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/*
* Copyright 2018 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.car.media.common;
import android.graphics.Rect;
import android.view.View;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
/**
* An {@link RecyclerView.ItemDecoration} that adds spacing between cells in a
* {@link GridLayoutManager}.
*/
public class GridSpacingItemDecoration extends RecyclerView.ItemDecoration {
private final int mSpacing;
/**
* Creates a {@link GridSpacingItemDecoration}.
*
* @param spacing space to add between grid cells horizontally.
*/
public GridSpacingItemDecoration(int spacing) {
this.mSpacing = spacing;
}
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent,
RecyclerView.State state) {
GridLayoutManager.LayoutParams lp = (GridLayoutManager.LayoutParams) view.getLayoutParams();
GridLayoutManager layoutManager = (GridLayoutManager) parent.getLayoutManager();
int column = lp.getSpanIndex();
int spanCount = layoutManager.getSpanCount();
outRect.left = column * mSpacing / spanCount;
outRect.right = mSpacing - (column + 1) * mSpacing / spanCount;
}
}