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NestableListView.java
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NestableListView.java
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package com.tf.library.nestablelistview;
import android.content.Context;
import android.database.DataSetObserver;
import android.util.AttributeSet;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
import java.util.ArrayList;
import java.util.List;
/**
* Created by kamran on 10/22/16.
*/
public class NestableListView extends LinearLayout {
private final static String TAG = NestableListView.class.getSimpleName();
private Adapter mAdapter;
public NestableListView(Context context) {
this(context, null);
}
public NestableListView(Context context, AttributeSet attrs) {
super(context, attrs);
initialize();
}
private void initialize() {
setLayoutParams(new LinearLayout
.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT));
setOrientation(LinearLayout.VERTICAL);
}
public void setAdapter(Adapter adapter) {
this.mAdapter = adapter;
if(mAdapter != null) {
mAdapter.registerNestableDataSetObserver(dataSetObserver);
mAdapter.notifyDataSetChanged();
}
}
@Override
protected void onDetachedFromWindow() {
this.mAdapter = null;
super.onDetachedFromWindow();
}
private NestableDataSetObserver dataSetObserver = new NestableDataSetObserver() {
@Override
public void onAddition(int position) {
if (mAdapter != null && mAdapter.getCount() > getChildCount()) {
addView(mAdapter.getView(position, null, NestableListView.this), position);
}
}
@Override
public void onItemChanged(int position) {
removeViewAt(position);
if(mAdapter != null) {
addView(mAdapter.getView(position, null, NestableListView.this), position);
}
}
@Override
public void onChanged() {
super.onChanged();
int numberOfItems = (mAdapter == null )? 0 : mAdapter.getCount();
removeAllViewsInLayout();
for (int index = 0; mAdapter != null && index < numberOfItems; index++) {
addView(mAdapter.getView(index, null, NestableListView.this));
}
}
@Override
public void onInvalidated() {
super.onInvalidated();
}
};
public static abstract class Adapter<T> extends ArrayAdapter<T> {
private ArrayList<NestableDataSetObserver> mObservers= new ArrayList<>();
public Adapter(Context context, int resource) {
super(context, resource);
}
public Adapter(Context context, int resource, int textViewResourceId) {
super(context, resource, textViewResourceId);
}
public Adapter(Context context, int resource, T[] objects) {
super(context, resource, objects);
}
public Adapter(Context context, int resource, int textViewResourceId, T[] objects) {
super(context, resource, textViewResourceId, objects);
}
public Adapter(Context context, int resource, List<T> objects) {
super(context, resource, objects);
}
public Adapter(Context context, int resource, int textViewResourceId, List<T> objects) {
super(context, resource, textViewResourceId, objects);
}
@Override
public void notifyDataSetChanged() {
super.notifyDataSetChanged();
for (NestableDataSetObserver observer : mObservers) {
observer.onChanged();
}
}
public void notifyAddition(int position) {
for (NestableDataSetObserver observer : mObservers) {
observer.onAddition(position);
}
}
public void notifyItemChanged(int position) {
for (NestableDataSetObserver observer : mObservers) {
observer.onItemChanged(position);
}
}
public void registerNestableDataSetObserver(NestableDataSetObserver observer) {
this.mObservers.add(observer);
}
public void unregisterNestableDataSetObserver(NestableDataSetObserver observer) {
this.mObservers.remove(observer);
}
}
public static abstract class NestableDataSetObserver extends DataSetObserver {
public abstract void onAddition(int position);
public abstract void onItemChanged(int position);
}
}