| /* |
| * Copyright (C) 2007 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 android.preference; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| |
| import android.os.Handler; |
| import android.preference.Preference.OnPreferenceChangeInternalListener; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.widget.Adapter; |
| import android.widget.BaseAdapter; |
| import android.widget.ListView; |
| |
| /** |
| * An adapter that returns the {@link Preference} contained in this group. |
| * In most cases, this adapter should be the base class for any custom |
| * adapters from {@link Preference#getAdapter()}. |
| * <p> |
| * This adapter obeys the |
| * {@link Preference}'s adapter rule (the |
| * {@link Adapter#getView(int, View, ViewGroup)} should be used instead of |
| * {@link Preference#getView(ViewGroup)} if a {@link Preference} has an |
| * adapter via {@link Preference#getAdapter()}). |
| * <p> |
| * This adapter also propagates data change/invalidated notifications upward. |
| * <p> |
| * This adapter does not include this {@link PreferenceGroup} in the returned |
| * adapter, use {@link PreferenceCategoryAdapter} instead. |
| * |
| * @see PreferenceCategoryAdapter |
| */ |
| class PreferenceGroupAdapter extends BaseAdapter implements OnPreferenceChangeInternalListener { |
| |
| private static final String TAG = "PreferenceGroupAdapter"; |
| |
| /** |
| * The group that we are providing data from. |
| */ |
| private PreferenceGroup mPreferenceGroup; |
| |
| /** |
| * Maps a position into this adapter -> {@link Preference}. These |
| * {@link Preference}s don't have to be direct children of this |
| * {@link PreferenceGroup}, they can be grand children or younger) |
| */ |
| private List<Preference> mPreferenceList; |
| |
| /** |
| * List of unique Preference and its subclasses' names. This is used to find |
| * out how many types of views this adapter can return. Once the count is |
| * returned, this cannot be modified (since the ListView only checks the |
| * count once--when the adapter is being set). We will not recycle views for |
| * Preference subclasses seen after the count has been returned. |
| */ |
| private List<String> mPreferenceClassNames; |
| |
| /** |
| * Blocks the mPreferenceClassNames from being changed anymore. |
| */ |
| private boolean mHasReturnedViewTypeCount = false; |
| |
| private volatile boolean mIsSyncing = false; |
| |
| private Handler mHandler = new Handler(); |
| |
| private Runnable mSyncRunnable = new Runnable() { |
| public void run() { |
| syncMyPreferences(); |
| } |
| }; |
| |
| public PreferenceGroupAdapter(PreferenceGroup preferenceGroup) { |
| mPreferenceGroup = preferenceGroup; |
| // If this group gets or loses any children, let us know |
| mPreferenceGroup.setOnPreferenceChangeInternalListener(this); |
| |
| mPreferenceList = new ArrayList<Preference>(); |
| mPreferenceClassNames = new ArrayList<String>(); |
| |
| syncMyPreferences(); |
| } |
| |
| private void syncMyPreferences() { |
| synchronized(this) { |
| if (mIsSyncing) { |
| return; |
| } |
| |
| mIsSyncing = true; |
| } |
| |
| List<Preference> newPreferenceList = new ArrayList<Preference>(mPreferenceList.size()); |
| flattenPreferenceGroup(newPreferenceList, mPreferenceGroup); |
| mPreferenceList = newPreferenceList; |
| |
| notifyDataSetChanged(); |
| |
| synchronized(this) { |
| mIsSyncing = false; |
| notifyAll(); |
| } |
| } |
| |
| private void flattenPreferenceGroup(List<Preference> preferences, PreferenceGroup group) { |
| // TODO: shouldn't always? |
| group.sortPreferences(); |
| |
| final int groupSize = group.getPreferenceCount(); |
| for (int i = 0; i < groupSize; i++) { |
| final Preference preference = group.getPreference(i); |
| |
| preferences.add(preference); |
| |
| if (!mHasReturnedViewTypeCount) { |
| addPreferenceClassName(preference); |
| } |
| |
| if (preference instanceof PreferenceGroup) { |
| final PreferenceGroup preferenceAsGroup = (PreferenceGroup) preference; |
| if (preferenceAsGroup.isOnSameScreenAsChildren()) { |
| flattenPreferenceGroup(preferences, preferenceAsGroup); |
| } |
| } |
| |
| preference.setOnPreferenceChangeInternalListener(this); |
| } |
| } |
| |
| private void addPreferenceClassName(Preference preference) { |
| final String name = preference.getClass().getName(); |
| int insertPos = Collections.binarySearch(mPreferenceClassNames, name); |
| |
| // Only insert if it doesn't exist (when it is negative). |
| if (insertPos < 0) { |
| // Convert to insert index |
| insertPos = insertPos * -1 - 1; |
| mPreferenceClassNames.add(insertPos, name); |
| } |
| } |
| |
| public int getCount() { |
| return mPreferenceList.size(); |
| } |
| |
| public Preference getItem(int position) { |
| if (position < 0 || position >= getCount()) return null; |
| return mPreferenceList.get(position); |
| } |
| |
| public long getItemId(int position) { |
| if (position < 0 || position >= getCount()) return ListView.INVALID_ROW_ID; |
| return this.getItem(position).getId(); |
| } |
| |
| public View getView(int position, View convertView, ViewGroup parent) { |
| final Preference preference = this.getItem(position); |
| |
| if (preference.hasSpecifiedLayout()) { |
| // If the preference had specified a layout (as opposed to the |
| // default), don't use convert views. |
| convertView = null; |
| } else { |
| // TODO: better way of doing this |
| final String name = preference.getClass().getName(); |
| if (Collections.binarySearch(mPreferenceClassNames, name) < 0) { |
| convertView = null; |
| } |
| } |
| |
| return preference.getView(convertView, parent); |
| } |
| |
| @Override |
| public boolean isEnabled(int position) { |
| if (position < 0 || position >= getCount()) return true; |
| return this.getItem(position).isSelectable(); |
| } |
| |
| @Override |
| public boolean areAllItemsEnabled() { |
| // There should always be a preference group, and these groups are always |
| // disabled |
| return false; |
| } |
| |
| public void onPreferenceChange(Preference preference) { |
| notifyDataSetChanged(); |
| } |
| |
| public void onPreferenceHierarchyChange(Preference preference) { |
| mHandler.removeCallbacks(mSyncRunnable); |
| mHandler.post(mSyncRunnable); |
| } |
| |
| @Override |
| public boolean hasStableIds() { |
| return true; |
| } |
| |
| @Override |
| public int getItemViewType(int position) { |
| if (!mHasReturnedViewTypeCount) { |
| mHasReturnedViewTypeCount = true; |
| } |
| |
| final Preference preference = this.getItem(position); |
| if (preference.hasSpecifiedLayout()) { |
| return IGNORE_ITEM_VIEW_TYPE; |
| } |
| |
| final String name = preference.getClass().getName(); |
| int viewType = Collections.binarySearch(mPreferenceClassNames, name); |
| if (viewType < 0) { |
| // This is a class that was seen after we returned the count, so |
| // don't recycle it. |
| return IGNORE_ITEM_VIEW_TYPE; |
| } else { |
| return viewType; |
| } |
| } |
| |
| @Override |
| public int getViewTypeCount() { |
| if (!mHasReturnedViewTypeCount) { |
| mHasReturnedViewTypeCount = true; |
| } |
| |
| return Math.max(1, mPreferenceClassNames.size()); |
| } |
| |
| } |