#453 Move to using a RecyclerView for directories

1 files changed, 99 insertions, 0 deletions

diff --git a/app/src/main/java/github/daneren2005/dsub/view/GridSpacingDecoration.java b/app/src/main/java/github/daneren2005/dsub/view/GridSpacingDecoration.java
new file mode 100644
index 00000000..3bb3e8a1
--- /dev/null
+++ b/app/src/main/java/github/daneren2005/dsub/view/GridSpacingDecoration.java
@@ -0,0 +1,99 @@
+/*
+  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 {
+
+	@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, 10, view.getResources().getDisplayMetrics());
+		int halfSpacing = spacing / 2;
+
+		int childCount = parent.getChildCount();
+		int childIndex = parent.getChildPosition(view);
+		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;
+	}
+}