AbstractDetailsDescriptionPresenter.java revision a83005b70853ea52c5d98910762344de16b850a8 
1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
5 * in compliance with the License. You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software distributed under the License
10 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
11 * or implied. See the License for the specific language governing permissions and limitations under
12 * the License.
13 */
14package android.support.v17.leanback.widget;
15
16import android.support.v17.leanback.R;
17import android.view.LayoutInflater;
18import android.view.View;
19import android.view.ViewGroup;
20import android.widget.TextView;
21
22/**
23 * An abstract {@link Presenter} for rendering a detailed description of an
24 * item. Typically this Presenter will be used in a DetailsOveriewRowPresenter.
25 *
26 * <p>Subclasses will override {@link #onBindDescription} to implement the data
27 * binding for this Presenter.
28 */
29public abstract class AbstractDetailsDescriptionPresenter extends Presenter {
30
31    public static class ViewHolder extends Presenter.ViewHolder {
32        private final TextView mTitle;
33        private final TextView mSubtitle;
34        private final TextView mBody;
35
36        public ViewHolder(View view) {
37            super(view);
38            mTitle = (TextView) view.findViewById(R.id.lb_details_description_title);
39            mSubtitle = (TextView) view.findViewById(R.id.lb_details_description_subtitle);
40            mBody = (TextView) view.findViewById(R.id.lb_details_description_body);
41        }
42
43        public TextView getTitle() {
44            return mTitle;
45        }
46
47        public TextView getSubtitle() {
48            return mSubtitle;
49        }
50
51        public TextView getBody() {
52            return mBody;
53        }
54    }
55
56    public final ViewHolder onCreateViewHolder(ViewGroup parent) {
57        View v = LayoutInflater.from(parent.getContext())
58            .inflate(R.layout.lb_details_description, parent, false);
59        return new ViewHolder(v);
60    }
61
62    public final void onBindViewHolder(Presenter.ViewHolder viewHolder, Object item) {
63        ViewHolder vh = (ViewHolder) viewHolder;
64        DetailsOverviewRow row = (DetailsOverviewRow) item;
65        onBindDescription(vh, row);
66    }
67
68    /**
69     * Binds the data from the DetailsOverviewRow to the ViewHolder. The item
70     * being described in this row is accessible via the row's {@link
71     * DetailsOverviewRow#getItem getItem} method.
72     *
73     * @param vh The ViewHolder for this details description view.
74     * @param row The DetailsOverviewRow being presented.
75     */
76    protected abstract void onBindDescription(ViewHolder vh, DetailsOverviewRow row);
77
78    public void onUnbindViewHolder(Presenter.ViewHolder viewHolder) {}
79}
80