/*
* Copyright (C) 2014 Dominik Schürmann <dominik@dominikschuermann.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.sufficientlysecure.keychain.ui.widget;
import android.content.Context;
import android.database.Cursor;
import android.os.Bundle;
import android.os.Parcelable;
import android.support.annotation.NonNull;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.Loader;
import android.support.v7.widget.AppCompatSpinner;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.SpinnerAdapter;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.R;
import org.sufficientlysecure.keychain.provider.KeychainContract;
import org.sufficientlysecure.keychain.ui.adapter.KeyAdapter;
import org.sufficientlysecure.keychain.ui.adapter.KeyAdapter.KeyItem;
/**
* Use AppCompatSpinner from AppCompat lib instead of Spinner. Fixes white dropdown icon.
* Related: http://stackoverflow.com/a/27713090
*/
public abstract class KeySpinner extends AppCompatSpinner implements
LoaderManager.LoaderCallbacks<Cursor> {
public static final String ARG_SUPER_STATE = "super_state";
public static final String ARG_KEY_ID = "key_id";
public interface OnKeyChangedListener {
void onKeyChanged(long masterKeyId);
}
protected long mPreSelectedKeyId = Constants.key.none;
protected SelectKeyAdapter mAdapter = new SelectKeyAdapter();
protected OnKeyChangedListener mListener;
// this shall note collide with other loaders inside the activity
protected int LOADER_ID = 2343;
public KeySpinner(Context context) {
super(context);
initView();
}
public KeySpinner(Context context, AttributeSet attrs) {
super(context, attrs);
initView();
}
public KeySpinner(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initView();
}
private void initView() {
setAdapter(mAdapter);
super.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
if (mListener != null) {
mListener.onKeyChanged(id);
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
if (mListener != null) {
mListener.onKeyChanged(Constants.key.none);
}
}
});
}
@Override
public void setOnItemSelectedListener(OnItemSelectedListener listener) {
throw new UnsupportedOperationException();
}
public void setOnKeyChangedListener(OnKeyChangedListener listener) {
mListener = listener;
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
reload();
}
public void reload() {
if (getContext() instanceof FragmentActivity) {
((FragmentActivity) getContext()).getSupportLoaderManager().restartLoader(LOADER_ID, null, this);
} else {
throw new AssertionError("KeySpinner must be attached to FragmentActivity, this is "
+ getContext().getClass());
}
}
@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
if (loader.getId() == LOADER_ID) {
mAdapter.swapCursor(data);
}
}
@Override
public void onLoaderReset(Loader<Cursor> loader) {
if (loader.getId() == LOADER_ID) {
mAdapter.swapCursor(null);
}
}
public long getSelectedKeyId() {
Object item = getSelectedItem();
if (item instanceof KeyItem) {
return ((KeyItem) item).mKeyId;
}
return Constants.key.none;
}
public void setPreSelectedKeyId(long selectedKeyId) {
mPreSelectedKeyId = selectedKeyId;
}
protected class SelectKeyAdapter extends BaseAdapter implements SpinnerAdapter {
private KeyAdapter inner;
private int mIndexMasterKeyId;
public SelectKeyAdapter() {
inner = new KeyAdapter(getContext(), null, 0) {
@Override
public boolean isEnabled(Cursor cursor) {
return KeySpinner.this.isItemEnabled(cursor);
}
};
}
public Cursor swapCursor(Cursor newCursor) {
if (newCursor == null) return inner.swapCursor(null);
mIndexMasterKeyId = newCursor.getColumnIndex(KeychainContract.KeyRings.MASTER_KEY_ID);
Cursor oldCursor = inner.swapCursor(newCursor);
// pre-select key if mPreSelectedKeyId is given
if (mPreSelectedKeyId != Constants.key.none && newCursor.moveToFirst()) {
do {
if (newCursor.getLong(mIndexMasterKeyId) == mPreSelectedKeyId) {
setSelection(newCursor.getPosition() +1);
}
} while (newCursor.moveToNext());
}
return oldCursor;
}
@Override
public int getCount() {
return inner.getCount() +1;
}
@Override
public Object getItem(int position) {
if (position == 0) {
return null;
}
return inner.getItem(position -1);
}
@Override
public long getItemId(int position) {
if (position == 0) {
return Constants.key.none;
}
return inner.getItemId(position -1);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// Unfortunately, SpinnerAdapter does not support multiple view
// types. For this reason, we throw away convertViews of a bad
// type. This is sort of a hack, but since the number of elements
// we deal with in KeySpinners is usually very small (number of
// secret keys), this is the easiest solution. (I'm sorry.)
if (convertView != null) {
// This assumes that the inner view has non-null tags on its views!
boolean isWrongType = (convertView.getTag() == null) != (position == 0);
if (isWrongType) {
convertView = null;
}
}
if (position > 0) {
return inner.getView(position -1, convertView, parent);
}
return convertView != null ? convertView :
LayoutInflater.from(getContext()).inflate(
R.layout.keyspinner_item_none, parent, false);
}
}
boolean isItemEnabled(Cursor cursor) {
return true;
}
@Override
public void onRestoreInstanceState(Parcelable state) {
Bundle bundle = (Bundle) state;
mPreSelectedKeyId = bundle.getLong(ARG_KEY_ID);
// restore super state
super.onRestoreInstanceState(bundle.getParcelable(ARG_SUPER_STATE));
}
@NonNull
@Override
public Parcelable onSaveInstanceState() {
Bundle bundle = new Bundle();
// save super state
bundle.putParcelable(ARG_SUPER_STATE, super.onSaveInstanceState());
bundle.putLong(ARG_KEY_ID, getSelectedKeyId());
return bundle;
}
}