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Vaadin is a web application framework for Rich Internet Applications (RIA). Vaadin enables easy development and maintenance of fast and secure rich web applications with a stunning look and feel and a wide browser support. It features a server-side architecture with the majority of the logic running on the server. Ajax technology is used at the browser-side to ensure a rich and interactive user experience.

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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.client.data;

/**
 * Callback interface used by {@link DataSource} to inform its user about
 * updates to the data.
 *
 * @since 7.4
 * @author Vaadin Ltd
 */
public interface DataChangeHandler {
    /**
     * Called when the contents of the data source has changed. If the number of
     * rows has changed or if rows have been moved around,
     * {@link #dataAdded(int, int)} or {@link #dataRemoved(int, int)} should
     * ideally be used instead.
     *
     * @param firstRowIndex
     *            the index of the first changed row
     * @param numberOfRows
     *            the number of changed rows
     */
    public void dataUpdated(int firstRowIndex, int numberOfRows);

    /**
     * Called when rows have been removed from the data source.
     *
     * @param firstRowIndex
     *            the index that the first removed row had prior to removal
     * @param numberOfRows
     *            the number of removed rows
     */
    public void dataRemoved(int firstRowIndex, int numberOfRows);

    /**
     * Called when the new rows have been added to the container.
     *
     * @param firstRowIndex
     *            the index of the first added row
     * @param numberOfRows
     *            the number of added rows
     */
    public void dataAdded(int firstRowIndex, int numberOfRows);

    /**
     * Called when rows requested with
     * {@link DataSource#ensureAvailability(int, int)} rows are available.
     *
     * @param firstRowIndex
     *            the index of the first available row
     * @param numberOfRows
     *            the number of available rows
     */
    public void dataAvailable(int firstRowIndex, int numberOfRows);

    /**
     * Resets all data and defines a new size for the data.
     * 
     * This should be used in the cases where the data has changed in some
     * unverifiable way. I.e. "something happened". This will lead to a
     * re-rendering of the current Grid viewport
     *
     * @param estimatedNewDataSize
     *            the estimated size of the new data set
     */
    public void resetDataAndSize(int estimatedNewDataSize);
}