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/*
* Copyright (C) 2021 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.settingslib.widget;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.AdapterView;
import androidx.preference.Preference;
import androidx.preference.Preference.OnPreferenceClickListener;
import androidx.preference.PreferenceViewHolder;
import com.android.settingslib.widget.settingsspinner.SettingsSpinner;
import com.android.settingslib.widget.settingsspinner.SettingsSpinnerAdapter;
/**
* This preference uses SettingsSpinner & SettingsSpinnerAdapter which provide default layouts for
* both view and drop down view of the Spinner.
*/
public class SettingsSpinnerPreference extends Preference implements OnPreferenceClickListener {
private SettingsSpinnerAdapter mAdapter;
private AdapterView.OnItemSelectedListener mListener;
private int mPosition;
private boolean mShouldPerformClick;
/**
* Perform inflation from XML and apply a class-specific base style.
*
* @param context The {@link Context} this is associated with, through which it can
* access the current theme, resources, {@link SharedPreferences}, etc.
* @param attrs The attributes of the XML tag that is inflating the preference
* @param defStyle An attribute in the current theme that contains a reference to a style
* resource that supplies default values for the view. Can be 0 to not
* look for defaults.
*/
public SettingsSpinnerPreference(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
setLayoutResource(R.layout.settings_spinner_preference);
setOnPreferenceClickListener(this);
}
/**
* Perform inflation from XML and apply a class-specific base style.
*
* @param context The {@link Context} this is associated with, through which it can
* access the current theme, resources, {@link SharedPreferences}, etc.
* @param attrs The attributes of the XML tag that is inflating the preference
*/
public SettingsSpinnerPreference(Context context, AttributeSet attrs) {
super(context, attrs);
setLayoutResource(R.layout.settings_spinner_preference);
setOnPreferenceClickListener(this);
}
/**
* Constructor to create a preference.
*
* @param context The Context this is associated with.
*/
public SettingsSpinnerPreference(Context context) {
this(context, null);
}
@Override
public boolean onPreferenceClick(Preference preference) {
mShouldPerformClick = true;
notifyChanged();
return true;
}
/** Sets adapter of the spinner. */
public <T extends SettingsSpinnerAdapter> void setAdapter(T adapter) {
mAdapter = adapter;
notifyChanged();
}
/** Sets item selection listener of the spinner. */
public void setOnItemSelectedListener(AdapterView.OnItemSelectedListener listener) {
mListener = listener;
}
/** Gets selected item of the spinner. */
public Object getSelectedItem() {
return mAdapter == null ? null : mAdapter.getItem(mPosition);
}
/** Gets selection position of the spinner */
public void setSelection(int position) {
if (mPosition == position) {
return;
}
mPosition = position;
notifyChanged();
}
@Override
public void onBindViewHolder(PreferenceViewHolder holder) {
super.onBindViewHolder(holder);
final SettingsSpinner spinner = (SettingsSpinner) holder.findViewById(R.id.spinner);
spinner.setAdapter(mAdapter);
spinner.setSelection(mPosition);
spinner.setOnItemSelectedListener(mOnSelectedListener);
if (mShouldPerformClick) {
mShouldPerformClick = false;
// To show dropdown view.
spinner.performClick();
}
}
private final AdapterView.OnItemSelectedListener mOnSelectedListener =
new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
if (mPosition == position) return;
mPosition = position;
if (mListener != null) {
mListener.onItemSelected(parent, view, position, id);
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
if (mListener != null) {
mListener.onNothingSelected(parent);
}
}
};
}
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