- Qt 5.5
- Qt XML
- SAX Bookmarks Example
- xbelhandler.cpp Example File
- Qt 5.5.1 Reference Documentation

# xbelhandler.cpp Example File

saxbookmarks/xbelhandler.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
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    ** modification, are permitted provided that the following conditions are
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    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
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    #include <QtWidgets>

    #include "xbelhandler.h"

    XbelHandler::XbelHandler(QTreeWidget *treeWidget)
        : treeWidget(treeWidget)
    {
        item = 0;
        metXbelTag = false;

        QStyle *style = treeWidget->style();

        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 XbelHandler::startElement(const QString & /* namespaceURI */,
                                   const QString & /* localName */,
                                   const QString &qName,
                                   const QXmlAttributes &attributes)
    {
        if (!metXbelTag && qName != "xbel") {
            errorStr = QObject::tr("The file is not an XBEL file.");
            return false;
        }

        if (qName == "xbel") {
            QString version = attributes.value("version");
            if (!version.isEmpty() && version != "1.0") {
                errorStr = QObject::tr("The file is not an XBEL version 1.0 file.");
                return false;
            }
            metXbelTag = true;
        } else if (qName == "folder") {
            item = createChildItem(qName);
            item->setFlags(item->flags() | Qt::ItemIsEditable);
            item->setIcon(0, folderIcon);
            item->setText(0, QObject::tr("Folder"));
            bool folded = (attributes.value("folded") != "no");
            treeWidget->setItemExpanded(item, !folded);
        } else if (qName == "bookmark") {
            item = createChildItem(qName);
            item->setFlags(item->flags() | Qt::ItemIsEditable);
            item->setIcon(0, bookmarkIcon);
            item->setText(0, QObject::tr("Unknown title"));
            item->setText(1, attributes.value("href"));
        } else if (qName == "separator") {
            item = createChildItem(qName);
            item->setFlags(item->flags() & ~Qt::ItemIsSelectable);
            item->setText(0, QString(30, 0xB7));
        }

        currentText.clear();
        return true;
    }

    bool XbelHandler::endElement(const QString & /* namespaceURI */,
                                 const QString & /* localName */,
                                 const QString &qName)
    {
        if (qName == "title") {
            if (item)
                item->setText(0, currentText);
        } else if (qName == "folder" || qName == "bookmark"
                   || qName == "separator") {
            item = item->parent();
        }
        return true;
    }

    bool XbelHandler::characters(const QString &str)
    {
        currentText += str;
        return true;
    }

    bool XbelHandler::fatalError(const QXmlParseException &exception)
    {
        QMessageBox::information(treeWidget->window(), QObject::tr("SAX Bookmarks"),
                                 QObject::tr("Parse error at line %1, column %2:\n"
                                             "%3")
                                 .arg(exception.lineNumber())
                                 .arg(exception.columnNumber())
                                 .arg(exception.message()));
        return false;
    }

    QString XbelHandler::errorString() const
    {
        return errorStr;
    }

    QTreeWidgetItem *XbelHandler::createChildItem(const QString &tagName)
    {
        QTreeWidgetItem *childItem;
        if (item) {
            childItem = new QTreeWidgetItem(item);
        } else {
            childItem = new QTreeWidgetItem(treeWidget);
        }
        childItem->setData(0, Qt::UserRole, tagName);
        return childItem;
    }