Android Open Source - android-spinnerwheel Abstract Wheel Adapter

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License

The source code is released under:

Apache License

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Java Source Code

/*
 * android-spinnerwheel//  www .  j a v a2 s .co m
 * https://github.com/ai212983/android-spinnerwheel
 *
 * based on
 *
 * Android Wheel Control.
 * https://code.google.com/p/android-wheel/
 *
 * Copyright 2011 Yuri Kanivets
 *
 * 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 antistatic.spinnerwheel.adapters;

import java.util.LinkedList;
import java.util.List;

import android.database.DataSetObserver;
import android.view.View;
import android.view.ViewGroup;

/**
 * Abstract Wheel adapter.
 */
public abstract class AbstractWheelAdapter implements WheelViewAdapter {
    // Observers
    private List<DataSetObserver> datasetObservers;
    
    @Override
    public View getEmptyItem(View convertView, ViewGroup parent) {
        return null;
    }

    @Override
    public void registerDataSetObserver(DataSetObserver observer) {
        if (datasetObservers == null) {
            datasetObservers = new LinkedList<DataSetObserver>();
        }
        datasetObservers.add(observer);
    }

    @Override
    public void unregisterDataSetObserver(DataSetObserver observer) {
        if (datasetObservers != null) {
            datasetObservers.remove(observer);
        }
    }
    
    /**
     * Notifies observers about data changing
     */
    protected void notifyDataChangedEvent() {
        if (datasetObservers != null) {
            for (DataSetObserver observer : datasetObservers) {
                observer.onChanged();
            }
        }
    }
    
    /**
     * Notifies observers about invalidating data
     */
    protected void notifyDataInvalidatedEvent() {
        if (datasetObservers != null) {
            for (DataSetObserver observer : datasetObservers) {
                observer.onInvalidated();
            }
        }
    }
}

Java Source Code List