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/*
* Copyright (C) 2017 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.settings.widget;
import android.content.Context;
import android.text.TextUtils;
/**
* Helper class that listens to settings changes and notifies client when there is update in
* corresponding summary info.
*/
public abstract class SummaryUpdater {
protected final Context mContext;
private final OnSummaryChangeListener mListener;
private String mSummary;
/**
* Interface definition for a callback to be invoked when the summary has been changed.
*/
public interface OnSummaryChangeListener {
/**
* Called when summary has changed.
*
* @param summary The new summary .
*/
void onSummaryChanged(String summary);
}
/**
* Constructor
*
* @param context The Context the updater is running in, through which it can register broadcast
* receiver etc.
* @param listener The listener that would like to receive summary change notification.
*
*/
public SummaryUpdater(Context context, OnSummaryChangeListener listener) {
mContext = context;
mListener = listener;
}
/**
* Notifies the listener when there is update in summary
*/
protected void notifyChangeIfNeeded() {
String summary = getSummary();
if (!TextUtils.equals(mSummary, summary)) {
mSummary = summary;
if (mListener != null) {
mListener.onSummaryChanged(summary);
}
}
}
/**
* Starts/stops receiving updates on the summary.
*
* @param register true if we want to receive updates, false otherwise
*/
public abstract void register(boolean register);
/**
* Gets the summary. Subclass should checks latest conditions and update the summary
* accordingly.
*
* @return the latest summary text
*/
protected abstract String getSummary();
}
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