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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.
/*
* 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.widget.escalator;
import com.google.gwt.event.shared.GwtEvent;
import com.vaadin.shared.Range;
/**
* Event fired when the range of visible rows changes e.g. because of scrolling.
*
* @since 7.4
* @author Vaadin Ltd
*/
public class RowVisibilityChangeEvent
extends GwtEvent {
/**
* The type of this event.
*/
public static final Type TYPE = new Type<>();
private final Range visibleRows;
/**
* Creates a new row visibility change event
*
* @param firstVisibleRow
* the index of the first visible row
* @param visibleRowCount
* the number of visible rows
*/
public RowVisibilityChangeEvent(int firstVisibleRow, int visibleRowCount) {
visibleRows = Range.withLength(firstVisibleRow, visibleRowCount);
}
/**
* Gets the index of the first row that is at least partially visible.
*
* @return the index of the first visible row
*/
public int getFirstVisibleRow() {
return visibleRows.getStart();
}
/**
* Gets the number of at least partially visible rows.
*
* @return the number of visible rows
*/
public int getVisibleRowCount() {
return visibleRows.length();
}
/**
* Gets the range of visible rows.
*
* @since 7.6
* @return the visible rows
*/
public Range getVisibleRowRange() {
return visibleRows;
}
/*
* (non-Javadoc)
*
* @see com.google.gwt.event.shared.GwtEvent#getAssociatedType()
*/
@Override
public Type getAssociatedType() {
return TYPE;
}
/*
* (non-Javadoc)
*
* @see
* com.google.gwt.event.shared.GwtEvent#dispatch(com.google.gwt.event.shared
* .EventHandler)
*/
@Override
protected void dispatch(RowVisibilityChangeHandler handler) {
handler.onRowVisibilityChange(this);
}
}