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/*
* 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 android.support.v7.widget.LinearLayoutManager;
import android.support.v7.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);
}
}
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