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

    /****************************************************************************
    **
    ** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
    **
    ** This file is part of the example classes of the Qt Toolkit.
    **
    ** Licensees holding valid Qt Preview licenses may use this file in
    ** accordance with the Qt Preview License Agreement provided with the
    ** Software.
    **
    ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
    ** information about Qt Commercial License Agreements.
    **
    ** Contact info@trolltech.com if any conditions of this licensing are
    ** not clear to you.
    **
    ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
    **
    ****************************************************************************/

    #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;
    }