Java tutorial
/* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you 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.apache.myfaces.custom.toggle; import java.io.IOException; import java.util.Iterator; import java.util.List; import java.util.Map; import javax.faces.component.UIComponent; import javax.faces.component.UIOutput; import javax.faces.component.behavior.ClientBehavior; import javax.faces.context.FacesContext; import javax.faces.context.ResponseWriter; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.myfaces.component.UserRoleUtils; import org.apache.myfaces.renderkit.html.ext.HtmlLinkRenderer; import org.apache.myfaces.shared_tomahawk.renderkit.ClientBehaviorEvents; import org.apache.myfaces.shared_tomahawk.renderkit.RendererUtils; import org.apache.myfaces.shared_tomahawk.renderkit.html.HTML; import org.apache.myfaces.shared_tomahawk.renderkit.html.HtmlRendererUtils; /** * Renderer for component HtmlAjaxChildComboBox * * * @JSFRenderer * renderKitId = "HTML_BASIC" * family = "javax.faces.Output" * type = "org.apache.myfaces.ToggleLink" * * @author Sharath Reddy */ public class ToggleLinkRenderer extends HtmlLinkRenderer { public static final int DEFAULT_MAX_SUGGESTED_ITEMS = 200; protected void renderOutputLinkStart(FacesContext facesContext, UIOutput output) throws IOException { ResponseWriter writer = facesContext.getResponseWriter(); String clientId = output.getClientId(facesContext); ToggleLink toggleLink = (ToggleLink) output; //write anchor writer.startElement(HTML.ANCHOR_ELEM, output); writer.writeAttribute(HTML.ID_ATTR, clientId, null); writer.writeAttribute(HTML.NAME_ATTR, clientId, null); writer.writeURIAttribute(HTML.HREF_ATTR, "javascript:void(0);", null); Map<String, List<ClientBehavior>> behaviors = toggleLink.getClientBehaviors(); if (behaviors != null && !behaviors.isEmpty()) { HtmlRendererUtils.renderBehaviorizedEventHandlersWithoutOnclick(facesContext, writer, output, behaviors); HtmlRendererUtils.renderBehaviorizedFieldEventHandlersWithoutOnchangeAndOnselect(facesContext, writer, output, behaviors); HtmlRendererUtils.renderHTMLAttributes(writer, output, HTML.ANCHOR_PASSTHROUGH_ATTRIBUTES_WITHOUT_STYLE_AND_EVENTS); HtmlRendererUtils.renderBehaviorizedAttribute(facesContext, writer, HTML.ONCLICK_ATTR, output, ClientBehaviorEvents.CLICK, null, behaviors, HTML.ONCLICK_ATTR, null, buildOnclickToggleFunction(facesContext, output)); } else { HtmlRendererUtils.renderHTMLAttributes(writer, output, HTML.ANCHOR_PASSTHROUGH_ATTRIBUTES_WITHOUT_ONCLICK_WITHOUT_STYLE); HtmlRendererUtils.renderHTMLAttribute(writer, HTML.ONCLICK_ATTR, HTML.ONCLICK_ATTR, buildOnclickToggleFunction(facesContext, output)); } HtmlRendererUtils.renderHTMLAttribute(writer, HTML.STYLE_ATTR, HTML.STYLE_ATTR, output.getAttributes().get(HTML.STYLE_ATTR)); HtmlRendererUtils.renderHTMLAttribute(writer, HTML.STYLE_CLASS_ATTR, HTML.STYLE_CLASS_ATTR, output.getAttributes().get(HTML.STYLE_CLASS_ATTR)); writer.flush(); } protected void renderOutputLinkEnd(FacesContext facesContext, UIComponent component) throws IOException { ResponseWriter writer = facesContext.getResponseWriter(); // force separate end tag writer.writeText("", null); writer.endElement(HTML.ANCHOR_ELEM); } private String buildOnclickToggleFunction(FacesContext facesContext, UIOutput output) throws IOException { ToggleLink toggleLink = (ToggleLink) output; TogglePanel togglePanel = getParentTogglePanel(facesContext, toggleLink); String[] componentsToToggle = toggleLink.getFor().split(","); String idsToHide = getIdsToHide(facesContext, togglePanel); StringBuffer idsToShow = new StringBuffer(); for (int i = 0; i < componentsToToggle.length; i++) { String componentId = componentsToToggle[i].trim(); UIComponent componentToShow = toggleLink.findComponent(componentId); if (componentToShow == null) { Log log = LogFactory.getLog(ToggleLinkRenderer.class); log.error("Unable to find component with id " + componentId); continue; } if (idsToShow.length() > 0) idsToShow.append(','); idsToShow.append(componentToShow.getClientId(facesContext)); } String outputOnclick = toggleLink.getOnclick(); StringBuffer onClick = new StringBuffer(); if (outputOnclick != null) { onClick.append("var cf = function(){"); onClick.append(outputOnclick); onClick.append('}'); onClick.append(';'); onClick.append("var oamSF = function(){"); } String onClickFocusClientId = toggleLink.getOnClickFocusId() != null ? toggleLink.findComponent(toggleLink.getOnClickFocusId()).getClientId(facesContext) : ""; onClick.append(getToggleJavascriptFunctionName(facesContext, toggleLink) + "('" + idsToShow + "','" + idsToHide + "','" + getHiddenFieldId(facesContext, togglePanel) + "','" + onClickFocusClientId + "');"); if (outputOnclick != null) { onClick.append('}'); onClick.append(';'); onClick.append("return (cf()==false)? false : oamSF();"); } return onClick.toString(); } public void encodeEnd(FacesContext context, UIComponent component) throws IOException { RendererUtils.checkParamValidity(context, component, ToggleLink.class); ToggleLink toggleLink = (ToggleLink) component; if (isDisabled(context, toggleLink)) return; super.encodeEnd(context, component); } public void encodeBegin(FacesContext context, UIComponent component) throws IOException { RendererUtils.checkParamValidity(context, component, ToggleLink.class); ToggleLink toggleLink = (ToggleLink) component; if (isDisabled(context, toggleLink)) return; super.encodeBegin(context, component); } private String getToggleJavascriptFunctionName(FacesContext context, ToggleLink toggleLink) { for (UIComponent component = toggleLink.getParent(); component != null; component = component.getParent()) if (component instanceof TogglePanel) return TogglePanelRenderer.getToggleJavascriptFunctionName(context, (TogglePanel) component); Log log = LogFactory.getLog(ToggleLinkRenderer.class); log.error("The ToggleLink component with id " + toggleLink.getClientId(context) + " isn't enclosed in a togglePanel."); return null; } private String getIdsToHide(FacesContext facesContext, TogglePanel togglePanel) { StringBuffer idsToHide = new StringBuffer(); int idsToHideCount = 0; for (Iterator it = togglePanel.getChildren().iterator(); it.hasNext();) { UIComponent component = (UIComponent) it.next(); if (TogglePanelRenderer.isHiddenWhenToggled(component)) { if (idsToHideCount > 0) idsToHide.append(','); idsToHide.append(component.getClientId(facesContext)); idsToHideCount++; } } return idsToHide.toString(); } private TogglePanel getParentTogglePanel(FacesContext facesContext, ToggleLink toggleLink) { for (UIComponent component = toggleLink.getParent(); component != null; component = component.getParent()) { if (component instanceof TogglePanel) return (TogglePanel) component; } return null; } private String getHiddenFieldId(FacesContext context, TogglePanel togglePanel) { return togglePanel.getClientId(context) + "_hidden"; } private boolean isDisabled(FacesContext facesContext, ToggleLink link) { TogglePanel panel = getParentTogglePanel(facesContext, link); return panel.isDisabled() || link.isDisabled() || !UserRoleUtils.isEnabledOnUserRole(link); } }