Java tutorial
/* * Copyright 2009 IT Mill 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 org.generationcp.samplevaadin7widget; import java.util.Map; import org.generationcp.samplevaadin7widget.gwt.client.ui.VColorPicker; import com.vaadin.terminal.PaintException; import com.vaadin.terminal.PaintTarget; import com.vaadin.ui.AbstractField; import com.vaadin.ui.ClientWidget; @SuppressWarnings("serial") @ClientWidget(VColorPicker.class) public class ColorPicker extends AbstractField { public ColorPicker() { super(); setValue(new String("white")); } /** The property value of the field is a String. */ @Override public Class<?> getType() { return String.class; } /** Set the currently selected color. */ public void setColor(String newcolor) { // Sets the color name as the property of the component. // Setting the property will automatically cause repainting of // the component with paintContent(). setValue(newcolor); } /** Retrieve the currently selected color. */ public String getColor() { return (String) getValue(); } /** Paint (serialize) the component for the client. */ @Override public void paintContent(PaintTarget target) throws PaintException { // Superclass writes any common attributes in the paint target. super.paintContent(target); // Add the currently selected color as a variable in the paint // target. target.addVariable(this, "colorname", getColor()); } /** Deserialize changes received from client. */ @SuppressWarnings("unchecked") @Override public void changeVariables(Object source, Map variables) { // Sets the currently selected color if (variables.containsKey("colorname") && !isReadOnly()) { final String newValue = (String) variables.get("colorname"); // Changing the property of the component will // trigger a ValueChangeEvent setValue(newValue, true); } } }