1 files changed, 41 insertions, 0 deletions
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/util/recyclerview/ItemTouchHelperAdapter.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/util/recyclerview/ItemTouchHelperAdapter.java
new file mode 100644
index 000000000..c691182bf
--- /dev/null
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/util/recyclerview/ItemTouchHelperAdapter.java
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2015 Paul Burke
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.sufficientlysecure.keychain.ui.util.recyclerview;
+
+import android.support.v7.widget.RecyclerView;
+import android.support.v7.widget.helper.ItemTouchHelper;
+
+/**
+ * Interface to listen for a move or dismissal event from a {@link ItemTouchHelper.Callback}.
+ */
+public interface ItemTouchHelperAdapter {
+
+    /**
+     * Called when an item has been dragged far enough to trigger a move. This is called every time
+     * an item is shifted, and <strong>not</strong> at the end of a "drop" event.<br/>
+     * <br/>
+     * Implementations should call {@link RecyclerView.Adapter#notifyItemMoved(int, int)} after
+     * adjusting the underlying data to reflect this move.
+     *
+     * @param fromPosition The start position of the moved item.
+     * @param toPosition   Then resolved position of the moved item.
+     * @see RecyclerView#getAdapterPositionFor(RecyclerView.ViewHolder)
+     * @see RecyclerView.ViewHolder#getAdapterPosition()
+     */
+    void onItemMove(RecyclerView.ViewHolder source, RecyclerView.ViewHolder target,
+                    int fromPosition, int toPosition);
+}