1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License
15 */
16
17package com.google.android.leanbackjank.presenter;
18
19import android.content.Context;
20import android.graphics.drawable.Drawable;
21import android.view.LayoutInflater;
22import android.view.View;
23import android.view.ViewGroup;
24import android.widget.ImageView;
25import android.widget.TextView;
26
27import androidx.core.content.res.ResourcesCompat;
28import androidx.leanback.widget.HeaderItem;
29import androidx.leanback.widget.ListRow;
30import androidx.leanback.widget.Presenter;
31import androidx.leanback.widget.RowHeaderPresenter;
32
33import com.google.android.leanbackjank.R;
34
35public class HeaderItemPresenter extends RowHeaderPresenter {
36    private float mUnselectedAlpha;
37
38    @Override
39    public ViewHolder onCreateViewHolder(ViewGroup viewGroup) {
40        mUnselectedAlpha = viewGroup.getResources()
41                .getFraction(R.fraction.lb_browse_header_unselect_alpha, 1, 1);
42        LayoutInflater inflater = (LayoutInflater) viewGroup.getContext()
43                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
44
45        View view = inflater.inflate(R.layout.header_item, null);
46        view.setAlpha(mUnselectedAlpha); // Initialize icons to be at half-opacity.
47
48        return new ViewHolder(view);
49    }
50
51    @Override
52    public void onBindViewHolder(Presenter.ViewHolder viewHolder, Object item) {
53        HeaderItem headerItem = ((ListRow) item).getHeaderItem();
54        View rootView = viewHolder.view;
55        rootView.setFocusable(true);
56
57        ImageView iconView = (ImageView) rootView.findViewById(R.id.header_icon);
58        Drawable icon = ResourcesCompat.getDrawable(
59                rootView.getResources(), R.drawable.android_header, null);
60        iconView.setImageDrawable(icon);
61
62        TextView label = (TextView) rootView.findViewById(R.id.header_label);
63        label.setText(headerItem.getName());
64    }
65
66    @Override
67    public void onUnbindViewHolder(Presenter.ViewHolder viewHolder) {
68        // no op
69    }
70
71    // TODO: This is a temporary fix. Remove me when leanback onCreateViewHolder no longer sets the
72    // mUnselectAlpha, and also assumes the xml inflation will return a RowHeaderView.
73    @Override
74    protected void onSelectLevelChanged(RowHeaderPresenter.ViewHolder holder) {
75        holder.view.setAlpha(
76                mUnselectedAlpha + holder.getSelectLevel() * (1.0f - mUnselectedAlpha));
77    }
78}
79