/*
* Copyright 2011 Google Inc.
*
* 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.google.gwt.examples.view;
import com.google.gwt.cell.client.TextCell;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.cellview.client.CellList;
import com.google.gwt.user.cellview.client.SimplePager;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.view.client.Range;
import com.google.gwt.view.client.RangeChangeEvent;
import java.util.ArrayList;
import java.util.List;
/**
* Example of using a {@link RangeChangeEvent.Handler} to push data into a
* {@link CellList} when the range changes.
*/
public class RangeChangeHandlerExample implements EntryPoint {
@Override
public void onModuleLoad() {
// Create a CellList.
final CellList<String> cellList = new CellList<String>(new TextCell());
// Add a range change handler.
cellList.addRangeChangeHandler(new RangeChangeEvent.Handler() {
@Override
public void onRangeChange(RangeChangeEvent event) {
Range range = event.getNewRange();
int start = range.getStart();
int length = range.getLength();
// Create the data to push into the view. At this point, you could send
// an asynchronous RPC request to a server.
List<String> data = new ArrayList<String>();
for (int i = start; i < start + length; i++) {
data.add("Item " + i);
}
// Push the data into the list.
cellList.setRowData(start, data);
}
});
// Force the cellList to fire an initial range change event.
cellList.setVisibleRangeAndClearData(new Range(0, 25), true);
// Create paging controls.
SimplePager pager = new SimplePager();
pager.setDisplay(cellList);
// Add the widgets to the root panel.
VerticalPanel vPanel = new VerticalPanel();
vPanel.add(pager);
vPanel.add(cellList);
RootPanel.get().add(vPanel);
}
}