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/*
* 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.GridDropTargetExtensionRpc;
import com.vaadin.shared.ui.grid.GridDropTargetExtensionState;
/**
* 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 GridDropTargetExtension<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 GridDropTargetExtension(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(
(GridDropTargetExtensionRpc) (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 GridDropTargetExtensionState getState() {
return (GridDropTargetExtensionState) super.getState();
}
@Override
protected GridDropTargetExtensionState getState(boolean markAsDirty) {
return (GridDropTargetExtensionState) super.getState(markAsDirty);
}
}
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