| /* |
| * Copyright (C) 2015 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 com.android.tv.guide; |
| |
| import android.content.Context; |
| import androidx.recyclerview.widget.LinearLayoutManager; |
| import androidx.recyclerview.widget.RecyclerView; |
| import android.util.AttributeSet; |
| import android.view.View; |
| |
| public class TimelineGridView extends RecyclerView { |
| public TimelineGridView(Context context) { |
| this(context, null); |
| } |
| |
| public TimelineGridView(Context context, AttributeSet attrs) { |
| this(context, attrs, 0); |
| } |
| |
| public TimelineGridView(Context context, AttributeSet attrs, int defStyle) { |
| super(context, attrs, defStyle); |
| |
| setLayoutManager( |
| new LinearLayoutManager(context, LinearLayoutManager.HORIZONTAL, false) { |
| @Override |
| public boolean onRequestChildFocus( |
| RecyclerView parent, State state, View child, View focused) { |
| // This disables the default scroll behavior for focus movement. |
| return true; |
| } |
| }); |
| |
| // RecyclerView is always focusable, however this is not desirable for us, so disable. |
| // See b/18863217 (ag/634046) for reasons to why RecyclerView is focusable. |
| setFocusable(false); |
| |
| // Don't cache anything that is off screen. Normally it is good to prefetch and prepopulate |
| // off screen views in order to reduce jank, however the program guide is capable to scroll |
| // in all four directions so not only would we prefetch views in the scrolling direction |
| // but also keep views in the perpendicular direction up to date. |
| // E.g. when scrolling horizontally we would have to update rows above and below the current |
| // view port even though they are not visible. |
| setItemViewCacheSize(0); |
| } |
| } |