Java tutorial
/* * This library is part of OpenCms - * the Open Source Content Management System * * Copyright (c) Alkacon Software GmbH (http://www.alkacon.com) * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * For further information about Alkacon Software, please see the * company website: http://www.alkacon.com * * For further information about OpenCms, please see the * project website: http://www.opencms.org * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ package org.opencms.ade.galleries.client.preview.ui; import org.opencms.ade.galleries.client.ui.css.I_CmsLayoutBundle; import org.opencms.gwt.client.ui.input.CmsLabel; import org.opencms.gwt.client.ui.input.CmsTextBox; import com.google.gwt.core.client.Scheduler; import com.google.gwt.core.client.Scheduler.ScheduledCommand; import com.google.gwt.dom.client.Style.Unit; import com.google.gwt.event.dom.client.KeyPressEvent; import com.google.gwt.event.dom.client.KeyPressHandler; import com.google.gwt.event.logical.shared.HasValueChangeHandlers; import com.google.gwt.event.logical.shared.ValueChangeEvent; import com.google.gwt.event.logical.shared.ValueChangeHandler; import com.google.gwt.event.shared.HandlerRegistration; import com.google.gwt.user.client.ui.Composite; import com.google.gwt.user.client.ui.FlowPanel; /** * The widget to display a simple form with a label and an text box.<p> * * @since 8.0. */ public class CmsPropertyForm extends Composite implements HasValueChangeHandlers<String> { /** The flag to indicate if the text box value is changed. */ protected boolean m_isChanged; /** The original value. */ protected String m_originalValue; /** The text box. */ protected CmsTextBox m_textBox; /** The id of the property. */ private String m_id; /** The text box panel. */ private FlowPanel m_inputPanel; /** The label. */ private CmsLabel m_label; /** The parent panel. */ private FlowPanel m_parent; /** The width of the parent panel. */ private int m_parentWidth; /** * The constructor.<p> * * @param id the id of the property from * @param width the property from width * @param value the property value * @param textMetricsKey the key identifying the text metrics to use */ public CmsPropertyForm(String id, int width, String value, String textMetricsKey) { m_id = id; m_originalValue = value; m_isChanged = false; m_parentWidth = width; m_parent = new FlowPanel(); m_parent.getElement().getStyle().setWidth(m_parentWidth, Unit.PX); // set form label m_label = new CmsLabel(m_id); m_label.addStyleName(I_CmsLayoutBundle.INSTANCE.previewDialogCss().labelField()); m_label.getElement().getStyle().setWidth(getLabelWidth(), Unit.PX); m_label.truncate(textMetricsKey, getLabelWidth()); m_parent.add(m_label); // set form text box m_inputPanel = new FlowPanel(); m_inputPanel.getElement().getStyle().setWidth(getInputWidth(), Unit.PX); m_inputPanel.addStyleName(I_CmsLayoutBundle.INSTANCE.previewDialogCss().inputField()); m_textBox = new CmsTextBox(); m_textBox.setFormValueAsString(m_originalValue); m_textBox.addValueChangeHandler(new ValueChangeHandler<String>() { /** * @see com.google.gwt.event.logical.shared.ValueChangeHandler#onValueChange(ValueChangeEvent event) */ public void onValueChange(ValueChangeEvent<String> event) { m_isChanged = true; m_textBox.setChangedStyle(); } }); m_textBox.addKeyPressHandler(new KeyPressHandler() { public void onKeyPress(KeyPressEvent event) { // make sure the value change event is fired on the first change inside the text box if (!isChanged()) { Scheduler.get().scheduleDeferred(new ScheduledCommand() { public void execute() { if (!isChanged()) { if (((getValue() == null) && (m_originalValue != null)) || (!getValue().equals(m_originalValue))) { ValueChangeEvent.fire(m_textBox, getValue()); } } } }); } } }); m_inputPanel.add(m_textBox); m_parent.add(m_inputPanel); initWidget(m_parent); } /** * @see com.google.gwt.event.logical.shared.HasValueChangeHandlers#addValueChangeHandler(com.google.gwt.event.logical.shared.ValueChangeHandler) */ public HandlerRegistration addValueChangeHandler(ValueChangeHandler<String> handler) { return m_textBox.addValueChangeHandler(handler); } /** * Returns the id of the property.<p> * * @return the id */ public String getId() { return m_id; } /** * Returns the field value.<p> * * @return the field value */ public String getValue() { return m_textBox.getFormValueAsString(); } /** * Returns the isChanged.<p> * * @return the isChanged */ public boolean isChanged() { return m_isChanged; } /** * Sets the style of the parent panel.<p> * * @param style the css class */ public void setFormStyle(String style) { m_parent.addStyleName(style); } /** * The width of the text box.<p> * * @return the width */ private int getInputWidth() { return (m_parentWidth / 3) * 2; } /** * The width of the label.<p> * * @return the label width */ private int getLabelWidth() { // 2px: margin-left return (m_parentWidth / 3) - 2; } }