From a3276a448528cee3ed392bf01e36835bbe8246ee Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dominik=20Sch=C3=BCrmann?= <dominik@dominikschuermann.de>
Date: Mon, 30 Mar 2015 20:41:29 +0200
Subject: Use RecyclerView in EncryptFilesFragment

---
 .../keychain/ui/adapter/SpacesItemDecoration.java  | 93 ++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/adapter/SpacesItemDecoration.java

(limited to 'OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/adapter/SpacesItemDecoration.java')

diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/adapter/SpacesItemDecoration.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/adapter/SpacesItemDecoration.java
new file mode 100644
index 000000000..bc595803b
--- /dev/null
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/adapter/SpacesItemDecoration.java
@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2015 Dominik Schürmann <dominik@dominikschuermann.de>
+ *
+ * This program 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.
+ *
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.sufficientlysecure.keychain.ui.adapter;
+
+import android.graphics.Rect;
+import android.support.v7.widget.GridLayoutManager;
+import android.support.v7.widget.RecyclerView;
+import android.view.View;
+
+/**
+ * https://gist.github.com/yrom/3b4bcbc2370ca2290434
+ */
+public class SpacesItemDecoration extends RecyclerView.ItemDecoration {
+    private int space;
+    private int spanCount;
+    private int lastItemInFirstLane = -1;
+
+    public SpacesItemDecoration(int space) {
+        this(space, 1);
+    }
+
+    /**
+     * @param space
+     * @param spanCount spans count of one lane
+     */
+    public SpacesItemDecoration(int space, int spanCount) {
+        this.space = space;
+        this.spanCount = spanCount;
+    }
+
+    @Override
+    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
+        RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) view.getLayoutParams();
+        final int position = params.getViewPosition();
+        final int spanSize;
+        final int index;
+        if (params instanceof GridLayoutManager.LayoutParams) {
+            GridLayoutManager.LayoutParams gridParams = (GridLayoutManager.LayoutParams) params;
+            spanSize = gridParams.getSpanSize();
+            index = gridParams.getSpanIndex();
+        } else {
+            spanSize = 1;
+            index = position % spanCount;
+        }
+        // invalid value
+        if (spanSize < 1 || index < 0) return;
+
+        if (spanSize == spanCount) { // full span
+            outRect.left = space;
+            outRect.right = space;
+        } else {
+            if (index == 0) { // left one
+                outRect.left = space;
+            }
+            // spanCount >= 1
+            if (index == spanCount - 1) { // right one
+                outRect.right = space;
+            }
+            if (outRect.left == 0) {
+                outRect.left = space / 2;
+            }
+            if (outRect.right == 0) {
+                outRect.right = space / 2;
+            }
+        }
+        // set top to all in first lane
+        if (position < spanCount && spanSize <= spanCount) {
+            if (lastItemInFirstLane < 0) { // lay out at first time
+                lastItemInFirstLane = position + spanSize == spanCount ? position : lastItemInFirstLane;
+                outRect.top = space;
+            } else if (position <= lastItemInFirstLane) { // scroll to first lane again
+                outRect.top = space;
+            }
+        }
+        outRect.bottom = space;
+
+    }
+} 
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