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/*
This file is part of Subsonic.
Subsonic is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Subsonic is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Subsonic. If not, see <http://www.gnu.org/licenses/>.
Copyright 2015 (C) Scott Jackson
*/
package github.daneren2005.dsub.view;
import android.graphics.Rect;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.TypedValue;
import android.view.View;
public class GridSpacingDecoration extends RecyclerView.ItemDecoration {
public static final int SPACING = 10;
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
super.getItemOffsets(outRect, view, parent, state);
int spacing = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, SPACING, view.getResources().getDisplayMetrics());
int halfSpacing = spacing / 2;
int childCount = parent.getChildCount();
int childIndex = parent.getChildPosition(view);
// Not an actual child (ie: during delete event)
if(childIndex == -1) {
return;
}
int spanCount = getTotalSpan(view, parent);
int spanIndex = childIndex % spanCount;
int spanSize = getSpanSize(parent, childIndex);
/* INVALID SPAN */
if (spanCount < 1 || spanSize > 1) return;
outRect.top = halfSpacing;
outRect.bottom = halfSpacing;
outRect.left = halfSpacing;
outRect.right = halfSpacing;
if (isTopEdge(childIndex, spanCount)) {
outRect.top = spacing;
}
if (isLeftEdge(spanIndex, spanCount)) {
outRect.left = spacing;
}
if (isRightEdge(spanIndex, spanCount)) {
outRect.right = spacing;
}
if (isBottomEdge(childIndex, childCount, spanCount)) {
outRect.bottom = spacing;
}
}
protected int getTotalSpan(View view, RecyclerView parent) {
RecyclerView.LayoutManager mgr = parent.getLayoutManager();
if (mgr instanceof GridLayoutManager) {
return ((GridLayoutManager) mgr).getSpanCount();
}
return -1;
}
protected int getSpanSize(RecyclerView parent, int childIndex) {
RecyclerView.LayoutManager mgr = parent.getLayoutManager();
if (mgr instanceof GridLayoutManager) {
GridLayoutManager.SpanSizeLookup lookup = ((GridLayoutManager) mgr).getSpanSizeLookup();
if(lookup != null) {
return lookup.getSpanSize(childIndex);
}
}
return 1;
}
protected boolean isLeftEdge(int spanIndex, int spanCount) {
return spanIndex == 0;
}
protected boolean isRightEdge(int spanIndex, int spanCount) {
return spanIndex == spanCount - 1;
}
protected boolean isTopEdge(int childIndex, int spanCount) {
return childIndex < spanCount;
}
protected boolean isBottomEdge(int childIndex, int childCount, int spanCount) {
return childIndex >= childCount - spanCount;
}
}
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