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/**
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy
* of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package com.android.inputmethod.dictionarypack;
import android.view.View;
import java.util.ArrayList;
import java.util.HashMap;
/**
* Helper class to maintain the interface state of word list preferences.
*
* This is necessary because the views are created on-demand by calling code. There are many
* situations where views are renewed with little relation with user interaction. For example,
* when scrolling, the view is reused so it doesn't keep its state, which means we need to keep
* it separately. Also whenever the underlying dictionary list undergoes a change (for example,
* update the metadata, or finish downloading) the whole list has to be thrown out and recreated
* in case some dictionaries appeared, disappeared, changed states etc.
*/
public class DictionaryListInterfaceState {
static class State {
public boolean mOpen = false;
public int mStatus = MetadataDbHelper.STATUS_UNKNOWN;
}
private HashMap<String, State> mWordlistToState = new HashMap<>();
private ArrayList<View> mViewCache = new ArrayList<>();
public boolean isOpen(final String wordlistId) {
final State state = mWordlistToState.get(wordlistId);
if (null == state) return false;
return state.mOpen;
}
public int getStatus(final String wordlistId) {
final State state = mWordlistToState.get(wordlistId);
if (null == state) return MetadataDbHelper.STATUS_UNKNOWN;
return state.mStatus;
}
public void setOpen(final String wordlistId, final int status) {
final State newState;
final State state = mWordlistToState.get(wordlistId);
newState = null == state ? new State() : state;
newState.mOpen = true;
newState.mStatus = status;
mWordlistToState.put(wordlistId, newState);
}
public void closeAll() {
for (final State state : mWordlistToState.values()) {
state.mOpen = false;
}
}
public View findFirstOrphanedView() {
for (final View v : mViewCache) {
if (null == v.getParent()) return v;
}
return null;
}
public View addToCacheAndReturnView(final View view) {
mViewCache.add(view);
return view;
}
public void removeFromCache(final View view) {
mViewCache.remove(view);
}
}
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