Jon Miranda | 16ea1b1 | 2017-12-12 14:52:48 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2017 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 | package com.android.wallpaper.widget; |
| 17 | |
| 18 | import android.graphics.Rect; |
Jon Miranda | 16ea1b1 | 2017-12-12 14:52:48 -0800 | [diff] [blame] | 19 | import android.util.Log; |
| 20 | import android.view.View; |
| 21 | |
Sunny Goyal | 8600a3f | 2018-08-15 12:48:01 -0700 | [diff] [blame^] | 22 | import androidx.recyclerview.widget.RecyclerView; |
| 23 | import androidx.recyclerview.widget.RecyclerView.ItemDecoration; |
| 24 | |
Jon Miranda | 16ea1b1 | 2017-12-12 14:52:48 -0800 | [diff] [blame] | 25 | /** |
| 26 | * Decorates a grid view item with margins on each side. Note that this pads on the bottom and |
| 27 | * right, so the containing RecyclerView should add {@code paddingTop} and {@code paddingLeft} to |
| 28 | * make things look even. |
| 29 | */ |
| 30 | public class GridMarginDecoration extends ItemDecoration { |
| 31 | private static final String TAG = "GridMarginDecoration"; |
| 32 | private int horizontalMargin; |
| 33 | private int verticalMargin; |
| 34 | |
| 35 | public GridMarginDecoration(int horizontalMargin, int verticalMargin) { |
| 36 | this.horizontalMargin = horizontalMargin; |
| 37 | this.verticalMargin = verticalMargin; |
| 38 | } |
| 39 | |
| 40 | /** |
| 41 | * Applies a GridMarginDecoration to the specified recyclerView, calculating the horizontal and |
| 42 | * vertical margin based on the view's {@code paddingLeft} and {@code paddingTop}. |
| 43 | */ |
| 44 | public static void applyTo(RecyclerView recyclerView) { |
| 45 | int horizontal = recyclerView.getPaddingLeft(); |
| 46 | int vertical = recyclerView.getPaddingTop(); |
| 47 | if (recyclerView.getPaddingRight() != 0 || recyclerView.getPaddingBottom() != 0) { |
| 48 | Log.d(TAG, "WARNING: the view being decorated has right and/or bottom padding, which will " |
| 49 | + "make the post-decoration grid unevenly padded"); |
| 50 | } |
| 51 | |
| 52 | recyclerView.addItemDecoration(new GridMarginDecoration(horizontal, vertical)); |
| 53 | } |
| 54 | |
| 55 | @Override |
| 56 | public void getItemOffsets(Rect outRect, View view, RecyclerView parent, |
| 57 | RecyclerView.State state) { |
| 58 | outRect.set(0, 0, horizontalMargin, verticalMargin); |
| 59 | } |
| 60 | } |