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Add an adapter for binding an ObservableList to a LinearLayout

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EditTexts do not work in ListViews.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Samuel Holland 2017-08-22 21:49:55 -05:00
parent fb919a7226
commit 353028420b
5 changed files with 169 additions and 14 deletions
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41
app/src/main/java/com/wireguard/android/BindingAdapters.java
View File

@ -1,10 +1,11 @@
package com.wireguard.android;
import android.databinding.BindingAdapter;
import android.databinding.ObservableArrayMap;
import android.databinding.ObservableList;
import android.databinding.adapters.ListenerUtil;
import android.graphics.Typeface;
import android.text.InputFilter;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
@ -15,11 +16,34 @@ import android.widget.TextView;
@SuppressWarnings("unused")
public final class BindingAdapters {
@BindingAdapter({"items", "layout"})
public static <T> void listBinding(final ListView view,
public static <T> void setItems(final LinearLayout view,
final ObservableList<T> oldList, final int oldLayoutId,
final ObservableList<T> newList, final int newLayoutId) {
// Remove any existing binding when there is no new list.
if (newList == null) {
if (oldList == newList && oldLayoutId == newLayoutId)
return;
ItemChangeListener<T> listener = ListenerUtil.getListener(view, R.id.item_change_listener);
// If the layout changes, any existing listener must be replaced.
if (listener != null && oldList != null && oldLayoutId != newLayoutId) {
listener.setList(null);
listener = null;
}
// Avoid adding a listener when there is no new list or layout.
if (newList == null || newLayoutId == 0)
return;
if (listener == null) {
listener = new ItemChangeListener<>(view, newLayoutId);
ListenerUtil.trackListener(view, listener, R.id.item_change_listener);
}
// Either the list changed, or this is an entirely new listener because the layout changed.
listener.setList(newList);
}
@BindingAdapter({"items", "layout"})
public static <T> void setItems(final ListView view,
final ObservableList<T> oldList, final int oldLayoutId,
final ObservableList<T> newList, final int newLayoutId) {
// Remove any existing binding when there is no new list or layout.
if (newList == null || newLayoutId == 0) {
view.setAdapter(null);
return;
}
@ -39,11 +63,12 @@ public final class BindingAdapters {
}
@BindingAdapter({"items", "layout"})
public static <K extends Comparable<K>, V> void sortedMapBinding(
final ListView view, final ObservableSortedMap<K, V> oldMap, final int oldLayoutId,
public static <K extends Comparable<K>, V> void setItems(
final ListView view,
final ObservableSortedMap<K, V> oldMap, final int oldLayoutId,
final ObservableSortedMap<K, V> newMap, final int newLayoutId) {
// Remove any existing binding when there is no new map.
if (newMap == null) {
// Remove any existing binding when there is no new map or layout.
if (newMap == null || newLayoutId == 0) {
view.setAdapter(null);
return;
}

126
app/src/main/java/com/wireguard/android/ItemChangeListener.java Normal file
View File

@ -0,0 +1,126 @@
package com.wireguard.android;
import android.databinding.DataBindingUtil;
import android.databinding.ObservableList;
import android.databinding.ViewDataBinding;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import java.lang.ref.WeakReference;
/**
* Helper class for binding an ObservableList to the children of a ViewGroup.
*/
class ItemChangeListener<T> {
private final OnListChangedCallback<T> callback = new OnListChangedCallback<>(this);
private final ViewGroup container;
private final int layoutId;
private final LayoutInflater layoutInflater;
private ObservableList<T> list;
ItemChangeListener(final ViewGroup container, final int layoutId) {
this.container = container;
this.layoutId = layoutId;
layoutInflater = LayoutInflater.from(container.getContext());
}
private View getView(final int position, final View convertView) {
ViewDataBinding binding = DataBindingUtil.getBinding(convertView);
if (binding == null)
binding = DataBindingUtil.inflate(layoutInflater, layoutId, container, false);
binding.setVariable(BR.item, list.get(position));
binding.executePendingBindings();
return binding.getRoot();
}
public void setList(final ObservableList<T> newList) {
if (list != null)
list.removeOnListChangedCallback(callback);
list = newList;
if (list != null) {
list.addOnListChangedCallback(callback);
callback.onChanged(list);
} else {
container.removeAllViews();
}
}
private static class OnListChangedCallback<T>
extends ObservableList.OnListChangedCallback<ObservableList<T>> {
private final WeakReference<ItemChangeListener<T>> weakListener;
private OnListChangedCallback(final ItemChangeListener<T> listener) {
weakListener = new WeakReference<>(listener);
}
@Override
public void onChanged(final ObservableList<T> sender) {
final ItemChangeListener<T> listener = weakListener.get();
if (listener != null) {
// TODO: recycle views
listener.container.removeAllViews();
for (int i = 0; i < sender.size(); ++i)
listener.container.addView(listener.getView(i, null));
} else {
sender.removeOnListChangedCallback(this);
}
}
@Override
public void onItemRangeChanged(final ObservableList<T> sender, final int positionStart,
final int itemCount) {
final ItemChangeListener<T> listener = weakListener.get();
if (listener != null) {
for (int i = positionStart; i < positionStart + itemCount; ++i) {
final View child = listener.container.getChildAt(i);
listener.container.removeViewAt(i);
listener.container.addView(listener.getView(i, child));
}
} else {
sender.removeOnListChangedCallback(this);
}
}
@Override
public void onItemRangeInserted(final ObservableList<T> sender, final int positionStart,
final int itemCount) {
final ItemChangeListener<T> listener = weakListener.get();
if (listener != null) {
for (int i = positionStart; i < positionStart + itemCount; ++i)
listener.container.addView(listener.getView(i, null));
} else {
sender.removeOnListChangedCallback(this);
}
}
@Override
public void onItemRangeMoved(final ObservableList<T> sender, final int fromPosition,
final int toPosition, final int itemCount) {
final ItemChangeListener<T> listener = weakListener.get();
if (listener != null) {
final View[] views = new View[itemCount];
for (int i = 0; i < itemCount; ++i)
views[i] = listener.container.getChildAt(fromPosition + i);
listener.container.removeViews(fromPosition, itemCount);
for (int i = 0; i < itemCount; ++i)
listener.container.addView(views[i], toPosition + i);
} else {
sender.removeOnListChangedCallback(this);
}
}
@Override
public void onItemRangeRemoved(final ObservableList<T> sender, final int positionStart,
final int itemCount) {
final ItemChangeListener<T> listener = weakListener.get();
if (listener != null) {
listener.container.removeViews(positionStart, itemCount);
} else {
sender.removeOnListChangedCallback(this);
}
}
}
}

4
app/src/main/java/com/wireguard/android/ObservableListAdapter.java
View File

@ -17,14 +17,14 @@ import java.lang.ref.WeakReference;
*/
class ObservableListAdapter<T> extends BaseAdapter implements ListAdapter {
private final OnListChangedCallback<T> callback = new OnListChangedCallback<>(this);
private final int layoutId;
private final LayoutInflater layoutInflater;
private ObservableList<T> list;
private final OnListChangedCallback<T> callback = new OnListChangedCallback<>(this);
ObservableListAdapter(final Context context, final int layoutId, final ObservableList<T> list) {
layoutInflater = LayoutInflater.from(context);
this.layoutId = layoutId;
layoutInflater = LayoutInflater.from(context);
setList(list);
}

4
app/src/main/java/com/wireguard/android/ObservableMapAdapter.java
View File

@ -19,16 +19,16 @@ import java.util.Collections;
*/
class ObservableMapAdapter<K extends Comparable<K>, V> extends BaseAdapter implements ListAdapter {
private final OnMapChangedCallback<K, V> callback = new OnMapChangedCallback<>(this);
private ArrayList<K> keys;
private final int layoutId;
private final LayoutInflater layoutInflater;
private ObservableSortedMap<K, V> map;
private final OnMapChangedCallback<K, V> callback = new OnMapChangedCallback<>(this);
ObservableMapAdapter(final Context context, final int layoutId,
final ObservableSortedMap<K, V> map) {
layoutInflater = LayoutInflater.from(context);
this.layoutId = layoutId;
layoutInflater = LayoutInflater.from(context);
setMap(map);
}

4
app/src/main/res/values/ids.xml Normal file
View File

@ -0,0 +1,4 @@
<?xml version="1.0" encoding="utf-8"?>
<resources>
<item name="item_change_listener" type="id" />
</resources>