Java tutorial
/* * Copyright 2000-2018 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.renderers; import com.vaadin.client.widget.escalator.Cell; import com.vaadin.client.widget.grid.RendererCellReference; import com.vaadin.client.widgets.Grid; /** * Renderer for rending a value <T> into cell. * <p> * You can add a renderer to any column by overring the * {@link GridColumn#getRenderer()} method and returning your own renderer. You * can retrieve the cell element using {@link Cell#getElement()}. * * @param <T> * The column type * * @since 7.4 * @author Vaadin Ltd */ public interface Renderer<T> { /** * Called whenever the {@link Grid} updates a cell. * <p> * For optimal performance, work done in this method should be kept to a * minimum since it will be called continuously while the user is scrolling. * It is recommended to set up the cell's DOM structure in * {@link ComplexRenderer#init(RendererCellReference)} and only make * incremental updates based on cell data in this method. * * @param cell * The cell. Note that the cell is a flyweight and should not be * stored outside of the method as it will change. * * @param data * The column data object */ void render(RendererCellReference cell, T data); }