Long live Qt!

1 files changed, 183 insertions, 0 deletions

diff --git a/doc/src/snippets/xml/rsslisting/handler.cpp b/doc/src/snippets/xml/rsslisting/handler.cpp
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+++ b/doc/src/snippets/xml/rsslisting/handler.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*
+handler.cpp
+
+Provides a handler for processing XML elements found by the reader.
+
+The handler looks for <title> and <link> elements within <item> elements,
+and records the text found within them. Link information stored within
+rdf:about attributes of <item> elements is also recorded when it is
+available.
+
+For each item found, a signal is emitted which specifies its title and
+link information. This may be used by user interfaces for the purpose of
+displaying items as they are read.
+*/
+
+#include <QtGui>
+
+#include "handler.h"
+
+/*
+    Reset the state of the handler to ensure that new documents are
+    read correctly.
+
+    We return true to indicate that parsing should continue.
+*/
+
+bool Handler::startDocument()
+{
+    inItem = false;
+    inTitle = false;
+    inLink = false;
+
+    return true;
+}
+
+/*
+    Process each starting element in the XML document.
+
+    Nested item, title, or link elements are not allowed, so we return false
+    if we encounter any of these. We also prohibit multiple definitions of
+    title strings.
+
+    Link destinations are read by this function if they are specified as
+    attributes in item elements.
+
+    For all cases not explicitly checked for, we return true to indicate that
+    the element is acceptable, and that parsing should continue. By doing
+    this, we can ignore elements in which we are not interested.
+*/
+
+bool Handler::startElement(const QString &, const QString &,
+    const QString & qName, const QXmlAttributes &attr)
+{
+    if (qName == "item") {
+
+        if (inItem)
+            return false;
+        else {
+            inItem = true;
+            linkString = attr.value("rdf:about");
+        }
+    }
+    else if (qName == "title") {
+
+        if (inTitle)
+            return false;
+        else if (!titleString.isEmpty())
+            return false;
+        else if (inItem)
+            inTitle = true;
+    }
+    else if (qName == "link") {
+
+        if (inLink)
+            return false;
+        else if (inItem)
+            inLink = true;
+    }
+
+    return true;
+}
+
+/*
+    Process each ending element in the XML document.
+
+    For recognized elements, we reset flags to ensure that we can read new
+    instances of these elements. If we have read an item element, emit a
+    signal to indicate that a new item is available for display.
+
+    We return true to indicate that parsing should continue.
+*/
+
+bool Handler::endElement(const QString &, const QString &,
+    const QString & qName)
+{
+    if (qName == "title" && inTitle)
+        inTitle = false;
+    else if (qName == "link" && inLink)
+        inLink = false;
+    else if (qName == "item") {
+        if (!titleString.isEmpty() && !linkString.isEmpty())
+            emit newItem(titleString, linkString);
+        inItem = false;
+        titleString = "";
+        linkString = "";
+    }
+
+    return true;
+}
+
+/*
+    Collect characters when reading the contents of title or link elements
+    when they occur within an item element.
+
+    We return true to indicate that parsing should continue.
+*/
+
+bool Handler::characters (const QString &chars)
+{
+    if (inTitle)
+        titleString += chars;
+    else if (inLink)
+        linkString += chars;
+
+    return true;
+}
+
+/*
+    Report a fatal parsing error, and return false to indicate to the reader
+    that parsing should stop.
+*/
+
+//! [0]
+bool Handler::fatalError (const QXmlParseException & exception)
+{
+    qWarning() << "Fatal error on line" << exception.lineNumber()
+               << ", column" << exception.columnNumber() << ":"
+               << exception.message();
+
+    return false;
+}
+//! [0]