132 lines
4.8 KiB
Java
132 lines
4.8 KiB
Java
/*
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This file is part of Subsonic.
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Subsonic 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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Subsonic 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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You should have received a copy of the GNU General Public License
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along with Subsonic. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2015 (C) Scott Jackson
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*/
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package net.nullsum.audinaut.view;
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import android.graphics.Rect;
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import android.util.TypedValue;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.FrameLayout;
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import android.widget.LinearLayout;
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import androidx.recyclerview.widget.GridLayoutManager;
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import androidx.recyclerview.widget.RecyclerView;
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public class GridSpacingDecoration extends RecyclerView.ItemDecoration {
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public static final int SPACING = 10;
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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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super.getItemOffsets(outRect, view, parent, state);
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int spacing = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, SPACING, view.getResources().getDisplayMetrics());
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int halfSpacing = spacing / 2;
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int childCount = parent.getChildCount();
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int childIndex = parent.getChildAdapterPosition(view);
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// Not an actual child (ie: during delete event)
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if (childIndex == -1) {
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return;
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}
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int spanCount = getTotalSpan(parent);
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int spanIndex = childIndex % spanCount;
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// If we can, use the SpanSizeLookup since headers screw up the index calculation
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RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
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if (layoutManager instanceof GridLayoutManager) {
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GridLayoutManager gridLayoutManager = (GridLayoutManager) layoutManager;
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GridLayoutManager.SpanSizeLookup spanSizeLookup = gridLayoutManager.getSpanSizeLookup();
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if (spanSizeLookup != null) {
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spanIndex = spanSizeLookup.getSpanIndex(childIndex, spanCount);
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}
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}
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int spanSize = getSpanSize(parent, childIndex);
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/* INVALID SPAN */
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if (spanCount < 1 || spanSize > 1) return;
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int margins = 0;
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if (view instanceof UpdateView) {
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View firstChild = ((ViewGroup) view).getChildAt(0);
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ViewGroup.LayoutParams layoutParams = firstChild.getLayoutParams();
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if (layoutParams instanceof LinearLayout.LayoutParams) {
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margins = ((LinearLayout.LayoutParams) layoutParams).bottomMargin;
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} else if (layoutParams instanceof FrameLayout.LayoutParams) {
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margins = ((FrameLayout.LayoutParams) layoutParams).bottomMargin;
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}
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}
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int doubleMargins = margins * 2;
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outRect.top = halfSpacing - margins;
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outRect.bottom = halfSpacing - margins;
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outRect.left = halfSpacing - margins;
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outRect.right = halfSpacing - margins;
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if (isTopEdge(childIndex, spanIndex, spanCount)) {
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outRect.top = spacing - doubleMargins;
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}
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if (isLeftEdge(spanIndex)) {
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outRect.left = spacing - doubleMargins;
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}
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if (isRightEdge(spanIndex, spanCount)) {
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outRect.right = spacing - doubleMargins;
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}
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if (isBottomEdge(childIndex, childCount, spanCount)) {
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outRect.bottom = spacing - doubleMargins;
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}
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}
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private int getTotalSpan(RecyclerView parent) {
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RecyclerView.LayoutManager mgr = parent.getLayoutManager();
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if (mgr instanceof GridLayoutManager) {
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return ((GridLayoutManager) mgr).getSpanCount();
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}
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return -1;
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}
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private int getSpanSize(RecyclerView parent, int childIndex) {
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RecyclerView.LayoutManager mgr = parent.getLayoutManager();
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if (mgr instanceof GridLayoutManager) {
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GridLayoutManager.SpanSizeLookup lookup = ((GridLayoutManager) mgr).getSpanSizeLookup();
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if (lookup != null) {
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return lookup.getSpanSize(childIndex);
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}
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}
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return 1;
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}
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private boolean isLeftEdge(int spanIndex) {
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return spanIndex == 0;
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}
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private boolean isRightEdge(int spanIndex, int spanCount) {
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return spanIndex == spanCount - 1;
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}
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private boolean isTopEdge(int childIndex, int spanIndex, int spanCount) {
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return childIndex < spanCount && childIndex == spanIndex;
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}
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private boolean isBottomEdge(int childIndex, int childCount, int spanCount) {
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return childIndex >= childCount - spanCount;
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}
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}
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