93 lines
3.2 KiB
Java
93 lines
3.2 KiB
Java
/*
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* Copyright (C) 2017 Schürmann & Breitmoser GbR
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General 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
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.sufficientlysecure.keychain.ui.adapter;
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import android.graphics.Rect;
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import android.support.v7.widget.GridLayoutManager;
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import android.support.v7.widget.RecyclerView;
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import android.view.View;
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/**
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* https://gist.github.com/yrom/3b4bcbc2370ca2290434
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*/
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public class SpacesItemDecoration extends RecyclerView.ItemDecoration {
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private int space;
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private int spanCount;
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private int lastItemInFirstLane = -1;
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public SpacesItemDecoration(int space) {
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this(space, 1);
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}
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/**
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* @param space
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* @param spanCount spans count of one lane
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*/
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public SpacesItemDecoration(int space, int spanCount) {
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this.space = space;
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this.spanCount = spanCount;
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}
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@Override
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public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
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RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) view.getLayoutParams();
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final int position = params.getViewPosition();
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final int spanSize;
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final int index;
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if (params instanceof GridLayoutManager.LayoutParams) {
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GridLayoutManager.LayoutParams gridParams = (GridLayoutManager.LayoutParams) params;
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spanSize = gridParams.getSpanSize();
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index = gridParams.getSpanIndex();
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} else {
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spanSize = 1;
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index = position % spanCount;
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}
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// invalid value
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if (spanSize < 1 || index < 0) return;
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if (spanSize == spanCount) { // full span
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outRect.left = space;
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outRect.right = space;
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} else {
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if (index == 0) { // left one
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outRect.left = space;
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}
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// spanCount >= 1
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if (index == spanCount - 1) { // right one
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outRect.right = space;
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}
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if (outRect.left == 0) {
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outRect.left = space / 2;
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}
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if (outRect.right == 0) {
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outRect.right = space / 2;
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}
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}
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// set top to all in first lane
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if (position < spanCount && spanSize <= spanCount) {
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if (lastItemInFirstLane < 0) { // lay out at first time
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lastItemInFirstLane = position + spanSize == spanCount ? position : lastItemInFirstLane;
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outRect.top = space;
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} else if (position <= lastItemInFirstLane) { // scroll to first lane again
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outRect.top = space;
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}
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}
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outRect.bottom = space;
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}
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} |