Java tutorial
/* * This library is part of OpenCms - * the Open Source Content Management System * * Copyright (c) Alkacon Software GmbH & Co. KG (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.acacia.client.widgets; import org.opencms.acacia.client.css.I_CmsWidgetsLayoutBundle; import org.opencms.gwt.client.ui.input.CmsComboBox; import org.opencms.gwt.client.util.CmsDomUtil; import java.util.Map.Entry; import com.google.gwt.dom.client.Element; import com.google.gwt.event.dom.client.FocusEvent; import com.google.gwt.event.dom.client.FocusHandler; import com.google.gwt.event.dom.client.KeyUpEvent; import com.google.gwt.event.dom.client.KeyUpHandler; 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; /** * A combo box widget.<p> * * Regarding widget configuration, see <code>{@link org.opencms.acacia.client.widgets.CmsSelectConfigurationParser}</code>.<p> */ public class CmsComboWidget extends Composite implements I_CmsEditWidget { /** Value of the activation. */ private boolean m_active = true; /** The combo box. */ private CmsComboBox m_comboBox = new CmsComboBox(); /** String to control new key press. */ private String m_oldtext = ""; /** * Constructs an CmsComboWidget with the in XSD schema declared configuration.<p> * * @param config The configuration string given from OpenCms XSD. */ public CmsComboWidget(String config) { parseConfiguration(config); m_comboBox.addStyleName(I_CmsWidgetsLayoutBundle.INSTANCE.widgetCss().selectBoxPanel()); // add some styles to parts of the combobox. m_comboBox.getOpener().addStyleName(I_CmsWidgetsLayoutBundle.INSTANCE.widgetCss().selectBoxSelected()); m_comboBox.getSelectorPopup().addStyleName(I_CmsWidgetsLayoutBundle.INSTANCE.widgetCss().selectBoxPopup()); m_comboBox.getTextBox().addStyleName(I_CmsWidgetsLayoutBundle.INSTANCE.widgetCss().comboBoxInput()); m_comboBox.getTextBox().addKeyUpHandler(new KeyUpHandler() { public void onKeyUp(KeyUpEvent arg0) { onkeyupevent(); } }); m_comboBox.addValueChangeHandler(new ValueChangeHandler<String>() { public void onValueChange(ValueChangeEvent<String> event) { fireChangeEvent(); } }); initWidget(m_comboBox); m_comboBox.getTextBox().addFocusHandler(new FocusHandler() { public void onFocus(FocusEvent event) { CmsDomUtil.fireFocusEvent(CmsComboWidget.this); } }); } /** * @see com.google.gwt.event.dom.client.HasFocusHandlers#addFocusHandler(com.google.gwt.event.dom.client.FocusHandler) */ public HandlerRegistration addFocusHandler(FocusHandler handler) { return addDomHandler(handler, FocusEvent.getType()); } /** * @see com.google.gwt.event.logical.shared.HasValueChangeHandlers#addValueChangeHandler(com.google.gwt.event.logical.shared.ValueChangeHandler) */ public HandlerRegistration addValueChangeHandler(ValueChangeHandler<String> handler) { return addHandler(handler, ValueChangeEvent.getType()); } /** * Represents a value change event.<p> * */ public void fireChangeEvent() { ValueChangeEvent.fire(this, m_comboBox.getFormValueAsString()); } /** * @see com.google.gwt.user.client.ui.HasValue#getValue() */ public String getValue() { return m_comboBox.getFormValueAsString(); } /** * @see org.opencms.acacia.client.widgets.I_CmsEditWidget#isActive() */ public boolean isActive() { return m_active; } /** * @see org.opencms.acacia.client.widgets.I_CmsEditWidget#onAttachWidget() */ public void onAttachWidget() { super.onAttach(); } /** * @see org.opencms.acacia.client.widgets.I_CmsEditWidget#owns(com.google.gwt.dom.client.Element) */ public boolean owns(Element element) { // TODO implement this in case we want the delete behavior for optional fields return false; } /** * @see org.opencms.acacia.client.widgets.I_CmsEditWidget#setActive(boolean) */ public void setActive(boolean active) { if (active == m_active) { return; } m_active = active; m_comboBox.setEnabled(active); if (active) { fireChangeEvent(); } } /** * @see org.opencms.acacia.client.widgets.I_CmsEditWidget#setName(java.lang.String) */ public void setName(String name) { // no input field so nothing to do } /** * @see com.google.gwt.user.client.ui.HasValue#setValue(java.lang.Object) */ public void setValue(String value) { setValue(value, false); } /** * @see com.google.gwt.user.client.ui.HasValue#setValue(java.lang.Object, boolean) */ public void setValue(String value, boolean fireEvents) { //m_selectBox.selectValue(value); m_comboBox.setFormValueAsString(value); if (fireEvents) { fireChangeEvent(); } } /** * Helper function to handle the popup of the combobox. <p> */ protected void onkeyupevent() { String newText = m_comboBox.getFormValueAsString(); if (!newText.equals(m_oldtext)) { fireChangeEvent(); if (!newText.equals("")) { m_comboBox.closeSelector(); } else { m_comboBox.openSelector(); } } m_oldtext = newText; } /** * Helper function for parsing the configuration of the combo-box.<p> * * @param config the configuration string. * */ private void parseConfiguration(String config) { CmsSelectConfigurationParser parser = new CmsSelectConfigurationParser(config); // set the help info first!! for (Entry<String, String> helpEntry : parser.getHelpTexts().entrySet()) { m_comboBox.setTitle(helpEntry.getKey(), helpEntry.getValue()); } //set value and option to the combo box. m_comboBox.setItems(parser.getOptions()); //if one entrance is declared for default. if (parser.getDefaultValue() != null) { //set the declared value selected. m_comboBox.selectValue(parser.getDefaultValue()); } fireChangeEvent(); } }