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/*
* Copyright (C) 2016 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.deskclock.settings;
import android.content.Context;
import androidx.annotation.NonNull;
import androidx.core.content.ContextCompat;
import androidx.preference.DropDownPreference;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import com.android.deskclock.R;
import com.android.deskclock.Utils;
/**
* Bend {@link DropDownPreference} to support
* <a href="https://material.google.com/components/menus.html#menus-behavior">Simple Menus</a>.
*/
public class SimpleMenuPreference extends DropDownPreference {
private SimpleMenuAdapter mAdapter;
public SimpleMenuPreference(Context context) {
this(context, null);
}
public SimpleMenuPreference(Context context, AttributeSet attrs) {
this(context, attrs, R.attr.dropdownPreferenceStyle);
}
public SimpleMenuPreference(Context context, AttributeSet attrs, int defStyle) {
this(context, attrs, defStyle, 0);
}
public SimpleMenuPreference(Context context, AttributeSet attrs, int defStyleAttr,
int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
@Override
protected ArrayAdapter createAdapter() {
mAdapter = new SimpleMenuAdapter(getContext(), R.layout.simple_menu_dropdown_item);
return mAdapter;
}
private static void restoreOriginalOrder(CharSequence[] array,
int lastSelectedOriginalPosition) {
final CharSequence item = array[0];
System.arraycopy(array, 1, array, 0, lastSelectedOriginalPosition);
array[lastSelectedOriginalPosition] = item;
}
private static void swapSelectedToFront(CharSequence[] array, int position) {
final CharSequence item = array[position];
System.arraycopy(array, 0, array, 1, position);
array[0] = item;
}
private static void setSelectedPosition(CharSequence[] array, int lastSelectedOriginalPosition,
int position) {
final CharSequence item = array[position];
restoreOriginalOrder(array, lastSelectedOriginalPosition);
final int originalPosition = Utils.indexOf(array, item);
swapSelectedToFront(array, originalPosition);
}
@Override
public void setSummary(CharSequence summary) {
final CharSequence[] entries = getEntries();
final int index = Utils.indexOf(entries, summary);
if (index == -1) {
throw new IllegalArgumentException("Illegal Summary");
}
final int lastSelectedOriginalPosition = mAdapter.getLastSelectedOriginalPosition();
mAdapter.setSelectedPosition(index);
setSelectedPosition(entries, lastSelectedOriginalPosition, index);
setSelectedPosition(getEntryValues(), lastSelectedOriginalPosition, index);
super.setSummary(summary);
}
private final static class SimpleMenuAdapter extends ArrayAdapter<CharSequence> {
/** The original position of the last selected element */
private int mLastSelectedOriginalPosition = 0;
SimpleMenuAdapter(Context context, int resource) {
super(context, resource);
}
private void restoreOriginalOrder() {
final CharSequence item = getItem(0);
remove(item);
insert(item, mLastSelectedOriginalPosition);
}
private void swapSelectedToFront(int position) {
final CharSequence item = getItem(position);
remove(item);
insert(item, 0);
mLastSelectedOriginalPosition = position;
}
int getLastSelectedOriginalPosition() {
return mLastSelectedOriginalPosition;
}
void setSelectedPosition(int position) {
setNotifyOnChange(false);
final CharSequence item = getItem(position);
restoreOriginalOrder();
final int originalPosition = getPosition(item);
swapSelectedToFront(originalPosition);
notifyDataSetChanged();
}
@Override
public View getDropDownView(int position, View convertView, @NonNull ViewGroup parent) {
final View view = super.getDropDownView(position, convertView, parent);
if (position == 0) {
view.setBackgroundResource(R.drawable.popup_background_selected);
TextView tv = (TextView) view;
tv.setTextColor(getContext().getColor(R.color.black));
}
return view;
}
}
}
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