Java tutorial
/* * Copyright (c) 2012 Brown Bag Consulting. * This file is part of the ExpressUI project. * Author: Juan Osuna * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License Version 3 * as published by the Free Software Foundation with the addition of the * following permission added to Section 15 as permitted in Section 7(a): * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY * Brown Bag Consulting, Brown Bag Consulting DISCLAIMS THE WARRANTY OF * NON INFRINGEMENT OF THIRD PARTY RIGHTS. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. * * The interactive user interfaces in modified source and object code versions * of this program must display Appropriate Legal Notices, as required under * Section 5 of the GNU Affero General Public License. * * You can be released from the requirements of the license by purchasing * a commercial license. Buying such a license is mandatory as soon as you * develop commercial activities involving the ExpressUI software without * disclosing the source code of your own applications. These activities * include: offering paid services to customers as an ASP, providing * services from a web application, shipping ExpressUI with a closed * source product. * * For more information, please contact Brown Bag Consulting at this * address: juan@brownbagconsulting.com. */ package com.expressui.core.view.form.layout; import com.expressui.core.util.StringUtil; import com.expressui.core.view.field.FormField; import com.vaadin.ui.Alignment; import com.vaadin.ui.Field; import com.vaadin.ui.HorizontalLayout; import com.vaadin.ui.Label; /** * Form grid layout where labels are placed to the left of fields. */ public class LeftLabelGridLayout extends FormGridLayout { /** * Constructs layout with given number of columns and rows, from ExpressUI perspective. * * @param columns number of columns * @param rows number of rows */ public LeftLabelGridLayout(int columns, int rows) { super(columns * 3, rows); } @Override public void setFormColumns(int columns) { setColumns(columns * 3); } /** * Gets the column coordinate of the label for the given field. * * @param formField field to find label coordinate * @return label coordinate */ private int getLabelColumn(FormField formField) { return (formField.getColumnStart() - 1) * 3; } private int getFieldColumn(FormField formField) { return getLabelColumn(formField) + 1; } /** * Gets the column coordinate of spacer for the given field. * * @param formField field to find spacer coordinate * @return spacer coordinate */ private int getSpacerColumn(FormField formField) { if (formField.getColumnEnd() == null) { return getFieldColumn(formField) + 1; } else { return getColumnEnd(formField) + 1; } } /** * Gets the column end coordinate for given field. * * @param formField field to find column end coordinate * @return column end coordinate */ private Integer getColumnEnd(FormField formField) { if (formField.getColumnEnd() == null) { return null; } else { int diff = formField.getColumnEnd() - formField.getColumnStart(); return getFieldColumn(formField) + diff * 3; } } /** * Gets the start row coordinate of given field. * * @param formField field to find start row coordinate * @return start row coordinate */ private int getRowStart(FormField formField) { return formField.getRowStart() - 1; } /** * Gets the end row coordinate of given field. * * @param formField field to find end row coordinate * @return end row coordinate */ private int getRowEnd(FormField formField) { return formField.getRowEnd() - 1; } @Override public void addField(FormField formField) { HorizontalLayout fieldLayout = (HorizontalLayout) getComponent(getFieldColumn(formField), getRowStart(formField)); if (fieldLayout == null) { addFieldImpl(formField); } else { if (formField.getFieldLabel().getValue() != null) { Label label = formField.getFieldLabel(); fieldLayout.addComponent(label); Label spacer = new Label(); spacer.setWidth("1em"); fieldLayout.addComponent(spacer); } Field field = formField.getField(); fieldLayout.addComponent(field); Label spacer = new Label(); spacer.setWidth("1em"); fieldLayout.addComponent(spacer); } } private void addFieldImpl(FormField formField) { Label label = formField.getFieldLabel(); HorizontalLayout fieldLayout = new HorizontalLayout(); String id = StringUtil.generateDebugId("e", this, fieldLayout, "fieldLayout"); fieldLayout.setDebugId(id); fieldLayout.setSizeUndefined(); Field field = formField.getField(); fieldLayout.addComponent(field); Label spacer = new Label(); spacer.setWidth("1em"); if (formField.getColumnEnd() != null && formField.getRowEnd() != null) { addComponent(label, getLabelColumn(formField), getRowStart(formField), getLabelColumn(formField), getRowEnd(formField)); addComponent(fieldLayout, getFieldColumn(formField), getRowStart(formField), getColumnEnd(formField), getRowEnd(formField)); addComponent(spacer, getSpacerColumn(formField), getRowStart(formField), getSpacerColumn(formField), getRowEnd(formField)); } else { addComponent(label, getLabelColumn(formField), getRowStart(formField)); addComponent(fieldLayout, getFieldColumn(formField), getRowStart(formField)); addComponent(spacer, getSpacerColumn(formField), getRowStart(formField)); } setComponentAlignment(fieldLayout, Alignment.TOP_LEFT); setComponentAlignment(label, Alignment.TOP_RIGHT); setComponentAlignment(spacer, Alignment.TOP_LEFT); } @Override public void removeField(FormField formField) { removeComponent(getLabelColumn(formField), getRowStart(formField)); removeComponent(getFieldColumn(formField), getRowStart(formField)); removeComponent(getSpacerColumn(formField), getRowStart(formField)); } }