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_CmsLayoutBundle; import org.opencms.gwt.client.ui.input.CmsCheckBox; import org.opencms.gwt.client.util.CmsDomUtil; 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.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.SimplePanel; /** * Provides a standard HTML form check box widget, for use on a widget dialog.<p> * * */ public class CmsCheckboxWidget extends Composite implements I_CmsEditWidget { /** The check box of this widget. */ protected CmsCheckBox m_checkbox = new CmsCheckBox(); /** The token to control activation. */ private boolean m_active = true; /** * Constructs an OptionalTextBox with the given caption on the check.<p> */ public CmsCheckboxWidget() { SimplePanel panel = new SimplePanel(); // adds the checkbox to the panel. panel.add(m_checkbox); // Set the check box's caption, and check it by default. m_checkbox.setChecked(true); m_checkbox.addValueChangeHandler(new ValueChangeHandler<Boolean>() { public void onValueChange(ValueChangeEvent<Boolean> event) { if (Boolean.parseBoolean(m_checkbox.getFormValueAsString())) { getParent().getElement().addClassName(I_CmsLayoutBundle.INSTANCE.form().inActive()); } else { getParent().getElement().removeClassName(I_CmsLayoutBundle.INSTANCE.form().inActive()); } fireChangeEvent(); } }); m_checkbox.getButton().addFocusHandler(new FocusHandler() { public void onFocus(FocusEvent event) { CmsDomUtil.fireFocusEvent(CmsCheckboxWidget.this); } }); // All composites must call initWidget() in their constructors. initWidget(panel); } /** * @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_checkbox.getFormValueAsString()); } /** * @see com.google.gwt.user.client.ui.HasValue#getValue() */ public String getValue() { return m_checkbox.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) { // fix button bar positioning issue Element parent = CmsDomUtil.getAncestor(getElement(), I_CmsLayoutBundle.INSTANCE.form().attributeValue()); if (parent != null) { parent.addClassName(I_CmsLayoutBundle.INSTANCE.form().shallowWidget()); } // control if the value has not change do nothing. if (m_active == active) { return; } // set the new value. m_active = active; // fire change event. if (active) { fireChangeEvent(); } // activate the checkbox. m_checkbox.setEnabled(active); } /** * @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) { m_checkbox.setFormValueAsString(value); } /** * @see com.google.gwt.user.client.ui.HasValue#setValue(java.lang.Object, boolean) */ public void setValue(String value, boolean fireEvents) { if (Boolean.parseBoolean(value)) { getParent().getElement().addClassName(I_CmsLayoutBundle.INSTANCE.form().inActive()); } else { getParent().getElement().removeClassName(I_CmsLayoutBundle.INSTANCE.form().inActive()); } m_checkbox.setFormValueAsString(value); if (fireEvents) { fireChangeEvent(); } } }