1 files changed, 118 insertions, 0 deletions
diff --git a/server/src/main/java/com/vaadin/ui/GridDropTarget.java b/server/src/main/java/com/vaadin/ui/GridDropTarget.java
new file mode 100644
index 0000000000..0cd51d8634
--- /dev/null
+++ b/server/src/main/java/com/vaadin/ui/GridDropTarget.java
@@ -0,0 +1,118 @@
+/*
+ * 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.ui;
+
+import com.vaadin.event.dnd.DropTargetExtension;
+import com.vaadin.event.dnd.grid.GridDropEvent;
+import com.vaadin.event.dnd.grid.GridDropListener;
+import com.vaadin.shared.Registration;
+import com.vaadin.shared.ui.grid.DropMode;
+import com.vaadin.shared.ui.grid.GridDropTargetRpc;
+import com.vaadin.shared.ui.grid.GridDropTargetState;
+
+/**
+ * Makes the rows of a Grid HTML5 drop targets. This is the server side
+ * counterpart of GridDropTargetExtensionConnector.
+ *
+ * @param <T>
+ *         Type of the Grid bean.
+ * @author Vaadin Ltd
+ * @since
+ */
+public class GridDropTarget<T> extends DropTargetExtension<Grid<T>> {
+
+    /**
+     * Extends a Grid and makes it's rows drop targets for HTML5 drag and drop.
+     *
+     * @param target
+     *         Grid to be extended.
+     * @param dropMode
+     *         Drop mode that describes the allowed drop locations within the
+     *         Grid's row.
+     * @see GridDropEvent#getDropLocation()
+     */
+    public GridDropTarget(Grid<T> target, DropMode dropMode) {
+        super(target);
+
+        setDropMode(dropMode);
+    }
+
+    /**
+     * Sets the drop mode of this drop target.
+     *
+     * @param dropMode
+     *         Drop mode that describes the allowed drop locations within the
+     *         Grid's row.
+     * @see GridDropEvent#getDropLocation()
+     */
+    public void setDropMode(DropMode dropMode) {
+        if (dropMode == null) {
+            throw new IllegalArgumentException("Drop mode cannot be null");
+        }
+
+        getState().dropMode = dropMode;
+    }
+
+    /**
+     * Gets the drop mode of this drop target.
+     *
+     * @return Drop mode that describes the allowed drop locations within the
+     *         Grid's row.
+     */
+    public DropMode getDropMode() {
+        return getState(false).dropMode;
+    }
+
+    /**
+     * Attaches drop listener for the current drop target. {@link
+     * GridDropListener#drop(GridDropEvent)} is called when drop event happens
+     * on the client side.
+     *
+     * @param listener
+     *         Listener to handle drop event.
+     * @return Handle to be used to remove this listener.
+     */
+    public Registration addGridDropListener(GridDropListener<T> listener) {
+        return addListener(GridDropEvent.class, listener,
+                GridDropListener.DROP_METHOD);
+    }
+
+    @Override
+    protected void registerDropTargetRpc(Grid<T> target) {
+        registerRpc(
+                (GridDropTargetRpc) (dataTransferText, rowKey, dropLocation) -> {
+
+                    T dropTargetRow = target.getDataCommunicator()
+                            .getKeyMapper().get(rowKey);
+
+                    GridDropEvent<T> event = new GridDropEvent<>(target,
+                            dataTransferText, getUI().getActiveDragSource(),
+                            dropTargetRow, dropLocation);
+
+                    fireEvent(event);
+                });
+    }
+
+    @Override
+    protected GridDropTargetState getState() {
+        return (GridDropTargetState) super.getState();
+    }
+
+    @Override
+    protected GridDropTargetState getState(boolean markAsDirty) {
+        return (GridDropTargetState) super.getState(markAsDirty);
+    }
+}