1 /*
2  * Copyright (C) 2022 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 
17 package com.android.settings.dream;
18 
19 import android.content.Context;
20 
21 import androidx.recyclerview.widget.GridLayoutManager;
22 import androidx.recyclerview.widget.RecyclerView;
23 
24 import com.android.settings.R;
25 
26 /** Grid layout manager that calculates the number of columns for the screen size. */
27 public final class AutoFitGridLayoutManager extends GridLayoutManager {
28     private final float mColumnWidth;
29 
AutoFitGridLayoutManager(Context context)30     public AutoFitGridLayoutManager(Context context) {
31         super(context, /* spanCount= */ 1);
32         this.mColumnWidth = context
33                 .getResources()
34                 .getDimensionPixelSize(R.dimen.dream_item_min_column_width);
35     }
36 
37     @Override
onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state)38     public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) {
39         final int totalSpace = getWidth() - getPaddingRight() - getPaddingLeft();
40         final int spanCount = Math.max(1, (int) (totalSpace / mColumnWidth));
41         setSpanCount(spanCount);
42         super.onLayoutChildren(recycler, state);
43     }
44 }
45