/**
* OLAT - Online Learning and Training<br>
* http://www.olat.org
* <p>
* Licensed under the Apache License, Version 2.0 (the "License"); <br>
* you may not use this file except in compliance with the License.<br>
* You may obtain a copy of the License at
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* Unless required by applicable law or agreed to in writing,<br>
* software distributed under the License is distributed on an "AS IS" BASIS, <br>
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. <br>
* See the License for the specific language governing permissions and <br>
* limitations under the License.
* <p>
* Copyright (c) 1999-2006 at Multimedia- & E-Learning Services (MELS),<br>
* University of Zurich, Switzerland.
* <p>
*/
package org.olat.core.gui.components.tree;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.lang.StringEscapeUtils;
import org.olat.core.gui.GUIInterna;
import org.olat.core.gui.components.Component;
import org.olat.core.gui.components.ComponentRenderer;
import org.olat.core.gui.control.winmgr.AJAXFlags;
import org.olat.core.gui.render.RenderResult;
import org.olat.core.gui.render.Renderer;
import org.olat.core.gui.render.RenderingState;
import org.olat.core.gui.render.StringOutput;
import org.olat.core.gui.render.URLBuilder;
import org.olat.core.gui.translator.Translator;
import org.olat.core.util.nodes.INode;
/**
* enclosing_type Description: <br>
*
* @author Felix Jost
*/
public class MenuTreeScreenreaderRenderer implements ComponentRenderer {
/**
* Constructor for TableRenderer. Singleton and must be reentrant There must
* be an empty contructor for the Class.forName() call
*/
public MenuTreeScreenreaderRenderer() {
super();
}
/**
* @see org.olat.core.gui.render.ui.ComponentRenderer#render(org.olat.core.gui.render.Renderer,
* org.olat.core.gui.render.StringOutput, org.olat.core.gui.components.Component,
* org.olat.core.gui.render.URLBuilder, org.olat.core.gui.translator.Translator,
* org.olat.core.gui.render.RenderResult, java.lang.String[])
*/
public void render(Renderer renderer, StringOutput target, Component source, URLBuilder ubu, Translator translator,
RenderResult renderResult, String[] args) {
MenuTree tree = (MenuTree) source;
String compPrefix = renderer.getComponentPrefix(tree);
INode selNode = tree.getSelectedNode();
TreeNode root = tree.getTreeModel().getRootNode();
if (root == null) return; // tree is completely empty
List selPath = new ArrayList(5);
INode cur = selNode;
if (cur == null) cur = root; // if no selection, select the first node to
// expand the children
// add all elems from selected path to reversed list -> first elem is
// selected nodeid of the root node
while (cur != null) {
selPath.add(0, cur);
cur = cur.getParent();
}
// render overview information for screenreaders
if (tree.isDirtyForUser() && selNode != null) {
// this is the case when a new subtree expanded (parent is the node we just clicked).
// print out the children so that screenreaders know what has changed.
int cnt = selNode.getChildCount();
// brasato:: fix it
//Translator comptrans = tree.getCompTrans();
//target.append(comptrans.translate("sr.intro", new String[] {String.valueOf(cnt)}));
for (int i = 0; i < cnt; i++) {
TreeNode tn = (TreeNode) selNode.getChildAt(i);
StringOutput so = new StringOutput();
so.append("<a href=\"");
ubu.buildURI(so, new String[] { MenuTree.NODE_IDENT }, new String[] { tn.getIdent() });
so.append("\" title=\"").append(StringEscapeUtils.escapeHtml(tn.getAltText())).append("\">").append(tn.getTitle()).append("</a>");
//target.append(comptrans.translate("sr.treenode", new String[] {so.toString(), tn.getAltText()}));
}
//target.append(comptrans.translate("sr.endintro"));
}
renderLevel(target, 0, root, selPath, ubu, renderer.getGlobalSettings().getAjaxFlags(), compPrefix, tree.markingTreeNode);
}
/**
* @param target
*/
private void renderLevel(StringOutput target, int level, TreeNode curRoot, List selPath, URLBuilder ubu, AJAXFlags flags, String componentPrefix, TreeNode markedNode) {
INode curSel = null;
if (level < selPath.size()) {
curSel = (INode) selPath.get(level);
}
target.append("<ul><li>");
String title = curRoot.getTitle();
title = StringEscapeUtils.escapeHtml(title).toString();
if (curSel == curRoot && level == selPath.size() -1) {
target.append("X ");
}
target.append("<a onclick=\"return o2cl()\" href=\"");
boolean iframePostEnabled = flags.isIframePostEnabled();
if (GUIInterna.isLoadPerformanceMode()) {
// if in load perf test -> generate the treeposition and include it as param, since the nodeid itself is random and thus not replayable
StringBuilder conPath = new StringBuilder();
// we need at least one char in the var, even if we click the root node
conPath.append('!');
TreeNode cur = curRoot;
TreeNode par = (TreeNode) cur.getParent();
while (par != null) {
int cpos = cur.getPosition();
conPath.append(cpos).append('!');
cur = par;
par = (TreeNode) cur.getParent();
}
ubu.buildURI(target, new String[] { "en" }, new String[] { conPath.toString() });
} else {
if (iframePostEnabled) {
ubu.buildURI(target, new String[] { MenuTree.NODE_IDENT }, new String[] { curRoot.getIdent() }, AJAXFlags.MODE_TOBGIFRAME);
} else {
ubu.buildURI(target, new String[] { MenuTree.NODE_IDENT }, new String[] { curRoot.getIdent() });
}
}
target.append("\" title=\"");
target.append(curRoot.getAltText() == null ? title : StringEscapeUtils.escapeHtml(curRoot.getAltText()).toString());
target.append("\"");
if (iframePostEnabled) {
ubu.appendTarget(target);
}
target.append(">");
target.append(title).append("</a>");
int chdCnt = curRoot.getChildCount();
if (curSel == curRoot) {
// render children
for (int i = 0; i < chdCnt; i++) {
TreeNode curChd = (TreeNode) curRoot.getChildAt(i);
renderLevel(target, level + 1, curChd, selPath, ubu, flags, componentPrefix, markedNode);
}
}
// close item level
target.append("</li></ul>");
}
/**
* @see org.olat.core.gui.render.ui.ComponentRenderer#renderHeaderIncludes(org.olat.core.gui.render.Renderer,
* org.olat.core.gui.render.StringOutput, org.olat.core.gui.components.Component,
* org.olat.core.gui.render.URLBuilder, org.olat.core.gui.translator.Translator)
*/
public void renderHeaderIncludes(Renderer renderer, StringOutput sb, Component source, URLBuilder ubu, Translator translator, RenderingState rstate) {
//
}
/**
* @see org.olat.core.gui.render.ui.ComponentRenderer#renderBodyOnLoadJSFunctionCall(org.olat.core.gui.render.Renderer,
* org.olat.core.gui.render.StringOutput, org.olat.core.gui.components.Component)
*/
public void renderBodyOnLoadJSFunctionCall(Renderer renderer, StringOutput sb, Component source, RenderingState rstate) {
//
}
}