, the view is reused so it doesn't keep its state, which means we need to keep 32 * it separately. Also whenever the underlying dictionary list undergoes a change (for example, 33 * update the metadata, or finish downloading) the whole list has to be thrown out and recreated 34 * in case some dictionaries appeared, disappeared, changed states etc. 35 */ 36 public class DictionaryListInterfaceState { 37 private static class State { 38 public boolean mOpen = false; 39 public int mStatus = MetadataDbHelper.STATUS_UNKNOWN; 40 } 41 42 private HashMap<String, State> mWordlistToState = CollectionUtils.newHashMap(); 43 private ArrayList<View> mViewCache = CollectionUtils.newArrayList(); 44 45 public boolean isOpen(final String wordlistId) { 46 final State state = mWordlistToState.get(wordlistId); 47 if (null == state) return false; 48 return state.mOpen; 49 } 50 51 public int getStatus(final String wordlistId) { 52 final State state = mWordlistToState.get(wordlistId); 53 if (null == state) return MetadataDbHelper.STATUS_UNKNOWN; 54 return state.mStatus; 55 } 56 57 public void setOpen(final String wordlistId, final int status) { 58 final State newState; 59 final State state = mWordlistToState.get(wordlistId); 60 newState = null == state ? new State() : state; 61 newState.mOpen = true; 62 newState.mStatus = status; 63 mWordlistToState.put(wordlistId, newState); 64 } 65 66 public void closeAll() { 67 for (final State state : mWordlistToState.values()) { 68 state.mOpen = false; 69 } 70 } 71 72 public View findFirstOrphanedView() { 73 for (final View v : mViewCache) { 74 if (null == v.getParent()) return v; 75 } 76 return null; 77 } 78 79 public View addToCacheAndReturnView(final View view) { 80 mViewCache.add(view); 81 return view; 82 } 83 84 public void removeFromCache(final View view) { 85 mViewCache.remove(view); 86 } 87 } 88
