Fix DragAndDropWrapper update after file upload (#19616)

After a file has been uploaded VDragAndDropWrapper tries to pull changes
from the server by calling
ApplicationConnection.sendPendingVariableChanges() which has no effect.

This change replaces the
ApplicationConnection.sendPendingVariableChanges() call with an RPC.

Change-Id: Ibdf7f4d702add9507dbe54c1fdb402f0f4b19d19

1 files changed, 36 insertions, 0 deletions

diff --git a/shared/src/com/vaadin/shared/ui/draganddropwrapper/DragAndDropWrapperServerRpc.java b/shared/src/com/vaadin/shared/ui/draganddropwrapper/DragAndDropWrapperServerRpc.java
new file mode 100644
index 0000000000..d5100aba3f
--- /dev/null
+++ b/shared/src/com/vaadin/shared/ui/draganddropwrapper/DragAndDropWrapperServerRpc.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2000-2014 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.draganddropwrapper;
+
+import com.vaadin.shared.communication.ServerRpc;
+
+/**
+ * RPC interface for calls from client to server.
+ * 
+ * @since
+ * @author Vaadin Ltd
+ */
+public interface DragAndDropWrapperServerRpc extends ServerRpc {
+
+    /**
+     * Called to poll the server to see if any changes have been made e.g. when
+     * the upload is complete.
+     * 
+     * @since
+     */
+    public void poll();
+
+}