diff options
Diffstat (limited to 'OpenPGP-Keychain/src/org/sufficientlysecure/keychain/util/SectionCursorAdapter.java')
| -rw-r--r-- | OpenPGP-Keychain/src/org/sufficientlysecure/keychain/util/SectionCursorAdapter.java | 266 |
1 files changed, 266 insertions, 0 deletions
diff --git a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/util/SectionCursorAdapter.java b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/util/SectionCursorAdapter.java new file mode 100644 index 000000000..0d4092d9e --- /dev/null +++ b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/util/SectionCursorAdapter.java @@ -0,0 +1,266 @@ +/* + * Copyright (C) 2013 Dominik Schürmann <dominik@dominikschuermann.de> + * Copyright (C) 2011 Gonçalo Ferreira + * + * 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 org.sufficientlysecure.keychain.util; + +import java.util.LinkedHashMap; + +import android.content.Context; +import android.database.Cursor; +import android.database.DataSetObserver; +import android.support.v4.widget.CursorAdapter; +import android.util.Log; +import android.view.LayoutInflater; +import android.view.View; +import android.view.ViewGroup; +import android.widget.TextView; + +/** + * Originally from https://github.com/monxalo/android-section-adapter + * + * getCustomGroup() has been modified + */ +public abstract class SectionCursorAdapter extends CursorAdapter { + + private static final String TAG = "SectionCursorAdapter"; + private static final boolean LOGV = false; + + private static final int TYPE_NORMAL = 1; + private static final int TYPE_HEADER = 0; + private static final int TYPE_COUNT = 2; + + private final int mHeaderRes; + private final int mGroupColumn; + private final LayoutInflater mLayoutInflater; + + private LinkedHashMap<Integer, String> sectionsIndexer; + + public static class ViewHolder { + public TextView textView; + } + + public SectionCursorAdapter(Context context, Cursor c, int headerLayout, int groupColumn) { + super(context, c, 0); + + sectionsIndexer = new LinkedHashMap<Integer, String>(); + + mHeaderRes = headerLayout; + mGroupColumn = groupColumn; + mLayoutInflater = LayoutInflater.from(context); + + if (c != null) { + calculateSectionHeaders(); + c.registerDataSetObserver(mDataSetObserver); + } + } + + private DataSetObserver mDataSetObserver = new DataSetObserver() { + public void onChanged() { + calculateSectionHeaders(); + }; + + public void onInvalidated() { + sectionsIndexer.clear(); + }; + }; + + /** + * <p> + * This method serve as an intercepter before the sections are calculated so you can transform + * some computer data into human readable, e.g. format a unix timestamp, or a status. + * </p> + * + * <p> + * By default this method returns the original data for the group column. + * </p> + * + * @param groupData + * @return + */ + protected String getCustomGroup(String groupData) { + return groupData.substring(0, 1); + } + + private void calculateSectionHeaders() { + int i = 0; + + String previous = ""; + int count = 0; + + final Cursor c = getCursor(); + + sectionsIndexer.clear(); + + if (c == null) { + return; + } + + c.moveToPosition(-1); + + while (c.moveToNext()) { + final String group = getCustomGroup(c.getString(mGroupColumn)); + + if (!previous.equals(group)) { + sectionsIndexer.put(i + count, group); + previous = group; + + if (LOGV) + Log.v(TAG, "Group " + group + "at position: " + (i + count)); + + count++; + } + + i++; + } + } + + public String getGroupCustomFormat(Object obj) { + return null; + } + + @Override + public View getView(int position, View convertView, ViewGroup parent) { + int viewType = getItemViewType(position); + + if (viewType == TYPE_NORMAL) { + Cursor c = (Cursor) getItem(position); + + if (c == null) { + if (LOGV) + Log.d(TAG, "getItem(" + position + ") = null"); + return mLayoutInflater.inflate(mHeaderRes, parent, false); + } + + final int mapCursorPos = getSectionForPosition(position); + c.moveToPosition(mapCursorPos); + + return super.getView(mapCursorPos, convertView, parent); + } else { + ViewHolder holder = null; + + if (convertView == null) { + if (LOGV) + Log.v(TAG, "Creating new view for section"); + + holder = new ViewHolder(); + convertView = mLayoutInflater.inflate(mHeaderRes, parent, false); + holder.textView = (TextView) convertView; + + convertView.setTag(holder); + } else { + if (LOGV) + Log.v(TAG, "Reusing view for section"); + + holder = (ViewHolder) convertView.getTag(); + } + + TextView sectionText = holder.textView; + + final String group = sectionsIndexer.get(position); + final String customFormat = getGroupCustomFormat(group); + + sectionText.setText(customFormat == null ? group : customFormat); + + return sectionText; + } + } + + @Override + public int getViewTypeCount() { + return TYPE_COUNT; + } + + @Override + public int getCount() { + return super.getCount() + sectionsIndexer.size(); + } + + @Override + public boolean isEnabled(int position) { + return getItemViewType(position) == TYPE_NORMAL; + } + + public int getPositionForSection(int section) { + if (sectionsIndexer.containsKey(section)) { + return section + 1; + } + return section; + } + + public int getSectionForPosition(int position) { + int offset = 0; + for (Integer key : sectionsIndexer.keySet()) { + if (position > key) { + offset++; + } else { + break; + } + } + + return position - offset; + } + + @Override + public Object getItem(int position) { + if (getItemViewType(position) == TYPE_NORMAL) { + return super.getItem(getSectionForPosition(position)); + } + return super.getItem(position); + } + + @Override + public long getItemId(int position) { + if (getItemViewType(position) == TYPE_NORMAL) { + return super.getItemId(getSectionForPosition(position)); + } + return super.getItemId(position); + } + + @Override + public int getItemViewType(int position) { + if (position == getPositionForSection(position)) { + return TYPE_NORMAL; + } + return TYPE_HEADER; + } + + @Override + public void changeCursor(Cursor cursor) { + final Cursor old = swapCursor(cursor); + + if (old != null) { + old.close(); + } + } + + @Override + public Cursor swapCursor(Cursor newCursor) { + if (getCursor() != null) { + getCursor().unregisterDataSetObserver(mDataSetObserver); + } + + final Cursor oldCursor = super.swapCursor(newCursor); + + calculateSectionHeaders(); + + if (newCursor != null) { + newCursor.registerDataSetObserver(mDataSetObserver); + } + + return oldCursor; + } +}
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