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.support.v17.leanback.widget.HeaderItem;
22import android.support.v17.leanback.widget.ListRow;
23import android.support.v17.leanback.widget.Presenter;
24import android.support.v17.leanback.widget.RowHeaderPresenter;
25import android.support.v4.content.res.ResourcesCompat;
26import android.view.LayoutInflater;
27import android.view.View;
28import android.view.ViewGroup;
29import android.widget.ImageView;
30import android.widget.TextView;
31
32import com.google.android.leanbackjank.R;
33
34public class HeaderItemPresenter extends RowHeaderPresenter {
35    private float mUnselectedAlpha;
36
37    @Override
38    public ViewHolder onCreateViewHolder(ViewGroup viewGroup) {
39        mUnselectedAlpha = viewGroup.getResources()
40                .getFraction(R.fraction.lb_browse_header_unselect_alpha, 1, 1);
41        LayoutInflater inflater = (LayoutInflater) viewGroup.getContext()
42                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
43
44        View view = inflater.inflate(R.layout.header_item, null);
45        view.setAlpha(mUnselectedAlpha); // Initialize icons to be at half-opacity.
46
47        return new ViewHolder(view);
48    }
49
50    @Override
51    public void onBindViewHolder(Presenter.ViewHolder viewHolder, Object item) {
52        HeaderItem headerItem = ((ListRow) item).getHeaderItem();
53        View rootView = viewHolder.view;
54        rootView.setFocusable(true);
55
56        ImageView iconView = (ImageView) rootView.findViewById(R.id.header_icon);
57        Drawable icon = ResourcesCompat.getDrawable(
58                rootView.getResources(), R.drawable.android_header, null);
59        iconView.setImageDrawable(icon);
60
61        TextView label = (TextView) rootView.findViewById(R.id.header_label);
62        label.setText(headerItem.getName());
63    }
64
65    @Override
66    public void onUnbindViewHolder(Presenter.ViewHolder viewHolder) {
67        // no op
68    }
69
70    // TODO: This is a temporary fix. Remove me when leanback onCreateViewHolder no longer sets the
71    // mUnselectAlpha, and also assumes the xml inflation will return a RowHeaderView.
72    @Override
73    protected void onSelectLevelChanged(RowHeaderPresenter.ViewHolder holder) {
74        holder.view.setAlpha(
75                mUnselectedAlpha + holder.getSelectLevel() * (1.0f - mUnselectedAlpha));
76    }
77}
78