Provide dragged Grid items in server side (#8950)

Fixes #8931

2 files changed, 51 insertions, 1 deletions

diff --git a/shared/src/main/java/com/vaadin/shared/ui/dnd/DragSourceRpc.java b/shared/src/main/java/com/vaadin/shared/ui/dnd/DragSourceRpc.java
index 4faf7ca139..1f016d5908 100644
--- a/shared/src/main/java/com/vaadin/shared/ui/dnd/DragSourceRpc.java
+++ b/shared/src/main/java/com/vaadin/shared/ui/dnd/DragSourceRpc.java
@@ -27,7 +27,7 @@ import com.vaadin.shared.communication.ServerRpc;
 public interface DragSourceRpc extends ServerRpc {
 
     /**
-     * Called when dragsource event happens on client side.
+     * Called when dragstart event happens on client side.
      */
     public void dragStart();
 
diff --git a/shared/src/main/java/com/vaadin/shared/ui/grid/GridDragSourceExtensionRpc.java b/shared/src/main/java/com/vaadin/shared/ui/grid/GridDragSourceExtensionRpc.java
new file mode 100644
index 0000000000..c0e24fe847
--- /dev/null
+++ b/shared/src/main/java/com/vaadin/shared/ui/grid/GridDragSourceExtensionRpc.java
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2000-2016 Vaadin Ltd.
+ *
+ * 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 com.vaadin.shared.ui.grid;
+
+import java.util.List;
+
+import com.vaadin.shared.communication.ServerRpc;
+import com.vaadin.shared.ui.dnd.DropEffect;
+
+/**
+ * RPC for firing server side drag start and drag end events when the
+ * corresponding client side events happen on the drag source Grid.
+ *
+ * @author Vaadin Ltd.
+ * @since
+ */
+public interface GridDragSourceExtensionRpc extends ServerRpc {
+
+    /**
+     * Called when dragstart event happens on client side.
+     *
+     * @param draggedItemKeys
+     *         Keys of the items in Grid being dragged.
+     */
+    public void dragStart(List<String> draggedItemKeys);
+
+    /**
+     * Called when dragend event happens on client side.
+     *
+     * @param dropEffect
+     *         Drop effect of the dragend event, extracted from {@code
+     *         DataTransfer.dropEffect} parameter.
+     * @param draggedItemKeys
+     *         Keys of the items in Grid having been dragged.
+     */
+    public void dragEnd(DropEffect dropEffect, List<String> draggedItemKeys);
+}