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# xbeltree.cpp Example File
xml/dombookmarks/xbeltree.cpp

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     #include <QtGui>

     #include "xbeltree.h"

     XbelTree::XbelTree(QWidget *parent)
         : QTreeWidget(parent)
     {
         QStringList labels;
         labels << tr("Title") << tr("Location");

         header()->setResizeMode(QHeaderView::Stretch);
         setHeaderLabels(labels);

         folderIcon.addPixmap(style()->standardPixmap(QStyle::SP_DirClosedIcon),
                              QIcon::Normal, QIcon::Off);
         folderIcon.addPixmap(style()->standardPixmap(QStyle::SP_DirOpenIcon),
                              QIcon::Normal, QIcon::On);
         bookmarkIcon.addPixmap(style()->standardPixmap(QStyle::SP_FileIcon));
     }

     bool XbelTree::read(QIODevice *device)
     {
         QString errorStr;
         int errorLine;
         int errorColumn;

         if (!domDocument.setContent(device, true, &errorStr, &errorLine,
                                     &errorColumn)) {
             QMessageBox::information(window(), tr("DOM Bookmarks"),
                                      tr("Parse error at line %1, column %2:\n%3")
                                      .arg(errorLine)
                                      .arg(errorColumn)
                                      .arg(errorStr));
             return false;
         }

         QDomElement root = domDocument.documentElement();
         if (root.tagName() != "xbel") {
             QMessageBox::information(window(), tr("DOM Bookmarks"),
                                      tr("The file is not an XBEL file."));
             return false;
         } else if (root.hasAttribute("version")
                    && root.attribute("version") != "1.0") {
             QMessageBox::information(window(), tr("DOM Bookmarks"),
                                      tr("The file is not an XBEL version 1.0 "
                                         "file."));
             return false;
         }

         clear();

         disconnect(this, SIGNAL(itemChanged(QTreeWidgetItem *, int)),
                    this, SLOT(updateDomElement(QTreeWidgetItem *, int)));

         QDomElement child = root.firstChildElement("folder");
         while (!child.isNull()) {
             parseFolderElement(child);
             child = child.nextSiblingElement("folder");
         }

         connect(this, SIGNAL(itemChanged(QTreeWidgetItem *, int)),
                 this, SLOT(updateDomElement(QTreeWidgetItem *, int)));

         return true;
     }

     bool XbelTree::write(QIODevice *device)
     {
         const int IndentSize = 4;

         QTextStream out(device);
         domDocument.save(out, IndentSize);
         return true;
     }

     void XbelTree::updateDomElement(QTreeWidgetItem *item, int column)
     {
         QDomElement element = domElementForItem.value(item);
         if (!element.isNull()) {
             if (column == 0) {
                 QDomElement oldTitleElement = element.firstChildElement("title");
                 QDomElement newTitleElement = domDocument.createElement("title");

                 QDomText newTitleText = domDocument.createTextNode(item->text(0));
                 newTitleElement.appendChild(newTitleText);

                 element.replaceChild(newTitleElement, oldTitleElement);
             } else {
                 if (element.tagName() == "bookmark")
                     element.setAttribute("href", item->text(1));
             }
         }
     }

     void XbelTree::parseFolderElement(const QDomElement &element,
                                       QTreeWidgetItem *parentItem)
     {
         QTreeWidgetItem *item = createItem(element, parentItem);

         QString title = element.firstChildElement("title").text();
         if (title.isEmpty())
             title = QObject::tr("Folder");

         item->setFlags(item->flags() | Qt::ItemIsEditable);
         item->setIcon(0, folderIcon);
         item->setText(0, title);

         bool folded = (element.attribute("folded") != "no");
         setItemExpanded(item, !folded);

         QDomElement child = element.firstChildElement();
         while (!child.isNull()) {
             if (child.tagName() == "folder") {
                 parseFolderElement(child, item);
             } else if (child.tagName() == "bookmark") {
                 QTreeWidgetItem *childItem = createItem(child, item);

                 QString title = child.firstChildElement("title").text();
                 if (title.isEmpty())
                     title = QObject::tr("Folder");

                 childItem->setFlags(item->flags() | Qt::ItemIsEditable);
                 childItem->setIcon(0, bookmarkIcon);
                 childItem->setText(0, title);
                 childItem->setText(1, child.attribute("href"));
             } else if (child.tagName() == "separator") {
                 QTreeWidgetItem *childItem = createItem(child, item);
                 childItem->setFlags(item->flags() & ~(Qt::ItemIsSelectable | Qt::ItemIsEditable));
                 childItem->setText(0, QString(30, 0xB7));
             }
             child = child.nextSiblingElement();
         }
     }

     QTreeWidgetItem *XbelTree::createItem(const QDomElement &element,
                                           QTreeWidgetItem *parentItem)
     {
         QTreeWidgetItem *item;
         if (parentItem) {
             item = new QTreeWidgetItem(parentItem);
         } else {
             item = new QTreeWidgetItem(this);
         }
         domElementForItem.insert(item, element);
         return item;
     }