DrawerItemViewHolder.java
/*
* 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 androidx.car.drawer;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.VisibleForTesting;
import androidx.car.R;
import androidx.car.util.CarUxRestrictionsUtils;
import androidx.car.uxrestrictions.CarUxRestrictions;
import androidx.car.uxrestrictions.OnUxRestrictionsChangedListener;
import androidx.recyclerview.widget.RecyclerView;
/**
* Re-usable {@link RecyclerView.ViewHolder} for displaying items in the
* {@link androidx.car.drawer.CarDrawerAdapter}.
*/
public class DrawerItemViewHolder extends RecyclerView.ViewHolder implements
OnUxRestrictionsChangedListener {
private final ImageView mIcon;
private final TextView mTitle;
private final TextView mBody;
private final ImageView mEndIcon;
/**
* Create a new {@code ViewHolder} that will parse the given view that is meant to displaying
* items in a drawer.
*
* <p>The given view is required to have a title and icon view with an optional body and end
* icon view. These views are looked up via ids, specifically:
*
* <ul>
* <li>Icon - R.id.icon
* <li>Title - R.id.title
* <li>Body - R.id.body
* <li>End Icon - R.id.end_icon
* </ul>
*
* <p>This method is exposed for testing purposes. The {@code DrawerItemViewHolder} is
* automatically created by the {@link CarDrawerAdapter}.
*
* @param view The view that will represent an item in a drawer.
*/
@VisibleForTesting(otherwise = VisibleForTesting.PACKAGE_PRIVATE)
public DrawerItemViewHolder(@NonNull View view) {
super(view);
mIcon = view.findViewById(R.id.icon);
if (mIcon == null) {
throw new IllegalArgumentException("Icon view cannot be null!");
}
mTitle = view.findViewById(R.id.title);
if (mTitle == null) {
throw new IllegalArgumentException("Title view cannot be null!");
}
// Next two are optional and may be null.
mBody = view.findViewById(R.id.body);
mEndIcon = view.findViewById(R.id.end_icon);
}
/** Returns the view that should be used to display the main icon. */
@NonNull
public ImageView getIconView() {
return mIcon;
}
/** Returns the view that will display the main title. */
@NonNull
public TextView getTitleView() {
return mTitle;
}
/**
* Returns the view that is used for the body text that is smaller than the title text and
* appears beneath the title.
*/
@Nullable
public TextView getBodyView() {
return mBody;
}
/** Returns the icon that is displayed at the end of the view. */
@Nullable
public ImageView getEndIconView() {
return mEndIcon;
}
/**
* Updates child views with current car UX restrictions.
*
* <p>{@code Text} might be truncated to meet length limit required by regulation.
*
* @param restrictionsInfo current car UX restrictions.
*/
@Override
public void onUxRestrictionsChanged(CarUxRestrictions restrictionsInfo) {
CarUxRestrictionsUtils.apply(itemView.getContext(), restrictionsInfo, getBodyView());
}
}