48 lines
1.7 KiB
Kotlin
48 lines
1.7 KiB
Kotlin
/* Copyright 2022 Tusky Contributors
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*
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* This file is a part of Tusky.
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*
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* This program is free software; you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation; either version 3 of the
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* License, or (at your option) any later version.
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*
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* Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
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* the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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* Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with Tusky; if not,
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* see <http://www.gnu.org/licenses>. */
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package com.keylesspalace.tusky.components.account.media
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import android.graphics.Rect
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import android.view.View
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import androidx.recyclerview.widget.RecyclerView
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import androidx.recyclerview.widget.RecyclerView.ItemDecoration
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class GridSpacingItemDecoration(
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private val spanCount: Int,
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private val spacing: Int,
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private val topOffset: Int
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) : ItemDecoration() {
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override fun getItemOffsets(
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outRect: Rect,
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view: View,
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parent: RecyclerView,
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state: RecyclerView.State
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) {
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val position = parent.getChildAdapterPosition(view) // item position
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if (position < topOffset) return
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val column = (position - topOffset) % spanCount // item column
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outRect.left = column * spacing / spanCount // column * ((1f / spanCount) * spacing)
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outRect.right =
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spacing - (column + 1) * spacing / spanCount // spacing - (column + 1) * ((1f / spanCount) * spacing)
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if (position - topOffset >= spanCount) {
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outRect.top = spacing // item top
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}
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}
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}
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