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

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        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be distributed under the terms of the Q Public License
    ** as defined by Trolltech AS of Norway and appearing in the file
    ** LICENSE.QPL included in the packaging of this file.
    **
    ** This file may be distributed and/or modified under the terms of the
    ** GNU General Public License version 2 as published by the Free Software
    ** Foundation and appearing in the file LICENSE.GPL included in the
    ** packaging of this file.
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    **   information about Qt Commercial License Agreements.
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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;
        }