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 package com.android.systemui.util.recycler
17 
18 import android.graphics.Rect
19 import android.view.View
20 import androidx.annotation.Dimension
21 import androidx.recyclerview.widget.RecyclerView
22 
23 /**
24  * RecyclerView ItemDecorator that adds a horizontal space of the given size between items
25  * and double that space on the ends.
26  */
27 class HorizontalSpacerItemDecoration(@Dimension private val offset: Int) :
28     RecyclerView.ItemDecoration() {
29 
getItemOffsetsnull30     override fun getItemOffsets(
31         outRect: Rect,
32         view: View,
33         parent: RecyclerView,
34         state: RecyclerView.State
35     ) {
36         val position: Int = parent.getChildAdapterPosition(view)
37         val itemCount = parent.adapter?.itemCount ?: 0
38 
39         val left = if (position == 0) offset * 2 else offset
40         val right = if (position == itemCount - 1) offset * 2 else offset
41 
42         outRect.set(left, 0, right, 0)
43     }
44 }
45